[086/289] drm/i915/crt: Make sure the hotplug interrupt is enabled

[Greg KH]

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Yuanhan Liu <yuanhan.liu@xxxxxxxxx>

commit 1510a97182b4ddb5fe3c4e8d05240f7cd6fd13e7 upstream.

After disabling the hotplug interrupts for VGA detection on Ironlake, be
sure to re-enable them again afterwards.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30378
Signed-off-by: Yuanhan Liu <yuanhan.liu@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/gpu/drm/i915/intel_crt.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -191,7 +191,8 @@ static bool intel_ironlake_crt_detect_ho
 		DRM_DEBUG_KMS("timed out waiting for FORCE_TRIGGER");
 
 	if (turn_off_dac) {
-		I915_WRITE(PCH_ADPA, temp);
+		/* Make sure hotplug is enabled */
+		I915_WRITE(PCH_ADPA, temp | ADPA_CRT_HOTPLUG_ENABLE);
 		(void)I915_READ(PCH_ADPA);
 	}
 


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