diff options
| author | Fudongwang <Fudong.Wang@amd.com> | 2024-09-14 17:57:06 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2024-10-07 14:11:28 -0400 |
| commit | 915e2ad6dc9ab8c7d3fa997ff349aa027a212b8d (patch) | |
| tree | be7028b3ff7e5668ec7ec5739014eb6d478953e8 | |
| parent | 0e93b76cf92f229409e8da85c2a143868835fec3 (diff) | |
drm/amd/display: force TBT4 dock dsc on
[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>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/link_detection.c | 12 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c | 7 |
3 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h index 41bd95e9177a..50fa8547d718 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -1166,6 +1166,7 @@ struct dpcd_caps { int8_t branch_dev_name[6]; int8_t branch_hw_revision; int8_t branch_fw_revision[2]; + int8_t branch_vendor_specific_data[4]; bool allow_invalid_MSA_timing_param; bool panel_mode_edp; @@ -1358,6 +1359,9 @@ struct dp_trace { #ifndef DP_TUNNELING_IRQ #define DP_TUNNELING_IRQ (1 << 5) #endif +#ifndef DP_BRANCH_VENDOR_SPECIFIC_START +#define DP_BRANCH_VENDOR_SPECIFIC_START 0x50C +#endif /** USB4 DPCD BW Allocation Registers Chapter 10.7 **/ #ifndef DP_TUNNELING_CAPABILITIES #define DP_TUNNELING_CAPABILITIES 0xE000D /* 1.4a */ diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c index d21ee9d12d26..e026c728042a 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c @@ -48,6 +48,9 @@ #include "dm_helpers.h" #include "clk_mgr.h" + // Offset DPCD 050Eh == 0x5A +#define MST_HUB_ID_0x5A 0x5A + #define DC_LOGGER \ link->ctx->logger #define DC_LOGGER_INIT(logger) @@ -692,6 +695,15 @@ static void apply_dpia_mst_dsc_always_on_wa(struct dc_link *link) link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) link->wa_flags.dpia_mst_dsc_always_on = true; + + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && + link->type == dc_connection_mst_branch && + link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 && + link->dpcd_caps.branch_vendor_specific_data[2] == MST_HUB_ID_0x5A && + link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT && + !link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around) { + link->wa_flags.dpia_mst_dsc_always_on = true; + } } static void revert_dpia_mst_dsc_always_on_wa(struct dc_link *link) diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index fe4aa2c158ea..286841456157 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -1207,6 +1207,13 @@ static void get_active_converter_info( dp_hw_fw_revision.ieee_fw_rev, sizeof(dp_hw_fw_revision.ieee_fw_rev)); } + + core_link_read_dpcd( + link, + DP_BRANCH_VENDOR_SPECIFIC_START, + (uint8_t *)link->dpcd_caps.branch_vendor_specific_data, + sizeof(link->dpcd_caps.branch_vendor_specific_data)); + if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14 && link->dpcd_caps.dongle_type != DISPLAY_DONGLE_NONE) { union dp_dfp_cap_ext dfp_cap_ext; |