linux-kernel - [77/90] drm/i915: Fix CRT hotplug detect by checking really no channels attached

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Date:	Wed, 16 Dec 2009 17:15:28 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Zhenyu Wang <zhenyuw@...ux.intel.com>,
	Eric Anholt <eric@...olt.net>
Subject: [77/90] drm/i915: Fix CRT hotplug detect by checking really no channels attached

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

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

From: Zhenyu Wang <zhenyuw@...ux.intel.com>

commit 8e9e0eea9955bffbe5e5cd6355157cabddc31f17 upstream.

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@...ux.intel.com>
Signed-off-by: Eric Anholt <eric@...olt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/intel_crt.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -234,8 +234,8 @@ static bool intel_crt_detect_hotplug(str
 		} 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;


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