[PATCH 12/18] drm/amd/display: FreeSync not active near lower bound of non-LFC monitor range

[Eryk Brol]

From: Aric Cyr <aric....@amd.com>

[Why]
On narrow range monitors without LFC, a margin prevents good utilization
of the available range.

[How]
Decrease the margin for exiting fixed mode and fix the frame counter to
reset if a non-consecutive render is found.

Signed-off-by: Aric Cyr <aric....@amd.com>
Reviewed-by: Anthony Koo <anthony....@amd.com>
Acked-by: Eryk Brol <eryk.b...@amd.com>
---
 .../gpu/drm/amd/display/modules/freesync/freesync.c    | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c 
b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index f76d31451dcb..52c3cb6b439a 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -42,10 +42,10 @@
 /* Threshold to change BTR multiplier (to avoid frequent changes) */
 #define BTR_DRIFT_MARGIN 2000
 /* Threshold to exit fixed refresh rate */
-#define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 4
+#define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 1
 /* Number of consecutive frames to check before entering/exiting fixed refresh 
*/
 #define FIXED_REFRESH_ENTER_FRAME_COUNT 5
-#define FIXED_REFRESH_EXIT_FRAME_COUNT 5
+#define FIXED_REFRESH_EXIT_FRAME_COUNT 10
 
 struct core_freesync {
        struct mod_freesync public;
@@ -420,7 +420,8 @@ static void apply_fixed_refresh(struct core_freesync 
*core_freesync,
                                in_out_vrr->fixed.target_refresh_in_uhz = 0;
                                update = true;
                        }
-               }
+               } else
+                       in_out_vrr->fixed.frame_counter = 0;
        } else if (last_render_time_in_us > max_render_time_in_us) {
                /* Enter Fixed Refresh mode */
                if (!in_out_vrr->fixed.fixed_active) {
@@ -434,7 +435,8 @@ static void apply_fixed_refresh(struct core_freesync 
*core_freesync,
                                                in_out_vrr->max_refresh_in_uhz;
                                update = true;
                        }
-               }
+               } else
+                       in_out_vrr->fixed.frame_counter = 0;
        }
 
        if (update) {
-- 
2.25.1

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