linux-kernel - Re: [PATCH 02/10] drm/sun4i: Disable YUV channel when using the frontend and set interlace

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Date:   Tue, 27 Mar 2018 10:44:19 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sean Paul <seanpaul@...omium.org>
Subject: Re: [PATCH 02/10] drm/sun4i: Disable YUV channel when using the
 frontend and set interlace

Hi,

On Tue, 2018-03-27 at 10:17 +0200, Maxime Ripard wrote:
> On Tue, Mar 27, 2018 at 10:00:43AM +0200, Paul Kocialkowski wrote:
> > Hi,
> > 
> > On Fri, 2018-03-23 at 10:55 +0100, Maxime Ripard wrote:
> > > On Wed, Mar 21, 2018 at 04:28:56PM +0100, Paul Kocialkowski wrote:
> > > > The YUV channel was only disabled in
> > > > sun4i_backend_update_layer_formats,
> > > > which is not called when the frontend is selected.
> > > > 
> > > > Thus, creating a layer with a YUV format handled by the backend
> > > > and
> > > > then
> > > > switching to a format that requires the frontend would keep the
> > > > YUV
> > > > channel enabled for the layer.
> > > > 
> > > > This explicitly disables the YUV channel for the layer when
> > > > using
> > > > the
> > > > frontend as well. It also sets the relevant interlace bit, which
> > > > was
> > > > missing in the frontend path as well.
> > > 
> > > This should be part of a separate patch. Usually, if you write "it
> > > also does..." at the end of your commit log, it's a pretty good
> > > indication that it should be another patch :)
> > 
> > I must say, I figured that this part was missing in the frontend
> > path by
> > chance and couldn't really test the feature, so I'm also tempted to
> > drop
> > it altogether. What do you think?
> 
> If you haven't been able to test it, then yeah, don't submit it.

Alright, noted.

> > Also, is interlacing actually used on any of the video outputs we
> > support? Perhaps RGB?
>
> Composite would be a better guess :)

Oh and I was wondering what CVBS was about. Now I know!
It seems that we don't support it for now apparently, anyway.

Thanks,

-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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