mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

drm/amd/display: fix FCLK pstate change underflow 

[ Upstream commit 972243f973 ]

[Why]
Currently we set FCLK p-state change
watermark calculated based on dummy
p-state latency when UCLK p-state is
not supported

[How]
Calculate FCLK p-state change watermark
based on on FCLK pstate change latency
in case UCLK p-state is not supported

Reviewed-by: Nevenko Stupar <Nevenko.Stupar@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Vladimir Stempen <vladimir.stempen@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:
Vladimir Stempen 2023-01-17 14:14:42 -05:00 committed by Greg Kroah-Hartman
parent 1ec5ede1ae
commit 6853d56dba
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
View File

@ -2038,6 +2038,10 @@ void dcn32_calculate_wm_and_dlg_fpu(struct dc *dc, struct dc_state *context,
*/
context->bw_ctx.bw.dcn.watermarks.a = context->bw_ctx.bw.dcn.watermarks.c;
context->bw_ctx.bw.dcn.watermarks.a.cstate_pstate.pstate_change_ns = 0;
/* Calculate FCLK p-state change watermark based on FCLK pstate change latency in case
* UCLK p-state is not supported, to avoid underflow in case FCLK pstate is supported
*/
context->bw_ctx.bw.dcn.watermarks.a.cstate_pstate.fclk_pstate_change_ns = get_fclk_watermark(&context->bw_ctx.dml, pipes, pipe_cnt) * 1000;
} else {
/* Set A:
* All clocks min.