[RFC PATCH] drm/amdgpu: Enable async flip for cursor planes

[Christopher Snowhill <kode54@gmail.com>]

From: Christopher Snowhill <chris@kode54.net>

amdgpu apparently fudges atomic flips if some software is also tweaking
the cursor planes during flips, which results in lovely fallback to non-
atomic flips.

Fixes: 41129e236f14 ("drm/amdgpu: Enable async flip on overlay planes")
Signed-off-by: Christopher Snowhill <chris@kode54.net>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

 Is there some reason why this was decided to be this way? I see it
 hasn't changed much since 2018, until the addition of overlay
 plane checking.

 Re: https://gitlab.freedesktop.org/drm/amd/-/issues/4263

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index b7c6e8d13435..f0c98d67e1f3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -1268,7 +1268,8 @@ static int amdgpu_dm_plane_atomic_async_check(struct drm_plane *plane,
 	struct dm_crtc_state *dm_new_crtc_state;
 
 	if (flip) {
-		if (plane->type != DRM_PLANE_TYPE_OVERLAY)
+		if (plane->type != DRM_PLANE_TYPE_OVERLAY &&
+		    plane->type != DRM_PLANE_TYPE_CURSOR)
 			return -EINVAL;
 	} else if (plane->type != DRM_PLANE_TYPE_CURSOR) {
 		return -EINVAL;
-- 
2.50.0