Commit 8492f081 authored by Dave Airlie's avatar Dave Airlie
Browse files

intelfb: change splitm to be brute force 



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

Signed-off-by: default avatarDave Airlie <airlied@linux.ie>
parent d024960c

drivers/video/intelfb/intelfbhw.c

+13 −11
Original line number Diff line number Diff line
@@ -746,21 +746,23 @@ 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;	      

		return 0;

	    }

	  }

	}

	return 1;

}



/* Split the P parameter into P1 and P2. */

static int