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

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>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b5b15bd..261ffe4 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2096,7 +2096,7 @@ 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;
        }
 
@@ -2105,6 +2105,7 @@ 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;
        }
 
@@ -2114,6 +2115,7 @@ 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;
        }
 
@@ -2142,6 +2144,7 @@ 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;
        }