drm/i915: Split update_plane() into update_noarm() + update_arm()

The amount of plane registers we have to write has been steadily
increasing, putting more pressure on the vblank evasion mechanism
and forcing us to increase its time budget. Let's try to take some
of the pressure off by splitting plane updates into two parts:
1) write all non-self arming plane registers, ie. the registers
   where the write actually does nothing until a separate arming
   register is also written which will cause the hardware to latch
   the new register values at the next start of vblank
2) write all self arming plane registers, ie. registers which always
   just latch at the next start of vblank, and registers which also
   arm other registers to do so

Here we just provide the mechanism, but don't actually implement
the split on any platform yet. so everything stays now in the _arm()
hooks. Subsequently we can move a whole bunch of stuff into the
_noarm() part, especially in more modern platforms where the number
of registers we have to write is also the greatest. On older
platforms this is less beneficial probably, but no real reason
to deviate from a common behaviour.

And let's sprinkle some TODOs around the areas that will need
adapting.

Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018115030.3547-5-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

1 files changed, 24 insertions, 20 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_cursor.c b/drivers/gpu/drm/i915/display/intel_cursor.c
index e069a3fb8b99..16d34685d83f 100644
--- a/drivers/gpu/drm/i915/display/intel_cursor.c
+++ b/drivers/gpu/drm/i915/display/intel_cursor.c
@@ -248,9 +248,10 @@ static int i845_check_cursor(struct intel_crtc_state *crtc_state,
 	return 0;
 }
 
-static void i845_update_cursor(struct intel_plane *plane,
-			       const struct intel_crtc_state *crtc_state,
-			       const struct intel_plane_state *plane_state)
+/* TODO: split into noarm+arm pair */
+static void i845_cursor_update_arm(struct intel_plane *plane,
+				   const struct intel_crtc_state *crtc_state,
+				   const struct intel_plane_state *plane_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	u32 cntl = 0, base = 0, pos = 0, size = 0;
@@ -293,10 +294,10 @@ static void i845_update_cursor(struct intel_plane *plane,
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
-static void i845_disable_cursor(struct intel_plane *plane,
-				const struct intel_crtc_state *crtc_state)
+static void i845_cursor_disable_arm(struct intel_plane *plane,
+				    const struct intel_crtc_state *crtc_state)
 {
-	i845_update_cursor(plane, crtc_state, NULL);
+	i845_cursor_update_arm(plane, crtc_state, NULL);
 }
 
 static bool i845_cursor_get_hw_state(struct intel_plane *plane,
@@ -483,9 +484,10 @@ static int i9xx_check_cursor(struct intel_crtc_state *crtc_state,
 	return 0;
 }
 
-static void i9xx_update_cursor(struct intel_plane *plane,
-			       const struct intel_crtc_state *crtc_state,
-			       const struct intel_plane_state *plane_state)
+/* TODO: split into noarm+arm pair */
+static void i9xx_cursor_update_arm(struct intel_plane *plane,
+				   const struct intel_crtc_state *crtc_state,
+				   const struct intel_plane_state *plane_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	enum pipe pipe = plane->pipe;
@@ -557,10 +559,10 @@ static void i9xx_update_cursor(struct intel_plane *plane,
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
-static void i9xx_disable_cursor(struct intel_plane *plane,
-				const struct intel_crtc_state *crtc_state)
+static void i9xx_cursor_disable_arm(struct intel_plane *plane,
+				    const struct intel_crtc_state *crtc_state)
 {
-	i9xx_update_cursor(plane, crtc_state, NULL);
+	i9xx_cursor_update_arm(plane, crtc_state, NULL);
 }
 
 static bool i9xx_cursor_get_hw_state(struct intel_plane *plane,
@@ -714,10 +716,12 @@ intel_legacy_cursor_update(struct drm_plane *_plane,
 	 */
 	crtc_state->active_planes = new_crtc_state->active_planes;
 
-	if (new_plane_state->uapi.visible)
-		intel_update_plane(plane, crtc_state, new_plane_state);
-	else
-		intel_disable_plane(plane, crtc_state);
+	if (new_plane_state->uapi.visible) {
+		intel_plane_update_noarm(plane, crtc_state, new_plane_state);
+		intel_plane_update_arm(plane, crtc_state, new_plane_state);
+	} else {
+		intel_plane_disable_arm(plane, crtc_state);
+	}
 
 	intel_plane_unpin_fb(old_plane_state);
 
@@ -764,14 +768,14 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv,
 
 	if (IS_I845G(dev_priv) || IS_I865G(dev_priv)) {
 		cursor->max_stride = i845_cursor_max_stride;
-		cursor->update_plane = i845_update_cursor;
-		cursor->disable_plane = i845_disable_cursor;
+		cursor->update_arm = i845_cursor_update_arm;
+		cursor->disable_arm = i845_cursor_disable_arm;
 		cursor->get_hw_state = i845_cursor_get_hw_state;
 		cursor->check_plane = i845_check_cursor;
 	} else {
 		cursor->max_stride = i9xx_cursor_max_stride;
-		cursor->update_plane = i9xx_update_cursor;
-		cursor->disable_plane = i9xx_disable_cursor;
+		cursor->update_arm = i9xx_cursor_update_arm;
+		cursor->disable_arm = i9xx_cursor_disable_arm;
 		cursor->get_hw_state = i9xx_cursor_get_hw_state;
 		cursor->check_plane = i9xx_check_cursor;
 	}