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authorZhenyu Wang <zhenyuw@linux.intel.com>2010-01-25 10:35:16 +0800
committerEric Anholt <eric@anholt.net>2010-01-25 08:52:54 -0800
commiteceb784cec4dc0fcc2993d9ee4a7c0d111ada80a (patch)
treebdb478e5d60004304b1106967473557edcb883b9 /drivers/gpu/drm
parent92dcffb916d309aa01778bf8963a6932e4014d07 (diff)
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')
-rw-r--r--drivers/gpu/drm/i915/intel_crt.c3
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 ddefc871edf..79dd4026586 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 |