diff options
| author | Sean Anderson <sean.anderson@linux.dev> | 2024-04-23 13:18:50 -0400 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2024-04-26 20:09:10 +0300 |
| commit | c032d84694129c290a0958f2aac4df901c45d4a6 (patch) | |
| tree | 459b564d4aff54324771a0a8ddf8051db4d32b6e | |
| parent | 25af9c1ab3327405e94ecbcf4f952c3a2f145708 (diff) | |
drm: zynqmp_dp: Adjust training values per-lane
The feedback we get from the DPRX is per-lane. Make changes using this
information, instead of picking the maximum values from all lanes. This
results in more-consistent training on marginal links.
Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240423171859.3953024-5-sean.anderson@linux.dev
| -rw-r--r-- | drivers/gpu/drm/xlnx/zynqmp_dp.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c index 43f47c8a51a0..9df068a413f3 100644 --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -606,28 +606,21 @@ static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp, u8 link_status[DP_LINK_STATUS_SIZE]) { u8 *train_set = dp->train_set; - u8 voltage = 0, preemphasis = 0; u8 i; for (i = 0; i < dp->mode.lane_cnt; i++) { - u8 v = drm_dp_get_adjust_request_voltage(link_status, i); - u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i); + u8 voltage = drm_dp_get_adjust_request_voltage(link_status, i); + u8 preemphasis = + drm_dp_get_adjust_request_pre_emphasis(link_status, i); - if (v > voltage) - voltage = v; + if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3) + voltage |= DP_TRAIN_MAX_SWING_REACHED; - if (p > preemphasis) - preemphasis = p; - } - - if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3) - voltage |= DP_TRAIN_MAX_SWING_REACHED; + if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2) + preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; - if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2) - preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; - - for (i = 0; i < dp->mode.lane_cnt; i++) train_set[i] = voltage | preemphasis; + } } /** |