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>

1 files changed, 19 insertions, 21 deletions

diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 09f42145a5db..dfd12a2dfe72 100644
--- a/drivers/video/cirrusfb.c
+++ b/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;
                         }
                 }
         }