From: Dave Airlie <[email protected]> Like on Sandybridge, disabling the DAC here when doing CRT load detect avoids forever hangs waiting on the hardware.
test procedure on HP 2740p: boot with no VGA plugged in, start X, plug in VGA monitor (1280x1024) chvt 3 machine hangs waiting forever. Signed-off-by: Dave Airlie <[email protected]> --- drivers/gpu/drm/i915/intel_crt.c | 23 ++++++++++++----------- 1 files changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index ee0732b..2a3b59b 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -160,19 +160,20 @@ static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector) struct drm_i915_private *dev_priv = dev->dev_private; u32 adpa, temp; bool ret; + bool turn_off_dac = false; temp = adpa = I915_READ(PCH_ADPA); - if (HAS_PCH_CPT(dev)) { - /* Disable DAC before force detect */ - I915_WRITE(PCH_ADPA, adpa & ~ADPA_DAC_ENABLE); - (void)I915_READ(PCH_ADPA); - } else { - adpa &= ~ADPA_CRT_HOTPLUG_MASK; - /* disable HPD first */ - I915_WRITE(PCH_ADPA, adpa); - (void)I915_READ(PCH_ADPA); - } + if (HAS_PCH_SPLIT(dev)) + turn_off_dac = true; + + adpa &= ~ADPA_CRT_HOTPLUG_MASK; + if (turn_off_dac) + adpa &= ~ADPA_DAC_ENABLE; + + /* disable HPD first */ + I915_WRITE(PCH_ADPA, adpa); + (void)I915_READ(PCH_ADPA); adpa |= (ADPA_CRT_HOTPLUG_PERIOD_128 | ADPA_CRT_HOTPLUG_WARMUP_10MS | @@ -188,7 +189,7 @@ static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector) while ((I915_READ(PCH_ADPA) & ADPA_CRT_HOTPLUG_FORCE_TRIGGER) != 0) ; - if (HAS_PCH_CPT(dev)) { + if (turn_off_dac) { I915_WRITE(PCH_ADPA, temp); (void)I915_READ(PCH_ADPA); } -- 1.7.1 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
