[PATCH v2 3/3] drm/bridge: log message on atomic_check() and mode_fixup() failure

[Simon Ser]

This helps user-space understand why an atomic commit fails.

v2: new patch

Signed-off-by: Simon Ser <cont...@emersion.fr>
---
 drivers/gpu/drm/drm_bridge.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 1545c50fd1c8..c41c728b0c28 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -830,12 +830,26 @@ static int drm_atomic_bridge_check(struct drm_bridge 
*bridge,
 
                ret = bridge->funcs->atomic_check(bridge, bridge_state,
                                                  crtc_state, conn_state);
-               if (ret)
+               if (ret) {
+                       drm_dbg_atomic(bridge->dev,
+                                      "bridge driver check failed for 
[CRTC:%d:%s] and [CONNECTOR:%d:%s]\n",
+                                      crtc_state->crtc->base.id,
+                                      crtc_state->crtc->name,
+                                      conn_state->connector->base.id,
+                                      conn_state->connector->name);
                        return ret;
+               }
        } else if (bridge->funcs->mode_fixup) {
                if (!bridge->funcs->mode_fixup(bridge, &crtc_state->mode,
-                                              &crtc_state->adjusted_mode))
+                                              &crtc_state->adjusted_mode)) {
+                       drm_dbg_atomic(bridge->dev,
+                                      "bridge mode fixup failed for 
[CRTC:%d:%s] and [CONNECTOR:%d:%s]\n",
+                                      crtc_state->crtc->base.id,
+                                      crtc_state->crtc->name,
+                                      conn_state->connector->base.id,
+                                      conn_state->connector->name);
                        return -EINVAL;
+               }
        }
 
        return 0;
-- 
2.37.2