torvalds/linux
3
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-18 12:19:11 +08:00
Code Issues Packages Projects Releases Wiki Activity

drm/amd/display: Added case for when RR equals panel's max RR using freesync

Browse Source 
[WHY]
Rounding error sometimes occurs when the refresh rate is equal to a panel's
max refresh rate, causing HDMI compliance failures.

[HOW]
Added a case so that we round up to avoid v_total_min to be below a panel's
minimum bound.

Reviewed-by: Jun Lei <jun.lei@amd.com>
Signed-off-by: Harold Sun <Harold.Sun@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit fe7645d22b)
This commit is contained in:
Harold Sun
2025-06-19 14:52:54 -04:00
committed by Alex Deucher
parent 34659c1a1f
commit 84f2902bfc
2 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/amd/display/dc/dc_hw_types.h
View File

@@ -974,6 +974,7 @@ struct dc_crtc_timing {
uint32_t pix_clk_100hz;
uint32_t min_refresh_in_uhz;
uint32_t max_refresh_in_uhz;
uint32_t vic;
uint32_t hdmi_vic;

8
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
View File

@@ -155,6 +155,14 @@ unsigned int mod_freesync_calc_v_total_from_refresh(
v_total = div64_u64(div64_u64(((unsigned long long)(
frame_duration_in_ns) * (stream->timing.pix_clk_100hz / 10)),
stream->timing.h_total), 1000000);
} else if (refresh_in_uhz >= stream->timing.max_refresh_in_uhz) {
/* When the target refresh rate is the maximum panel refresh rate
* round up the vtotal value to prevent off-by-one error causing
* v_total_min to be below the panel's lower bound
*/
v_total = div64_u64(div64_u64(((unsigned long long)(
frame_duration_in_ns) * (stream->timing.pix_clk_100hz / 10)),
stream->timing.h_total) + (1000000 - 1), 1000000);
} else {
v_total = div64_u64(div64_u64(((unsigned long long)(
frame_duration_in_ns) * (stream->timing.pix_clk_100hz / 10)),