linux-kernel - [patch 056/164] drm/radeon/kms: reset ddc

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Message-Id: <20100701173431.545487365@clark.site>
Date:	Thu, 01 Jul 2010 10:34:02 -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: [patch 056/164] drm/radeon/kms: reset ddc_bus in object header parsing

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

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

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

commit 2bfcc0fc698d550689ef020c73b2d977b73e728c upstream.

Some LVDS connectors don't have a ddc bus, so reset the
ddc bus to invalid before parsing the next connector
to avoid using stale ddc bus data.  Should fix
fdo bug 28164.

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_atombios.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -514,6 +514,8 @@ bool radeon_get_atom_connector_info_from
 			}
 
 			/* look up gpio for ddc, hpd */
+			ddc_bus.valid = false;
+			hpd.hpd = RADEON_HPD_NONE;
 			if ((le16_to_cpu(path->usDeviceTag) &
 			     (ATOM_DEVICE_TV_SUPPORT | ATOM_DEVICE_CV_SUPPORT)) == 0) {
 				for (j = 0; j < con_obj->ucNumberOfObjects; j++) {
@@ -569,9 +571,6 @@ bool radeon_get_atom_connector_info_from
 						break;
 					}
 				}
-			} else {
-				hpd.hpd = RADEON_HPD_NONE;
-				ddc_bus.valid = false;
 			}
 
 			conn_id = le16_to_cpu(path->usConnObjectId);


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