[PATCH] drm/i915: provide more error output when mode sets fail

[Jesse Barnes <jbarnes@virtuousgeek.org>]

If a mode set fails we may get a message from drm_crtc_helper if we're lucky,
but it won't tell us anything about *why* we failed to set a mode.  So
add a few DRM_ERRORs for the cases that shouldn't happen so we can debug
things more easily.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_display.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0f1c799..2434441 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1934,7 +1934,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 
 	/* no fb bound */
 	if (!crtc->fb) {
-		DRM_DEBUG_KMS("No FB bound\n");
+		DRM_ERROR("No FB bound\n");
 		return 0;
 	}
 
@@ -1943,6 +1943,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 	case 1:
 		break;
 	default:
+		DRM_ERROR("no plane for crtc\n");
 		return -EINVAL;
 	}
 
@@ -1952,6 +1953,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 					 NULL);
 	if (ret != 0) {
 		mutex_unlock(&dev->struct_mutex);
+		DRM_ERROR("pin & fence failed\n");
 		return ret;
 	}
 
@@ -1980,6 +1982,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
 	if (ret) {
 		i915_gem_object_unpin(to_intel_framebuffer(crtc->fb)->obj);
 		mutex_unlock(&dev->struct_mutex);
+		DRM_ERROR("failed to update base address\n");
 		return ret;
 	}
 
-- 
1.7.1