diff options
| author | Michael Strauss <michael.strauss@amd.com> | 2023-03-24 17:48:37 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-04-12 01:03:43 +0300 |
| commit | 7727e7b60f82e8265a1061b81379f5a7bce0dba6 (patch) | |
| tree | dd0b9b1a40c55910dc0839c738e525c4c3e7faec /drivers/gpu/drm/amd/display/dc/link/link_dpms.c | |
| parent | 554836cc24411e4d3645db5392655f8d28d1d47a (diff) | |
| download | linux-7727e7b60f82e8265a1061b81379f5a7bce0dba6.tar.xz | |
drm/amd/display: Improve robustness of FIXED_VS link training at DP1 rates
[WHY]
New sequence for transparent mode DP1.x link training was provided by LTTPR
vendor
[HOW]
Implement new FIXED_VS sequence, increase LT retry count to minimize
any potential intermittent lightup failures
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@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/link/link_dpms.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/link_dpms.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c index f6c5ee2d639b..027ad1f0144d 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c @@ -2035,6 +2035,12 @@ static enum dc_status enable_link_dp(struct dc_state *state, uint32_t post_oui_delay = 30; // 30ms /* Reduce link bandwidth between failed link training attempts. */ bool do_fallback = false; + int lt_attempts = LINK_TRAINING_ATTEMPTS; + + // Increase retry count if attempting DP1.x on FIXED_VS link + if ((link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && + link_dp_get_encoding_format(link_settings) == DP_8b_10b_ENCODING) + lt_attempts = 10; // check for seamless boot for (i = 0; i < state->stream_count; i++) { @@ -2099,7 +2105,7 @@ static enum dc_status enable_link_dp(struct dc_state *state, if (perform_link_training_with_retries(link_settings, skip_video_pattern, - LINK_TRAINING_ATTEMPTS, + lt_attempts, pipe_ctx, pipe_ctx->stream->signal, do_fallback)) { |