linux-kernel - [23/26] drm/radeon/kms: dont enable connectors that are off in the

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Date:	Mon, 15 Aug 2011 19:43:06 -0700
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,
	Alex Deucher <alexander.deucher@....com>,
	Dave Airlie <airlied@...hat.com>
Subject: [23/26] drm/radeon/kms: dont enable connectors that are off in the

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

------------------
 hotplug handler

From: Alex Deucher <alexander.deucher@....com>

commit 73104b5cfe3067d68f2c2de3f3d4d4964c55873e upstream.

If we get a hotplug event on an connector that is off, don't
attempt to turn it on or off, it should already be off.

Fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=728228

Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/radeon_connectors.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -60,6 +60,10 @@ void radeon_connector_hotplug(struct drm
 
 	radeon_hpd_set_polarity(rdev, radeon_connector->hpd.hpd);
 
+	/* if the connector is already off, don't turn it back on */
+	if (connector->dpms != DRM_MODE_DPMS_ON)
+		return;
+
 	/* powering up/down the eDP panel generates hpd events which
 	 * can interfere with modesetting.
 	 */


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