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authorKrzysztof Helt <krzysztof.h1@wp.pl>2007-10-16 01:29:54 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:23 -0700
commitc3ca34f90b44049dcde62a8f97554409112bf376 (patch)
treee29782c415a1580febf0407a2c603233f6833a58 /drivers/video/s3fb.c
parentd4b766a0bdab8d07b720c8d0a84292949a7d58bd (diff)
s3fb: do not allow incorrect pixclock settings
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 <krzysztof.h1@wp.pl> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/s3fb.c')
-rw-r--r--drivers/video/s3fb.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/video/s3fb.c b/drivers/video/s3fb.c
index a96ac4392173..7d53bc23b9c7 100644
--- a/drivers/video/s3fb.c
+++ b/drivers/video/s3fb.c
@@ -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;
}

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