[Intel-gfx] [PATCH] drm/i915: add debug logging to ASLE backlight set requests

[Jani Nikula]

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 at intel.com>

---

I thought I'd sent this a while back, but I guess not after all...?
---
 drivers/gpu/drm/i915/intel_opregion.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index e27c170..0f2db16 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;
 
-- 
1.7.9.5