drm/radeon/kms: reset ddc_bus in object header parsing

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@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 1c24dad..8cb4173 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -530,6 +530,8 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
                        }
 
                        /* 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++) {
@@ -585,9 +587,6 @@ bool radeon_get_atom_connector_info_from_object_table(struct drm_device *dev)
                                                break;
                                        }
                                }
-                       } else {
-                               hpd.hpd = RADEON_HPD_NONE;
-                               ddc_bus.valid = false;
                        }
 
                        /* needed for aux chan transactions */