[PATCH v2 11/18] drm/sun4i: Add A83T support

Maxime Ripard
2017-11-28T22:00:14Z

On Tue, Nov 28, 2017 at 04:48:55PM +0100, Jernej ?krabec wrote:
> > On Mon, Nov 27, 2017 at 05:01:49PM +0100, Jernej ?krabec 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@csie.org>
> > > > Signed-off-by: Maxime Ripard <maxime.ripard@free-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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