drm/i915: Remove DAC disable in CRT force detect on IGDNG
This is not required on newer stepping hardware to get
reliable force detect status. Removing this fixes screen
blank flicker in CRT detect on IGDNG.
Cc: Stable Team <stable@kernel.org>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 88814fa..212e227 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -179,13 +179,10 @@
{
struct drm_device *dev = connector->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
- u32 adpa, temp;
+ u32 adpa;
bool ret;
- temp = adpa = I915_READ(PCH_ADPA);
-
- adpa &= ~ADPA_DAC_ENABLE;
- I915_WRITE(PCH_ADPA, adpa);
+ adpa = I915_READ(PCH_ADPA);
adpa &= ~ADPA_CRT_HOTPLUG_MASK;
@@ -212,8 +209,6 @@
else
ret = false;
- /* restore origin register */
- I915_WRITE(PCH_ADPA, temp);
return ret;
}