From 06b758a32bb5ca164cff60f20173ecd71508c5ae Mon Sep 17 00:00:00 2001 From: Sandor Yu Date: Mon, 9 Dec 2019 17:58:29 +0800 Subject: [PATCH] LF-323-2: drm/bridge/cdns: enhance link training stability Remove drm_dp_link_power_down from bridge_disable function, in case some DP sinks aren't follow DP 1.1 specification and can not exit the power saving state within 1 ms. Add drm_dp_link_power_up to bridge_enable function, make sure DP sinks are power up before link training. Signed-off-by: Sandor Yu Reviewed-by: Robby Cai --- drivers/gpu/drm/bridge/cadence/cdns-dp-core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c +++ b/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c @@ -329,6 +329,8 @@ static void cdn_hdp_bridge_enable(struct struct cdns_mhdp_device *mhdp = bridge->driver_private; int ret; + drm_dp_link_power_up(&mhdp->dp.aux, &mhdp->dp.link); + /* Link trainning */ ret = cdns_mhdp_train_link(mhdp); if (ret) { @@ -348,7 +350,6 @@ static void cdn_hdp_bridge_disable(struc struct cdns_mhdp_device *mhdp = bridge->driver_private; cdns_mhdp_set_video_status(mhdp, CONTROL_VIDEO_IDLE); - drm_dp_link_power_down(&mhdp->dp.aux, &mhdp->dp.link); } static const struct drm_bridge_funcs cdns_dp_bridge_funcs = {