diff options
| author | Harold Sun <[email protected]> | 2025-06-19 18:52:54 +0000 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2025-06-30 15:59:00 +0000 |
| commit | fe7645d22bc0f7c1558296538ec49987bf268ef6 (patch) | |
| tree | 9889d25a623f5ea6008c710959acea95b210be62 /drivers/gpu/drm/amd/display/modules/freesync/freesync.c | |
| parent | drm/amd/display: Separate set_gsl from set_gsl_source_select (diff) | |
| download | kernel-fe7645d22bc0f7c1558296538ec49987bf268ef6.tar.gz kernel-fe7645d22bc0f7c1558296538ec49987bf268ef6.zip | |
drm/amd/display: Added case for when RR equals panel's max RR using freesync
[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 <[email protected]>
Signed-off-by: Harold Sun <[email protected]>
Signed-off-by: Ray Wu <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/display/modules/freesync/freesync.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c index 6a939f2f2fb9..71efd2770c99 100644 --- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c +++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c @@ -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)), |