drm/i915: Extract skl_watermark.c

Pull all the skl+ watermark code (and the dbuf/sagv/ipc code
since it's all sort of intertwined and I'm too lazy to think
of a finer grained split right now) into its own file from the
catch-all intel_pm.c.

Also sneak in the s/dev_priv/i915/ rename while at it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220908191646.20239-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 3470 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
new file mode 100644
index 000000000000..25ca92ae8958
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -0,0 +1,3470 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include <drm/drm_blend.h>
+
+#include "intel_atomic.h"
+#include "intel_atomic_plane.h"
+#include "intel_bw.h"
+#include "intel_de.h"
+#include "intel_display.h"
+#include "intel_display_power.h"
+#include "intel_display_types.h"
+#include "intel_fb.h"
+#include "skl_watermark.h"
+
+#include "i915_drv.h"
+#include "i915_fixed.h"
+#include "i915_reg.h"
+#include "intel_pcode.h"
+#include "intel_pm.h"
+
+static void skl_sagv_disable(struct drm_i915_private *i915);
+
+/* Stores plane specific WM parameters */
+struct skl_wm_params {
+	bool x_tiled, y_tiled;
+	bool rc_surface;
+	bool is_planar;
+	u32 width;
+	u8 cpp;
+	u32 plane_pixel_rate;
+	u32 y_min_scanlines;
+	u32 plane_bytes_per_line;
+	uint_fixed_16_16_t plane_blocks_per_line;
+	uint_fixed_16_16_t y_tile_minimum;
+	u32 linetime_us;
+	u32 dbuf_block_size;
+};
+
+u8 intel_enabled_dbuf_slices_mask(struct drm_i915_private *i915)
+{
+	u8 enabled_slices = 0;
+	enum dbuf_slice slice;
+
+	for_each_dbuf_slice(i915, slice) {
+		if (intel_uncore_read(&i915->uncore,
+				      DBUF_CTL_S(slice)) & DBUF_POWER_STATE)
+			enabled_slices |= BIT(slice);
+	}
+
+	return enabled_slices;
+}
+
+/*
+ * FIXME: We still don't have the proper code detect if we need to apply the WA,
+ * so assume we'll always need it in order to avoid underruns.
+ */
+static bool skl_needs_memory_bw_wa(struct drm_i915_private *i915)
+{
+	return DISPLAY_VER(i915) == 9;
+}
+
+static bool
+intel_has_sagv(struct drm_i915_private *i915)
+{
+	return DISPLAY_VER(i915) >= 9 && !IS_LP(i915) &&
+		i915->display.sagv.status != I915_SAGV_NOT_CONTROLLED;
+}
+
+static u32
+intel_sagv_block_time(struct drm_i915_private *i915)
+{
+	if (DISPLAY_VER(i915) >= 12) {
+		u32 val = 0;
+		int ret;
+
+		ret = snb_pcode_read(&i915->uncore,
+				     GEN12_PCODE_READ_SAGV_BLOCK_TIME_US,
+				     &val, NULL);
+		if (ret) {
+			drm_dbg_kms(&i915->drm, "Couldn't read SAGV block time!\n");
+			return 0;
+		}
+
+		return val;
+	} else if (DISPLAY_VER(i915) == 11) {
+		return 10;
+	} else if (DISPLAY_VER(i915) == 9 && !IS_LP(i915)) {
+		return 30;
+	} else {
+		return 0;
+	}
+}
+
+static void intel_sagv_init(struct drm_i915_private *i915)
+{
+	if (!intel_has_sagv(i915))
+		i915->display.sagv.status = I915_SAGV_NOT_CONTROLLED;
+
+	/*
+	 * Probe to see if we have working SAGV control.
+	 * For icl+ this was already determined by intel_bw_init_hw().
+	 */
+	if (DISPLAY_VER(i915) < 11)
+		skl_sagv_disable(i915);
+
+	drm_WARN_ON(&i915->drm, i915->display.sagv.status == I915_SAGV_UNKNOWN);
+
+	i915->display.sagv.block_time_us = intel_sagv_block_time(i915);
+
+	drm_dbg_kms(&i915->drm, "SAGV supported: %s, original SAGV block time: %u us\n",
+		    str_yes_no(intel_has_sagv(i915)), i915->display.sagv.block_time_us);
+
+	/* avoid overflow when adding with wm0 latency/etc. */
+	if (drm_WARN(&i915->drm, i915->display.sagv.block_time_us > U16_MAX,
+		     "Excessive SAGV block time %u, ignoring\n",
+		     i915->display.sagv.block_time_us))
+		i915->display.sagv.block_time_us = 0;
+
+	if (!intel_has_sagv(i915))
+		i915->display.sagv.block_time_us = 0;
+}
+
+/*
+ * SAGV dynamically adjusts the system agent voltage and clock frequencies
+ * depending on power and performance requirements. The display engine access
+ * to system memory is blocked during the adjustment time. Because of the
+ * blocking time, having this enabled can cause full system hangs and/or pipe
+ * underruns if we don't meet all of the following requirements:
+ *
+ *  - <= 1 pipe enabled
+ *  - All planes can enable watermarks for latencies >= SAGV engine block time
+ *  - We're not using an interlaced display configuration
+ */
+static void skl_sagv_enable(struct drm_i915_private *i915)
+{
+	int ret;
+
+	if (!intel_has_sagv(i915))
+		return;
+
+	if (i915->display.sagv.status == I915_SAGV_ENABLED)
+		return;
+
+	drm_dbg_kms(&i915->drm, "Enabling SAGV\n");
+	ret = snb_pcode_write(&i915->uncore, GEN9_PCODE_SAGV_CONTROL,
+			      GEN9_SAGV_ENABLE);
+
+	/* We don't need to wait for SAGV when enabling */
+
+	/*
+	 * Some skl systems, pre-release machines in particular,
+	 * don't actually have SAGV.
+	 */
+	if (IS_SKYLAKE(i915) && ret == -ENXIO) {
+		drm_dbg(&i915->drm, "No SAGV found on system, ignoring\n");
+		i915->display.sagv.status = I915_SAGV_NOT_CONTROLLED;
+		return;
+	} else if (ret < 0) {
+		drm_err(&i915->drm, "Failed to enable SAGV\n");
+		return;
+	}
+
+	i915->display.sagv.status = I915_SAGV_ENABLED;
+}
+
+static void skl_sagv_disable(struct drm_i915_private *i915)
+{
+	int ret;
+
+	if (!intel_has_sagv(i915))
+		return;
+
+	if (i915->display.sagv.status == I915_SAGV_DISABLED)
+		return;
+
+	drm_dbg_kms(&i915->drm, "Disabling SAGV\n");
+	/* bspec says to keep retrying for at least 1 ms */
+	ret = skl_pcode_request(&i915->uncore, GEN9_PCODE_SAGV_CONTROL,
+				GEN9_SAGV_DISABLE,
+				GEN9_SAGV_IS_DISABLED, GEN9_SAGV_IS_DISABLED,
+				1);
+	/*
+	 * Some skl systems, pre-release machines in particular,
+	 * don't actually have SAGV.
+	 */
+	if (IS_SKYLAKE(i915) && ret == -ENXIO) {
+		drm_dbg(&i915->drm, "No SAGV found on system, ignoring\n");
+		i915->display.sagv.status = I915_SAGV_NOT_CONTROLLED;
+		return;
+	} else if (ret < 0) {
+		drm_err(&i915->drm, "Failed to disable SAGV (%d)\n", ret);
+		return;
+	}
+
+	i915->display.sagv.status = I915_SAGV_DISABLED;
+}
+
+static void skl_sagv_pre_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_bw_state *new_bw_state =
+		intel_atomic_get_new_bw_state(state);
+
+	if (!new_bw_state)
+		return;
+
+	if (!intel_can_enable_sagv(i915, new_bw_state))
+		skl_sagv_disable(i915);
+}
+
+static void skl_sagv_post_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_bw_state *new_bw_state =
+		intel_atomic_get_new_bw_state(state);
+
+	if (!new_bw_state)
+		return;
+
+	if (intel_can_enable_sagv(i915, new_bw_state))
+		skl_sagv_enable(i915);
+}
+
+static void icl_sagv_pre_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_bw_state *old_bw_state =
+		intel_atomic_get_old_bw_state(state);
+	const struct intel_bw_state *new_bw_state =
+		intel_atomic_get_new_bw_state(state);
+	u16 old_mask, new_mask;
+
+	if (!new_bw_state)
+		return;
+
+	old_mask = old_bw_state->qgv_points_mask;
+	new_mask = old_bw_state->qgv_points_mask | new_bw_state->qgv_points_mask;
+
+	if (old_mask == new_mask)
+		return;
+
+	WARN_ON(!new_bw_state->base.changed);
+
+	drm_dbg_kms(&i915->drm, "Restricting QGV points: 0x%x -> 0x%x\n",
+		    old_mask, new_mask);
+
+	/*
+	 * Restrict required qgv points before updating the configuration.
+	 * According to BSpec we can't mask and unmask qgv points at the same
+	 * time. Also masking should be done before updating the configuration
+	 * and unmasking afterwards.
+	 */
+	icl_pcode_restrict_qgv_points(i915, new_mask);
+}
+
+static void icl_sagv_post_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_bw_state *old_bw_state =
+		intel_atomic_get_old_bw_state(state);
+	const struct intel_bw_state *new_bw_state =
+		intel_atomic_get_new_bw_state(state);
+	u16 old_mask, new_mask;
+
+	if (!new_bw_state)
+		return;
+
+	old_mask = old_bw_state->qgv_points_mask | new_bw_state->qgv_points_mask;
+	new_mask = new_bw_state->qgv_points_mask;
+
+	if (old_mask == new_mask)
+		return;
+
+	WARN_ON(!new_bw_state->base.changed);
+
+	drm_dbg_kms(&i915->drm, "Relaxing QGV points: 0x%x -> 0x%x\n",
+		    old_mask, new_mask);
+
+	/*
+	 * Allow required qgv points after updating the configuration.
+	 * According to BSpec we can't mask and unmask qgv points at the same
+	 * time. Also masking should be done before updating the configuration
+	 * and unmasking afterwards.
+	 */
+	icl_pcode_restrict_qgv_points(i915, new_mask);
+}
+
+void intel_sagv_pre_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+
+	/*
+	 * Just return if we can't control SAGV or don't have it.
+	 * This is different from situation when we have SAGV but just can't
+	 * afford it due to DBuf limitation - in case if SAGV is completely
+	 * disabled in a BIOS, we are not even allowed to send a PCode request,
+	 * as it will throw an error. So have to check it here.
+	 */
+	if (!intel_has_sagv(i915))
+		return;
+
+	if (DISPLAY_VER(i915) >= 11)
+		icl_sagv_pre_plane_update(state);
+	else
+		skl_sagv_pre_plane_update(state);
+}
+
+void intel_sagv_post_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+
+	/*
+	 * Just return if we can't control SAGV or don't have it.
+	 * This is different from situation when we have SAGV but just can't
+	 * afford it due to DBuf limitation - in case if SAGV is completely
+	 * disabled in a BIOS, we are not even allowed to send a PCode request,
+	 * as it will throw an error. So have to check it here.
+	 */
+	if (!intel_has_sagv(i915))
+		return;
+
+	if (DISPLAY_VER(i915) >= 11)
+		icl_sagv_post_plane_update(state);
+	else
+		skl_sagv_post_plane_update(state);
+}
+
+static bool skl_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	enum plane_id plane_id;
+	int max_level = INT_MAX;
+
+	if (!intel_has_sagv(i915))
+		return false;
+
+	if (!crtc_state->hw.active)
+		return true;
+
+	if (crtc_state->hw.pipe_mode.flags & DRM_MODE_FLAG_INTERLACE)
+		return false;
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		const struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+		int level;
+
+		/* Skip this plane if it's not enabled */
+		if (!wm->wm[0].enable)
+			continue;
+
+		/* Find the highest enabled wm level for this plane */
+		for (level = ilk_wm_max_level(i915);
+		     !wm->wm[level].enable; --level)
+		     { }
+
+		/* Highest common enabled wm level for all planes */
+		max_level = min(level, max_level);
+	}
+
+	/* No enabled planes? */
+	if (max_level == INT_MAX)
+		return true;
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		const struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+
+		/*
+		 * All enabled planes must have enabled a common wm level that
+		 * can tolerate memory latencies higher than sagv_block_time_us
+		 */
+		if (wm->wm[0].enable && !wm->wm[max_level].can_sagv)
+			return false;
+	}
+
+	return true;
+}
+
+static bool tgl_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	enum plane_id plane_id;
+
+	if (!crtc_state->hw.active)
+		return true;
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		const struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+
+		if (wm->wm[0].enable && !wm->sagv.wm0.enable)
+			return false;
+	}
+
+	return true;
+}
+
+static bool intel_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+
+	if (DISPLAY_VER(i915) >= 12)
+		return tgl_crtc_can_enable_sagv(crtc_state);
+	else
+		return skl_crtc_can_enable_sagv(crtc_state);
+}
+
+bool intel_can_enable_sagv(struct drm_i915_private *i915,
+			   const struct intel_bw_state *bw_state)
+{
+	if (DISPLAY_VER(i915) < 11 &&
+	    bw_state->active_pipes && !is_power_of_2(bw_state->active_pipes))
+		return false;
+
+	return bw_state->pipe_sagv_reject == 0;
+}
+
+static int intel_compute_sagv_mask(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	int ret;
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_bw_state *new_bw_state = NULL;
+	const struct intel_bw_state *old_bw_state = NULL;
+	int i;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					 new_crtc_state, i) {
+		new_bw_state = intel_atomic_get_bw_state(state);
+		if (IS_ERR(new_bw_state))
+			return PTR_ERR(new_bw_state);
+
+		old_bw_state = intel_atomic_get_old_bw_state(state);
+
+		if (intel_crtc_can_enable_sagv(new_crtc_state))
+			new_bw_state->pipe_sagv_reject &= ~BIT(crtc->pipe);
+		else
+			new_bw_state->pipe_sagv_reject |= BIT(crtc->pipe);
+	}
+
+	if (!new_bw_state)
+		return 0;
+
+	new_bw_state->active_pipes =
+		intel_calc_active_pipes(state, old_bw_state->active_pipes);
+
+	if (new_bw_state->active_pipes != old_bw_state->active_pipes) {
+		ret = intel_atomic_lock_global_state(&new_bw_state->base);
+		if (ret)
+			return ret;
+	}
+
+	if (intel_can_enable_sagv(i915, new_bw_state) !=
+	    intel_can_enable_sagv(i915, old_bw_state)) {
+		ret = intel_atomic_serialize_global_state(&new_bw_state->base);
+		if (ret)
+			return ret;
+	} else if (new_bw_state->pipe_sagv_reject != old_bw_state->pipe_sagv_reject) {
+		ret = intel_atomic_lock_global_state(&new_bw_state->base);
+		if (ret)
+			return ret;
+	}
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					 new_crtc_state, i) {
+		struct skl_pipe_wm *pipe_wm = &new_crtc_state->wm.skl.optimal;
+
+		/*
+		 * We store use_sagv_wm in the crtc state rather than relying on
+		 * that bw state since we have no convenient way to get at the
+		 * latter from the plane commit hooks (especially in the legacy
+		 * cursor case)
+		 */
+		pipe_wm->use_sagv_wm = !HAS_HW_SAGV_WM(i915) &&
+			DISPLAY_VER(i915) >= 12 &&
+			intel_can_enable_sagv(i915, new_bw_state);
+	}
+
+	return 0;
+}
+
+static u16 skl_ddb_entry_init(struct skl_ddb_entry *entry,
+			      u16 start, u16 end)
+{
+	entry->start = start;
+	entry->end = end;
+
+	return end;
+}
+
+static int intel_dbuf_slice_size(struct drm_i915_private *i915)
+{
+	return INTEL_INFO(i915)->display.dbuf.size /
+		hweight8(INTEL_INFO(i915)->display.dbuf.slice_mask);
+}
+
+static void
+skl_ddb_entry_for_slices(struct drm_i915_private *i915, u8 slice_mask,
+			 struct skl_ddb_entry *ddb)
+{
+	int slice_size = intel_dbuf_slice_size(i915);
+
+	if (!slice_mask) {
+		ddb->start = 0;
+		ddb->end = 0;
+		return;
+	}
+
+	ddb->start = (ffs(slice_mask) - 1) * slice_size;
+	ddb->end = fls(slice_mask) * slice_size;
+
+	WARN_ON(ddb->start >= ddb->end);
+	WARN_ON(ddb->end > INTEL_INFO(i915)->display.dbuf.size);
+}
+
+static unsigned int mbus_ddb_offset(struct drm_i915_private *i915, u8 slice_mask)
+{
+	struct skl_ddb_entry ddb;
+
+	if (slice_mask & (BIT(DBUF_S1) | BIT(DBUF_S2)))
+		slice_mask = BIT(DBUF_S1);
+	else if (slice_mask & (BIT(DBUF_S3) | BIT(DBUF_S4)))
+		slice_mask = BIT(DBUF_S3);
+
+	skl_ddb_entry_for_slices(i915, slice_mask, &ddb);
+
+	return ddb.start;
+}
+
+u32 skl_ddb_dbuf_slice_mask(struct drm_i915_private *i915,
+			    const struct skl_ddb_entry *entry)
+{
+	int slice_size = intel_dbuf_slice_size(i915);
+	enum dbuf_slice start_slice, end_slice;
+	u8 slice_mask = 0;
+
+	if (!skl_ddb_entry_size(entry))
+		return 0;
+
+	start_slice = entry->start / slice_size;
+	end_slice = (entry->end - 1) / slice_size;
+
+	/*
+	 * Per plane DDB entry can in a really worst case be on multiple slices
+	 * but single entry is anyway contigious.
+	 */
+	while (start_slice <= end_slice) {
+		slice_mask |= BIT(start_slice);
+		start_slice++;
+	}
+
+	return slice_mask;
+}
+
+static unsigned int intel_crtc_ddb_weight(const struct intel_crtc_state *crtc_state)
+{
+	const struct drm_display_mode *pipe_mode = &crtc_state->hw.pipe_mode;
+	int hdisplay, vdisplay;
+
+	if (!crtc_state->hw.active)
+		return 0;
+
+	/*
+	 * Watermark/ddb requirement highly depends upon width of the
+	 * framebuffer, So instead of allocating DDB equally among pipes
+	 * distribute DDB based on resolution/width of the display.
+	 */
+	drm_mode_get_hv_timing(pipe_mode, &hdisplay, &vdisplay);
+
+	return hdisplay;
+}
+
+static void intel_crtc_dbuf_weights(const struct intel_dbuf_state *dbuf_state,
+				    enum pipe for_pipe,
+				    unsigned int *weight_start,
+				    unsigned int *weight_end,
+				    unsigned int *weight_total)
+{
+	struct drm_i915_private *i915 =
+		to_i915(dbuf_state->base.state->base.dev);
+	enum pipe pipe;
+
+	*weight_start = 0;
+	*weight_end = 0;
+	*weight_total = 0;
+
+	for_each_pipe(i915, pipe) {
+		int weight = dbuf_state->weight[pipe];
+
+		/*
+		 * Do not account pipes using other slice sets
+		 * luckily as of current BSpec slice sets do not partially
+		 * intersect(pipes share either same one slice or same slice set
+		 * i.e no partial intersection), so it is enough to check for
+		 * equality for now.
+		 */
+		if (dbuf_state->slices[pipe] != dbuf_state->slices[for_pipe])
+			continue;
+
+		*weight_total += weight;
+		if (pipe < for_pipe) {
+			*weight_start += weight;
+			*weight_end += weight;
+		} else if (pipe == for_pipe) {
+			*weight_end += weight;
+		}
+	}
+}
+
+static int
+skl_crtc_allocate_ddb(struct intel_atomic_state *state, struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	unsigned int weight_total, weight_start, weight_end;
+	const struct intel_dbuf_state *old_dbuf_state =
+		intel_atomic_get_old_dbuf_state(state);
+	struct intel_dbuf_state *new_dbuf_state =
+		intel_atomic_get_new_dbuf_state(state);
+	struct intel_crtc_state *crtc_state;
+	struct skl_ddb_entry ddb_slices;
+	enum pipe pipe = crtc->pipe;
+	unsigned int mbus_offset = 0;
+	u32 ddb_range_size;
+	u32 dbuf_slice_mask;
+	u32 start, end;
+	int ret;
+
+	if (new_dbuf_state->weight[pipe] == 0) {
+		skl_ddb_entry_init(&new_dbuf_state->ddb[pipe], 0, 0);
+		goto out;
+	}
+
+	dbuf_slice_mask = new_dbuf_state->slices[pipe];
+
+	skl_ddb_entry_for_slices(i915, dbuf_slice_mask, &ddb_slices);
+	mbus_offset = mbus_ddb_offset(i915, dbuf_slice_mask);
+	ddb_range_size = skl_ddb_entry_size(&ddb_slices);
+
+	intel_crtc_dbuf_weights(new_dbuf_state, pipe,
+				&weight_start, &weight_end, &weight_total);
+
+	start = ddb_range_size * weight_start / weight_total;
+	end = ddb_range_size * weight_end / weight_total;
+
+	skl_ddb_entry_init(&new_dbuf_state->ddb[pipe],
+			   ddb_slices.start - mbus_offset + start,
+			   ddb_slices.start - mbus_offset + end);
+
+out:
+	if (old_dbuf_state->slices[pipe] == new_dbuf_state->slices[pipe] &&
+	    skl_ddb_entry_equal(&old_dbuf_state->ddb[pipe],
+				&new_dbuf_state->ddb[pipe]))
+		return 0;
+
+	ret = intel_atomic_lock_global_state(&new_dbuf_state->base);
+	if (ret)
+		return ret;
+
+	crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
+	/*
+	 * Used for checking overlaps, so we need absolute
+	 * offsets instead of MBUS relative offsets.
+	 */
+	crtc_state->wm.skl.ddb.start = mbus_offset + new_dbuf_state->ddb[pipe].start;
+	crtc_state->wm.skl.ddb.end = mbus_offset + new_dbuf_state->ddb[pipe].end;
+
+	drm_dbg_kms(&i915->drm,
+		    "[CRTC:%d:%s] dbuf slices 0x%x -> 0x%x, ddb (%d - %d) -> (%d - %d), active pipes 0x%x -> 0x%x\n",
+		    crtc->base.base.id, crtc->base.name,
+		    old_dbuf_state->slices[pipe], new_dbuf_state->slices[pipe],
+		    old_dbuf_state->ddb[pipe].start, old_dbuf_state->ddb[pipe].end,
+		    new_dbuf_state->ddb[pipe].start, new_dbuf_state->ddb[pipe].end,
+		    old_dbuf_state->active_pipes, new_dbuf_state->active_pipes);
+
+	return 0;
+}
+
+static int skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
+				 int width, const struct drm_format_info *format,
+				 u64 modifier, unsigned int rotation,
+				 u32 plane_pixel_rate, struct skl_wm_params *wp,
+				 int color_plane);
+
+static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
+				 struct intel_plane *plane,
+				 int level,
+				 unsigned int latency,
+				 const struct skl_wm_params *wp,
+				 const struct skl_wm_level *result_prev,
+				 struct skl_wm_level *result /* out */);
+
+static unsigned int
+skl_cursor_allocation(const struct intel_crtc_state *crtc_state,
+		      int num_active)
+{
+	struct intel_plane *plane = to_intel_plane(crtc_state->uapi.crtc->cursor);
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	int level, max_level = ilk_wm_max_level(i915);
+	struct skl_wm_level wm = {};
+	int ret, min_ddb_alloc = 0;
+	struct skl_wm_params wp;
+
+	ret = skl_compute_wm_params(crtc_state, 256,
+				    drm_format_info(DRM_FORMAT_ARGB8888),
+				    DRM_FORMAT_MOD_LINEAR,
+				    DRM_MODE_ROTATE_0,
+				    crtc_state->pixel_rate, &wp, 0);
+	drm_WARN_ON(&i915->drm, ret);
+
+	for (level = 0; level <= max_level; level++) {
+		unsigned int latency = i915->display.wm.skl_latency[level];
+
+		skl_compute_plane_wm(crtc_state, plane, level, latency, &wp, &wm, &wm);
+		if (wm.min_ddb_alloc == U16_MAX)
+			break;
+
+		min_ddb_alloc = wm.min_ddb_alloc;
+	}
+
+	return max(num_active == 1 ? 32 : 8, min_ddb_alloc);
+}
+
+static void skl_ddb_entry_init_from_hw(struct skl_ddb_entry *entry, u32 reg)
+{
+	skl_ddb_entry_init(entry,
+			   REG_FIELD_GET(PLANE_BUF_START_MASK, reg),
+			   REG_FIELD_GET(PLANE_BUF_END_MASK, reg));
+	if (entry->end)
+		entry->end++;
+}
+
+static void
+skl_ddb_get_hw_plane_state(struct drm_i915_private *i915,
+			   const enum pipe pipe,
+			   const enum plane_id plane_id,
+			   struct skl_ddb_entry *ddb,
+			   struct skl_ddb_entry *ddb_y)
+{
+	u32 val;
+
+	/* Cursor doesn't support NV12/planar, so no extra calculation needed */
+	if (plane_id == PLANE_CURSOR) {
+		val = intel_uncore_read(&i915->uncore, CUR_BUF_CFG(pipe));
+		skl_ddb_entry_init_from_hw(ddb, val);
+		return;
+	}
+
+	val = intel_uncore_read(&i915->uncore, PLANE_BUF_CFG(pipe, plane_id));
+	skl_ddb_entry_init_from_hw(ddb, val);
+
+	if (DISPLAY_VER(i915) >= 11)
+		return;
+
+	val = intel_uncore_read(&i915->uncore, PLANE_NV12_BUF_CFG(pipe, plane_id));
+	skl_ddb_entry_init_from_hw(ddb_y, val);
+}
+
+static void skl_pipe_ddb_get_hw_state(struct intel_crtc *crtc,
+				      struct skl_ddb_entry *ddb,
+				      struct skl_ddb_entry *ddb_y)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	enum intel_display_power_domain power_domain;
+	enum pipe pipe = crtc->pipe;
+	intel_wakeref_t wakeref;
+	enum plane_id plane_id;
+
+	power_domain = POWER_DOMAIN_PIPE(pipe);
+	wakeref = intel_display_power_get_if_enabled(i915, power_domain);
+	if (!wakeref)
+		return;
+
+	for_each_plane_id_on_crtc(crtc, plane_id)
+		skl_ddb_get_hw_plane_state(i915, pipe,
+					   plane_id,
+					   &ddb[plane_id],
+					   &ddb_y[plane_id]);
+
+	intel_display_power_put(i915, power_domain, wakeref);
+}
+
+struct dbuf_slice_conf_entry {
+	u8 active_pipes;
+	u8 dbuf_mask[I915_MAX_PIPES];
+	bool join_mbus;
+};
+
+/*
+ * Table taken from Bspec 12716
+ * Pipes do have some preferred DBuf slice affinity,
+ * plus there are some hardcoded requirements on how
+ * those should be distributed for multipipe scenarios.
+ * For more DBuf slices algorithm can get even more messy
+ * and less readable, so decided to use a table almost
+ * as is from BSpec itself - that way it is at least easier
+ * to compare, change and check.
+ */
+static const struct dbuf_slice_conf_entry icl_allowed_dbufs[] =
+/* Autogenerated with igt/tools/intel_dbuf_map tool: */
+{
+	{
+		.active_pipes = BIT(PIPE_A),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{}
+};
+
+/*
+ * Table taken from Bspec 49255
+ * Pipes do have some preferred DBuf slice affinity,
+ * plus there are some hardcoded requirements on how
+ * those should be distributed for multipipe scenarios.
+ * For more DBuf slices algorithm can get even more messy
+ * and less readable, so decided to use a table almost
+ * as is from BSpec itself - that way it is at least easier
+ * to compare, change and check.
+ */
+static const struct dbuf_slice_conf_entry tgl_allowed_dbufs[] =
+/* Autogenerated with igt/tools/intel_dbuf_map tool: */
+{
+	{
+		.active_pipes = BIT(PIPE_A),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S2),
+			[PIPE_B] = BIT(DBUF_S1),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S2) | BIT(DBUF_S1),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_D] = BIT(DBUF_S2) | BIT(DBUF_S1),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S1),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S1),
+			[PIPE_C] = BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S2),
+		},
+	},
+	{}
+};
+
+static const struct dbuf_slice_conf_entry dg2_allowed_dbufs[] = {
+	{
+		.active_pipes = BIT(PIPE_A),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_D] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S3),
+			[PIPE_D] = BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3),
+			[PIPE_D] = BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3),
+			[PIPE_D] = BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1),
+			[PIPE_B] = BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3),
+			[PIPE_D] = BIT(DBUF_S4),
+		},
+	},
+	{}
+};
+
+static const struct dbuf_slice_conf_entry adlp_allowed_dbufs[] = {
+	/*
+	 * Keep the join_mbus cases first so check_mbus_joined()
+	 * will prefer them over the !join_mbus cases.
+	 */
+	{
+		.active_pipes = BIT(PIPE_A),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2) | BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+		.join_mbus = true,
+	},
+	{
+		.active_pipes = BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S1) | BIT(DBUF_S2) | BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+		.join_mbus = true,
+	},
+	{
+		.active_pipes = BIT(PIPE_A),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+		.join_mbus = false,
+	},
+	{
+		.active_pipes = BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+		.join_mbus = false,
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{
+		.active_pipes = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C) | BIT(PIPE_D),
+		.dbuf_mask = {
+			[PIPE_A] = BIT(DBUF_S1) | BIT(DBUF_S2),
+			[PIPE_B] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_C] = BIT(DBUF_S3) | BIT(DBUF_S4),
+			[PIPE_D] = BIT(DBUF_S1) | BIT(DBUF_S2),
+		},
+	},
+	{}
+
+};
+
+static bool check_mbus_joined(u8 active_pipes,
+			      const struct dbuf_slice_conf_entry *dbuf_slices)
+{
+	int i;
+
+	for (i = 0; dbuf_slices[i].active_pipes != 0; i++) {
+		if (dbuf_slices[i].active_pipes == active_pipes)
+			return dbuf_slices[i].join_mbus;
+	}
+	return false;
+}
+
+static bool adlp_check_mbus_joined(u8 active_pipes)
+{
+	return check_mbus_joined(active_pipes, adlp_allowed_dbufs);
+}
+
+static u8 compute_dbuf_slices(enum pipe pipe, u8 active_pipes, bool join_mbus,
+			      const struct dbuf_slice_conf_entry *dbuf_slices)
+{
+	int i;
+
+	for (i = 0; dbuf_slices[i].active_pipes != 0; i++) {
+		if (dbuf_slices[i].active_pipes == active_pipes &&
+		    dbuf_slices[i].join_mbus == join_mbus)
+			return dbuf_slices[i].dbuf_mask[pipe];
+	}
+	return 0;
+}
+
+/*
+ * This function finds an entry with same enabled pipe configuration and
+ * returns correspondent DBuf slice mask as stated in BSpec for particular
+ * platform.
+ */
+static u8 icl_compute_dbuf_slices(enum pipe pipe, u8 active_pipes, bool join_mbus)
+{
+	/*
+	 * FIXME: For ICL this is still a bit unclear as prev BSpec revision
+	 * required calculating "pipe ratio" in order to determine
+	 * if one or two slices can be used for single pipe configurations
+	 * as additional constraint to the existing table.
+	 * However based on recent info, it should be not "pipe ratio"
+	 * but rather ratio between pixel_rate and cdclk with additional
+	 * constants, so for now we are using only table until this is
+	 * clarified. Also this is the reason why crtc_state param is
+	 * still here - we will need it once those additional constraints
+	 * pop up.
+	 */
+	return compute_dbuf_slices(pipe, active_pipes, join_mbus,
+				   icl_allowed_dbufs);
+}
+
+static u8 tgl_compute_dbuf_slices(enum pipe pipe, u8 active_pipes, bool join_mbus)
+{
+	return compute_dbuf_slices(pipe, active_pipes, join_mbus,
+				   tgl_allowed_dbufs);
+}
+
+static u8 adlp_compute_dbuf_slices(enum pipe pipe, u8 active_pipes, bool join_mbus)
+{
+	return compute_dbuf_slices(pipe, active_pipes, join_mbus,
+				   adlp_allowed_dbufs);
+}
+
+static u8 dg2_compute_dbuf_slices(enum pipe pipe, u8 active_pipes, bool join_mbus)
+{
+	return compute_dbuf_slices(pipe, active_pipes, join_mbus,
+				   dg2_allowed_dbufs);
+}
+
+static u8 skl_compute_dbuf_slices(struct intel_crtc *crtc, u8 active_pipes, bool join_mbus)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+
+	if (IS_DG2(i915))
+		return dg2_compute_dbuf_slices(pipe, active_pipes, join_mbus);
+	else if (DISPLAY_VER(i915) >= 13)
+		return adlp_compute_dbuf_slices(pipe, active_pipes, join_mbus);
+	else if (DISPLAY_VER(i915) == 12)
+		return tgl_compute_dbuf_slices(pipe, active_pipes, join_mbus);
+	else if (DISPLAY_VER(i915) == 11)
+		return icl_compute_dbuf_slices(pipe, active_pipes, join_mbus);
+	/*
+	 * For anything else just return one slice yet.
+	 * Should be extended for other platforms.
+	 */
+	return active_pipes & BIT(pipe) ? BIT(DBUF_S1) : 0;
+}
+
+static bool
+use_minimal_wm0_only(const struct intel_crtc_state *crtc_state,
+		     struct intel_plane *plane)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+
+	return DISPLAY_VER(i915) >= 13 &&
+	       crtc_state->uapi.async_flip &&
+	       plane->async_flip;
+}
+
+static u64
+skl_total_relative_data_rate(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	enum plane_id plane_id;
+	u64 data_rate = 0;
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		if (plane_id == PLANE_CURSOR)
+			continue;
+
+		data_rate += crtc_state->rel_data_rate[plane_id];
+
+		if (DISPLAY_VER(i915) < 11)
+			data_rate += crtc_state->rel_data_rate_y[plane_id];
+	}
+
+	return data_rate;
+}
+
+static const struct skl_wm_level *
+skl_plane_wm_level(const struct skl_pipe_wm *pipe_wm,
+		   enum plane_id plane_id,
+		   int level)
+{
+	const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
+
+	if (level == 0 && pipe_wm->use_sagv_wm)
+		return &wm->sagv.wm0;
+
+	return &wm->wm[level];
+}
+
+static const struct skl_wm_level *
+skl_plane_trans_wm(const struct skl_pipe_wm *pipe_wm,
+		   enum plane_id plane_id)
+{
+	const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
+
+	if (pipe_wm->use_sagv_wm)
+		return &wm->sagv.trans_wm;
+
+	return &wm->trans_wm;
+}
+
+/*
+ * We only disable the watermarks for each plane if
+ * they exceed the ddb allocation of said plane. This
+ * is done so that we don't end up touching cursor
+ * watermarks needlessly when some other plane reduces
+ * our max possible watermark level.
+ *
+ * Bspec has this to say about the PLANE_WM enable bit:
+ * "All the watermarks at this level for all enabled
+ *  planes must be enabled before the level will be used."
+ * So this is actually safe to do.
+ */
+static void
+skl_check_wm_level(struct skl_wm_level *wm, const struct skl_ddb_entry *ddb)
+{
+	if (wm->min_ddb_alloc > skl_ddb_entry_size(ddb))
+		memset(wm, 0, sizeof(*wm));
+}
+
+static void
+skl_check_nv12_wm_level(struct skl_wm_level *wm, struct skl_wm_level *uv_wm,
+			const struct skl_ddb_entry *ddb_y, const struct skl_ddb_entry *ddb)
+{
+	if (wm->min_ddb_alloc > skl_ddb_entry_size(ddb_y) ||
+	    uv_wm->min_ddb_alloc > skl_ddb_entry_size(ddb)) {
+		memset(wm, 0, sizeof(*wm));
+		memset(uv_wm, 0, sizeof(*uv_wm));
+	}
+}
+
+static bool icl_need_wm1_wa(struct drm_i915_private *i915,
+			    enum plane_id plane_id)
+{
+	/*
+	 * Wa_1408961008:icl, ehl
+	 * Wa_14012656716:tgl, adl
+	 * Underruns with WM1+ disabled
+	 */
+	return DISPLAY_VER(i915) == 11 ||
+	       (IS_DISPLAY_VER(i915, 12, 13) && plane_id == PLANE_CURSOR);
+}
+
+struct skl_plane_ddb_iter {
+	u64 data_rate;
+	u16 start, size;
+};
+
+static void
+skl_allocate_plane_ddb(struct skl_plane_ddb_iter *iter,
+		       struct skl_ddb_entry *ddb,
+		       const struct skl_wm_level *wm,
+		       u64 data_rate)
+{
+	u16 size, extra = 0;
+
+	if (data_rate) {
+		extra = min_t(u16, iter->size,
+			      DIV64_U64_ROUND_UP(iter->size * data_rate,
+						 iter->data_rate));
+		iter->size -= extra;
+		iter->data_rate -= data_rate;
+	}
+
+	/*
+	 * Keep ddb entry of all disabled planes explicitly zeroed
+	 * to avoid skl_ddb_add_affected_planes() adding them to
+	 * the state when other planes change their allocations.
+	 */
+	size = wm->min_ddb_alloc + extra;
+	if (size)
+		iter->start = skl_ddb_entry_init(ddb, iter->start,
+						 iter->start + size);
+}
+
+static int
+skl_crtc_allocate_plane_ddb(struct intel_atomic_state *state,
+			    struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_dbuf_state *dbuf_state =
+		intel_atomic_get_new_dbuf_state(state);
+	const struct skl_ddb_entry *alloc = &dbuf_state->ddb[crtc->pipe];
+	int num_active = hweight8(dbuf_state->active_pipes);
+	struct skl_plane_ddb_iter iter;
+	enum plane_id plane_id;
+	u16 cursor_size;
+	u32 blocks;
+	int level;
+
+	/* Clear the partitioning for disabled planes. */
+	memset(crtc_state->wm.skl.plane_ddb, 0, sizeof(crtc_state->wm.skl.plane_ddb));
+	memset(crtc_state->wm.skl.plane_ddb_y, 0, sizeof(crtc_state->wm.skl.plane_ddb_y));
+
+	if (!crtc_state->hw.active)
+		return 0;
+
+	iter.start = alloc->start;
+	iter.size = skl_ddb_entry_size(alloc);
+	if (iter.size == 0)
+		return 0;
+
+	/* Allocate fixed number of blocks for cursor. */
+	cursor_size = skl_cursor_allocation(crtc_state, num_active);
+	iter.size -= cursor_size;
+	skl_ddb_entry_init(&crtc_state->wm.skl.plane_ddb[PLANE_CURSOR],
+			   alloc->end - cursor_size, alloc->end);
+
+	iter.data_rate = skl_total_relative_data_rate(crtc_state);
+
+	/*
+	 * Find the highest watermark level for which we can satisfy the block
+	 * requirement of active planes.
+	 */
+	for (level = ilk_wm_max_level(i915); level >= 0; level--) {
+		blocks = 0;
+		for_each_plane_id_on_crtc(crtc, plane_id) {
+			const struct skl_plane_wm *wm =
+				&crtc_state->wm.skl.optimal.planes[plane_id];
+
+			if (plane_id == PLANE_CURSOR) {
+				const struct skl_ddb_entry *ddb =
+					&crtc_state->wm.skl.plane_ddb[plane_id];
+
+				if (wm->wm[level].min_ddb_alloc > skl_ddb_entry_size(ddb)) {
+					drm_WARN_ON(&i915->drm,
+						    wm->wm[level].min_ddb_alloc != U16_MAX);
+					blocks = U32_MAX;
+					break;
+				}
+				continue;
+			}
+
+			blocks += wm->wm[level].min_ddb_alloc;
+			blocks += wm->uv_wm[level].min_ddb_alloc;
+		}
+
+		if (blocks <= iter.size) {
+			iter.size -= blocks;
+			break;
+		}
+	}
+
+	if (level < 0) {
+		drm_dbg_kms(&i915->drm,
+			    "Requested display configuration exceeds system DDB limitations");
+		drm_dbg_kms(&i915->drm, "minimum required %d/%d\n",
+			    blocks, iter.size);
+		return -EINVAL;
+	}
+
+	/* avoid the WARN later when we don't allocate any extra DDB */
+	if (iter.data_rate == 0)
+		iter.size = 0;
+
+	/*
+	 * Grant each plane the blocks it requires at the highest achievable
+	 * watermark level, plus an extra share of the leftover blocks
+	 * proportional to its relative data rate.
+	 */
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		struct skl_ddb_entry *ddb =
+			&crtc_state->wm.skl.plane_ddb[plane_id];
+		struct skl_ddb_entry *ddb_y =
+			&crtc_state->wm.skl.plane_ddb_y[plane_id];
+		const struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+
+		if (plane_id == PLANE_CURSOR)
+			continue;
+
+		if (DISPLAY_VER(i915) < 11 &&
+		    crtc_state->nv12_planes & BIT(plane_id)) {
+			skl_allocate_plane_ddb(&iter, ddb_y, &wm->wm[level],
+					       crtc_state->rel_data_rate_y[plane_id]);
+			skl_allocate_plane_ddb(&iter, ddb, &wm->uv_wm[level],
+					       crtc_state->rel_data_rate[plane_id]);
+		} else {
+			skl_allocate_plane_ddb(&iter, ddb, &wm->wm[level],
+					       crtc_state->rel_data_rate[plane_id]);
+		}
+	}
+	drm_WARN_ON(&i915->drm, iter.size != 0 || iter.data_rate != 0);
+
+	/*
+	 * When we calculated watermark values we didn't know how high
+	 * of a level we'd actually be able to hit, so we just marked
+	 * all levels as "enabled."  Go back now and disable the ones
+	 * that aren't actually possible.
+	 */
+	for (level++; level <= ilk_wm_max_level(i915); level++) {
+		for_each_plane_id_on_crtc(crtc, plane_id) {
+			const struct skl_ddb_entry *ddb =
+				&crtc_state->wm.skl.plane_ddb[plane_id];
+			const struct skl_ddb_entry *ddb_y =
+				&crtc_state->wm.skl.plane_ddb_y[plane_id];
+			struct skl_plane_wm *wm =
+				&crtc_state->wm.skl.optimal.planes[plane_id];
+
+			if (DISPLAY_VER(i915) < 11 &&
+			    crtc_state->nv12_planes & BIT(plane_id))
+				skl_check_nv12_wm_level(&wm->wm[level],
+							&wm->uv_wm[level],
+							ddb_y, ddb);
+			else
+				skl_check_wm_level(&wm->wm[level], ddb);
+
+			if (icl_need_wm1_wa(i915, plane_id) &&
+			    level == 1 && wm->wm[0].enable) {
+				wm->wm[level].blocks = wm->wm[0].blocks;
+				wm->wm[level].lines = wm->wm[0].lines;
+				wm->wm[level].ignore_lines = wm->wm[0].ignore_lines;
+			}
+		}
+	}
+
+	/*
+	 * Go back and disable the transition and SAGV watermarks
+	 * if it turns out we don't have enough DDB blocks for them.
+	 */
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		const struct skl_ddb_entry *ddb =
+			&crtc_state->wm.skl.plane_ddb[plane_id];
+		const struct skl_ddb_entry *ddb_y =
+			&crtc_state->wm.skl.plane_ddb_y[plane_id];
+		struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+
+		if (DISPLAY_VER(i915) < 11 &&
+		    crtc_state->nv12_planes & BIT(plane_id)) {
+			skl_check_wm_level(&wm->trans_wm, ddb_y);
+		} else {
+			WARN_ON(skl_ddb_entry_size(ddb_y));
+
+			skl_check_wm_level(&wm->trans_wm, ddb);
+		}
+
+		skl_check_wm_level(&wm->sagv.wm0, ddb);
+		skl_check_wm_level(&wm->sagv.trans_wm, ddb);
+	}
+
+	return 0;
+}
+
+/*
+ * The max latency should be 257 (max the punit can code is 255 and we add 2us
+ * for the read latency) and cpp should always be <= 8, so that
+ * should allow pixel_rate up to ~2 GHz which seems sufficient since max
+ * 2xcdclk is 1350 MHz and the pixel rate should never exceed that.
+ */
+static uint_fixed_16_16_t
+skl_wm_method1(const struct drm_i915_private *i915, u32 pixel_rate,
+	       u8 cpp, u32 latency, u32 dbuf_block_size)
+{
+	u32 wm_intermediate_val;
+	uint_fixed_16_16_t ret;
+
+	if (latency == 0)
+		return FP_16_16_MAX;
+
+	wm_intermediate_val = latency * pixel_rate * cpp;
+	ret = div_fixed16(wm_intermediate_val, 1000 * dbuf_block_size);
+
+	if (DISPLAY_VER(i915) >= 10)
+		ret = add_fixed16_u32(ret, 1);
+
+	return ret;
+}
+
+static uint_fixed_16_16_t
+skl_wm_method2(u32 pixel_rate, u32 pipe_htotal, u32 latency,
+	       uint_fixed_16_16_t plane_blocks_per_line)
+{
+	u32 wm_intermediate_val;
+	uint_fixed_16_16_t ret;
+
+	if (latency == 0)
+		return FP_16_16_MAX;
+
+	wm_intermediate_val = latency * pixel_rate;
+	wm_intermediate_val = DIV_ROUND_UP(wm_intermediate_val,
+					   pipe_htotal * 1000);
+	ret = mul_u32_fixed16(wm_intermediate_val, plane_blocks_per_line);
+	return ret;
+}
+
+static uint_fixed_16_16_t
+intel_get_linetime_us(const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	u32 pixel_rate;
+	u32 crtc_htotal;
+	uint_fixed_16_16_t linetime_us;
+
+	if (!crtc_state->hw.active)
+		return u32_to_fixed16(0);
+
+	pixel_rate = crtc_state->pixel_rate;
+
+	if (drm_WARN_ON(&i915->drm, pixel_rate == 0))
+		return u32_to_fixed16(0);
+
+	crtc_htotal = crtc_state->hw.pipe_mode.crtc_htotal;
+	linetime_us = div_fixed16(crtc_htotal * 1000, pixel_rate);
+
+	return linetime_us;
+}
+
+static int
+skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
+		      int width, const struct drm_format_info *format,
+		      u64 modifier, unsigned int rotation,
+		      u32 plane_pixel_rate, struct skl_wm_params *wp,
+		      int color_plane)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	u32 interm_pbpl;
+
+	/* only planar format has two planes */
+	if (color_plane == 1 &&
+	    !intel_format_info_is_yuv_semiplanar(format, modifier)) {
+		drm_dbg_kms(&i915->drm,
+			    "Non planar format have single plane\n");
+		return -EINVAL;
+	}
+
+	wp->y_tiled = modifier == I915_FORMAT_MOD_Y_TILED ||
+		      modifier == I915_FORMAT_MOD_4_TILED ||
+		      modifier == I915_FORMAT_MOD_Yf_TILED ||
+		      modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
+		      modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
+	wp->x_tiled = modifier == I915_FORMAT_MOD_X_TILED;
+	wp->rc_surface = modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
+			 modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
+	wp->is_planar = intel_format_info_is_yuv_semiplanar(format, modifier);
+
+	wp->width = width;
+	if (color_plane == 1 && wp->is_planar)
+		wp->width /= 2;
+
+	wp->cpp = format->cpp[color_plane];
+	wp->plane_pixel_rate = plane_pixel_rate;
+
+	if (DISPLAY_VER(i915) >= 11 &&
+	    modifier == I915_FORMAT_MOD_Yf_TILED  && wp->cpp == 1)
+		wp->dbuf_block_size = 256;
+	else
+		wp->dbuf_block_size = 512;
+
+	if (drm_rotation_90_or_270(rotation)) {
+		switch (wp->cpp) {
+		case 1:
+			wp->y_min_scanlines = 16;
+			break;
+		case 2:
+			wp->y_min_scanlines = 8;
+			break;
+		case 4:
+			wp->y_min_scanlines = 4;
+			break;
+		default:
+			MISSING_CASE(wp->cpp);
+			return -EINVAL;
+		}
+	} else {
+		wp->y_min_scanlines = 4;
+	}
+
+	if (skl_needs_memory_bw_wa(i915))
+		wp->y_min_scanlines *= 2;
+
+	wp->plane_bytes_per_line = wp->width * wp->cpp;
+	if (wp->y_tiled) {
+		interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line *
+					   wp->y_min_scanlines,
+					   wp->dbuf_block_size);
+
+		if (DISPLAY_VER(i915) >= 10)
+			interm_pbpl++;
+
+		wp->plane_blocks_per_line = div_fixed16(interm_pbpl,
+							wp->y_min_scanlines);
+	} else {
+		interm_pbpl = DIV_ROUND_UP(wp->plane_bytes_per_line,
+					   wp->dbuf_block_size);
+
+		if (!wp->x_tiled || DISPLAY_VER(i915) >= 10)
+			interm_pbpl++;
+
+		wp->plane_blocks_per_line = u32_to_fixed16(interm_pbpl);
+	}
+
+	wp->y_tile_minimum = mul_u32_fixed16(wp->y_min_scanlines,
+					     wp->plane_blocks_per_line);
+
+	wp->linetime_us = fixed16_to_u32_round_up(intel_get_linetime_us(crtc_state));
+
+	return 0;
+}
+
+static int
+skl_compute_plane_wm_params(const struct intel_crtc_state *crtc_state,
+			    const struct intel_plane_state *plane_state,
+			    struct skl_wm_params *wp, int color_plane)
+{
+	const struct drm_framebuffer *fb = plane_state->hw.fb;
+	int width;
+
+	/*
+	 * Src coordinates are already rotated by 270 degrees for
+	 * the 90/270 degree plane rotation cases (to match the
+	 * GTT mapping), hence no need to account for rotation here.
+	 */
+	width = drm_rect_width(&plane_state->uapi.src) >> 16;
+
+	return skl_compute_wm_params(crtc_state, width,
+				     fb->format, fb->modifier,
+				     plane_state->hw.rotation,
+				     intel_plane_pixel_rate(crtc_state, plane_state),
+				     wp, color_plane);
+}
+
+static bool skl_wm_has_lines(struct drm_i915_private *i915, int level)
+{
+	if (DISPLAY_VER(i915) >= 10)
+		return true;
+
+	/* The number of lines are ignored for the level 0 watermark. */
+	return level > 0;
+}
+
+static int skl_wm_max_lines(struct drm_i915_private *i915)
+{
+	if (DISPLAY_VER(i915) >= 13)
+		return 255;
+	else
+		return 31;
+}
+
+static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
+				 struct intel_plane *plane,
+				 int level,
+				 unsigned int latency,
+				 const struct skl_wm_params *wp,
+				 const struct skl_wm_level *result_prev,
+				 struct skl_wm_level *result /* out */)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	uint_fixed_16_16_t method1, method2;
+	uint_fixed_16_16_t selected_result;
+	u32 blocks, lines, min_ddb_alloc = 0;
+
+	if (latency == 0 ||
+	    (use_minimal_wm0_only(crtc_state, plane) && level > 0)) {
+		/* reject it */
+		result->min_ddb_alloc = U16_MAX;
+		return;
+	}
+
+	/*
+	 * WaIncreaseLatencyIPCEnabled: kbl,cfl
+	 * Display WA #1141: kbl,cfl
+	 */
+	if ((IS_KABYLAKE(i915) ||
+	     IS_COFFEELAKE(i915) ||
+	     IS_COMETLAKE(i915)) &&
+	    i915->ipc_enabled)
+		latency += 4;
+
+	if (skl_needs_memory_bw_wa(i915) && wp->x_tiled)
+		latency += 15;
+
+	method1 = skl_wm_method1(i915, wp->plane_pixel_rate,
+				 wp->cpp, latency, wp->dbuf_block_size);
+	method2 = skl_wm_method2(wp->plane_pixel_rate,
+				 crtc_state->hw.pipe_mode.crtc_htotal,
+				 latency,
+				 wp->plane_blocks_per_line);
+
+	if (wp->y_tiled) {
+		selected_result = max_fixed16(method2, wp->y_tile_minimum);
+	} else {
+		if ((wp->cpp * crtc_state->hw.pipe_mode.crtc_htotal /
+		     wp->dbuf_block_size < 1) &&
+		     (wp->plane_bytes_per_line / wp->dbuf_block_size < 1)) {
+			selected_result = method2;
+		} else if (latency >= wp->linetime_us) {
+			if (DISPLAY_VER(i915) == 9)
+				selected_result = min_fixed16(method1, method2);
+			else
+				selected_result = method2;
+		} else {
+			selected_result = method1;
+		}
+	}
+
+	blocks = fixed16_to_u32_round_up(selected_result) + 1;
+	/*
+	 * Lets have blocks at minimum equivalent to plane_blocks_per_line
+	 * as there will be at minimum one line for lines configuration. This
+	 * is a work around for FIFO underruns observed with resolutions like
+	 * 4k 60 Hz in single channel DRAM configurations.
+	 *
+	 * As per the Bspec 49325, if the ddb allocation can hold at least
+	 * one plane_blocks_per_line, we should have selected method2 in
+	 * the above logic. Assuming that modern versions have enough dbuf
+	 * and method2 guarantees blocks equivalent to at least 1 line,
+	 * select the blocks as plane_blocks_per_line.
+	 *
+	 * TODO: Revisit the logic when we have better understanding on DRAM
+	 * channels' impact on the level 0 memory latency and the relevant
+	 * wm calculations.
+	 */
+	if (skl_wm_has_lines(i915, level))
+		blocks = max(blocks,
+			     fixed16_to_u32_round_up(wp->plane_blocks_per_line));
+	lines = div_round_up_fixed16(selected_result,
+				     wp->plane_blocks_per_line);
+
+	if (DISPLAY_VER(i915) == 9) {
+		/* Display WA #1125: skl,bxt,kbl */
+		if (level == 0 && wp->rc_surface)
+			blocks += fixed16_to_u32_round_up(wp->y_tile_minimum);
+
+		/* Display WA #1126: skl,bxt,kbl */
+		if (level >= 1 && level <= 7) {
+			if (wp->y_tiled) {
+				blocks += fixed16_to_u32_round_up(wp->y_tile_minimum);
+				lines += wp->y_min_scanlines;
+			} else {
+				blocks++;
+			}
+
+			/*
+			 * Make sure result blocks for higher latency levels are
+			 * at least as high as level below the current level.
+			 * Assumption in DDB algorithm optimization for special
+			 * cases. Also covers Display WA #1125 for RC.
+			 */
+			if (result_prev->blocks > blocks)
+				blocks = result_prev->blocks;
+		}
+	}
+
+	if (DISPLAY_VER(i915) >= 11) {
+		if (wp->y_tiled) {
+			int extra_lines;
+
+			if (lines % wp->y_min_scanlines == 0)
+				extra_lines = wp->y_min_scanlines;
+			else
+				extra_lines = wp->y_min_scanlines * 2 -
+					lines % wp->y_min_scanlines;
+
+			min_ddb_alloc = mul_round_up_u32_fixed16(lines + extra_lines,
+								 wp->plane_blocks_per_line);
+		} else {
+			min_ddb_alloc = blocks + DIV_ROUND_UP(blocks, 10);
+		}
+	}
+
+	if (!skl_wm_has_lines(i915, level))
+		lines = 0;
+
+	if (lines > skl_wm_max_lines(i915)) {
+		/* reject it */
+		result->min_ddb_alloc = U16_MAX;
+		return;
+	}
+
+	/*
+	 * If lines is valid, assume we can use this watermark level
+	 * for now.  We'll come back and disable it after we calculate the
+	 * DDB allocation if it turns out we don't actually have enough
+	 * blocks to satisfy it.
+	 */
+	result->blocks = blocks;
+	result->lines = lines;
+	/* Bspec says: value >= plane ddb allocation -> invalid, hence the +1 here */
+	result->min_ddb_alloc = max(min_ddb_alloc, blocks) + 1;
+	result->enable = true;
+
+	if (DISPLAY_VER(i915) < 12 && i915->display.sagv.block_time_us)
+		result->can_sagv = latency >= i915->display.sagv.block_time_us;
+}
+
+static void
+skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
+		      struct intel_plane *plane,
+		      const struct skl_wm_params *wm_params,
+		      struct skl_wm_level *levels)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	int level, max_level = ilk_wm_max_level(i915);
+	struct skl_wm_level *result_prev = &levels[0];
+
+	for (level = 0; level <= max_level; level++) {
+		struct skl_wm_level *result = &levels[level];
+		unsigned int latency = i915->display.wm.skl_latency[level];
+
+		skl_compute_plane_wm(crtc_state, plane, level, latency,
+				     wm_params, result_prev, result);
+
+		result_prev = result;
+	}
+}
+
+static void tgl_compute_sagv_wm(const struct intel_crtc_state *crtc_state,
+				struct intel_plane *plane,
+				const struct skl_wm_params *wm_params,
+				struct skl_plane_wm *plane_wm)
+{
+	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+	struct skl_wm_level *sagv_wm = &plane_wm->sagv.wm0;
+	struct skl_wm_level *levels = plane_wm->wm;
+	unsigned int latency = 0;
+
+	if (i915->display.sagv.block_time_us)
+		latency = i915->display.sagv.block_time_us + i915->display.wm.skl_latency[0];
+
+	skl_compute_plane_wm(crtc_state, plane, 0, latency,
+			     wm_params, &levels[0],
+			     sagv_wm);
+}
+
+static void skl_compute_transition_wm(struct drm_i915_private *i915,
+				      struct skl_wm_level *trans_wm,
+				      const struct skl_wm_level *wm0,
+				      const struct skl_wm_params *wp)
+{
+	u16 trans_min, trans_amount, trans_y_tile_min;
+	u16 wm0_blocks, trans_offset, blocks;
+
+	/* Transition WM don't make any sense if ipc is disabled */
+	if (!i915->ipc_enabled)
+		return;
+
+	/*
+	 * WaDisableTWM:skl,kbl,cfl,bxt
+	 * Transition WM are not recommended by HW team for GEN9
+	 */
+	if (DISPLAY_VER(i915) == 9)
+		return;
+
+	if (DISPLAY_VER(i915) >= 11)
+		trans_min = 4;
+	else
+		trans_min = 14;
+
+	/* Display WA #1140: glk,cnl */
+	if (DISPLAY_VER(i915) == 10)
+		trans_amount = 0;
+	else
+		trans_amount = 10; /* This is configurable amount */
+
+	trans_offset = trans_min + trans_amount;
+
+	/*
+	 * The spec asks for Selected Result Blocks for wm0 (the real value),
+	 * not Result Blocks (the integer value). Pay attention to the capital
+	 * letters. The value wm_l0->blocks is actually Result Blocks, but
+	 * since Result Blocks is the ceiling of Selected Result Blocks plus 1,
+	 * and since we later will have to get the ceiling of the sum in the
+	 * transition watermarks calculation, we can just pretend Selected
+	 * Result Blocks is Result Blocks minus 1 and it should work for the
+	 * current platforms.
+	 */
+	wm0_blocks = wm0->blocks - 1;
+
+	if (wp->y_tiled) {
+		trans_y_tile_min =
+			(u16)mul_round_up_u32_fixed16(2, wp->y_tile_minimum);
+		blocks = max(wm0_blocks, trans_y_tile_min) + trans_offset;
+	} else {
+		blocks = wm0_blocks + trans_offset;
+	}
+	blocks++;
+
+	/*
+	 * Just assume we can enable the transition watermark.  After
+	 * computing the DDB we'll come back and disable it if that
+	 * assumption turns out to be false.
+	 */
+	trans_wm->blocks = blocks;
+	trans_wm->min_ddb_alloc = max_t(u16, wm0->min_ddb_alloc, blocks + 1);
+	trans_wm->enable = true;
+}
+
+static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
+				     const struct intel_plane_state *plane_state,
+				     struct intel_plane *plane, int color_plane)
+{
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	struct skl_plane_wm *wm = &crtc_state->wm.skl.raw.planes[plane->id];
+	struct skl_wm_params wm_params;
+	int ret;
+
+	ret = skl_compute_plane_wm_params(crtc_state, plane_state,
+					  &wm_params, color_plane);
+	if (ret)
+		return ret;
+
+	skl_compute_wm_levels(crtc_state, plane, &wm_params, wm->wm);
+
+	skl_compute_transition_wm(i915, &wm->trans_wm,
+				  &wm->wm[0], &wm_params);
+
+	if (DISPLAY_VER(i915) >= 12) {
+		tgl_compute_sagv_wm(crtc_state, plane, &wm_params, wm);
+
+		skl_compute_transition_wm(i915, &wm->sagv.trans_wm,
+					  &wm->sagv.wm0, &wm_params);
+	}
+
+	return 0;
+}
+
+static int skl_build_plane_wm_uv(struct intel_crtc_state *crtc_state,
+				 const struct intel_plane_state *plane_state,
+				 struct intel_plane *plane)
+{
+	struct skl_plane_wm *wm = &crtc_state->wm.skl.raw.planes[plane->id];
+	struct skl_wm_params wm_params;
+	int ret;
+
+	wm->is_planar = true;
+
+	/* uv plane watermarks must also be validated for NV12/Planar */
+	ret = skl_compute_plane_wm_params(crtc_state, plane_state,
+					  &wm_params, 1);
+	if (ret)
+		return ret;
+
+	skl_compute_wm_levels(crtc_state, plane, &wm_params, wm->uv_wm);
+
+	return 0;
+}
+
+static int skl_build_plane_wm(struct intel_crtc_state *crtc_state,
+			      const struct intel_plane_state *plane_state)
+{
+	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+	enum plane_id plane_id = plane->id;
+	struct skl_plane_wm *wm = &crtc_state->wm.skl.raw.planes[plane_id];
+	const struct drm_framebuffer *fb = plane_state->hw.fb;
+	int ret;
+
+	memset(wm, 0, sizeof(*wm));
+
+	if (!intel_wm_plane_visible(crtc_state, plane_state))
+		return 0;
+
+	ret = skl_build_plane_wm_single(crtc_state, plane_state,
+					plane, 0);
+	if (ret)
+		return ret;
+
+	if (fb->format->is_yuv && fb->format->num_planes > 1) {
+		ret = skl_build_plane_wm_uv(crtc_state, plane_state,
+					    plane);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int icl_build_plane_wm(struct intel_crtc_state *crtc_state,
+			      const struct intel_plane_state *plane_state)
+{
+	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	enum plane_id plane_id = plane->id;
+	struct skl_plane_wm *wm = &crtc_state->wm.skl.raw.planes[plane_id];
+	int ret;
+
+	/* Watermarks calculated in master */
+	if (plane_state->planar_slave)
+		return 0;
+
+	memset(wm, 0, sizeof(*wm));
+
+	if (plane_state->planar_linked_plane) {
+		const struct drm_framebuffer *fb = plane_state->hw.fb;
+
+		drm_WARN_ON(&i915->drm,
+			    !intel_wm_plane_visible(crtc_state, plane_state));
+		drm_WARN_ON(&i915->drm, !fb->format->is_yuv ||
+			    fb->format->num_planes == 1);
+
+		ret = skl_build_plane_wm_single(crtc_state, plane_state,
+						plane_state->planar_linked_plane, 0);
+		if (ret)
+			return ret;
+
+		ret = skl_build_plane_wm_single(crtc_state, plane_state,
+						plane, 1);
+		if (ret)
+			return ret;
+	} else if (intel_wm_plane_visible(crtc_state, plane_state)) {
+		ret = skl_build_plane_wm_single(crtc_state, plane_state,
+						plane, 0);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int skl_build_pipe_wm(struct intel_atomic_state *state,
+			     struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_plane_state *plane_state;
+	struct intel_plane *plane;
+	int ret, i;
+
+	for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
+		/*
+		 * FIXME should perhaps check {old,new}_plane_crtc->hw.crtc
+		 * instead but we don't populate that correctly for NV12 Y
+		 * planes so for now hack this.
+		 */
+		if (plane->pipe != crtc->pipe)
+			continue;
+
+		if (DISPLAY_VER(i915) >= 11)
+			ret = icl_build_plane_wm(crtc_state, plane_state);
+		else
+			ret = skl_build_plane_wm(crtc_state, plane_state);
+		if (ret)
+			return ret;
+	}
+
+	crtc_state->wm.skl.optimal = crtc_state->wm.skl.raw;
+
+	return 0;
+}
+
+static void skl_ddb_entry_write(struct drm_i915_private *i915,
+				i915_reg_t reg,
+				const struct skl_ddb_entry *entry)
+{
+	if (entry->end)
+		intel_de_write_fw(i915, reg,
+				  PLANE_BUF_END(entry->end - 1) |
+				  PLANE_BUF_START(entry->start));
+	else
+		intel_de_write_fw(i915, reg, 0);
+}
+
+static void skl_write_wm_level(struct drm_i915_private *i915,
+			       i915_reg_t reg,
+			       const struct skl_wm_level *level)
+{
+	u32 val = 0;
+
+	if (level->enable)
+		val |= PLANE_WM_EN;
+	if (level->ignore_lines)
+		val |= PLANE_WM_IGNORE_LINES;
+	val |= REG_FIELD_PREP(PLANE_WM_BLOCKS_MASK, level->blocks);
+	val |= REG_FIELD_PREP(PLANE_WM_LINES_MASK, level->lines);
+
+	intel_de_write_fw(i915, reg, val);
+}
+
+void skl_write_plane_wm(struct intel_plane *plane,
+			const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	int level, max_level = ilk_wm_max_level(i915);
+	enum plane_id plane_id = plane->id;
+	enum pipe pipe = plane->pipe;
+	const struct skl_pipe_wm *pipe_wm = &crtc_state->wm.skl.optimal;
+	const struct skl_ddb_entry *ddb =
+		&crtc_state->wm.skl.plane_ddb[plane_id];
+	const struct skl_ddb_entry *ddb_y =
+		&crtc_state->wm.skl.plane_ddb_y[plane_id];
+
+	for (level = 0; level <= max_level; level++)
+		skl_write_wm_level(i915, PLANE_WM(pipe, plane_id, level),
+				   skl_plane_wm_level(pipe_wm, plane_id, level));
+
+	skl_write_wm_level(i915, PLANE_WM_TRANS(pipe, plane_id),
+			   skl_plane_trans_wm(pipe_wm, plane_id));
+
+	if (HAS_HW_SAGV_WM(i915)) {
+		const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
+
+		skl_write_wm_level(i915, PLANE_WM_SAGV(pipe, plane_id),
+				   &wm->sagv.wm0);
+		skl_write_wm_level(i915, PLANE_WM_SAGV_TRANS(pipe, plane_id),
+				   &wm->sagv.trans_wm);
+	}
+
+	skl_ddb_entry_write(i915,
+			    PLANE_BUF_CFG(pipe, plane_id), ddb);
+
+	if (DISPLAY_VER(i915) < 11)
+		skl_ddb_entry_write(i915,
+				    PLANE_NV12_BUF_CFG(pipe, plane_id), ddb_y);
+}
+
+void skl_write_cursor_wm(struct intel_plane *plane,
+			 const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	int level, max_level = ilk_wm_max_level(i915);
+	enum plane_id plane_id = plane->id;
+	enum pipe pipe = plane->pipe;
+	const struct skl_pipe_wm *pipe_wm = &crtc_state->wm.skl.optimal;
+	const struct skl_ddb_entry *ddb =
+		&crtc_state->wm.skl.plane_ddb[plane_id];
+
+	for (level = 0; level <= max_level; level++)
+		skl_write_wm_level(i915, CUR_WM(pipe, level),
+				   skl_plane_wm_level(pipe_wm, plane_id, level));
+
+	skl_write_wm_level(i915, CUR_WM_TRANS(pipe),
+			   skl_plane_trans_wm(pipe_wm, plane_id));
+
+	if (HAS_HW_SAGV_WM(i915)) {
+		const struct skl_plane_wm *wm = &pipe_wm->planes[plane_id];
+
+		skl_write_wm_level(i915, CUR_WM_SAGV(pipe),
+				   &wm->sagv.wm0);
+		skl_write_wm_level(i915, CUR_WM_SAGV_TRANS(pipe),
+				   &wm->sagv.trans_wm);
+	}
+
+	skl_ddb_entry_write(i915, CUR_BUF_CFG(pipe), ddb);
+}
+
+static bool skl_wm_level_equals(const struct skl_wm_level *l1,
+				const struct skl_wm_level *l2)
+{
+	return l1->enable == l2->enable &&
+		l1->ignore_lines == l2->ignore_lines &&
+		l1->lines == l2->lines &&
+		l1->blocks == l2->blocks;
+}
+
+static bool skl_plane_wm_equals(struct drm_i915_private *i915,
+				const struct skl_plane_wm *wm1,
+				const struct skl_plane_wm *wm2)
+{
+	int level, max_level = ilk_wm_max_level(i915);
+
+	for (level = 0; level <= max_level; level++) {
+		/*
+		 * We don't check uv_wm as the hardware doesn't actually
+		 * use it. It only gets used for calculating the required
+		 * ddb allocation.
+		 */
+		if (!skl_wm_level_equals(&wm1->wm[level], &wm2->wm[level]))
+			return false;
+	}
+
+	return skl_wm_level_equals(&wm1->trans_wm, &wm2->trans_wm) &&
+		skl_wm_level_equals(&wm1->sagv.wm0, &wm2->sagv.wm0) &&
+		skl_wm_level_equals(&wm1->sagv.trans_wm, &wm2->sagv.trans_wm);
+}
+
+static bool skl_ddb_entries_overlap(const struct skl_ddb_entry *a,
+				    const struct skl_ddb_entry *b)
+{
+	return a->start < b->end && b->start < a->end;
+}
+
+static void skl_ddb_entry_union(struct skl_ddb_entry *a,
+				const struct skl_ddb_entry *b)
+{
+	if (a->end && b->end) {
+		a->start = min(a->start, b->start);
+		a->end = max(a->end, b->end);
+	} else if (b->end) {
+		a->start = b->start;
+		a->end = b->end;
+	}
+}
+
+bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry *ddb,
+				 const struct skl_ddb_entry *entries,
+				 int num_entries, int ignore_idx)
+{
+	int i;
+
+	for (i = 0; i < num_entries; i++) {
+		if (i != ignore_idx &&
+		    skl_ddb_entries_overlap(ddb, &entries[i]))
+			return true;
+	}
+
+	return false;
+}
+
+static int
+skl_ddb_add_affected_planes(const struct intel_crtc_state *old_crtc_state,
+			    struct intel_crtc_state *new_crtc_state)
+{
+	struct intel_atomic_state *state = to_intel_atomic_state(new_crtc_state->uapi.state);
+	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	struct intel_plane *plane;
+
+	for_each_intel_plane_on_crtc(&i915->drm, crtc, plane) {
+		struct intel_plane_state *plane_state;
+		enum plane_id plane_id = plane->id;
+
+		if (skl_ddb_entry_equal(&old_crtc_state->wm.skl.plane_ddb[plane_id],
+					&new_crtc_state->wm.skl.plane_ddb[plane_id]) &&
+		    skl_ddb_entry_equal(&old_crtc_state->wm.skl.plane_ddb_y[plane_id],
+					&new_crtc_state->wm.skl.plane_ddb_y[plane_id]))
+			continue;
+
+		plane_state = intel_atomic_get_plane_state(state, plane);
+		if (IS_ERR(plane_state))
+			return PTR_ERR(plane_state);
+
+		new_crtc_state->update_planes |= BIT(plane_id);
+	}
+
+	return 0;
+}
+
+static u8 intel_dbuf_enabled_slices(const struct intel_dbuf_state *dbuf_state)
+{
+	struct drm_i915_private *i915 = to_i915(dbuf_state->base.state->base.dev);
+	u8 enabled_slices;
+	enum pipe pipe;
+
+	/*
+	 * FIXME: For now we always enable slice S1 as per
+	 * the Bspec display initialization sequence.
+	 */
+	enabled_slices = BIT(DBUF_S1);
+
+	for_each_pipe(i915, pipe)
+		enabled_slices |= dbuf_state->slices[pipe];
+
+	return enabled_slices;
+}
+
+static int
+skl_compute_ddb(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_dbuf_state *old_dbuf_state;
+	struct intel_dbuf_state *new_dbuf_state = NULL;
+	const struct intel_crtc_state *old_crtc_state;
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_crtc *crtc;
+	int ret, i;
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		new_dbuf_state = intel_atomic_get_dbuf_state(state);
+		if (IS_ERR(new_dbuf_state))
+			return PTR_ERR(new_dbuf_state);
+
+		old_dbuf_state = intel_atomic_get_old_dbuf_state(state);
+		break;
+	}
+
+	if (!new_dbuf_state)
+		return 0;
+
+	new_dbuf_state->active_pipes =
+		intel_calc_active_pipes(state, old_dbuf_state->active_pipes);
+
+	if (old_dbuf_state->active_pipes != new_dbuf_state->active_pipes) {
+		ret = intel_atomic_lock_global_state(&new_dbuf_state->base);
+		if (ret)
+			return ret;
+	}
+
+	if (HAS_MBUS_JOINING(i915))
+		new_dbuf_state->joined_mbus =
+			adlp_check_mbus_joined(new_dbuf_state->active_pipes);
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		enum pipe pipe = crtc->pipe;
+
+		new_dbuf_state->slices[pipe] =
+			skl_compute_dbuf_slices(crtc, new_dbuf_state->active_pipes,
+						new_dbuf_state->joined_mbus);
+
+		if (old_dbuf_state->slices[pipe] == new_dbuf_state->slices[pipe])
+			continue;
+
+		ret = intel_atomic_lock_global_state(&new_dbuf_state->base);
+		if (ret)
+			return ret;
+	}
+
+	new_dbuf_state->enabled_slices = intel_dbuf_enabled_slices(new_dbuf_state);
+
+	if (old_dbuf_state->enabled_slices != new_dbuf_state->enabled_slices ||
+	    old_dbuf_state->joined_mbus != new_dbuf_state->joined_mbus) {
+		ret = intel_atomic_serialize_global_state(&new_dbuf_state->base);
+		if (ret)
+			return ret;
+
+		if (old_dbuf_state->joined_mbus != new_dbuf_state->joined_mbus) {
+			/* TODO: Implement vblank synchronized MBUS joining changes */
+			ret = intel_modeset_all_pipes(state);
+			if (ret)
+				return ret;
+		}
+
+		drm_dbg_kms(&i915->drm,
+			    "Enabled dbuf slices 0x%x -> 0x%x (total dbuf slices 0x%x), mbus joined? %s->%s\n",
+			    old_dbuf_state->enabled_slices,
+			    new_dbuf_state->enabled_slices,
+			    INTEL_INFO(i915)->display.dbuf.slice_mask,
+			    str_yes_no(old_dbuf_state->joined_mbus),
+			    str_yes_no(new_dbuf_state->joined_mbus));
+	}
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		enum pipe pipe = crtc->pipe;
+
+		new_dbuf_state->weight[pipe] = intel_crtc_ddb_weight(new_crtc_state);
+
+		if (old_dbuf_state->weight[pipe] == new_dbuf_state->weight[pipe])
+			continue;
+
+		ret = intel_atomic_lock_global_state(&new_dbuf_state->base);
+		if (ret)
+			return ret;
+	}
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		ret = skl_crtc_allocate_ddb(state, crtc);
+		if (ret)
+			return ret;
+	}
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		ret = skl_crtc_allocate_plane_ddb(state, crtc);
+		if (ret)
+			return ret;
+
+		ret = skl_ddb_add_affected_planes(old_crtc_state,
+						  new_crtc_state);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static char enast(bool enable)
+{
+	return enable ? '*' : ' ';
+}
+
+static void
+skl_print_wm_changes(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_crtc_state *old_crtc_state;
+	const struct intel_crtc_state *new_crtc_state;
+	struct intel_plane *plane;
+	struct intel_crtc *crtc;
+	int i;
+
+	if (!drm_debug_enabled(DRM_UT_KMS))
+		return;
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		const struct skl_pipe_wm *old_pipe_wm, *new_pipe_wm;
+
+		old_pipe_wm = &old_crtc_state->wm.skl.optimal;
+		new_pipe_wm = &new_crtc_state->wm.skl.optimal;
+
+		for_each_intel_plane_on_crtc(&i915->drm, crtc, plane) {
+			enum plane_id plane_id = plane->id;
+			const struct skl_ddb_entry *old, *new;
+
+			old = &old_crtc_state->wm.skl.plane_ddb[plane_id];
+			new = &new_crtc_state->wm.skl.plane_ddb[plane_id];
+
+			if (skl_ddb_entry_equal(old, new))
+				continue;
+
+			drm_dbg_kms(&i915->drm,
+				    "[PLANE:%d:%s] ddb (%4d - %4d) -> (%4d - %4d), size %4d -> %4d\n",
+				    plane->base.base.id, plane->base.name,
+				    old->start, old->end, new->start, new->end,
+				    skl_ddb_entry_size(old), skl_ddb_entry_size(new));
+		}
+
+		for_each_intel_plane_on_crtc(&i915->drm, crtc, plane) {
+			enum plane_id plane_id = plane->id;
+			const struct skl_plane_wm *old_wm, *new_wm;
+
+			old_wm = &old_pipe_wm->planes[plane_id];
+			new_wm = &new_pipe_wm->planes[plane_id];
+
+			if (skl_plane_wm_equals(i915, old_wm, new_wm))
+				continue;
+
+			drm_dbg_kms(&i915->drm,
+				    "[PLANE:%d:%s]   level %cwm0,%cwm1,%cwm2,%cwm3,%cwm4,%cwm5,%cwm6,%cwm7,%ctwm,%cswm,%cstwm"
+				    " -> %cwm0,%cwm1,%cwm2,%cwm3,%cwm4,%cwm5,%cwm6,%cwm7,%ctwm,%cswm,%cstwm\n",
+				    plane->base.base.id, plane->base.name,
+				    enast(old_wm->wm[0].enable), enast(old_wm->wm[1].enable),
+				    enast(old_wm->wm[2].enable), enast(old_wm->wm[3].enable),
+				    enast(old_wm->wm[4].enable), enast(old_wm->wm[5].enable),
+				    enast(old_wm->wm[6].enable), enast(old_wm->wm[7].enable),
+				    enast(old_wm->trans_wm.enable),
+				    enast(old_wm->sagv.wm0.enable),
+				    enast(old_wm->sagv.trans_wm.enable),
+				    enast(new_wm->wm[0].enable), enast(new_wm->wm[1].enable),
+				    enast(new_wm->wm[2].enable), enast(new_wm->wm[3].enable),
+				    enast(new_wm->wm[4].enable), enast(new_wm->wm[5].enable),
+				    enast(new_wm->wm[6].enable), enast(new_wm->wm[7].enable),
+				    enast(new_wm->trans_wm.enable),
+				    enast(new_wm->sagv.wm0.enable),
+				    enast(new_wm->sagv.trans_wm.enable));
+
+			drm_dbg_kms(&i915->drm,
+				    "[PLANE:%d:%s]   lines %c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%4d"
+				      " -> %c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%3d,%c%4d\n",
+				    plane->base.base.id, plane->base.name,
+				    enast(old_wm->wm[0].ignore_lines), old_wm->wm[0].lines,
+				    enast(old_wm->wm[1].ignore_lines), old_wm->wm[1].lines,
+				    enast(old_wm->wm[2].ignore_lines), old_wm->wm[2].lines,
+				    enast(old_wm->wm[3].ignore_lines), old_wm->wm[3].lines,
+				    enast(old_wm->wm[4].ignore_lines), old_wm->wm[4].lines,
+				    enast(old_wm->wm[5].ignore_lines), old_wm->wm[5].lines,
+				    enast(old_wm->wm[6].ignore_lines), old_wm->wm[6].lines,
+				    enast(old_wm->wm[7].ignore_lines), old_wm->wm[7].lines,
+				    enast(old_wm->trans_wm.ignore_lines), old_wm->trans_wm.lines,
+				    enast(old_wm->sagv.wm0.ignore_lines), old_wm->sagv.wm0.lines,
+				    enast(old_wm->sagv.trans_wm.ignore_lines), old_wm->sagv.trans_wm.lines,
+				    enast(new_wm->wm[0].ignore_lines), new_wm->wm[0].lines,
+				    enast(new_wm->wm[1].ignore_lines), new_wm->wm[1].lines,
+				    enast(new_wm->wm[2].ignore_lines), new_wm->wm[2].lines,
+				    enast(new_wm->wm[3].ignore_lines), new_wm->wm[3].lines,
+				    enast(new_wm->wm[4].ignore_lines), new_wm->wm[4].lines,
+				    enast(new_wm->wm[5].ignore_lines), new_wm->wm[5].lines,
+				    enast(new_wm->wm[6].ignore_lines), new_wm->wm[6].lines,
+				    enast(new_wm->wm[7].ignore_lines), new_wm->wm[7].lines,
+				    enast(new_wm->trans_wm.ignore_lines), new_wm->trans_wm.lines,
+				    enast(new_wm->sagv.wm0.ignore_lines), new_wm->sagv.wm0.lines,
+				    enast(new_wm->sagv.trans_wm.ignore_lines), new_wm->sagv.trans_wm.lines);
+
+			drm_dbg_kms(&i915->drm,
+				    "[PLANE:%d:%s]  blocks %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%5d"
+				    " -> %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%5d\n",
+				    plane->base.base.id, plane->base.name,
+				    old_wm->wm[0].blocks, old_wm->wm[1].blocks,
+				    old_wm->wm[2].blocks, old_wm->wm[3].blocks,
+				    old_wm->wm[4].blocks, old_wm->wm[5].blocks,
+				    old_wm->wm[6].blocks, old_wm->wm[7].blocks,
+				    old_wm->trans_wm.blocks,
+				    old_wm->sagv.wm0.blocks,
+				    old_wm->sagv.trans_wm.blocks,
+				    new_wm->wm[0].blocks, new_wm->wm[1].blocks,
+				    new_wm->wm[2].blocks, new_wm->wm[3].blocks,
+				    new_wm->wm[4].blocks, new_wm->wm[5].blocks,
+				    new_wm->wm[6].blocks, new_wm->wm[7].blocks,
+				    new_wm->trans_wm.blocks,
+				    new_wm->sagv.wm0.blocks,
+				    new_wm->sagv.trans_wm.blocks);
+
+			drm_dbg_kms(&i915->drm,
+				    "[PLANE:%d:%s] min_ddb %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%5d"
+				    " -> %4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%4d,%5d\n",
+				    plane->base.base.id, plane->base.name,
+				    old_wm->wm[0].min_ddb_alloc, old_wm->wm[1].min_ddb_alloc,
+				    old_wm->wm[2].min_ddb_alloc, old_wm->wm[3].min_ddb_alloc,
+				    old_wm->wm[4].min_ddb_alloc, old_wm->wm[5].min_ddb_alloc,
+				    old_wm->wm[6].min_ddb_alloc, old_wm->wm[7].min_ddb_alloc,
+				    old_wm->trans_wm.min_ddb_alloc,
+				    old_wm->sagv.wm0.min_ddb_alloc,
+				    old_wm->sagv.trans_wm.min_ddb_alloc,
+				    new_wm->wm[0].min_ddb_alloc, new_wm->wm[1].min_ddb_alloc,
+				    new_wm->wm[2].min_ddb_alloc, new_wm->wm[3].min_ddb_alloc,
+				    new_wm->wm[4].min_ddb_alloc, new_wm->wm[5].min_ddb_alloc,
+				    new_wm->wm[6].min_ddb_alloc, new_wm->wm[7].min_ddb_alloc,
+				    new_wm->trans_wm.min_ddb_alloc,
+				    new_wm->sagv.wm0.min_ddb_alloc,
+				    new_wm->sagv.trans_wm.min_ddb_alloc);
+		}
+	}
+}
+
+static bool skl_plane_selected_wm_equals(struct intel_plane *plane,
+					 const struct skl_pipe_wm *old_pipe_wm,
+					 const struct skl_pipe_wm *new_pipe_wm)
+{
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	int level, max_level = ilk_wm_max_level(i915);
+
+	for (level = 0; level <= max_level; level++) {
+		/*
+		 * We don't check uv_wm as the hardware doesn't actually
+		 * use it. It only gets used for calculating the required
+		 * ddb allocation.
+		 */
+		if (!skl_wm_level_equals(skl_plane_wm_level(old_pipe_wm, plane->id, level),
+					 skl_plane_wm_level(new_pipe_wm, plane->id, level)))
+			return false;
+	}
+
+	if (HAS_HW_SAGV_WM(i915)) {
+		const struct skl_plane_wm *old_wm = &old_pipe_wm->planes[plane->id];
+		const struct skl_plane_wm *new_wm = &new_pipe_wm->planes[plane->id];
+
+		if (!skl_wm_level_equals(&old_wm->sagv.wm0, &new_wm->sagv.wm0) ||
+		    !skl_wm_level_equals(&old_wm->sagv.trans_wm, &new_wm->sagv.trans_wm))
+			return false;
+	}
+
+	return skl_wm_level_equals(skl_plane_trans_wm(old_pipe_wm, plane->id),
+				   skl_plane_trans_wm(new_pipe_wm, plane->id));
+}
+
+/*
+ * To make sure the cursor watermark registers are always consistent
+ * with our computed state the following scenario needs special
+ * treatment:
+ *
+ * 1. enable cursor
+ * 2. move cursor entirely offscreen
+ * 3. disable cursor
+ *
+ * Step 2. does call .disable_plane() but does not zero the watermarks
+ * (since we consider an offscreen cursor still active for the purposes
+ * of watermarks). Step 3. would not normally call .disable_plane()
+ * because the actual plane visibility isn't changing, and we don't
+ * deallocate the cursor ddb until the pipe gets disabled. So we must
+ * force step 3. to call .disable_plane() to update the watermark
+ * registers properly.
+ *
+ * Other planes do not suffer from this issues as their watermarks are
+ * calculated based on the actual plane visibility. The only time this
+ * can trigger for the other planes is during the initial readout as the
+ * default value of the watermarks registers is not zero.
+ */
+static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
+				      struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
+	struct intel_crtc_state *new_crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_plane *plane;
+
+	for_each_intel_plane_on_crtc(&i915->drm, crtc, plane) {
+		struct intel_plane_state *plane_state;
+		enum plane_id plane_id = plane->id;
+
+		/*
+		 * Force a full wm update for every plane on modeset.
+		 * Required because the reset value of the wm registers
+		 * is non-zero, whereas we want all disabled planes to
+		 * have zero watermarks. So if we turn off the relevant
+		 * power well the hardware state will go out of sync
+		 * with the software state.
+		 */
+		if (!drm_atomic_crtc_needs_modeset(&new_crtc_state->uapi) &&
+		    skl_plane_selected_wm_equals(plane,
+						 &old_crtc_state->wm.skl.optimal,
+						 &new_crtc_state->wm.skl.optimal))
+			continue;
+
+		plane_state = intel_atomic_get_plane_state(state, plane);
+		if (IS_ERR(plane_state))
+			return PTR_ERR(plane_state);
+
+		new_crtc_state->update_planes |= BIT(plane_id);
+	}
+
+	return 0;
+}
+
+static int
+skl_compute_wm(struct intel_atomic_state *state)
+{
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	int ret, i;
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		ret = skl_build_pipe_wm(state, crtc);
+		if (ret)
+			return ret;
+	}
+
+	ret = skl_compute_ddb(state);
+	if (ret)
+		return ret;
+
+	ret = intel_compute_sagv_mask(state);
+	if (ret)
+		return ret;
+
+	/*
+	 * skl_compute_ddb() will have adjusted the final watermarks
+	 * based on how much ddb is available. Now we can actually
+	 * check if the final watermarks changed.
+	 */
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		ret = skl_wm_add_affected_planes(state, crtc);
+		if (ret)
+			return ret;
+	}
+
+	skl_print_wm_changes(state);
+
+	return 0;
+}
+
+static void skl_wm_level_from_reg_val(u32 val, struct skl_wm_level *level)
+{
+	level->enable = val & PLANE_WM_EN;
+	level->ignore_lines = val & PLANE_WM_IGNORE_LINES;
+	level->blocks = REG_FIELD_GET(PLANE_WM_BLOCKS_MASK, val);
+	level->lines = REG_FIELD_GET(PLANE_WM_LINES_MASK, val);
+}
+
+static void skl_pipe_wm_get_hw_state(struct intel_crtc *crtc,
+				     struct skl_pipe_wm *out)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	enum pipe pipe = crtc->pipe;
+	int level, max_level;
+	enum plane_id plane_id;
+	u32 val;
+
+	max_level = ilk_wm_max_level(i915);
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		struct skl_plane_wm *wm = &out->planes[plane_id];
+
+		for (level = 0; level <= max_level; level++) {
+			if (plane_id != PLANE_CURSOR)
+				val = intel_uncore_read(&i915->uncore, PLANE_WM(pipe, plane_id, level));
+			else
+				val = intel_uncore_read(&i915->uncore, CUR_WM(pipe, level));
+
+			skl_wm_level_from_reg_val(val, &wm->wm[level]);
+		}
+
+		if (plane_id != PLANE_CURSOR)
+			val = intel_uncore_read(&i915->uncore, PLANE_WM_TRANS(pipe, plane_id));
+		else
+			val = intel_uncore_read(&i915->uncore, CUR_WM_TRANS(pipe));
+
+		skl_wm_level_from_reg_val(val, &wm->trans_wm);
+
+		if (HAS_HW_SAGV_WM(i915)) {
+			if (plane_id != PLANE_CURSOR)
+				val = intel_uncore_read(&i915->uncore,
+							PLANE_WM_SAGV(pipe, plane_id));
+			else
+				val = intel_uncore_read(&i915->uncore,
+							CUR_WM_SAGV(pipe));
+
+			skl_wm_level_from_reg_val(val, &wm->sagv.wm0);
+
+			if (plane_id != PLANE_CURSOR)
+				val = intel_uncore_read(&i915->uncore,
+							PLANE_WM_SAGV_TRANS(pipe, plane_id));
+			else
+				val = intel_uncore_read(&i915->uncore,
+							CUR_WM_SAGV_TRANS(pipe));
+
+			skl_wm_level_from_reg_val(val, &wm->sagv.trans_wm);
+		} else if (DISPLAY_VER(i915) >= 12) {
+			wm->sagv.wm0 = wm->wm[0];
+			wm->sagv.trans_wm = wm->trans_wm;
+		}
+	}
+}
+
+void skl_wm_get_hw_state(struct drm_i915_private *i915)
+{
+	struct intel_dbuf_state *dbuf_state =
+		to_intel_dbuf_state(i915->display.dbuf.obj.state);
+	struct intel_crtc *crtc;
+
+	if (HAS_MBUS_JOINING(i915))
+		dbuf_state->joined_mbus = intel_de_read(i915, MBUS_CTL) & MBUS_JOIN;
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		struct intel_crtc_state *crtc_state =
+			to_intel_crtc_state(crtc->base.state);
+		enum pipe pipe = crtc->pipe;
+		unsigned int mbus_offset;
+		enum plane_id plane_id;
+		u8 slices;
+
+		memset(&crtc_state->wm.skl.optimal, 0,
+		       sizeof(crtc_state->wm.skl.optimal));
+		if (crtc_state->hw.active)
+			skl_pipe_wm_get_hw_state(crtc, &crtc_state->wm.skl.optimal);
+		crtc_state->wm.skl.raw = crtc_state->wm.skl.optimal;
+
+		memset(&dbuf_state->ddb[pipe], 0, sizeof(dbuf_state->ddb[pipe]));
+
+		for_each_plane_id_on_crtc(crtc, plane_id) {
+			struct skl_ddb_entry *ddb =
+				&crtc_state->wm.skl.plane_ddb[plane_id];
+			struct skl_ddb_entry *ddb_y =
+				&crtc_state->wm.skl.plane_ddb_y[plane_id];
+
+			if (!crtc_state->hw.active)
+				continue;
+
+			skl_ddb_get_hw_plane_state(i915, crtc->pipe,
+						   plane_id, ddb, ddb_y);
+
+			skl_ddb_entry_union(&dbuf_state->ddb[pipe], ddb);
+			skl_ddb_entry_union(&dbuf_state->ddb[pipe], ddb_y);
+		}
+
+		dbuf_state->weight[pipe] = intel_crtc_ddb_weight(crtc_state);
+
+		/*
+		 * Used for checking overlaps, so we need absolute
+		 * offsets instead of MBUS relative offsets.
+		 */
+		slices = skl_compute_dbuf_slices(crtc, dbuf_state->active_pipes,
+						 dbuf_state->joined_mbus);
+		mbus_offset = mbus_ddb_offset(i915, slices);
+		crtc_state->wm.skl.ddb.start = mbus_offset + dbuf_state->ddb[pipe].start;
+		crtc_state->wm.skl.ddb.end = mbus_offset + dbuf_state->ddb[pipe].end;
+
+		/* The slices actually used by the planes on the pipe */
+		dbuf_state->slices[pipe] =
+			skl_ddb_dbuf_slice_mask(i915, &crtc_state->wm.skl.ddb);
+
+		drm_dbg_kms(&i915->drm,
+			    "[CRTC:%d:%s] dbuf slices 0x%x, ddb (%d - %d), active pipes 0x%x, mbus joined: %s\n",
+			    crtc->base.base.id, crtc->base.name,
+			    dbuf_state->slices[pipe], dbuf_state->ddb[pipe].start,
+			    dbuf_state->ddb[pipe].end, dbuf_state->active_pipes,
+			    str_yes_no(dbuf_state->joined_mbus));
+	}
+
+	dbuf_state->enabled_slices = i915->display.dbuf.enabled_slices;
+}
+
+static bool skl_dbuf_is_misconfigured(struct drm_i915_private *i915)
+{
+	const struct intel_dbuf_state *dbuf_state =
+		to_intel_dbuf_state(i915->display.dbuf.obj.state);
+	struct skl_ddb_entry entries[I915_MAX_PIPES] = {};
+	struct intel_crtc *crtc;
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		const struct intel_crtc_state *crtc_state =
+			to_intel_crtc_state(crtc->base.state);
+
+		entries[crtc->pipe] = crtc_state->wm.skl.ddb;
+	}
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		const struct intel_crtc_state *crtc_state =
+			to_intel_crtc_state(crtc->base.state);
+		u8 slices;
+
+		slices = skl_compute_dbuf_slices(crtc, dbuf_state->active_pipes,
+						 dbuf_state->joined_mbus);
+		if (dbuf_state->slices[crtc->pipe] & ~slices)
+			return true;
+
+		if (skl_ddb_allocation_overlaps(&crtc_state->wm.skl.ddb, entries,
+						I915_MAX_PIPES, crtc->pipe))
+			return true;
+	}
+
+	return false;
+}
+
+void skl_wm_sanitize(struct drm_i915_private *i915)
+{
+	struct intel_crtc *crtc;
+
+	/*
+	 * On TGL/RKL (at least) the BIOS likes to assign the planes
+	 * to the wrong DBUF slices. This will cause an infinite loop
+	 * in skl_commit_modeset_enables() as it can't find a way to
+	 * transition between the old bogus DBUF layout to the new
+	 * proper DBUF layout without DBUF allocation overlaps between
+	 * the planes (which cannot be allowed or else the hardware
+	 * may hang). If we detect a bogus DBUF layout just turn off
+	 * all the planes so that skl_commit_modeset_enables() can
+	 * simply ignore them.
+	 */
+	if (!skl_dbuf_is_misconfigured(i915))
+		return;
+
+	drm_dbg_kms(&i915->drm, "BIOS has misprogrammed the DBUF, disabling all planes\n");
+
+	for_each_intel_crtc(&i915->drm, crtc) {
+		struct intel_plane *plane = to_intel_plane(crtc->base.primary);
+		const struct intel_plane_state *plane_state =
+			to_intel_plane_state(plane->base.state);
+		struct intel_crtc_state *crtc_state =
+			to_intel_crtc_state(crtc->base.state);
+
+		if (plane_state->uapi.visible)
+			intel_plane_disable_noatomic(crtc, plane);
+
+		drm_WARN_ON(&i915->drm, crtc_state->active_planes != 0);
+
+		memset(&crtc_state->wm.skl.ddb, 0, sizeof(crtc_state->wm.skl.ddb));
+	}
+}
+
+void intel_wm_state_verify(struct intel_crtc *crtc,
+			   struct intel_crtc_state *new_crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	struct skl_hw_state {
+		struct skl_ddb_entry ddb[I915_MAX_PLANES];
+		struct skl_ddb_entry ddb_y[I915_MAX_PLANES];
+		struct skl_pipe_wm wm;
+	} *hw;
+	const struct skl_pipe_wm *sw_wm = &new_crtc_state->wm.skl.optimal;
+	int level, max_level = ilk_wm_max_level(i915);
+	struct intel_plane *plane;
+	u8 hw_enabled_slices;
+
+	if (DISPLAY_VER(i915) < 9 || !new_crtc_state->hw.active)
+		return;
+
+	hw = kzalloc(sizeof(*hw), GFP_KERNEL);
+	if (!hw)
+		return;
+
+	skl_pipe_wm_get_hw_state(crtc, &hw->wm);
+
+	skl_pipe_ddb_get_hw_state(crtc, hw->ddb, hw->ddb_y);
+
+	hw_enabled_slices = intel_enabled_dbuf_slices_mask(i915);
+
+	if (DISPLAY_VER(i915) >= 11 &&
+	    hw_enabled_slices != i915->display.dbuf.enabled_slices)
+		drm_err(&i915->drm,
+			"mismatch in DBUF Slices (expected 0x%x, got 0x%x)\n",
+			i915->display.dbuf.enabled_slices,
+			hw_enabled_slices);
+
+	for_each_intel_plane_on_crtc(&i915->drm, crtc, plane) {
+		const struct skl_ddb_entry *hw_ddb_entry, *sw_ddb_entry;
+		const struct skl_wm_level *hw_wm_level, *sw_wm_level;
+
+		/* Watermarks */
+		for (level = 0; level <= max_level; level++) {
+			hw_wm_level = &hw->wm.planes[plane->id].wm[level];
+			sw_wm_level = skl_plane_wm_level(sw_wm, plane->id, level);
+
+			if (skl_wm_level_equals(hw_wm_level, sw_wm_level))
+				continue;
+
+			drm_err(&i915->drm,
+				"[PLANE:%d:%s] mismatch in WM%d (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
+				plane->base.base.id, plane->base.name, level,
+				sw_wm_level->enable,
+				sw_wm_level->blocks,
+				sw_wm_level->lines,
+				hw_wm_level->enable,
+				hw_wm_level->blocks,
+				hw_wm_level->lines);
+		}
+
+		hw_wm_level = &hw->wm.planes[plane->id].trans_wm;
+		sw_wm_level = skl_plane_trans_wm(sw_wm, plane->id);
+
+		if (!skl_wm_level_equals(hw_wm_level, sw_wm_level)) {
+			drm_err(&i915->drm,
+				"[PLANE:%d:%s] mismatch in trans WM (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
+				plane->base.base.id, plane->base.name,
+				sw_wm_level->enable,
+				sw_wm_level->blocks,
+				sw_wm_level->lines,
+				hw_wm_level->enable,
+				hw_wm_level->blocks,
+				hw_wm_level->lines);
+		}
+
+		hw_wm_level = &hw->wm.planes[plane->id].sagv.wm0;
+		sw_wm_level = &sw_wm->planes[plane->id].sagv.wm0;
+
+		if (HAS_HW_SAGV_WM(i915) &&
+		    !skl_wm_level_equals(hw_wm_level, sw_wm_level)) {
+			drm_err(&i915->drm,
+				"[PLANE:%d:%s] mismatch in SAGV WM (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
+				plane->base.base.id, plane->base.name,
+				sw_wm_level->enable,
+				sw_wm_level->blocks,
+				sw_wm_level->lines,
+				hw_wm_level->enable,
+				hw_wm_level->blocks,
+				hw_wm_level->lines);
+		}
+
+		hw_wm_level = &hw->wm.planes[plane->id].sagv.trans_wm;
+		sw_wm_level = &sw_wm->planes[plane->id].sagv.trans_wm;
+
+		if (HAS_HW_SAGV_WM(i915) &&
+		    !skl_wm_level_equals(hw_wm_level, sw_wm_level)) {
+			drm_err(&i915->drm,
+				"[PLANE:%d:%s] mismatch in SAGV trans WM (expected e=%d b=%u l=%u, got e=%d b=%u l=%u)\n",
+				plane->base.base.id, plane->base.name,
+				sw_wm_level->enable,
+				sw_wm_level->blocks,
+				sw_wm_level->lines,
+				hw_wm_level->enable,
+				hw_wm_level->blocks,
+				hw_wm_level->lines);
+		}
+
+		/* DDB */
+		hw_ddb_entry = &hw->ddb[PLANE_CURSOR];
+		sw_ddb_entry = &new_crtc_state->wm.skl.plane_ddb[PLANE_CURSOR];
+
+		if (!skl_ddb_entry_equal(hw_ddb_entry, sw_ddb_entry)) {
+			drm_err(&i915->drm,
+				"[PLANE:%d:%s] mismatch in DDB (expected (%u,%u), found (%u,%u))\n",
+				plane->base.base.id, plane->base.name,
+				sw_ddb_entry->start, sw_ddb_entry->end,
+				hw_ddb_entry->start, hw_ddb_entry->end);
+		}
+	}
+
+	kfree(hw);
+}
+
+void intel_enable_ipc(struct drm_i915_private *i915)
+{
+	u32 val;
+
+	if (!HAS_IPC(i915))
+		return;
+
+	val = intel_uncore_read(&i915->uncore, DISP_ARB_CTL2);
+
+	if (i915->ipc_enabled)
+		val |= DISP_IPC_ENABLE;
+	else
+		val &= ~DISP_IPC_ENABLE;
+
+	intel_uncore_write(&i915->uncore, DISP_ARB_CTL2, val);
+}
+
+static bool intel_can_enable_ipc(struct drm_i915_private *i915)
+{
+	/* Display WA #0477 WaDisableIPC: skl */
+	if (IS_SKYLAKE(i915))
+		return false;
+
+	/* Display WA #1141: SKL:all KBL:all CFL */
+	if (IS_KABYLAKE(i915) ||
+	    IS_COFFEELAKE(i915) ||
+	    IS_COMETLAKE(i915))
+		return i915->dram_info.symmetric_memory;
+
+	return true;
+}
+
+void intel_init_ipc(struct drm_i915_private *i915)
+{
+	if (!HAS_IPC(i915))
+		return;
+
+	i915->ipc_enabled = intel_can_enable_ipc(i915);
+
+	intel_enable_ipc(i915);
+}
+
+static void
+adjust_wm_latency(struct drm_i915_private *i915,
+		  u16 wm[], int max_level, int read_latency)
+{
+	bool wm_lv_0_adjust_needed = i915->dram_info.wm_lv_0_adjust_needed;
+	int i, level;
+
+	/*
+	 * If a level n (n > 1) has a 0us latency, all levels m (m >= n)
+	 * need to be disabled. We make sure to sanitize the values out
+	 * of the punit to satisfy this requirement.
+	 */
+	for (level = 1; level <= max_level; level++) {
+		if (wm[level] == 0) {
+			for (i = level + 1; i <= max_level; i++)
+				wm[i] = 0;
+
+			max_level = level - 1;
+			break;
+		}
+	}
+
+	/*
+	 * WaWmMemoryReadLatency
+	 *
+	 * punit doesn't take into account the read latency so we need
+	 * to add proper adjustement to each valid level we retrieve
+	 * from the punit when level 0 response data is 0us.
+	 */
+	if (wm[0] == 0) {
+		for (level = 0; level <= max_level; level++)
+			wm[level] += read_latency;
+	}
+
+	/*
+	 * WA Level-0 adjustment for 16GB DIMMs: SKL+
+	 * If we could not get dimm info enable this WA to prevent from
+	 * any underrun. If not able to get Dimm info assume 16GB dimm
+	 * to avoid any underrun.
+	 */
+	if (wm_lv_0_adjust_needed)
+		wm[0] += 1;
+}
+
+static void mtl_read_wm_latency(struct drm_i915_private *i915, u16 wm[])
+{
+	struct intel_uncore *uncore = &i915->uncore;
+	int max_level = ilk_wm_max_level(i915);
+	u32 val;
+
+	val = intel_uncore_read(uncore, MTL_LATENCY_LP0_LP1);
+	wm[0] = REG_FIELD_GET(MTL_LATENCY_LEVEL_EVEN_MASK, val);
+	wm[1] = REG_FIELD_GET(MTL_LATENCY_LEVEL_ODD_MASK, val);
+
+	val = intel_uncore_read(uncore, MTL_LATENCY_LP2_LP3);
+	wm[2] = REG_FIELD_GET(MTL_LATENCY_LEVEL_EVEN_MASK, val);
+	wm[3] = REG_FIELD_GET(MTL_LATENCY_LEVEL_ODD_MASK, val);
+
+	val = intel_uncore_read(uncore, MTL_LATENCY_LP4_LP5);
+	wm[4] = REG_FIELD_GET(MTL_LATENCY_LEVEL_EVEN_MASK, val);
+	wm[5] = REG_FIELD_GET(MTL_LATENCY_LEVEL_ODD_MASK, val);
+
+	adjust_wm_latency(i915, wm, max_level, 6);
+}
+
+static void skl_read_wm_latency(struct drm_i915_private *i915, u16 wm[])
+{
+	int max_level = ilk_wm_max_level(i915);
+	int read_latency = DISPLAY_VER(i915) >= 12 ? 3 : 2;
+	int mult = IS_DG2(i915) ? 2 : 1;
+	u32 val;
+	int ret;
+
+	/* read the first set of memory latencies[0:3] */
+	val = 0; /* data0 to be programmed to 0 for first set */
+	ret = snb_pcode_read(&i915->uncore, GEN9_PCODE_READ_MEM_LATENCY, &val, NULL);
+	if (ret) {
+		drm_err(&i915->drm, "SKL Mailbox read error = %d\n", ret);
+		return;
+	}
+
+	wm[0] = (val & GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+	wm[1] = ((val >> GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT) &
+		 GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+	wm[2] = ((val >> GEN9_MEM_LATENCY_LEVEL_2_6_SHIFT) &
+		 GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+	wm[3] = ((val >> GEN9_MEM_LATENCY_LEVEL_3_7_SHIFT) &
+		 GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+
+	/* read the second set of memory latencies[4:7] */
+	val = 1; /* data0 to be programmed to 1 for second set */
+	ret = snb_pcode_read(&i915->uncore, GEN9_PCODE_READ_MEM_LATENCY, &val, NULL);
+	if (ret) {
+		drm_err(&i915->drm, "SKL Mailbox read error = %d\n", ret);
+		return;
+	}
+
+	wm[4] = (val & GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+	wm[5] = ((val >> GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT) &
+		 GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+	wm[6] = ((val >> GEN9_MEM_LATENCY_LEVEL_2_6_SHIFT) &
+		 GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+	wm[7] = ((val >> GEN9_MEM_LATENCY_LEVEL_3_7_SHIFT) &
+		 GEN9_MEM_LATENCY_LEVEL_MASK) * mult;
+
+	adjust_wm_latency(i915, wm, max_level, read_latency);
+}
+
+static void skl_setup_wm_latency(struct drm_i915_private *i915)
+{
+	if (DISPLAY_VER(i915) >= 14)
+		mtl_read_wm_latency(i915, i915->display.wm.skl_latency);
+	else
+		skl_read_wm_latency(i915, i915->display.wm.skl_latency);
+
+	intel_print_wm_latency(i915, "Gen9 Plane", i915->display.wm.skl_latency);
+}
+
+static const struct intel_wm_funcs skl_wm_funcs = {
+	.compute_global_watermarks = skl_compute_wm,
+};
+
+void skl_wm_init(struct drm_i915_private *i915)
+{
+	intel_sagv_init(i915);
+
+	skl_setup_wm_latency(i915);
+
+	i915->display.funcs.wm = &skl_wm_funcs;
+}
+
+static struct intel_global_state *intel_dbuf_duplicate_state(struct intel_global_obj *obj)
+{
+	struct intel_dbuf_state *dbuf_state;
+
+	dbuf_state = kmemdup(obj->state, sizeof(*dbuf_state), GFP_KERNEL);
+	if (!dbuf_state)
+		return NULL;
+
+	return &dbuf_state->base;
+}
+
+static void intel_dbuf_destroy_state(struct intel_global_obj *obj,
+				     struct intel_global_state *state)
+{
+	kfree(state);
+}
+
+static const struct intel_global_state_funcs intel_dbuf_funcs = {
+	.atomic_duplicate_state = intel_dbuf_duplicate_state,
+	.atomic_destroy_state = intel_dbuf_destroy_state,
+};
+
+struct intel_dbuf_state *
+intel_atomic_get_dbuf_state(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_global_state *dbuf_state;
+
+	dbuf_state = intel_atomic_get_global_obj_state(state, &i915->display.dbuf.obj);
+	if (IS_ERR(dbuf_state))
+		return ERR_CAST(dbuf_state);
+
+	return to_intel_dbuf_state(dbuf_state);
+}
+
+int intel_dbuf_init(struct drm_i915_private *i915)
+{
+	struct intel_dbuf_state *dbuf_state;
+
+	dbuf_state = kzalloc(sizeof(*dbuf_state), GFP_KERNEL);
+	if (!dbuf_state)
+		return -ENOMEM;
+
+	intel_atomic_global_obj_init(i915, &i915->display.dbuf.obj,
+				     &dbuf_state->base, &intel_dbuf_funcs);
+
+	return 0;
+}
+
+/*
+ * Configure MBUS_CTL and all DBUF_CTL_S of each slice to join_mbus state before
+ * update the request state of all DBUS slices.
+ */
+static void update_mbus_pre_enable(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	u32 mbus_ctl, dbuf_min_tracker_val;
+	enum dbuf_slice slice;
+	const struct intel_dbuf_state *dbuf_state =
+		intel_atomic_get_new_dbuf_state(state);
+
+	if (!HAS_MBUS_JOINING(i915))
+		return;
+
+	/*
+	 * TODO: Implement vblank synchronized MBUS joining changes.
+	 * Must be properly coordinated with dbuf reprogramming.
+	 */
+	if (dbuf_state->joined_mbus) {
+		mbus_ctl = MBUS_HASHING_MODE_1x4 | MBUS_JOIN |
+			MBUS_JOIN_PIPE_SELECT_NONE;
+		dbuf_min_tracker_val = DBUF_MIN_TRACKER_STATE_SERVICE(3);
+	} else {
+		mbus_ctl = MBUS_HASHING_MODE_2x2 |
+			MBUS_JOIN_PIPE_SELECT_NONE;
+		dbuf_min_tracker_val = DBUF_MIN_TRACKER_STATE_SERVICE(1);
+	}
+
+	intel_de_rmw(i915, MBUS_CTL,
+		     MBUS_HASHING_MODE_MASK | MBUS_JOIN |
+		     MBUS_JOIN_PIPE_SELECT_MASK, mbus_ctl);
+
+	for_each_dbuf_slice(i915, slice)
+		intel_de_rmw(i915, DBUF_CTL_S(slice),
+			     DBUF_MIN_TRACKER_STATE_SERVICE_MASK,
+			     dbuf_min_tracker_val);
+}
+
+void intel_dbuf_pre_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_dbuf_state *new_dbuf_state =
+		intel_atomic_get_new_dbuf_state(state);
+	const struct intel_dbuf_state *old_dbuf_state =
+		intel_atomic_get_old_dbuf_state(state);
+
+	if (!new_dbuf_state ||
+	    (new_dbuf_state->enabled_slices == old_dbuf_state->enabled_slices &&
+	     new_dbuf_state->joined_mbus == old_dbuf_state->joined_mbus))
+		return;
+
+	WARN_ON(!new_dbuf_state->base.changed);
+
+	update_mbus_pre_enable(state);
+	gen9_dbuf_slices_update(i915,
+				old_dbuf_state->enabled_slices |
+				new_dbuf_state->enabled_slices);
+}
+
+void intel_dbuf_post_plane_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_dbuf_state *new_dbuf_state =
+		intel_atomic_get_new_dbuf_state(state);
+	const struct intel_dbuf_state *old_dbuf_state =
+		intel_atomic_get_old_dbuf_state(state);
+
+	if (!new_dbuf_state ||
+	    (new_dbuf_state->enabled_slices == old_dbuf_state->enabled_slices &&
+	     new_dbuf_state->joined_mbus == old_dbuf_state->joined_mbus))
+		return;
+
+	WARN_ON(!new_dbuf_state->base.changed);
+
+	gen9_dbuf_slices_update(i915,
+				new_dbuf_state->enabled_slices);
+}
+
+void intel_mbus_dbox_update(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	const struct intel_dbuf_state *new_dbuf_state, *old_dbuf_state;
+	const struct intel_crtc_state *new_crtc_state;
+	const struct intel_crtc *crtc;
+	u32 val = 0;
+	int i;
+
+	if (DISPLAY_VER(i915) < 11)
+		return;
+
+	new_dbuf_state = intel_atomic_get_new_dbuf_state(state);
+	old_dbuf_state = intel_atomic_get_old_dbuf_state(state);
+	if (!new_dbuf_state ||
+	    (new_dbuf_state->joined_mbus == old_dbuf_state->joined_mbus &&
+	     new_dbuf_state->active_pipes == old_dbuf_state->active_pipes))
+		return;
+
+	if (DISPLAY_VER(i915) >= 12) {
+		val |= MBUS_DBOX_B2B_TRANSACTIONS_MAX(16);
+		val |= MBUS_DBOX_B2B_TRANSACTIONS_DELAY(1);
+		val |= MBUS_DBOX_REGULATE_B2B_TRANSACTIONS_EN;
+	}
+
+	/* Wa_22010947358:adl-p */
+	if (IS_ALDERLAKE_P(i915))
+		val |= new_dbuf_state->joined_mbus ? MBUS_DBOX_A_CREDIT(6) :
+						     MBUS_DBOX_A_CREDIT(4);
+	else
+		val |= MBUS_DBOX_A_CREDIT(2);
+
+	if (IS_ALDERLAKE_P(i915)) {
+		val |= MBUS_DBOX_BW_CREDIT(2);
+		val |= MBUS_DBOX_B_CREDIT(8);
+	} else if (DISPLAY_VER(i915) >= 12) {
+		val |= MBUS_DBOX_BW_CREDIT(2);
+		val |= MBUS_DBOX_B_CREDIT(12);
+	} else {
+		val |= MBUS_DBOX_BW_CREDIT(1);
+		val |= MBUS_DBOX_B_CREDIT(8);
+	}
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		if (!new_crtc_state->hw.active ||
+		    !intel_crtc_needs_modeset(new_crtc_state))
+			continue;
+
+		intel_de_write(i915, PIPE_MBUS_DBOX_CTL(crtc->pipe), val);
+	}
+}