> Framebuffer support for the Silicon Motion SM501
> multi-function chip.
>
> This driver provides a pair of framebuffer interfaces
> for the CRT and LCD panel interfaces, and some basic
> acceleration for the cursor.
>
> The patch has been updated slightly from the previous
> version to including being able to pass an initial
> video mode through via the platform data.
>
> Signed-off-by: Ben Dooks <[email protected]>
> Signed-off-by: Vincent Sanders <[email protected]>
> + *
> + * Converts a period in picoseconds to Hz.
> + *
> + * Note, we try to keep this in Hz to minimise rounding with
> + * the limited PLL settings on the SM501.
> +*/
> +
> +static unsigned long sm501fb_ps_to_hz(unsigned long psvalue)
> +{
> + unsigned long long numerator=1000000000000ULL;
> +
> + /* 10^12 / picosecond period gives frequency in Hz */
> + do_div(numerator, psvalue);
> + return (unsigned long)numerator;
> +}
> +
> +/* sm501fb_hz_to_ps is identical to the oposite transform */
> +
> +#define sm501fb_hz_to_ps(x) sm501fb_ps_to_hz(x)
You really need it down to the Hz?
> +/* sm501fb_validate_pan
> + *
> + * check panning on a var
> +*/
> +
> +static inline int sm501fb_validate_pan(struct fb_var_screeninfo *var)
> +{
> + if (var->xoffset < 0 || var->yoffset < 0)
> + return 0;
> +
> + if (var->xoffset > (var->xres_virtual - var->xres) ||
> + var->yoffset > (var->yres_virtual - var->yres))
> + return 0;
> +
> + return 1;
> +}
Not needed. fb_pan_display in fbmem.c does this check for you :-)
> +/* framebuffer ops */
> +
> +static struct fb_ops sm501fb_ops_crt = {
> + .owner = THIS_MODULE,
> + .fb_check_var = sm501fb_check_var_crt,
> + .fb_set_par = sm501fb_set_par_crt,
> + .fb_blank = sm501fb_blank_crt,
> + .fb_setcolreg = sm501fb_setcolreg,
> + .fb_pan_display = sm501fb_pan_crt,
> + .fb_cursor = sm501fb_cursor,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> +};
> +
> +static struct fb_ops sm501fb_ops_pnl = {
> + .owner = THIS_MODULE,
> + .fb_check_var = sm501fb_check_var_pnl,
> + .fb_set_par = sm501fb_set_par_pnl,
> + .fb_pan_display = sm501fb_pan_pnl,
> + .fb_blank = sm501fb_blank_pnl,
> + .fb_setcolreg = sm501fb_setcolreg,
> + .fb_cursor = sm501fb_cursor,
> + .fb_fillrect = cfb_fillrect,
> + .fb_copyarea = cfb_copyarea,
> + .fb_imageblit = cfb_imageblit,
> +};
Many cards require a fb_sync function after/before they do a drawing
operation. I notice you don't have one. Is sm501fb_sync_regs equivalent to
that?
Other than that the driver looks great. Thank you.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
