linux-kernel - Re: [PATCH] media: cedrus: Propagate OUTPUT resolution to CAPTURE

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Message-ID: <20200715135145.GA2019248@aptenodytes>
Date:   Wed, 15 Jul 2020 15:51:45 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Hans Verkuil <hverkuil@...all.nl>, stable@...r.kernel.org,
        kernel@...labora.com, Maxime Ripard <mripard@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: cedrus: Propagate OUTPUT resolution to CAPTURE

Hi,

On Wed 15 Jul 20, 08:57, Ezequiel Garcia wrote:
> It seems this one felt thru the cracks. Sorry for the delay.
> 
> On Thu, 2020-05-14 at 11:39 -0400, Nicolas Dufresne wrote:
> > As per spec, the CAPTURE resolution should be automatically set based on
> > the OTUPUT resolution. This patch properly propagate width/height to the
> > capture when the OUTPUT format is set and override the user provided
> > width/height with configured OUTPUT resolution when the CAPTURE fmt is
> > updated.
> > 
> > This also prevents userspace from selecting a CAPTURE resolution that is
> > too small, avoiding unwanted page faults.
> > 
> > Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> 
> This looks correct.

Looks like there's no issue with alignment (that will get applied as well),
which was a possible concern.

Thanks for reviewing!

Acked-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Cheers,

Paul

> Reviewed-by: Ezequiel Garcia <ezequiel@...labora.com>
> 
> Thanks,
> Ezequiel
> 
> > ---
> >  drivers/staging/media/sunxi/cedrus/cedrus_video.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
> > index 16d82309e7b6..a6d6b15adc2e 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
> > @@ -247,6 +247,8 @@ static int cedrus_try_fmt_vid_cap(struct file *file, void *priv,
> >  		return -EINVAL;
> >  
> >  	pix_fmt->pixelformat = fmt->pixelformat;
> > +	pix_fmt->width = ctx->src_fmt.width;
> > +	pix_fmt->height = ctx->src_fmt.height;
> >  	cedrus_prepare_format(pix_fmt);
> >  
> >  	return 0;
> > @@ -319,11 +321,14 @@ static int cedrus_s_fmt_vid_out(struct file *file, void *priv,
> >  		break;
> >  	}
> >  
> > -	/* Propagate colorspace information to capture. */
> > +	/* Propagate format information to capture. */
> >  	ctx->dst_fmt.colorspace = f->fmt.pix.colorspace;
> >  	ctx->dst_fmt.xfer_func = f->fmt.pix.xfer_func;
> >  	ctx->dst_fmt.ycbcr_enc = f->fmt.pix.ycbcr_enc;
> >  	ctx->dst_fmt.quantization = f->fmt.pix.quantization;
> > +	ctx->dst_fmt.width = ctx->src_fmt.width;
> > +	ctx->dst_fmt.height = ctx->src_fmt.height;
> > +	cedrus_prepare_format(&ctx->dst_fmt);
> >  
> >  	return 0;
> >  }
> > -- 
> > 2.26.2
> > 
> > 
> 
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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