linux-kernel - Re: [PATCH v5 3/9] vcodec: mediatek: Add Mediatek V4L2 Video Decoder Driver

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Message-ID: <20161021110809.269fd70d@vento.lan>
Date:   Fri, 21 Oct 2016 11:08:09 -0200
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Tiffany Lin <tiffany.lin@...iatek.com>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        <daniel.thompson@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Pawel Osciak <posciak@...omium.org>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-media@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <PoChun.Lin@...iatek.com>
Subject: Re: [PATCH v5 3/9] vcodec: mediatek: Add Mediatek V4L2 Video
 Decoder Driver

Em Fri, 21 Oct 2016 11:01:04 -0200
Mauro Carvalho Chehab <mchehab@....samsung.com> escreveu:

> Em Fri, 2 Sep 2016 20:19:54 +0800
> Tiffany Lin <tiffany.lin@...iatek.com> escreveu:
> 
> > Add v4l2 layer decoder driver for MT8173
> > 
> > Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>  
> 
> > +int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
> > +{
> > +	int ret = 0;
> > +
> > +	switch (fourcc) {
> > +	case V4L2_PIX_FMT_H264:
> > +	case V4L2_PIX_FMT_VP8:
> > +	default:
> > +		return -EINVAL;
> > +	}  
> 
> Did you ever test this driver? The above code will *always* return
> -EINVAL, with will cause vidioc_vdec_s_fmt() to always fail!
> 
> I suspect that what you wanted to do, instead, is:
> 
> 	switch (fourcc) {
> 	case V4L2_PIX_FMT_H264:
> 	case V4L2_PIX_FMT_VP8:
> 		break;
> 	default:
> 		return -EINVAL;

Yeah, a latter patch in this series added a break there.

Thanks,
Mauro