diff options
| author | Victor Lu <victorchengchi.lu@amd.com> | 2021-07-08 14:50:48 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-07-27 12:04:19 -0400 |
| commit | 9857bb9457fe57248719750cf0f432dce155711f (patch) | |
| tree | 5463c101e8c628aef500c3d5e03db5d9e9f391dc /drivers/gpu/drm/amd/display/dc/dml | |
| parent | 91b03fc6b50c7233da3b22f8be6e143f89b2d839 (diff) | |
| download | linux-9857bb9457fe57248719750cf0f432dce155711f.tar.bz2 | |
drm/amd/display: Guard DST_Y_PREFETCH register overflow in DCN21
[why]
DST_Y_PREFETCH can overflow when DestinationLinesForPrefetch values are
too large due to the former being limited to 8 bits.
[how]
Set the maximum value of DestinationLinesForPrefetch to be 255 * refclk
period.
Reviewed-by: Laktyushkin Dmytro <dmytro.laktyushkin@amd.com>
Acked-by: Solomon Chiu <solomon.chiu@amd.com>
Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dml')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dml/dcn21/display_mode_vba_21.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_mode_vba_21.c b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_mode_vba_21.c index 506797c721ed..4136eb8256cb 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_mode_vba_21.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_mode_vba_21.c @@ -841,6 +841,9 @@ static bool CalculatePrefetchSchedule( else *DestinationLinesForPrefetch = dst_y_prefetch_equ; + // Limit to prevent overflow in DST_Y_PREFETCH register + *DestinationLinesForPrefetch = dml_min(*DestinationLinesForPrefetch, 63.75); + dml_print("DML: VStartup: %d\n", VStartup); dml_print("DML: TCalc: %f\n", TCalc); dml_print("DML: TWait: %f\n", TWait); |