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| author | Jimmy Kizito <Jimmy.Kizito@amd.com> | 2021-04-07 18:56:19 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-05-10 18:10:00 -0400 |
| commit | 8225367130666bf2961399a85913af1b4497d9b4 (patch) | |
| tree | 0bdb1edf89c3505eb7230e26eeed3d6eecdd1317 /drivers/gpu/drm/amd/display/include | |
| parent | ede4f6dac99e4b59a7319b9617eff10705045aa2 (diff) | |
| download | linux-8225367130666bf2961399a85913af1b4497d9b4.tar.gz linux-8225367130666bf2961399a85913af1b4497d9b4.tar.bz2 linux-8225367130666bf2961399a85913af1b4497d9b4.zip | |
drm/amd/display: Add fallback and abort paths for DP link training.
[Why]
When enabling a DisplayPort stream:
- Optionally reducing link bandwidth between failed link training
attempts should progressively relax training requirements.
- Abandoning link training altogether if a sink is unplugged should
avoid unnecessary training attempts.
[How]
- Add fallback parameter to DP link training function and reduce link
bandwidth between failed training attempts as long as stream bandwidth
requirements are met.
- Add training status for sink unplug and abort training when this
status is reported.
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Stylon Wang <stylon.wang@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/include')
| -rw-r--r-- | drivers/gpu/drm/amd/display/include/link_service_types.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/include/link_service_types.h b/drivers/gpu/drm/amd/display/include/link_service_types.h index 7392a89e771f..5a250f41004f 100644 --- a/drivers/gpu/drm/amd/display/include/link_service_types.h +++ b/drivers/gpu/drm/amd/display/include/link_service_types.h @@ -68,6 +68,8 @@ enum link_training_result { LINK_TRAINING_LQA_FAIL, /* one of the CR,EQ or symbol lock is dropped */ LINK_TRAINING_LINK_LOSS, + /* Abort link training (because sink unplugged) */ + LINK_TRAINING_ABORT, }; struct link_training_settings { |