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drm/amd/display: Disable TBT3 DSC work around by default.

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[Why]
Some TBT3 docks have DPOAs which report USB4 capability and are expected
to support USB4 DPOA features such as FEC/DSC.

[How]
By default, do not override FEC/DSC capabilities reported by TBT3 docks.

Reviewed-by: Meenakshikumar Somasundaram <Meenakshikumar.Somasundaram@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jimmy Kizito 2022-06-13 10:19:18 -04:00 committed by Alex Deucher
parent e9a7d236ea
commit 9a714dcf10
2 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
View File

@ -5553,7 +5553,7 @@ static bool retrieve_link_cap(struct dc_link *link)
* only if required.
*/
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
!link->dc->debug.dpia_debug.bits.disable_force_tbt3_work_around &&
link->dc->debug.dpia_debug.bits.enable_force_tbt3_work_around &&
link->dpcd_caps.is_branch_dev &&
link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
link->dpcd_caps.branch_hw_revision == DP_BRANCH_HW_REV_10 &&

2
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -542,7 +542,7 @@ union dpia_debug_options {
uint32_t force_non_lttpr:1; /* bit 1 */
uint32_t extend_aux_rd_interval:1; /* bit 2 */
uint32_t disable_mst_dsc_work_around:1; /* bit 3 */
uint32_t disable_force_tbt3_work_around:1; /* bit 4 */
uint32_t enable_force_tbt3_work_around:1; /* bit 4 */
uint32_t reserved:27;
} bits;
uint32_t raw;