iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/amd/display: fix LFC tearing at top of screen

Browse Source 
Tearing occurred because new VTOTAL MIN/MAX was being programmed
too early.
The flip can happen within the VUPDATE high region, and the new min/max
would take effect immediately. But this means that frame is not variable
anymore, and tearing would occur when the flip actually happens.

The fixed insert duration should be programmed on the first VUPDATE
interrupt instead.

Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Anthony Koo 2018-04-06 12:12:06 -04:00 committed by Alex Deucher
parent be922ff750
commit 9410a3776b
1 changed files with 0 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
View File

@ -371,12 +371,6 @@ static void apply_below_the_range(struct core_freesync *core_freesync,
inserted_frame_duration_in_us;
in_out_vrr->btr.frames_to_insert = frames_to_insert;
in_out_vrr->btr.frame_counter = frames_to_insert;
in_out_vrr->adjust.v_total_min =
calc_v_total_from_duration(stream, in_out_vrr,
in_out_vrr->btr.inserted_duration_in_us);
in_out_vrr->adjust.v_total_max =
in_out_vrr->adjust.v_total_min;
}
}