drm/amd/display: force TBT4 dock dsc on

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

[why]
TBT4 dock have bandwidth limitation, need dsc always on to support all
modes.

[how]
force dsc always on when detect TBT4 dock.

Reviewed-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Fudongwang <Fudong.Wang@amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

authored by

Fudongwang and committed by

Alex Deucher 2 years ago 915e2ad6 0e93b76c

+23

3 changed files

expand all

drivers

gpu

drm

amd

display

dc_dp_types.h

link

link_detection.c

protocols

link_dp_capability.c

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

··· 1166 1166 int8_t branch_dev_name[6]; 1167 1167 int8_t branch_hw_revision; 1168 1168 int8_t branch_fw_revision[2]; 1169 + int8_t branch_vendor_specific_data[4]; 1169 1170 1170 1171 bool allow_invalid_MSA_timing_param; 1171 1172 bool panel_mode_edp; ··· 1358 1357 #endif 1359 1358 #ifndef DP_TUNNELING_IRQ 1360 1359 #define DP_TUNNELING_IRQ (1 << 5) 1360 + #endif 1361 + #ifndef DP_BRANCH_VENDOR_SPECIFIC_START 1362 + #define DP_BRANCH_VENDOR_SPECIFIC_START 0x50C 1361 1363 #endif 1362 1364 /** USB4 DPCD BW Allocation Registers Chapter 10.7 **/ 1363 1365 #ifndef DP_TUNNELING_CAPABILITIES

+12

drivers/gpu/drm/amd/display/dc/link/link_detection.c

··· 48 48 #include "dm_helpers.h" 49 49 #include "clk_mgr.h" 50 50 51 + // Offset DPCD 050Eh == 0x5A 52 + #define MST_HUB_ID_0x5A 0x5A 53 + 51 54 #define DC_LOGGER \ 52 55 link->ctx->logger 53 56 #define DC_LOGGER_INIT(logger) ··· 695 692 link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && 696 693 !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) 697 694 link->wa_flags.dpia_mst_dsc_always_on = true; 695 + 696 + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && 697 + link->type == dc_connection_mst_branch && 698 + link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 && 699 + link->dpcd_caps.branch_vendor_specific_data[2] == MST_HUB_ID_0x5A && 700 + link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && 701 + !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) { 702 + link->wa_flags.dpia_mst_dsc_always_on = true; 703 + } 698 704 } 699 705 700 706 static void revert_dpia_mst_dsc_always_on_wa(struct dc_link *link)

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c

··· 1207 1207 dp_hw_fw_revision.ieee_fw_rev, 1208 1208 sizeof(dp_hw_fw_revision.ieee_fw_rev)); 1209 1209 } 1210 + 1211 + core_link_read_dpcd( 1212 + link, 1213 + DP_BRANCH_VENDOR_SPECIFIC_START, 1214 + (uint8_t *)link->dpcd_caps.branch_vendor_specific_data, 1215 + sizeof(link->dpcd_caps.branch_vendor_specific_data)); 1216 + 1210 1217 if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14 && 1211 1218 link->dpcd_caps.dongle_type != DISPLAY_DONGLE_NONE) { 1212 1219 union dp_dfp_cap_ext dfp_cap_ext;