[linux-sunxi] Re: [U-Boot] [PATCH v4 0/3] Allwinner DE2 HDMI SimpleFB support

[icenowy]

在 2017-09-15 21:35，Maxime Ripard 写道：

On Fri, Sep 15, 2017 at 02:25:12PM +0100, Peter Robinson wrote:
On Fri, Sep 15, 2017 at 2:59 AM, Icenowy Zheng  
wrote:

> This patchset is for Allwinner DE2 HDMI SimpleFB support.
>
> The framebuffer initialized by the Allwinner DE2 driver can be
> passed by to the kernel as simplefb, and this can enable the
> kernel to display graphics without having full DE2 driver.
>
> Add the suppot of simplefb in DE2 code.
>
> The code to find a simplefb with sunxi extension and a suitable
> pipeline is extracted to a new source file in video/sunxi/.
>
> An option is added for device tree simplefb, and furtherly
> other simplefb support code should also be converted to it.

There was a generic simplefb driver recently added [1], is it worth
basing it on that?

[1] https://lists.denx.de/pipermail/u-boot/2017-September/306273.html


This is a simplefb "client", it uses a display that has already been
initialized. What Icenowy is working on is a "provider", ie it
initializes the display in order for other components to reuse it
(Linux).


As I know, now FreeBSD and NetBSD are also going to use the simplefb.



Maxime


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[linux-sunxi] Re: [U-Boot] [PATCH v4 0/3] Allwinner DE2 HDMI SimpleFB support

[Maxime Ripard]

On Fri, Sep 15, 2017 at 02:25:12PM +0100, Peter Robinson wrote:
> On Fri, Sep 15, 2017 at 2:59 AM, Icenowy Zheng  wrote:
> > This patchset is for Allwinner DE2 HDMI SimpleFB support.
> >
> > The framebuffer initialized by the Allwinner DE2 driver can be
> > passed by to the kernel as simplefb, and this can enable the
> > kernel to display graphics without having full DE2 driver.
> >
> > Add the suppot of simplefb in DE2 code.
> >
> > The code to find a simplefb with sunxi extension and a suitable
> > pipeline is extracted to a new source file in video/sunxi/.
> >
> > An option is added for device tree simplefb, and furtherly
> > other simplefb support code should also be converted to it.
> 
> There was a generic simplefb driver recently added [1], is it worth
> basing it on that?
>
> [1] https://lists.denx.de/pipermail/u-boot/2017-September/306273.html

This is a simplefb "client", it uses a display that has already been
initialized. What Icenowy is working on is a "provider", ie it
initializes the display in order for other components to reuse it
(Linux).

Maxime

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

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[linux-sunxi] Re: [U-Boot] [PATCH v4 0/3] Allwinner DE2 HDMI SimpleFB support

[Peter Robinson]

On Fri, Sep 15, 2017 at 2:59 AM, Icenowy Zheng  wrote:
> This patchset is for Allwinner DE2 HDMI SimpleFB support.
>
> The framebuffer initialized by the Allwinner DE2 driver can be
> passed by to the kernel as simplefb, and this can enable the
> kernel to display graphics without having full DE2 driver.
>
> Add the suppot of simplefb in DE2 code.
>
> The code to find a simplefb with sunxi extension and a suitable
> pipeline is extracted to a new source file in video/sunxi/.
>
> An option is added for device tree simplefb, and furtherly
> other simplefb support code should also be converted to it.

There was a generic simplefb driver recently added [1], is it worth
basing it on that?

[1] https://lists.denx.de/pipermail/u-boot/2017-September/306273.html

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