[U-Boot] [linux-sunxi] Re: [RFC PATCH 0/3] sunxi: video: Add support for HDMI output on H3

[Maxime Ripard]

On Wed, Dec 14, 2016 at 11:02:33AM +0800, Chen-Yu Tsai wrote:
> On Wed, Dec 14, 2016 at 5:16 AM, Icenowy Zheng <icenowy at aosc.xyz> wrote:
> >
> >
> > 14.12.2016, 04:29, "Simon Glass" <sjg at chromium.org>:
> >> Hi,
> >>
> >> On 12 December 2016 at 19:36, Jernej Skrabec <jernej.skrabec at siol.net> wrote:
> >>>  This patch series add support for HDMI output. Support for other,
> >>>  newer, SoCs, which also uses DE2 and same or similar HDMI controller
> >>>  and PHY can be easily added later (A83T/A64/H5/R40). Current driver
> >>>  can also be easily extended with TV out support, just like video
> >>>  driver for older Allwinner SoCs.
> >>>
> >>>  While driver works, I would like to get few opinions first.
> >>>  - From what I understand, drivers which supports DT are preferred.
> >>>    Would it be better to rewrite this driver to support device tree?
> >>
> >> Yes I think so, and in fact it should use driver model also.
> >>
> >> The rockchip driver provides a reasonable example of how to split the
> >> driver up as you suggest below. The VIDEO driver provides the
> >> top-level video interface, DISPLAY drivers provide display output for
> >> the video, and you have PANEL as well for receiving the display
> >> output. VIDCONSOLE works automatically to display text.
> >>
> >> I actually took a bit of a look at this a few weeks ago so am happy to
> >> help with review or discussions.
> >
> > Yes, I think go to Driver Model is also valuable, as Allwinner's display parts
> > are really in reusable components.
> >
> > In addition, Driver Model provides the possibility to use EFI GOP, which can
> > be a more standardized replacement of SimpleFB, especially for OSes other
> > than Linux. (For example, Windows, if we can really get it running ;-) )
> 
> We're going to use EFI now? Doesn't EFI mean we have to leave another bit
> of firmware in memory running under the OS? What about PSCI and ATF on
> ARMv8?

Until EFI on A64 on U-boot is a real thing, I don't really care to be
honest.

Maxime

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