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path: root/drivers/gpu/drm/i915/intel_crt.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_crt.c')
-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 ddefc871edfe..79dd4026586f 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 |