linux-kernel - Re: [PATCH] arm64: dts: mt8183: Add node for the Mali GPU

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Message-ID: <CANMq1KD++==d0Mb6T2gKU1T7c_MaedswOYdxqEqEKKUL1bxgiw@mail.gmail.com>
Date:   Thu, 19 Sep 2019 06:16:48 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nick Fan <nick.fan@...iatek.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Douglas Anderson <dianders@...omium.org>,
        Dominik Behr <dbehr@...omium.org>
Subject: Re: [PATCH] arm64: dts: mt8183: Add node for the Mali GPU

Thanks Rob and Alyssa.

+Douglas Anderson +Dominik Behr who may be interested (if not already aware)

On Sat, Sep 14, 2019 at 2:17 AM Alyssa Rosenzweig
<alyssa.rosenzweig@...labora.com> wrote:
>
> > > > The binding we use with out-of-tree Mali drivers includes more
> > > > clocks, I assume this would be required eventually if we have an
> > > > in-tree driver:
> > >
> > > We have an in-tree driver...
> >
> > Right but AFAICT it does not support Bifrost GPU (yet?).
>
> By the time MT8183 shows up in more concrete devices, it will, certainly
> in kernel-space and likely in userspace as well. At present, the DDK can
> be modified to run on top of the in-tree Mali drivers, i.e. "Bifrost on
> mainline linux-next (+ page table/compatible patches), with blob
> userspace".
>
> While the open userspace isn't ready here quite yet, I would definitely
> encourage upstream kernel for ChromeOS, since then there's no need to
> maintain the out-of-tree GPU driver.

That's an interesting idea, I had no idea, thanks for the info!

Would that work with midgard as well? We have released hardware with
RK3288/3399, so it might be nice to experiment with these first.

>
> ---
>
> More immediately, per Rob's review, it's important that the bindings
> accepted upstream work with the in-tree Bifrost driver. Conceptually,
> once Mesa supports Bifrost, if I install Debian on a MT8183 board,
> everything should just work. I shouldn't need MT-specific changes / need
> to change names for the DT. Regardless of which kernel driver you end up
> using, minimally sharing the DT is good for everyone :-)

Yes. I'll try to dig further with MTK, but this may take some time.

>
> -Alyssa