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s3fb: do not allow incorrect pixclock settings

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This patch adds check if selected pixclock is valid (is in the PLL range).

Previously, if the pixclock could not be set, the new mode resolution was set
but pixclock was not set which led to incorrect timings sent to monitor.

[adaplas]
Fixed a few misplaced curly braces.

Signed-off-by: Krzysztof Helt <[email protected]>
Signed-off-by: Antonino Daplas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Krzysztof Helt 2007-10-16 01:29:54 -07:00 • committed by Linus Torvalds
commit c3ca34f90b
1 changed files with 11 additions and 4 deletions
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15
drivers/video/s3fb.c
View file

@ -400,6 +400,7 @@ static int s3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct s3fb_info *par = info->par;
int rv, mem, step;
u16 m, n, r;
/* Find appropriate format */
rv = svga_match_format (s3fb_formats, var, NULL);
@ -427,20 +428,26 @@ static int s3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
/* Check whether have enough memory */
mem = ((var->bits_per_pixel * var->xres_virtual) >> 3) * var->yres_virtual;
if (mem > info->screen_size)
{
if (mem > info->screen_size) {
printk(KERN_ERR "fb%d: not enough framebuffer memory (%d kB requested , %d kB available)\n",
info->node, mem >> 10, (unsigned int) (info->screen_size >> 10));
return -EINVAL;
}
rv = svga_check_timings (&s3_timing_regs, var, info->node);
if (rv < 0)
{
if (rv < 0) {
printk(KERN_ERR "fb%d: invalid timings requested\n", info->node);
return rv;
}
rv = svga_compute_pll(&s3_pll, PICOS2KHZ(var->pixclock), &m, &n, &r,
info->node);
if (rv < 0) {
printk(KERN_ERR "fb%d: invalid pixclock value requested\n",
info->node);
return rv;
}
return 0;
}