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cirrusfb: simplify clock calculation

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Simplify clock calculation.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2008-10-15 22:03:36 -07:00 committed by Linus Torvalds
parent 786e463e7f
commit 7528f54388
1 changed files with 19 additions and 21 deletions
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40
drivers/video/cirrusfb.c
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@ -3075,38 +3075,36 @@ static void bestclock(long freq, long *best, long *nom,
f = freq * 10;
for (n = 32; n < 128; n++) {
int s = 0;
d = (143181 * n) / f;
if ((d >= 7) && (d <= 63)) {
if (d > 31)
d = (d / 2) * 2;
h = (14318 * n) / d;
int temp = d;
if (temp > 31) {
s = 1;
temp >>= 1;
}
h = ((14318 * n) / temp) >> s;
if (abs(h - freq) < abs(*best - freq)) {
*best = h;
*nom = n;
if (d < 32) {
*den = d;
*div = 0;
} else {
*den = d / 2;
*div = 1;
}
*den = temp;
*div = s;
}
}
d = DIV_ROUND_UP(143181 * n, f);
d++;
if ((d >= 7) && (d <= 63)) {
if (d > 31)
d = (d / 2) * 2;
h = (14318 * n) / d;
if (d > 31) {
s = 1;
d >>= 1;
}
h = ((14318 * n) / d) >> s;
if (abs(h - freq) < abs(*best - freq)) {
*best = h;
*nom = n;
if (d < 32) {
*den = d;
*div = 0;
} else {
*den = d / 2;
*div = 1;
}
*den = d;
*div = s;
}
}
}