From: Jerome Glisse <[email protected]>
To have DP behave like VGA/DVI we need to retrain the link
on hotplug. For this to happen we need to force link
training to happen by setting connector dpms to off
before asking it turning it on again.
v2: agd5f
- drop the dp_get_link_status() change in atombios_dp.c
for now. We still need the dpms OFF change.
Signed-off-by: Jerome Glisse <jglisse at redhat.com>
Cc: stable at vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
drivers/gpu/drm/radeon/radeon_connectors.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c
b/drivers/gpu/drm/radeon/radeon_connectors.c
index 3524f17..895e628 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -79,10 +79,16 @@ void radeon_connector_hotplug(struct drm_connector
*connector)
if (dig_connector->dp_sink_type ==
CONNECTOR_OBJECT_ID_DISPLAYPORT) {
int saved_dpms = connector->dpms;
/* Only turn off the display if it's physically
disconnected */
- if (!radeon_hpd_sense(rdev, radeon_connector->hpd.hpd))
+ if (!radeon_hpd_sense(rdev, radeon_connector->hpd.hpd))
{
drm_helper_connector_dpms(connector,
DRM_MODE_DPMS_OFF);
- else if (radeon_dp_needs_link_train(radeon_connector))
+ } else if
(radeon_dp_needs_link_train(radeon_connector)) {
+ /* set it to OFF so that
drm_helper_connector_dpms()
+ * won't return immediately since the current
state
+ * is ON at this point.
+ */
+ connector->dpms = DRM_MODE_DPMS_OFF;
drm_helper_connector_dpms(connector,
DRM_MODE_DPMS_ON);
+ }
connector->dpms = saved_dpms;
}
}
--
1.7.7.5
