linux-kernel - [055/140] drm/radeon/kms: fix shared ddc handling

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Message-Id: <20100730173107.679124964@clark.site>
Date:	Fri, 30 Jul 2010 10:30:20 -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 <alexdeucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [055/140] drm/radeon/kms: fix shared ddc handling

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

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

From: Alex Deucher <alexdeucher@...il.com>

commit b2ea4aa67bfd084834edd070e0a4a47857d6db59 upstream.

Connectors with a shared ddc line can be connected to different
encoders.

Reported by Pasi Kärkkäinen <pasik@....fi> on dri-devel

Signed-off-by: Alex Deucher <alexdeucher@...il.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, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -793,7 +793,9 @@ static enum drm_connector_status radeon_
 					if (connector == list_connector)
 						continue;
 					list_radeon_connector = to_radeon_connector(list_connector);
-					if (radeon_connector->devices == list_radeon_connector->devices) {
+					if (list_radeon_connector->shared_ddc &&
+					    (list_radeon_connector->ddc_bus->rec.i2c_id ==
+					     radeon_connector->ddc_bus->rec.i2c_id)) {
 						if (drm_detect_hdmi_monitor(radeon_connector->edid)) {
 							if (connector->connector_type == DRM_MODE_CONNECTOR_DVID) {
 								kfree(radeon_connector->edid);


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