Re: [PATCH v8 3/6] fbmon: add videomode helpers

Steffen Trumtrar
2012-11-13T13:28:56Z

On Tue, Nov 13, 2012 at 12:22:58PM +0100, Thierry Reding wrote:
> On Mon, Nov 12, 2012 at 04:37:03PM +0100, Steffen Trumtrar wrote:
> [...]
> > +#if IS_ENABLED(CONFIG_VIDEOMODE)
> > +int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode)
>
> The other helpers are named <destination-type>_from_<source-type>(),
> maybe this should follow that example for consistency?
>

Hm, not a bad idea.

> > +{
> > + fbmode->xres = vm->hactive;
> > + fbmode->left_margin = vm->hback_porch;
> > + fbmode->right_margin = vm->hfront_porch;
> > + fbmode->hsync_len = vm->hsync_len;
> > +
> > + fbmode->yres = vm->vactive;
> > + fbmode->upper_margin = vm->vback_porch;
> > + fbmode->lower_margin = vm->vfront_porch;
> > + fbmode->vsync_len = vm->vsync_len;
> > +
> > + fbmode->pixclock = KHZ2PICOS(vm->pixelclock / 1000);
> > +
> > + fbmode->sync = 0;
> > + fbmode->vmode = 0;
> > + if (vm->hah)
> > + fbmode->sync |= FB_SYNC_HOR_HIGH_ACT;
> > + if (vm->vah)
> > + fbmode->sync |= FB_SYNC_VERT_HIGH_ACT;
> > + if (vm->interlaced)
> > + fbmode->vmode |= FB_VMODE_INTERLACED;
> > + if (vm->doublescan)
> > + fbmode->vmode |= FB_VMODE_DOUBLE;
> > + if (vm->de)
> > + fbmode->sync |= FB_SYNC_DATA_ENABLE_HIGH_ACT;
> > + fbmode->refresh = 60;
>
> Can the refresh rate not be computed from the pixel clock and the
> horizontal and vertical timings?
>

Yes. That totally got lost on the way.

> > + fbmode->flag = 0;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(videomode_to_fb_videomode);
> > +#endif
> > +
> > +
>
> There's a gratuitous blank line here.
>
> > #else
> > int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var)
> > {
> > diff --git a/include/linux/fb.h b/include/linux/fb.h
> > index c7a9571..46c665b 100644
> > --- a/include/linux/fb.h
> > +++ b/include/linux/fb.h
> > @@ -714,6 +714,8 @@ extern void fb_destroy_modedb(struct fb_videomode *modedb);
> > extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
> > extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
> >
> > +extern int videomode_to_fb_videomode(struct videomode *vm, struct fb_videomode *fbmode);
> > +
>
> Should you provide a dummy in the !CONFIG_VIDEOMODE case?
>

Okay

Steffen

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