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From: Greg KH on 1 Jul 2010 18:20
2.6.33-stable review patch. If anyone has any objections, please let me know.

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

From: Alex Deucher <alexdeucher(a)gmail.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(a)gmail.com>
Signed-off-by: Dave Airlie <airlied(a)redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.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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