linux-kernel - Re: [PATCH v2 4/8] arm64: dts: allwinner: Add ARM Mali GPU node for H6

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Date:   Thu, 11 Apr 2019 11:24:54 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Jernej Škrabec <jernej.skrabec@...l.net>,
        Clément Péron <peron.clem@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jagan Teki <jagan@...rulasolutions.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v2 4/8] arm64: dts: allwinner: Add ARM Mali GPU node for H6

On Thu, Apr 11, 2019 at 10:27 AM Maxime Ripard
<maxime.ripard@...tlin.com> wrote:
>
> On Thu, Apr 11, 2019 at 05:23:25PM +0200, Jernej Škrabec wrote:
> > Dne četrtek, 11. april 2019 ob 17:20:04 CEST je Clément Péron napisal(a):
> > > Hi,
> > >
> > > On Thu, 11 Apr 2019 at 17:05, Jernej Škrabec <jernej.skrabec@...l.net>
> > wrote:
> > > > Dne četrtek, 11. april 2019 ob 12:57:16 CEST je Clément Péron napisal(a):
> > > > > Add the mali gpu node to the H6 device-tree.
> > > > >
> > > > > Signed-off-by: Clément Péron <peron.clem@...il.com>
> > > > > ---
> > > > >
> > > > >  arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 14 ++++++++++++++
> > > > >  1 file changed, 14 insertions(+)
> > > > >
> > > > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > > b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi index
> > > > > e0dc4a05c1ba..196753110434 100644
> > > > > --- a/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > > +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi
> > > > > @@ -157,6 +157,20 @@
> > > > >
> > > > >                       allwinner,sram = <&ve_sram 1>;
> > > > >
> > > > >               };
> > > > >
> > > > > +             gpu: gpu@...0000 {
> > > > > +                     compatible = "allwinner,sun50i-h6-mali",
> > > > > +                                  "arm,mali-t720";
> > > > > +                     reg = <0x01800000 0x4000>;
> > > > > +                     interrupts = <GIC_SPI 84
> > > >
> > > > IRQ_TYPE_LEVEL_HIGH>,
> > > >
> > > > > +                                  <GIC_SPI 85
> > > >
> > > > IRQ_TYPE_LEVEL_HIGH>,
> > > >
> > > > > +                                  <GIC_SPI 83
> > > >
> > > > IRQ_TYPE_LEVEL_HIGH>;
> > > >
> > > > > +                     interrupt-names = "job", "mmu", "gpu";
> > > > > +                     clocks = <&ccu CLK_GPU>, <&ccu CLK_BUS_GPU>;
> > > > > +                     clock-names = "core", "bus";
> > > > > +                     resets = <&ccu RST_BUS_GPU>;
> > > > > +                     status = "disabled";
> > > >
> > > > Usually self sufficient peripherals are enabled by default in DTSI.
> > >
> > > I follow the other Mali Midgard (rk3399, rk3288) syntax.
> > > But I think you're right here, will go for an update I think.
> >
> > I quickly checked A64 and H5 DTSI and both have GPU enabled by default (status
> > property is not set).
>
> I asked myself the same question, but the H6 seems to have a supply
> wired to the GPU, while the H3 and H5 do not. So I'm not sure we want
> to enable it on all the boards, even though some might have left out
> the GPU supply which will result in a non-working GPU (I assume?)

If the default state is enabled, then only devfreq will be disabled
for panfrost, but it should otherwise work. I guess we could be
smarter and just do frequency changes if all the OPP voltages are the
same.

Rob