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drm/i915: fix VGA detect on IGDNG

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Check FORCE_DETECT bit to be clear for the finish
of hotplug detect process. Also check possible mono
monitor which should also be marked as connected.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Zhenyu Wang 2009-07-24 01:00:33 +08:00 committed by Eric Anholt
parent 32f9d658ae
commit 67941da28d
1 changed files with 8 additions and 4 deletions
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12
drivers/gpu/drm/i915/intel_crt.c
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@ -156,6 +156,9 @@ static bool intel_igdng_crt_detect_hotplug(struct drm_connector *connector)
temp = adpa = I915_READ(PCH_ADPA);
adpa &= ~ADPA_DAC_ENABLE;
I915_WRITE(PCH_ADPA, adpa);
adpa &= ~ADPA_CRT_HOTPLUG_MASK;
adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 |
@ -169,13 +172,14 @@ static bool intel_igdng_crt_detect_hotplug(struct drm_connector *connector)
DRM_DEBUG("pch crt adpa 0x%x", adpa);
I915_WRITE(PCH_ADPA, adpa);
/* This might not be needed as not specified in spec...*/
udelay(1000);
while ((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) != 0)
;
/* Check the status to see if both blue and green are on now */
adpa = I915_READ(PCH_ADPA);
if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) ==
ADPA_CRT_HOTPLUG_MONITOR_COLOR)
adpa &= ADPA_CRT_HOTPLUG_MONITOR_MASK;
if ((adpa == ADPA_CRT_HOTPLUG_MONITOR_COLOR) ||
(adpa == ADPA_CRT_HOTPLUG_MONITOR_MONO))
ret = true;
else
ret = false;