From: Yuanhan Liu <yuanhan.liu@intel.com>
Date: Fri, 8 Oct 2010 09:18:01 +0000 (+0100)
Subject: drm/i915/crt: Make sure the hotplug interrupt is enabled
X-Git-Tag: firefly_0821_release~9833^2~79^2^2~204
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1e35b166fcd025cd9284f48f16395e6241555b0c;p=firefly-linux-kernel-4.4.55.git

drm/i915/crt: Make sure the hotplug interrupt is enabled

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@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 197d4f32585a..0f950e74db3c 100644
--- 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_hotplug(struct drm_connector *connector)
 		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);
 	}