[PATCH v4 17/25] drm/msm/dpu: Fail atomic_check if CWB and CDM are enabled

[Jessica Zhang]

We cannot support both CWB and CDM simultaneously as this would require
2 CDM blocks and currently our hardware only supports 1 CDM block at
most.

Thus return an error if both CWB and CDM are enabled.

Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 9bb920d28bae2706b3892c167fe2bec3fd8857f4..a6372eee916e8aba702bbefc3615d8882ddcaad9 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1261,6 +1261,10 @@ static int dpu_crtc_assign_resources(struct drm_crtc *crtc, struct drm_crtc_stat
 		return 0;
 
 	topology = dpu_crtc_get_topology(crtc, dpu_kms, crtc_state);
+
+	if (topology.cwb_enabled && topology.needs_cdm)
+		return -EINVAL;
+
 	ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
 			     crtc, &topology);
 	if (ret)

-- 
2.34.1