linux-kernel - Re: [PATCH v2 11/18] drm/sun4i: Add A83T support

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Message-ID: <20171128220014.w35rcliusubfdvoe@flea.home>
Date:   Tue, 28 Nov 2017 23:00:14 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Jernej Škrabec <jernej.skrabec@...l.net>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        plaes@...es.org, icenowy@...c.io,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH v2 11/18] drm/sun4i: Add A83T support



On Tue, Nov 28, 2017 at 04:48:55PM +0100, Jernej Škrabec wrote:
> > On Mon, Nov 27, 2017 at 05:01:49PM +0100, Jernej Škrabec wrote:
> > > Dne ponedeljek, 27. november 2017 ob 16:41:35 CET je Maxime Ripard 
> napisal(a):
> > > > Add support for the A83T display pipeline.
> > > > 
> > > > Reviewed-by: Chen-Yu Tsai <wens@...e.org>
> > > > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > > > ---
> > > > 
> > > >  Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt | 3 +++
> > > >  drivers/gpu/drm/sun4i/sun4i_drv.c                             | 2 ++
> > > >  drivers/gpu/drm/sun4i/sun4i_tcon.c                            | 5 +++++
> > > >  drivers/gpu/drm/sun4i/sun8i_mixer.c                           | 4 ++++
> > > >  4 files changed, 14 insertions(+)
> > > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> > > > b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt index
> > > > d4259a4f5171..d6b52e5c48c0 100644
> > > > --- a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> > > > +++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
> > > > 
> > > > @@ -93,6 +93,7 @@ Required properties:
> > > >     * allwinner,sun6i-a31s-tcon
> > > >     * allwinner,sun7i-a20-tcon
> > > >     * allwinner,sun8i-a33-tcon
> > > > 
> > > > +   * allwinner,sun8i-a83t-tcon-lcd
> > > > 
> > > >     * allwinner,sun8i-v3s-tcon
> > > >   
> > > >   - reg: base address and size of memory-mapped region
> > > >   - interrupts: interrupt associated to this IP
> > > > 
> > > > @@ -224,6 +225,7 @@ supported.
> > > > 
> > > >  Required properties:
> > > >    - compatible: value must be one of:
> > > > +    * allwinner,sun8i-a83t-de2-mixer
> > > 
> > > What will be the name of the second mixer, once support for HDMI is added?
> > > Should we start directly with 0 and 1 postfix ?
> > 
> > What are the differences exactly without the two mixers?
> 
> Mixer properties:
> - mixer index (0 or 1), important for determining CCSC base (see my patches)

Is that the only thing we need to determine?

> - number of VI planes (usually 1)

Usually or always?

> - number of UI planes (usually 1 or 3)

Same question.

> - writeback support (yes/no)
> - scale line buffer length (2048 or 4096)
> - smart backligth support (yes/no)
> 
> channel properties (for both, VI and UI):
> - scaler support (yes/no, usually yes)
> - overlay count (seems to be always 4)
> - VEP support (yes/no)
> 
> Those are properties found in BSP de_feat.c, so I guess that's enough to make 
> any kind of decision in the code.
> 
> Usually, but we can't count on that, first mixer has 1 VI and 3 UI planes and 
> second mixer has 1 VI and 1 UI plane.

Right. So that would be easy to support using a property as well. The
only difference would be the CSC base.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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