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| author | Zhenyu Wang <zhenyuw@linux.intel.com> | 2010-01-25 10:35:16 +0800 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-01-25 08:52:54 -0800 |
| commit | eceb784cec4dc0fcc2993d9ee4a7c0d111ada80a (patch) | |
| tree | bdb478e5d60004304b1106967473557edcb883b9 /drivers/gpu/drm/i915/intel_crt.c | |
| parent | 92dcffb916d309aa01778bf8963a6932e4014d07 (diff) | |
| download | kernel_samsung_smdk4412-eceb784cec4dc0fcc2993d9ee4a7c0d111ada80a.zip kernel_samsung_smdk4412-eceb784cec4dc0fcc2993d9ee4a7c0d111ada80a.tar.gz kernel_samsung_smdk4412-eceb784cec4dc0fcc2993d9ee4a7c0d111ada80a.tar.bz2 | |
drm/i915: disable hotplug detect before Ironlake CRT detect
This tries to fix CRT detect loop hang seen on some Ironlake form
factor, to clear up hotplug detect state before taking CRT detect
to make sure next hotplug detect cycle is consistent.
Cc: Stable Team <stable@kernel.org>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_crt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_crt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index ddefc87..79dd402 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -157,6 +157,9 @@ static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector) adpa = I915_READ(PCH_ADPA); adpa &= ~ADPA_CRT_HOTPLUG_MASK; + /* disable HPD first */ + I915_WRITE(PCH_ADPA, adpa); + (void)I915_READ(PCH_ADPA); adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 | ADPA_CRT_HOTPLUG_WARMUP_10MS | |