[PATCH] drm/amd/display: Add all planes on CRTC to state for overlay cursor

[sunpeng.li at amd.com]

From: Leo Li <sunpeng.li at amd.com>

[Why]

DC has a special commit path for native cursor, which use the built-in
cursor pipe within DCN planes. This update path does not require all
enabled planes to be added to the list of surface updates sent to DC.

This is not the case for overlay cursor; it uses the same path as MPO
commits. This update path requires all enabled planes to be added to the
list of surface updates sent to DC. Otherwise, DC will disable planes
not inside the list.

[How]

If overlay cursor is needed, add all planes on the same CRTC as this
cursor to the atomic state. This is already done for non-cursor planes
(MPO), just before the added lines.

Fixes: 1b04dcca4fb1 ("drm/amd/display: Introduce overlay cursor mode")
Closes: https://lore.kernel.org/lkml/f68020a3-c413-482d-beb2-5432d98a1d3e@amd.com
Signed-off-by: Leo Li <sunpeng.li at amd.com>
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov at gmail.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 11 +++++++++++
 1 file changed, 11 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 a3edaf658ae00..6b5baa3e20c49 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -11427,6 +11427,17 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 			drm_dbg(dev, "Failed to determine cursor mode\n");
 			goto fail;
 		}
+
+		/*
+		 * If overlay cursor is needed, DC cannot go through the
+		 * native cursor update path. All enabled planes on the CRTC
+		 * need to be added for DC to not disable a plane by mistake
+		 */
+		if (dm_new_crtc_state->cursor_mode == DM_CURSOR_OVERLAY_MODE) {
+			ret = drm_atomic_add_affected_planes(state, crtc);
+			if (ret)
+				goto fail;
+		}
 	}
 
 	/* Remove exiting planes if they are modified */
-- 
2.46.0