Commit be922ff7 authored by Anthony Koo's avatar Anthony Koo Committed by Alex Deucher
Browse files

drm/amd/display: Add back code to allow for rounding error 



Signed-off-by: default avatarAnthony Koo <Anthony.Koo@amd.com>
Reviewed-by: default avatarAric Cyr <Aric.Cyr@amd.com>
Acked-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 050790cc

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

+12 −1
Original line number Diff line number Diff line
@@ -896,6 +896,17 @@ bool mod_freesync_is_valid_range(struct mod_freesync *mod_freesync, 
	unsigned long long nominal_field_rate_in_uhz =

			mod_freesync_calc_nominal_field_rate(stream);



	/* Allow for some rounding error of actual video timing by taking ceil.

	 * For example, 144 Hz mode timing may actually be 143.xxx Hz when

	 * calculated from pixel rate and vertical/horizontal totals, but

	 * this should be allowed instead of blocking FreeSync.

	 */

	nominal_field_rate_in_uhz = div_u64(nominal_field_rate_in_uhz, 1000000);

	min_refresh_cap_in_uhz /= 1000000;

	max_refresh_cap_in_uhz /= 1000000;

	min_refresh_request_in_uhz /= 1000000;

	max_refresh_request_in_uhz /= 1000000;



	// Check nominal is within range

	if (nominal_field_rate_in_uhz > max_refresh_cap_in_uhz ||

		nominal_field_rate_in_uhz < min_refresh_cap_in_uhz)
@@ -921,7 +932,7 @@ bool mod_freesync_is_valid_range(struct mod_freesync *mod_freesync, 


	// For variable range, check for at least 10 Hz range

	if ((max_refresh_request_in_uhz != min_refresh_request_in_uhz) &&

		(max_refresh_request_in_uhz - min_refresh_request_in_uhz < 10000000))

		(max_refresh_request_in_uhz - min_refresh_request_in_uhz < 10))

		return false;



	return true;