drm/i915/gen11: Link nv12 Y and UV planes in the atomic state, v5.

To make NV12 working on icl, we need to update 2 planes simultaneously.
I've chosen to do this in the CRTC step after plane validation is done,
so we know what planes are (in)visible. The linked Y plane will get
updated in intel_plane_update_planes_on_crtc(), by the call to
update_slave, which gets the master's plane_state as argument.

The link requires both planes for atomic_update to work,
so make sure skl_ddb_add_affected_planes() adds both states.

Changes since v1:
- Introduce icl_is_nv12_y_plane(), instead of hardcoding sprite numbers.
- Put all the state updating login in intel_plane_atomic_check_with_state().
- Clean up changes in intel_plane_atomic_check().
Changes since v2:
- Fix intel_atomic_get_old_plane_state() to actually return old state.
- Move visibility changes to preparation patch.
- Only try to find a Y plane on gen11, earlier platforms only require
  a single plane.
Changes since v3:
- Fix checkpatch warning about to_intel_crtc() usage.
- Add affected planes from icl_add_linked_planes() before check_planes(),
  it's a cleaner way to do this. (Ville)
Changes since v4:
- Clear plane links in icl_check_nv12_planes() for clarity.
- Only pass crtc_state to icl_check_nv12_planes().
- Use for_each_new_intel_plane_in_state() in icl_check_nv12_planes.
- Rename aux to linked. (Ville)

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181022135152.15324-1-maarten.lankhorst@linux.intel.com
[mlankhorst: Change bool slave to u32, to satisfy checkpatch]
[mlankhorst: Add WARN_ON's based on Ville's suggestion]

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f42b8c319046..9ba39a9c7d1c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5153,11 +5153,12 @@ skl_ddb_add_affected_planes(struct intel_crtc_state *cstate)
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct skl_ddb_allocation *new_ddb = &intel_state->wm_results.ddb;
 	struct skl_ddb_allocation *cur_ddb = &dev_priv->wm.skl_hw.ddb;
-	struct drm_plane_state *plane_state;
 	struct drm_plane *plane;
 	enum pipe pipe = intel_crtc->pipe;
 
 	drm_for_each_plane_mask(plane, dev, cstate->base.plane_mask) {
+		struct drm_plane_state *plane_state;
+		struct intel_plane *linked;
 		enum plane_id plane_id = to_intel_plane(plane)->id;
 
 		if (skl_ddb_entry_equal(&cur_ddb->plane[pipe][plane_id],
@@ -5169,6 +5170,15 @@ skl_ddb_add_affected_planes(struct intel_crtc_state *cstate)
 		plane_state = drm_atomic_get_plane_state(state, plane);
 		if (IS_ERR(plane_state))
 			return PTR_ERR(plane_state);
+
+		/* Make sure linked plane is updated too */
+		linked = to_intel_plane_state(plane_state)->linked_plane;
+		if (!linked)
+			continue;
+
+		plane_state = drm_atomic_get_plane_state(state, &linked->base);
+		if (IS_ERR(plane_state))
+			return PTR_ERR(plane_state);
 	}
 
 	return 0;