[PATCH v6 5/7] drm/i915: Add dedicated plane hook for async flip case

[Karthik B S]

This hook is added to avoid writing other plane registers in case of
async flips, so that we do not write the double buffered registers
during async surface address update.

Signed-off-by: Karthik B S <karthik.b.s at intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 drivers/gpu/drm/i915/display/intel_sprite.c | 25 +++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
index 2b2d96c59d7f..1c03546a4d2a 100644
--- a/drivers/gpu/drm/i915/display/intel_sprite.c
+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
@@ -609,6 +609,24 @@ icl_program_input_csc(struct intel_plane *plane,
 			  PLANE_INPUT_CSC_POSTOFF(pipe, plane_id, 2), 0x0);
 }
 
+static void
+skl_program_async_surface_address(struct drm_i915_private *dev_priv,
+				  const struct intel_plane_state *plane_state,
+				  enum pipe pipe, enum plane_id plane_id,
+				  u32 surf_addr)
+{
+	unsigned long irqflags;
+	u32 plane_ctl = plane_state->ctl;
+
+	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
+
+	intel_de_write_fw(dev_priv, PLANE_CTL(pipe, plane_id), plane_ctl);
+	intel_de_write_fw(dev_priv, PLANE_SURF(pipe, plane_id),
+			  intel_plane_ggtt_offset(plane_state) + surf_addr);
+
+	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
+}
+
 static void
 skl_program_plane(struct intel_plane *plane,
 		  const struct intel_crtc_state *crtc_state,
@@ -637,6 +655,13 @@ skl_program_plane(struct intel_plane *plane,
 	u32 keymsk, keymax;
 	u32 plane_ctl = plane_state->ctl;
 
+	/* During Async flip, no other updates are allowed */
+	if (crtc_state->uapi.async_flip) {
+		skl_program_async_surface_address(dev_priv, plane_state,
+						  pipe, plane_id, surf_addr);
+		return;
+	}
+
 	plane_ctl |= skl_plane_ctl_crtc(crtc_state);
 
 	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
-- 
2.22.0