[Intel-gfx] [PATCH] drm/i915: clear plane color ctl setting when turn full plane off

[Lee Shawn C]

Customer report abnormal display output while switch eDP off sometimes.
In current display disable flow, plane will be off at first. Then turn
eDP off and disable HW pipe line. We found the abnormal pixel comes
after turn plane off. Clear plane color ctl register when driver disable
plane can solve this symptom.

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Shankar Uma <uma.shankar at intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
Cc: William Tseng <william.tseng at intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee at intel.com>
---
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index caa03324a733..90977cfb7ebb 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -620,6 +620,8 @@ skl_plane_disable_arm(struct intel_plane *plane,
 
 	intel_de_write_fw(dev_priv, PLANE_CTL(pipe, plane_id), 0);
 	intel_de_write_fw(dev_priv, PLANE_SURF(pipe, plane_id), 0);
+	if (DISPLAY_VER(dev_priv) >= 10)
+		intel_de_write_fw(dev_priv, PLANE_COLOR_CTL(pipe, plane_id), 0);
 }
 
 static void
@@ -638,6 +640,7 @@ icl_plane_disable_arm(struct intel_plane *plane,
 	intel_psr2_disable_plane_sel_fetch(plane, crtc_state);
 	intel_de_write_fw(dev_priv, PLANE_CTL(pipe, plane_id), 0);
 	intel_de_write_fw(dev_priv, PLANE_SURF(pipe, plane_id), 0);
+	intel_de_write_fw(dev_priv, PLANE_COLOR_CTL(pipe, plane_id), 0);
 }
 
 static bool
-- 
2.17.1