# Re: \[PATCH/RFC v2 3/3\] fbdev: sh\_mobile\_lcdc: Support FOURCC-based format API

- From: Laurent Pinchart \<laurent.pinchart@ideasonboard.com\>
- Date: 2011-08-28 08:58:36 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2011/08/8345091
- Thread: https://ratatoskr.run/linux-fbdev/2011/08/8344836/t.md

```text
Hi Florian,

Thanks for the review.

On Friday 26 August 2011 19:24:02 Florian Tobias Schandinat wrote:
> On 08/19/2011 09:37 AM, Laurent Pinchart wrote:

[snip]

> > diff --git a/drivers/video/sh_mobile_lcdcfb.c
> > b/drivers/video/sh_mobile_lcdcfb.c index 97ab8ba..ea3f619 100644
> > --- a/drivers/video/sh_mobile_lcdcfb.c
> > +++ b/drivers/video/sh_mobile_lcdcfb.c

[snip]

> > @@ -1099,51 +1154,78 @@ static int sh_mobile_check_var(struct

[snip]

> > +	if (var->format.fourcc > 1) {
> > +		switch (var->format.fourcc) {
> > +		case V4L2_PIX_FMT_NV12:
> > +		case V4L2_PIX_FMT_NV21:
> > +			var->bits_per_pixel = 12;
> > +			break;
> > +		case V4L2_PIX_FMT_RGB565:
> > +		case V4L2_PIX_FMT_NV16:
> > +		case V4L2_PIX_FMT_NV61:
> > +			var->bits_per_pixel = 16;
> > +			break;
> > +		case V4L2_PIX_FMT_BGR24:
> > +		case V4L2_PIX_FMT_NV24:
> > +		case V4L2_PIX_FMT_NV42:
> > +			var->bits_per_pixel = 24;
> > +			break;
> > +		case V4L2_PIX_FMT_BGR32:
> > +			var->bits_per_pixel = 32;
> > +			break;
> > +		default:
> > +			return -EINVAL;
> > +		}
> > +
> > +		memset(var->format.reserved, 0, sizeof(var->format.reserved));
> 
> If we decide to use another of the reserved area this won't have the
> desired behavior as the behavior of this driver will change even if it
> does not support the new field. Probably the best thing is to get the
> desired behavior is zeroing the whole struct and setting the supported
> fields to the actual values. You should check and adjust colorspace here
> as well.

Agreed. I'll fix the patch accordingly.

-- 
Regards,

Laurent Pinchart
```