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drm/amd/display: Freesync does not engage on some displays

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[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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harmanprit Tatla 2018-09-24 16:46:38 -04:00 committed by Alex Deucher
parent 9566b67586
commit de801062bf
1 changed files with 9 additions and 28 deletions
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35
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
View File

@ -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;
}
}
}
/* 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++;