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, 8 insertions, 7 deletions

diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 78da9e346435..83ee686772ec 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -598,8 +598,8 @@ static u32 skl_plane_stride(const struct intel_plane_state *plane_state,
 }
 
 static void
-skl_disable_plane(struct intel_plane *plane,
-		  const struct intel_crtc_state *crtc_state)
+skl_plane_disable_arm(struct intel_plane *plane,
+		      const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	enum plane_id plane_id = plane->id;
@@ -1155,10 +1155,11 @@ skl_plane_async_flip(struct intel_plane *plane,
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
 
+/* TODO: split into noarm+arm pair */
 static void
-skl_update_plane(struct intel_plane *plane,
-		 const struct intel_crtc_state *crtc_state,
-		 const struct intel_plane_state *plane_state)
+skl_plane_update_arm(struct intel_plane *plane,
+		     const struct intel_crtc_state *crtc_state,
+		     const struct intel_plane_state *plane_state)
 {
 	int color_plane = 0;
 
@@ -2093,8 +2094,8 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
 	}
 
 	plane->max_stride = skl_plane_max_stride;
-	plane->update_plane = skl_update_plane;
-	plane->disable_plane = skl_disable_plane;
+	plane->update_arm = skl_plane_update_arm;
+	plane->disable_arm = skl_plane_disable_arm;
 	plane->get_hw_state = skl_plane_get_hw_state;
 	plane->check_plane = skl_plane_check;