cirrusfb: simplify clock calculation

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>

drivers/video/cirrusfb.c

@@ -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;
 			}
 		}
 	}