Gh0st
/
linux
mirror of https://github.com/torvalds/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

drm/amd/display: Add DPIA debug option for zero allocation patch 

[WHY & HOW]
The BW zero allocation patch is no longer required.
Add a debug option to enable it in case we encounter an issue.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Cruise Hung <Cruise.Hung@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Cruise Hung 2025-05-26 15:07:59 +08:00 committed by Alex Deucher
parent 29e178d139
commit 8d0d293c91
2 changed files with 12 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -824,7 +824,8 @@ union dpia_debug_options {
uint32_t disable_mst_dsc_work_around:1; /* bit 3 */
uint32_t enable_force_tbt3_work_around:1; /* bit 4 */
uint32_t disable_usb4_pm_support:1; /* bit 5 */
uint32_t reserved:26;
uint32_t enable_usb4_bw_zero_alloc_patch:1; /* bit 6 */
uint32_t reserved:25;
} bits;
uint32_t raw;
};

18
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
View File

@ -304,14 +304,16 @@ bool link_dpia_enable_usb4_dp_bw_alloc_mode(struct dc_link *link)
link->dpia_bw_alloc_config.bw_alloc_enabled = true;
ret = true;
/*
* During DP tunnel creation, CM preallocates BW and reduces estimated BW of other
* DPIA. CM release preallocation only when allocation is complete. Do zero alloc
* to make the CM to release preallocation and update estimated BW correctly for
* all DPIAs per host router
*/
// TODO: Zero allocation can be removed once the MSFT CM fix has been released
link_dp_dpia_allocate_usb4_bandwidth_for_stream(link, 0);
if (link->dc->debug.dpia_debug.bits.enable_usb4_bw_zero_alloc_patch) {
/*
* During DP tunnel creation, the CM preallocates BW
* and reduces the estimated BW of other DPIAs.
* The CM releases the preallocation only when the allocation is complete.
* Perform a zero allocation to make the CM release the preallocation
* and correctly update the estimated BW for all DPIAs per host router.
*/
link_dp_dpia_allocate_usb4_bandwidth_for_stream(link, 0);
}
} else
DC_LOG_DEBUG("%s: link[%d] failed to enable DPTX BW allocation mode", __func__, link->link_index);
}