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s3c2410fb: fix clockrate calculation 

In the final part of the calculation for the tft display clockrate we
divide the output pf s3c2410fb_calc_pixclk() by 2 which leaves us with a
rounding error if the result is odd.

Change to using DIV_ROUND_UP() to ensure that we always choose a higher
divisor and thus a lower frequency.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ben Dooks 2009-09-22 16:47:43 -07:00 committed by Linus Torvalds
parent 9a4a83d2ed
commit 360fa58828
1 changed files with 3 additions and 1 deletions
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4
drivers/video/s3c2410fb.c
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@ -369,7 +369,9 @@ static void s3c2410fb_activate_var(struct fb_info *info)
void __iomem *regs = fbi->io;
int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
struct fb_var_screeninfo *var = &info->var;
int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock) / 2;
int clkdiv;
clkdiv = DIV_ROUND_UP(s3c2410fb_calc_pixclk(fbi, var->pixclock), 2);
dprintk("%s: var->xres = %d\n", __func__, var->xres);
dprintk("%s: var->yres = %d\n", __func__, var->yres);