Commit 9a714dcf authored by Jimmy Kizito's avatar Jimmy Kizito Committed by Alex Deucher
Browse files

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



[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: default avatarMeenakshikumar Somasundaram <Meenakshikumar.Somasundaram@amd.com>
Acked-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: default avatarJimmy Kizito <Jimmy.Kizito@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent e9a7d236

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

+1 −1
Original line number Diff line number Diff line
@@ -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 &&

drivers/gpu/drm/amd/display/dc/dc.h

+1 −1
Original line number Diff line number Diff line
@@ -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;