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drm/bridge: tc358767: reset voltage-swing & pre-emphasis 

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@ti.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528082747.3631-3-tomi.valkeinen@ti.com
This commit is contained in:
Tomi Valkeinen 2019-05-28 11:27:25 +03:00 committed by Andrzej Hajda
parent bfb6e014c4
commit c28d14849d
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/bridge/tc358767.c
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@ -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;