linux-kernel - Re: [PATCH 08/11] media: cedrus: prefer untiled capture format

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Message-ID: <4749341.GXAFRqVoOG@jernej-laptop>
Date:   Tue, 25 Oct 2022 17:15:26 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     mripard@...nel.org, mchehab@...nel.org, gregkh@...uxfoundation.org,
        wens@...e.org, samuel@...lland.org, hverkuil-cisco@...all.nl,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/11] media: cedrus: prefer untiled capture format

Dne torek, 25. oktober 2022 ob 17:05:16 CEST je Paul Kocialkowski napisal(a):
> Hi Jernej,
> 
> On Mon 24 Oct 22, 22:15, Jernej Skrabec wrote:
> > While all generations of display engine on Allwinner SoCs support
> > untiled format, only first generation supports tiled format.  Let's
> > move untiled format up, so it can be picked before tiled one. If
> > Cedrus variant doesn't support untiled format, tiled will still be
> > picked as default format.
> 
> Makes sense to me. Of course the order shouldn't matter to smart-enough
> userspace but it doesn't hurt to serve the most generic case first.

Per Documentation/userspace-api/media/v4l/dev-stateless-decoder.rst driver 
should select most appropriate format for current platform by default. Setting 
capture format is optional by aforementioned document.

Best regards,
Jernej

> 
> Acked-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> 
> Cheers,
> 
> Paul
> 
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> > ---
> > 
> >  drivers/staging/media/sunxi/cedrus/cedrus_video.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
> > b/drivers/staging/media/sunxi/cedrus/cedrus_video.c index
> > 3591bf9d7d9c..f9f723ea3f79 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_video.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.c
> > @@ -56,13 +56,13 @@ static struct cedrus_format cedrus_formats[] = {
> > 
> >  		.capabilities	= CEDRUS_CAPABILITY_VP8_DEC,
> >  	
> >  	},
> >  	{
> > 
> > -		.pixelformat	= V4L2_PIX_FMT_NV12_32L32,
> > +		.pixelformat	= V4L2_PIX_FMT_NV12,
> > 
> >  		.directions	= CEDRUS_DECODE_DST,
> > 
> > +		.capabilities	= CEDRUS_CAPABILITY_UNTILED,
> > 
> >  	},
> >  	{
> > 
> > -		.pixelformat	= V4L2_PIX_FMT_NV12,
> > +		.pixelformat	= V4L2_PIX_FMT_NV12_32L32,
> > 
> >  		.directions	= CEDRUS_DECODE_DST,
> > 
> > -		.capabilities	= CEDRUS_CAPABILITY_UNTILED,
> > 
> >  	},
> >  
> >  };