From: Krzysztof Helt <redacted>
Do some additional checks (like pixelclock versus ramdac speed)
to eliminate modes which do not work.
Signed-off-by: Krzysztof Helt <redacted>
diff -urp linux-2.6.25/drivers/video/tridentfb.c linux-new/drivers/video/tridentfb.c
--- linux-2.6.25/drivers/video/tridentfb.c 2008-05-11 18:25:16.026663831 +0200
+++ linux-new/drivers/video/tridentfb.c 2008-05-11 18:26:19.574663241 +0200
@@ -829,6 +829,7 @@ static int tridentfb_check_var(struct fb
{
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
/* 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
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;
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