diff options
| author | Jimmy Kizito <Jimmy.Kizito@amd.com> | 2021-09-14 11:37:04 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-10-28 14:26:17 -0400 |
| commit | 4b169ca3674919756e76616dc65a79114962ea14 (patch) | |
| tree | fb9aa2131c00d5b9cc63eeeed1852d25e70605c1 | |
| parent | 3137f792c5bd68c799a9c3762fd37e428bbcf152 (diff) | |
drm/amd/display: Add workaround flag for EDID read on certain docks
[Why]
Certain docks appear to NAK I2C writes to the segment pointer with the
MOT (middle of transaction) bit clear. This behaviour can cause EDID
reads from higher segments to fail.
[How]
Add workaround flag for links which connect to docks exhibiting this
issue.
Cc: Wayne Lin <wayne.lin@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_link.h | 1 |
2 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index a1fa50ddf43e..27b9ff98a569 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1765,6 +1765,9 @@ static bool dc_link_construct_dpia(struct dc_link *link, link->psr_settings.psr_version = DC_PSR_VERSION_UNSUPPORTED; + /* Some docks seem to NAK I2C writes to segment pointer with mot=0. */ + link->wa_flags.dp_mot_reset_segment = true; + return true; ddc_create_fail: diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index b991ba1d6f9a..180ecd860296 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -190,6 +190,7 @@ struct dc_link { bool dp_keep_receiver_powered; bool dp_skip_DID2; bool dp_skip_reset_segment; + bool dp_mot_reset_segment; } wa_flags; struct link_mst_stream_allocation_table mst_stream_alloc_table; |