drm/i915: Fix CRT hotplug detect by checking really no channels attached

For CRT hotplug detect status, we have four test results as blue
channel only, green channel only, both blue and green channel, and
no channel attached. Origin code only marks both blue and green channel
case as connected, but ignore other possible connected states. This one
trys to detect CRT by checking no channel attached case instead.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 212e22740fc123e4a569a1e84e7445ae8a9de135..e5051446c48e12ff14f5d504fbc3bdef72c8b2b8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -262,8 +262,8 @@ 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_COLOR)
+       if ((I915_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
+           CRT_HOTPLUG_MONITOR_NONE)
                return true;
 
        return false;