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drm/i915: Remove DAC disable in CRT force detect on IGDNG

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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>
This commit is contained in:
Zhenyu Wang 2009-09-19 14:54:08 +08:00 committed by Jesse Barnes
parent 339e5a4c78
commit 730915d65f
1 changed files with 2 additions and 7 deletions
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9
drivers/gpu/drm/i915/intel_crt.c
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@ -179,13 +179,10 @@ static bool intel_igdng_crt_detect_hotplug(struct drm_connector *connector)
{
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 @@ static bool intel_igdng_crt_detect_hotplug(struct drm_connector *connector)
else
ret = false;
/* restore origin register */
I915_WRITE(PCH_ADPA, temp);
return ret;
}