diff options
| author | Sung Joon Kim <sungkim@amd.com> | 2022-01-23 13:20:11 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-01-25 18:00:35 -0500 |
| commit | 72b90723b3760c69721b04f59436f38cd215e2df (patch) | |
| tree | 1f2277dd5f1423932df5930fe790f0a072c0adc8 | |
| parent | 5f2c1192eba42f6926253a1f2c9b18da05b3c31f (diff) | |
| download | lwn-72b90723b3760c69721b04f59436f38cd215e2df.tar.gz lwn-72b90723b3760c69721b04f59436f38cd215e2df.zip | |
drm/amd/display: remove PHY repeater count check for LTTPR mode
[why]
Due to bad hardware, the PHY repeater count in LTTPR cap is read as 0xFF
in some monitors while the LTTPR is actually present.
[how]
Remove PHY repeater counter check when configuring LTTPR mode.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Sung Joon Kim <sungkim@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 062bdbadc781..538ace042961 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -5069,9 +5069,8 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link) DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV]; /* Attempt to train in LTTPR transparent mode if repeater count exceeds 8. */ - is_lttpr_present = (dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) != 0 && + is_lttpr_present = (link->dpcd_caps.lttpr_caps.max_lane_count > 0 && link->dpcd_caps.lttpr_caps.phy_repeater_cnt < 0xff && - link->dpcd_caps.lttpr_caps.max_lane_count > 0 && link->dpcd_caps.lttpr_caps.max_lane_count <= 4 && link->dpcd_caps.lttpr_caps.revision.raw >= 0x14); if (is_lttpr_present) { |