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.valkei...@ti.com>
---
drivers/gpu/drm/bridge/tc358767.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/bridge/tc358767.c
b/drivers/gpu/drm/bridge/tc358767.c
index 7031c4f52c57..11a50f7bb4be 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -956,6 +956,12 @@ 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;
--
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