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| author | Peichen Huang <PeiChen.Huang@amd.com> | 2024-12-25 15:51:34 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2025-01-10 12:12:29 -0500 |
| commit | 230dced3e2b712017c03ce0afb3f8c48d8af20ee (patch) | |
| tree | 9a302cbd7dd3cde788e742d2ce0ddecaa9d156bb /drivers/gpu/drm/amd/display/dc/dio | |
| parent | ec6d8d49f44b4d0cbf8674f81374ea4df04228da (diff) | |
| download | linux-next-230dced3e2b712017c03ce0afb3f8c48d8af20ee.tar.gz linux-next-230dced3e2b712017c03ce0afb3f8c48d8af20ee.zip | |
drm/amd/display: improve dpia pre-train
[WHY]
We see unstable DP LL 4.2.1.3 test result with dpia pre-train. It is
because the outbox interrupt mechanism can not handle HPD
immediately and require some improvement.
[HOW]
1. not enable link if hpd_pending is true.
2. abort pre-train if training failed and hpd_pending is true.
3. check if 2 lane supported when it is alt mode
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Peichen Huang <PeiChen.Huang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dio')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dio/dcn31/dcn31_dio_link_encoder.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dio/dcn31/dcn31_dio_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dio/dcn31/dcn31_dio_link_encoder.c index b2cea59ba5d4..9a92f73d5b7f 100644 --- a/drivers/gpu/drm/amd/display/dc/dio/dcn31/dcn31_dio_link_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/dio/dcn31/dcn31_dio_link_encoder.c @@ -653,8 +653,9 @@ void dcn31_link_encoder_get_max_link_cap(struct link_encoder *enc, struct dc_lin if (!query_dp_alt_from_dmub(enc, &cmd)) return; - if (cmd.query_dp_alt.data.is_usb && - cmd.query_dp_alt.data.is_dp4 == 0) + if (cmd.query_dp_alt.data.is_dp_alt_disable == 0 && + cmd.query_dp_alt.data.is_usb && + cmd.query_dp_alt.data.is_dp4 == 0) link_settings->lane_count = MIN(LANE_COUNT_TWO, link_settings->lane_count); return; |