drm/i915: add debug logging to ASLE backlight set requests

Make it easier to track backlight set requests coming through ASLE instead
of the driver's own backlight sysfs interface. We've had enough of
backlight issues to warrant some extra debug logs in the area.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index e27c17012628..0f2db1648f04 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -154,6 +154,8 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
         struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
         u32 max;
 
+        DRM_DEBUG_DRIVER("bclp = 0x%08x\n", bclp);
+
         if (!(bclp & ASLE_BCLP_VALID))
                 return ASLE_BACKLIGHT_FAILED;