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From 0a3ef6af83b114bcf85da1f51720498fc9374285 Mon Sep 17 00:00:00 2001
From: Harmanprit Tatla <htatla@amd.com>
Date: Mon, 24 Sep 2018 16:46:38 -0400
Subject: [PATCH 0538/2940] drm/amd/display: Freesync does not engage on some
displays
[Why]
Current render margin time is not sufficient to compute exit frame
time for most monitors.
[How]
Declared render margin in FPS to compute a exit frame rate that is
4 FPS above the minimum FPS required to engage FreeSync.
Also did code clean-up to remove redundancies.
Signed-off-by: Harmanprit Tatla <htatla@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
---
.../amd/display/modules/freesync/freesync.c | 37 +++++--------------
1 file changed, 9 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index 4018c7180d00..620a171620ee 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -37,6 +37,8 @@
#define RENDER_TIMES_MAX_COUNT 10
/* Threshold to exit BTR (to avoid frequent enter-exits at the lower limit) */
#define BTR_EXIT_MARGIN 2000
+/*Threshold to exit fixed refresh rate*/
+#define FIXED_REFRESH_EXIT_MARGIN_IN_HZ 4
/* 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
@@ -257,40 +259,14 @@ static void apply_below_the_range(struct core_freesync *core_freesync,
if (in_out_vrr->btr.btr_active) {
in_out_vrr->btr.frame_counter = 0;
in_out_vrr->btr.btr_active = false;
-
- /* Exit Fixed Refresh mode */
- } else if (in_out_vrr->fixed.fixed_active) {
-
- in_out_vrr->fixed.frame_counter++;
-
- if (in_out_vrr->fixed.frame_counter >
- FIXED_REFRESH_EXIT_FRAME_COUNT) {
- in_out_vrr->fixed.frame_counter = 0;
- in_out_vrr->fixed.fixed_active = false;
- }
}
} else if (last_render_time_in_us > max_render_time_in_us) {
/* Enter Below the Range */
- if (!in_out_vrr->btr.btr_active &&
- in_out_vrr->btr.btr_enabled) {
- in_out_vrr->btr.btr_active = true;
-
- /* Enter Fixed Refresh mode */
- } else if (!in_out_vrr->fixed.fixed_active &&
- !in_out_vrr->btr.btr_enabled) {
- in_out_vrr->fixed.frame_counter++;
-
- if (in_out_vrr->fixed.frame_counter >
- FIXED_REFRESH_ENTER_FRAME_COUNT) {
- in_out_vrr->fixed.frame_counter = 0;
- in_out_vrr->fixed.fixed_active = true;
- }
- }
+ in_out_vrr->btr.btr_active = true;
}
/* BTR set to "not active" so disengage */
if (!in_out_vrr->btr.btr_active) {
- in_out_vrr->btr.btr_active = false;
in_out_vrr->btr.inserted_duration_in_us = 0;
in_out_vrr->btr.frames_to_insert = 0;
in_out_vrr->btr.frame_counter = 0;
@@ -375,7 +351,12 @@ static void apply_fixed_refresh(struct core_freesync *core_freesync,
bool update = false;
unsigned int max_render_time_in_us = in_out_vrr->max_duration_in_us;
- if (last_render_time_in_us + BTR_EXIT_MARGIN < max_render_time_in_us) {
+ //Compute the exit refresh rate and exit frame duration
+ unsigned int exit_refresh_rate_in_milli_hz = ((1000000000/max_render_time_in_us)
+ + (1000*FIXED_REFRESH_EXIT_MARGIN_IN_HZ));
+ unsigned int exit_frame_duration_in_us = 1000000000/exit_refresh_rate_in_milli_hz;
+
+ if (last_render_time_in_us < exit_frame_duration_in_us) {
/* Exit Fixed Refresh mode */
if (in_out_vrr->fixed.fixed_active) {
in_out_vrr->fixed.frame_counter++;
--
2.17.1
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