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: 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>

1 files changed, 0 insertions, 6 deletions

diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index abd5c9374eb3..daad60ec1ce3 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -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;
         }
 }