[PATCH 01/26] drm/amd/display: Reset alpha state for planes to the correct values

[Bhawanpreet Lakha]

From: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

[Why]
The plane_reset callback is subclassed but hasn't been updated since
the drm helper got updated to include resetting alpha related state
(state->alpha and state->pixel_blend_mode). The overlay planes
exposed by amdgpu_dm were therefore being rendered as invisible by
default ever since supported was exposed for alpha blending properties
on overlays.

This caused regressions in igt at kms_plane_multiple@atomic-tiling-none
and igt at kms_plane@plane-position-covered-pipe tests.

[How]
Reset the plane state values to their correct values as defined in
the drm helper.

This fixes the IGT test regression.

Change-Id: I4ebfad24456f8a898cd36394e769a0d216549e92
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 5f1e23ba75e1..01fa77858d9d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3748,6 +3748,8 @@ static void dm_drm_plane_reset(struct drm_plane *plane)
 		plane->state = &amdgpu_state->base;
 		plane->state->plane = plane;
 		plane->state->rotation = DRM_MODE_ROTATE_0;
+		plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE;
+		plane->state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
 	}
 }
 
-- 
2.17.1