[PATCH 12/15] s3fb: do not allow incorrect pixclock settings

[Antonino Daplas <adaplas@gmail.com>]

From: Krzysztof Helt <krzysztof.h1@wp.pl>

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>
---

 drivers/video/s3fb.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/video/s3fb.c b/drivers/video/s3fb.c
index a96ac43..7d53bc2 100644
--- a/drivers/video/s3fb.c
+++ b/drivers/video/s3fb.c
@@ -400,6 +400,7 @@ static int s3fb_check_var(struct fb_var_
 {
 	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_
 
 	/* 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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