Commit a8a2e134 authored by Vladimir Stempen's avatar Vladimir Stempen Committed by Alex Deucher
Browse files

drm/amd/display: Fix 64 bit modulus operation using div64 API 



[why]
Synchronization displays with different timings feature uses
reminder of 64 bit division (modulus operator) , which is not
supported by 32 bit platforms

[how]
Use div64 API for 64 bit modulus

Signed-off-by: default avatarVladimir Stempen <vladimir.stempen@amd.com>
Tested-by: default avatarBindu <Ramamurthy&lt;bindu.r@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 783bf403

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

+10 −5
Original line number Diff line number Diff line
@@ -1893,16 +1893,21 @@ uint64_t reduceSizeAndFraction( 
	num = *numerator;

	denom = *denominator;

	for (i = 0; i < count; i++) {

		uint32_t num_reminder, denom_reminder;

		uint64_t num_result, denom_result;

		if (checkUint32Bounary &&

			num <= max_int32 && denom <= max_int32) {

			ret = true;

			break;

		}

		while (num % prime_numbers[i] == 0 &&

			   denom % prime_numbers[i] == 0) {

			num = div_u64(num, prime_numbers[i]);

			denom = div_u64(denom, prime_numbers[i]);

		do {

			num_result = div_u64_rem(num, prime_numbers[i], &num_reminder);

			denom_result = div_u64_rem(denom, prime_numbers[i], &denom_reminder);

			if (num_reminder == 0 && denom_reminder == 0) {

				num = num_result;

				denom = denom_result;

			}

		} while (num_reminder == 0 && denom_reminder == 0);

	}

	*numerator = num;

	*denominator = denom;