mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-16 07:35:14 +00:00
Code Issues Releases Wiki Activity

drm/amd/display: Allocate zero bw after bw alloc enable

Browse source 
[ Upstream commit 46fe9cb1a9 ]

[Why]
During DP tunnel creation, CM preallocates BW and reduces
estimated BW of other DPIA. CM release preallocation only
when allocation is complete. Display mode validation logic
validates timings based on bw available per host router.
In multi display setup, this causes bw allocation failure
when allocation greater than estimated bw.

[How]
Do zero alloc to make the CM to release preallocation and
update estimated BW correctly for all DPIAs per host router.

Reviewed-by: PeiChen Huang <peichen.huang@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Meenakshikumar Somasundaram 2024-04-10 10:46:35 -04:00 committed by Greg Kroah-Hartman
parent e0760e3847
commit 53a7d15331
1 changed files with 9 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c
View file

@ -270,7 +270,7 @@ static void set_usb4_req_bw_req(struct dc_link *link, int req_bw)
/* Error check whether requested and allocated are equal */
req_bw = requested_bw * (Kbps_TO_Gbps / link->dpia_bw_alloc_config.bw_granularity);
if (req_bw == link->dpia_bw_alloc_config.allocated_bw) {
if (req_bw && (req_bw == link->dpia_bw_alloc_config.allocated_bw)) {
DC_LOG_ERROR("%s: Request bw equals to allocated bw for link(%d)\n",
__func__, link->link_index);
}
@ -341,6 +341,14 @@ bool link_dp_dpia_set_dptx_usb4_bw_alloc_support(struct dc_link *link)
ret = true;
init_usb4_bw_struct(link);
link->dpia_bw_alloc_config.bw_alloc_enabled = 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
*/
link_dp_dpia_allocate_usb4_bandwidth_for_stream(link, 0);
}
}