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

Dne torek, 28. november 2017 ob 10:02:23 CET je Maxime Ripard napisal(a):
> Hi,
>
> 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@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)
- number of VI planes (usually 1)
- number of UI planes (usually 1 or 3)
- 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.

Best regards,
Jernej

>
> I was hoping to be able to cover them all using properties, indices
> are usually pretty badly received in compatibles.
>
> > > static const struct of_device_id sun8i_mixer_of_table[] = {
> > >
> > > {
> > >
> > > + .compatible = "allwinner,sun8i-a83t-de2-mixer",
> > > + .data = &sun8i_v3s_mixer_cfg,
> > > + },
> > > + {
> >
> > Maybe you want to squash 12 patch since this works only by luck.
>
> Yeah, I totally meant to do that :)
>
> Thanks!
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com


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