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drm/amd/display: Fix frames_to_insert math

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[Why]
The math on deciding on how many
"frames to insert" sometimes sent us over the max refresh rate.
Also integer overflow can occur if we have high refresh rates.

[How]
Instead of clipping the  frame duration such that it doesn’t go below the min,
just remove a frame from the number of frames to insert. +
Use unsigned long long for intermediate calculations to prevent
integer overflow.

Signed-off-by: Bayan Zabihiyan <bayan.zabihiyan@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Bayan Zabihiyan 2019-07-10 16:00:53 -04:00 committed by Alex Deucher
parent 1cbcfc9751
commit a463b26303
1 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/gpu/drm/amd/display/modules/freesync/freesync.c
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@ -435,6 +435,12 @@ static void apply_below_the_range(struct core_freesync *core_freesync,
/* Either we've calculated the number of frames to insert,
* or we need to insert min duration frames
*/
if (last_render_time_in_us / frames_to_insert <
in_out_vrr->min_duration_in_us){
frames_to_insert -= (frames_to_insert > 1) ?
1 : 0;
}
if (frames_to_insert > 0)
inserted_frame_duration_in_us = last_render_time_in_us /
frames_to_insert;
@ -887,8 +893,8 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
struct core_freesync *core_freesync = NULL;
unsigned long long nominal_field_rate_in_uhz = 0;
unsigned int refresh_range = 0;
unsigned int min_refresh_in_uhz = 0;
unsigned int max_refresh_in_uhz = 0;
unsigned long long min_refresh_in_uhz = 0;
unsigned long long max_refresh_in_uhz = 0;
if (mod_freesync == NULL)
return;
@ -915,7 +921,7 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
min_refresh_in_uhz = nominal_field_rate_in_uhz;
if (!vrr_settings_require_update(core_freesync,
in_config, min_refresh_in_uhz, max_refresh_in_uhz,
in_config, (unsigned int)min_refresh_in_uhz, (unsigned int)max_refresh_in_uhz,
in_out_vrr))
return;
@ -931,15 +937,15 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
return;
} else {
in_out_vrr->min_refresh_in_uhz = min_refresh_in_uhz;
in_out_vrr->min_refresh_in_uhz = (unsigned int)min_refresh_in_uhz;
in_out_vrr->max_duration_in_us =
calc_duration_in_us_from_refresh_in_uhz(
min_refresh_in_uhz);
(unsigned int)min_refresh_in_uhz);
in_out_vrr->max_refresh_in_uhz = max_refresh_in_uhz;
in_out_vrr->max_refresh_in_uhz = (unsigned int)max_refresh_in_uhz;
in_out_vrr->min_duration_in_us =
calc_duration_in_us_from_refresh_in_uhz(
max_refresh_in_uhz);
(unsigned int)max_refresh_in_uhz);
refresh_range = in_out_vrr->max_refresh_in_uhz -
in_out_vrr->min_refresh_in_uhz;
@ -950,17 +956,18 @@ void mod_freesync_build_vrr_params(struct mod_freesync *mod_freesync,
in_out_vrr->fixed.ramping_active = in_config->ramping;
in_out_vrr->btr.btr_enabled = in_config->btr;
if (in_out_vrr->max_refresh_in_uhz <
2 * in_out_vrr->min_refresh_in_uhz)
in_out_vrr->btr.btr_enabled = false;
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;
in_out_vrr->btr.mid_point_in_us =
in_out_vrr->min_duration_in_us +
(in_out_vrr->max_duration_in_us -
in_out_vrr->min_duration_in_us) / 2;
(in_out_vrr->min_duration_in_us +
in_out_vrr->max_duration_in_us) / 2;
if (in_out_vrr->state == VRR_STATE_UNSUPPORTED) {
in_out_vrr->adjust.v_total_min = stream->timing.v_total;