From: Jerome Glisse jglisse@redhat.com
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@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Alex Deucher alexander.deucher@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; } }