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drm/amd/display: Add workaround flag for EDID read on certain docks

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[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>
This commit is contained in:
Jimmy Kizito
2021-09-14 11:37:04 -04:00
committed by Alex Deucher
parent 3137f792c5
commit 4b169ca367
2 changed files with 4 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View File

@@ -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:

1
drivers/gpu/drm/amd/display/dc/dc_link.h
View File

@@ -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;