Looking at handle_cursor_update, it doesn't seem like src_{x,y,w,h}
are picked up by DC. I also tried to change these parameters via a
test KMS client, and amdgpu ignored them. Instead of displaying the
wrong result, reject the atomic commit.

Signed-off-by: Simon Ser <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Harry Wentland <[email protected]>
Cc: Nicholas Kazlauskas <[email protected]>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 ++++++++++
 1 file changed, 10 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 bd63f1c4ae79..a7e1af7081cb 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -8902,6 +8902,11 @@ static int dm_update_plane_state(struct dc *dc,
                        return -EINVAL;
                }
 
+               if (new_plane_state->src_x != 0 || new_plane_state->src_y != 0) 
{
+                       DRM_DEBUG_ATOMIC("Cropping not supported for cursor 
plane\n");
+                       return -EINVAL;
+               }
+
                if (new_plane_state->fb) {
                        if (new_plane_state->fb->width > 
new_acrtc->max_cursor_width ||
                            new_plane_state->fb->height > 
new_acrtc->max_cursor_height) {
@@ -8910,6 +8915,11 @@ static int dm_update_plane_state(struct dc *dc,
                                                 new_plane_state->fb->height);
                                return -EINVAL;
                        }
+                       if (new_plane_state->src_w != 
new_plane_state->fb->width << 16 ||
+                           new_plane_state->src_h != 
new_plane_state->fb->height << 16) {
+                               DRM_DEBUG_ATOMIC("Cropping not supported for 
cursor plane\n");
+                               return -EINVAL;
+                       }
 
                        switch (new_plane_state->fb->width) {
                        case 64:
-- 
2.29.2


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