From ca2ccde5e2f24a792caa4cca919fc5c6f65d1887 Mon Sep 17 00:00:00 2001 From: Jerome Glisse Date: Thu, 19 Jul 2012 17:25:55 -0400 Subject: [PATCH] drm/radeon: on hotplug force link training to happen (v2) 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 Cc: stable@vger.kernel.org Signed-off-by: Alex Deucher Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/radeon_connectors.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c index 3524f17e3f05..895e628b60f8 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; } } -- 2.20.1