We need to reset DPCD voltage-swing & pre-emphasis before starting the link training, as otherwise tc358767 will use the previous values as minimums. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx> Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> --- drivers/gpu/drm/bridge/tc358767.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index b6c4d1063ccb..c8b04f711db3 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -956,6 +956,13 @@ static int tc_main_link_setup(struct tc_data *tc) if (ret < 0) goto err_dpcd_write; + /* Reset voltage-swing & pre-emphasis */ + tmp[0] = tmp[1] = DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | + DP_TRAIN_PRE_EMPH_LEVEL_0; + ret = drm_dp_dpcd_write(aux, DP_TRAINING_LANE0_SET, tmp, 2); + if (ret < 0) + goto err_dpcd_write; + ret = tc_link_training(tc, DP_TRAINING_PATTERN_1); if (ret) goto err; -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
