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tridentfb: improve check_var function 

Do some additional checks (like pixelclock versus ramdac speed) to
eliminate modes which do not work.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2008-07-23 21:31:00 -07:00 committed by Linus Torvalds
parent aa0aa8ab2f
commit 74a933feaf
1 changed files with 34 additions and 0 deletions
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34
drivers/video/tridentfb.c
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@ -829,6 +829,7 @@ static int tridentfb_check_var(struct fb_var_screeninfo *var,
{
struct tridentfb_par *par = info->par;
int bpp = var->bits_per_pixel;
int ramdac = 230000; /* 230MHz for most 3D chips */
debug("enter\n");
/* check color depth */
@ -837,6 +838,12 @@ static int tridentfb_check_var(struct fb_var_screeninfo *var,
/* check whether resolution fits on panel and in memory */
if (par->flatpanel && nativex && var->xres > nativex)
return -EINVAL;
/* various resolution checks */
var->xres = (var->xres + 7) & ~0x7;
if (var->xres != var->xres_virtual)
var->xres_virtual = var->xres;
if (var->yres > var->yres_virtual)
var->yres_virtual = var->yres;
if (var->xres * var->yres_virtual * bpp / 8 > info->fix.smem_len)
return -EINVAL;
@ -868,6 +875,33 @@ static int tridentfb_check_var(struct fb_var_screeninfo *var,
default:
return -EINVAL;
}
if (is_xp(par->chip_id))
ramdac = 350000;
switch (par->chip_id) {
case TGUI9440:
ramdac = 90000;
break;
case CYBER9320:
case TGUI9660:
ramdac = 135000;
break;
case PROVIDIA9685:
case CYBER9388:
case CYBER9382:
case CYBER9385:
ramdac = 170000;
break;
}
/* The clock is doubled for 32 bpp */
if (bpp == 32)
ramdac /= 2;
if (PICOS2KHZ(var->pixclock) > ramdac)
return -EINVAL;
debug("exit\n");
return 0;