On Sun, 31 Jul 2005, Antonino A. Daplas wrote:
> Knut Petersen wrote:
> > + //
> > + // interlaced modes are broken, fail if one is requested
> > + //
> > + if (var->vmode & FB_VMODE_INTERLACED)
> > + return -EINVAL;
>
> You are too strict :-) You can always clear FB_VMODE_INTERLACED and
> return success. This is acceptable behavior.
I would not try to modify the passed FB_VMODE_* flags.
> > + //
> > + // fail if requested resolution is higher than physical
> > + // flatpanel resolution
> > + //
> > + if (flatpanel && nativex && var->xres > nativex)
> > + return -EINVAL;
> > +
>
> This is acceptable behavior, but you can always return
> with var->xres = nativex.
>
> > + //
> > + // xres != xres_virtual is broken, fail if such an
> > + // unusual mode is requested
> > + //
> > + if (var->xres != var->xres_virtual)
> > + return -EINVAL;
>
> Same here, var->xres = var->xres_virtual.
Only when rounding _up_. Rounding down is not allowed.
> > + // calc max yres_virtual that would fit in memory
> > + // and max yres_virtual that could be used for scrolling
> > + // and use minimum of the results as maxvyres
> > + //
> > + // adjust vyres_virtual to maxvyres if necessary
> > + // fail if requested yres is bigger than maxvyres
> > + //
> > + s = (0x1fffff / (var->xres * bpp/8)) + var->yres;
> > + t = info->fix.smem_len / (var->xres * bpp/8);
> > + maxvyres = t < s ? t : s;
> > + if (maxvyres < var->yres_virtual)
> > + var->yres_virtual=maxvyres;
> > + if (maxvyres < var->yres)
> > + return -EINVAL;
> > +
> > + switch (bpp) {
> > + case 8:
> > + var->red.offset = 0;
> > + var->green.offset = 0;
> > + var->blue.offset = 0;
> > + var->red.length = 6;
> > + var->green.length = 6;
> > + var->blue.length = 6;
> > + break;
> > + case 16:
> > + var->red.offset = 11;
> > + var->green.offset = 5;
> > + var->blue.offset = 0;
> > + var->red.length = 5;
> > + var->green.length = 6;
> > + var->blue.length = 5;
> > + break;
> > + case 32:
> > + var->red.offset = 16;
> > + var->green.offset = 8;
> > + var->blue.offset = 0;
> > + var->red.length = 8;
> > + var->green.length = 8;
> > + var->blue.length = 8;
> > + break;
> > + default:
> > + return -EINVAL;
> Again, you can always round off bits_per_pixel to
> ones that the driver can support.
Only when rounding _up_.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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