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| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2019-05-28 10:27:25 +0200 |
|---|---|---|
| committer | Andrzej Hajda <a.hajda@samsung.com> | 2019-05-31 15:41:16 +0200 |
| commit | c28d14849d374c89ae17134a5bc4a3818fe72467 (patch) | |
| tree | 0417e9133a3aa6f30acebbcb42d7dbd47aed4fa7 /drivers/gpu/drm/bridge/tc358767.c | |
| parent | drm/bridge: tc358767: fix tc_aux_get_status error handling (diff) | |
| download | linux-c28d14849d374c89ae17134a5bc4a3818fe72467.tar.xz linux-c28d14849d374c89ae17134a5bc4a3818fe72467.zip | |
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
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/bridge/tc358767.c | 7 |
1 files changed, 7 insertions, 0 deletions
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; |