Commit 9410a377 authored by Anthony Koo's avatar Anthony Koo Committed by Alex Deucher
Browse files

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



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: default avatarAnthony Koo <Anthony.Koo@amd.com>
Reviewed-by: default avatarAric Cyr <Aric.Cyr@amd.com>
Acked-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent be922ff7

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

+0 −6
Original line number Diff line number Diff line
@@ -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;

	}

}