[PATCH] drm/damage_helper: Fix handling of cursor dirty buffers

[José Roberto de Souza]

Cursors don't have a framebuffer so the fb comparisson was always
failing and atomic state was being committed without any plane state.

So here checking if objects match when checking cursors.

Fixes: b9fc5e01d1ce ("drm: Add helper to implement legacy dirtyfb")
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Rob Clark <robdclark at gmail.com>
Cc: Deepak Rawat <drawat at vmware.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/drm_damage_helper.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_damage_helper.c b/drivers/gpu/drm/drm_damage_helper.c
index 8eeff0c7bdd47..595187d97c131 100644
--- a/drivers/gpu/drm/drm_damage_helper.c
+++ b/drivers/gpu/drm/drm_damage_helper.c
@@ -157,12 +157,18 @@ int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb,
 retry:
 	drm_for_each_plane(plane, fb->dev) {
 		struct drm_plane_state *plane_state;
+		bool match;
 
 		ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
 		if (ret)
 			goto out;
 
-		if (plane->state->fb != fb) {
+		match = plane->state->fb == fb;
+		/* Check if objs match to handle dirty buffers of cursors */
+		if (plane->type == DRM_PLANE_TYPE_CURSOR && plane->state->fb)
+			match |= fb->obj[0] == plane->state->fb->obj[0];
+
+		if (!match) {
 			drm_modeset_unlock(&plane->mutex);
 			continue;
 		}
-- 
2.32.0