Hi Laurent,
On Fri, Nov 23, 2012 at 11:53:10AM +0100, Laurent Pinchart wrote:
> Hi Steffen,
>
> On Friday 23 November 2012 10:04:24 Steffen Trumtrar wrote:
> > Add a function to convert from the generic videomode to a fb_videomode.
> >
> > Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
> > Reviewed-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
> > Acked-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
> > Tested-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
> > Tested-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> > Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/video/fbmon.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/fb.h | 6 ++++++
> > 2 files changed, 55 insertions(+)
> >
> > diff --git a/drivers/video/fbmon.c b/drivers/video/fbmon.c
> > index cef6557..bcbfe8f 100644
> > --- a/drivers/video/fbmon.c
> > +++ b/drivers/video/fbmon.c
> > @@ -31,6 +31,7 @@
> > #include <linux/pci.h>
> > #include <linux/slab.h>
> > #include <video/edid.h>
> > +#include <linux/videomode.h>
>
> You could move this one line up to keep headers sorted alphabetically
> (assuming they are in the first place).
>
Because of the careless mistake below, I will do that.
> > #ifdef CONFIG_PPC_OF
> > #include <asm/prom.h>
> > #include <asm/pci-bridge.h>
> > @@ -1373,6 +1374,54 @@ int fb_get_mode(int flags, u32 val, struct
> > fb_var_screeninfo *var, struct fb_inf kfree(timings);
> > return err;
> > }
> > +
> > +#if IS_ENABLED(CONFIG_VIDEOMODE)
> > +int fb_videomode_from_videomode(const struct videomode *vm,
> > + struct fb_videomode *fbmode)
>
> This is inside the #if CONFIG_FB_MODE_HELPERS block, is that intentional ?
>
Yes. Intentional. It is a fb_mode helper, that is why ... oh, wait. I should
add a "depends on" to the Kconfig then.
> > +{
> > + unsigned int htotal, vtotal;
> > +
> > + 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;
> > +
> > + /* prevent division by zero in KHZ2PICOS macro */
> > + fbmode->pixclock = vm->pixelclock ? KHZ2PICOS(vm->pixelclock / 1000) : 0;
> > +
> > + 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;
> > + fbmode->flag = 0;
> > +
> > + htotal = vm->hactive + vm->hfront_porch + vm->hback_porch +
> > + vm->hsync_len;
> > + vtotal = vm->vactive + vm->vfront_porch + vm->vback_porch +
> > + vm->vsync_len;
> > + /* prevent division by zero */
> > + if (htotal && vtotal)
> > + fbmode->refresh = vm->pixelclock / (htotal * vtotal);
> > + else
> > + fbmode->refresh = vm->pixelclock;
>
> What about returning an error if htotal * vtotal == 0 ? The input is clearly
> invalid in that case. I would then set fbmode->refresh to 0, setting it to vm-
> >pixelclock doesn't really make sense.
>
Yes, pixelclock makes no sense. It was supposed to be 0. I was careless here.
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(fb_videomode_from_videomode);
> > +#endif
> > +
> > +
>
> A single blank line should be enough.
>
Regards,
Steffen
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