2 * Copyright 2011 Linaro Limited
3 * Aneesh V <aneesh@ti.com>
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
24 static void do_cancel_out(u32 *num, u32 *den, u32 factor)
27 if (((*num)/factor*factor == (*num)) &&
28 ((*den)/factor*factor == (*den))) {
37 * Cancel out the denominator and numerator of a fraction
38 * to get smaller numerator and denominator.
40 void cancel_out(u32 *num, u32 *den, u32 den_limit)
42 do_cancel_out(num, den, 2);
43 do_cancel_out(num, den, 3);
44 do_cancel_out(num, den, 5);
45 do_cancel_out(num, den, 7);
46 do_cancel_out(num, den, 11);
47 do_cancel_out(num, den, 13);
48 do_cancel_out(num, den, 17);
49 while ((*den) > den_limit) {
52 * Round up the denominator so that the final fraction
53 * (num/den) is always <= the desired value
55 *den = (*den + 1) / 2;