[RFC PATCH 33/40] drm/amd/display: reject atomic commit if setting both plane and CRTC degamma

[Melissa Wen]

DC only has pre-blending degamma caps (pre-blending/DPP) that is
currently in use for CRTC/post-blending degamma, so that we don't have
HW caps to perform plane and CRTC degamma at the same time. Reject
atomic updates when serspace sets both plane and CRTC degamma
properties.

Signed-off-by: Melissa Wen <mwen at igalia.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
index 693168cc1d9c..07303c9f3618 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -949,6 +949,17 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
 	if (ret != -EINVAL)
 		return ret;
 
+	/* We only have one degamma block available (pre-blending) for the
+	 * whole color correction pipeline, so that we can't actually perform
+	 * plane and CRTC degamma at the same time. Reject atomic updates when
+	 * userspace sets both plane and CRTC degamma properties.
+	 */
+	if (has_crtc_cm_degamma && ret == -EINVAL){
+		drm_dbg_kms(crtc->base.crtc->dev,
+			    "doesn't support plane and CRTC degamma at the same time\n");
+			return -EINVAL;
+	}
+
 	/* As we don't have plane degamma, check if we have CRTC degamma
 	 * waiting for mapping to pre-blending degamma block */
 #endif
-- 
2.39.2