diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_crt.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_crt.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c index d5c130202396..22ff38455731 100644 --- a/drivers/gpu/drm/i915/intel_crt.c +++ b/drivers/gpu/drm/i915/intel_crt.c @@ -217,7 +217,8 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector) { struct drm_device *dev = connector->dev; struct drm_i915_private *dev_priv = dev->dev_private; - u32 hotplug_en; + u32 hotplug_en, orig, stat; + bool ret = false; int i, tries = 0; if (HAS_PCH_SPLIT(dev)) @@ -232,8 +233,8 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector) tries = 2; else tries = 1; - hotplug_en = I915_READ(PORT_HOTPLUG_EN); - hotplug_en &= CRT_FORCE_HOTPLUG_MASK; + hotplug_en = orig = I915_READ(PORT_HOTPLUG_EN); + hotplug_en &= CRT_HOTPLUG_MASK; hotplug_en |= CRT_HOTPLUG_FORCE_DETECT; if (IS_G4X(dev)) @@ -255,11 +256,17 @@ static bool intel_crt_detect_hotplug(struct drm_connector *connector) } while (time_after(timeout, jiffies)); } - if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) != - CRT_HOTPLUG_MONITOR_NONE) - return true; + stat = I915_READ(PORT_HOTPLUG_STAT); + if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE) + ret = true; + + /* clear the interrupt we just generated, if any */ + I915_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS); - return false; + /* and put the bits back */ + I915_WRITE(PORT_HOTPLUG_EN, orig); + + return ret; } static bool intel_crt_detect_ddc(struct drm_encoder *encoder) |