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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>
This commit is contained in:
Dave Airlie 2006-03-20 20:54:12 +11:00
parent d024960cff
commit 8492f081e5
1 changed files with 13 additions and 11 deletions
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24
drivers/video/intelfb/intelfbhw.c
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@ -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. */