[PATCH 4/4] drm/i915/display: debug log about fence wait errors

[Jani Nikula <jani.nikula@intel.com>]

Currently there's no indication if fence wait failed. Debug log about
it.

v2: Rebase, no timeout anymore

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 983e84bca1ee..edaa29944d23 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7290,6 +7290,7 @@ static void skl_commit_modeset_enables(struct intel_atomic_state *state)
 
 static void intel_atomic_commit_fence_wait(struct intel_atomic_state *state)
 {
+	struct intel_display *display = to_intel_display(state);
 	struct drm_plane *plane;
 	struct drm_plane_state *new_plane_state;
 	long ret;
@@ -7300,8 +7301,11 @@ static void intel_atomic_commit_fence_wait(struct intel_atomic_state *state)
 			continue;
 
 		ret = dma_fence_wait(new_plane_state->fence, false);
-		if (ret < 0)
+		if (ret < 0) {
+			drm_dbg_kms(display->drm, "[PLANE:%d:%s] fence wait failed (%pe)\n",
+				    plane->base.id, plane->name, ERR_PTR(ret));
 			break;
+		}
 
 		dma_fence_put(new_plane_state->fence);
 		new_plane_state->fence = NULL;
-- 
2.47.3