intelfb: change splitm to be brute force

The old splitm didn't always work use a brute force.

Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c
index bf742aa..d529219 100644 (file)
--- a/drivers/video/intelfb/intelfbhw.c
+++ b/drivers/video/intelfb/intelfbhw.c
@@ -746,20 +746,22 @@ static int
 splitm(int index, unsigned int m, unsigned int *retm1, unsigned int *retm2)
 {
        int m1, m2;
-
-       m1 = (m - 2 - (plls[index].min_m1 + plls[index].max_m2) / 2) / 5 - 2;
-       if (m1 < plls[index].min_m1)
-               m1 = plls[index].min_m1;
-       if (m1 > plls[index].max_m1)
-               m1 = plls[index].max_m1;
-       m2 = m - 5 * (m1 + 2) - 2;
-       if (m2 < plls[index].min_m2 || m2 > plls[index].max_m2 || m2 >= m1) {
-               return 1;
-       } else {
+       int testm;
+       /* no point optimising too much - brute force m */
+       for (m1 = plls[index].min_m1; m1 < plls[index].max_m1+1; m1++)
+       {
+         for (m2 = plls[index].min_m2; m2 < plls[index].max_m2+1; m2++)
+         {
+           testm  = ( 5 * ( m1 + 2 )) + (m2 + 2);
+           if (testm == m)
+           {
                *retm1 = (unsigned int)m1;
-               *retm2 = (unsigned int)m2;
+               *retm2 = (unsigned int)m2;            
                return 0;
+           }
+         }
        }
+       return 1;
 }
 
 /* Split the P parameter into P1 and P2. */