linux-kernel - Re: [PATCH v2 4/4] arm64: dts: allwinner: beelink-gs1: Enable GPU OPP

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Date:   Sun, 4 Sep 2022 16:29:07 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] arm64: dts: allwinner: beelink-gs1: Enable GPU OPP

Hi Samuel,

On Sun, 4 Sept 2022 at 16:23, Clément Péron <peron.clem@...il.com> wrote:
>
> Hi Samuel,
>
> On Sun, 4 Sept 2022 at 05:32, Samuel Holland <samuel@...lland.org> wrote:
> >
> > On 9/3/22 2:06 PM, Clément Péron wrote:
> > > Hi Samuel,
> > >
> > > On Sat, 3 Sept 2022 at 20:41, Clément Péron <peron.clem@...il.com> wrote:
> > >>
> > >> Hi Samuel,
> > >>
> > >> On Tue, 23 Aug 2022 at 05:07, Samuel Holland <samuel@...lland.org> wrote:
> > >>>
> > >>> On 8/21/22 12:30 PM, Clément Péron wrote:
> > >>>> Enable GPU OPP table for Beelink GS1
> > >>>>
> > >>>> Signed-off-by: Clément Péron <peron.clem@...il.com>
> > >>>> ---
> > >>>>  arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts | 2 ++
> > >>>>  1 file changed, 2 insertions(+)
> > >>>>
> > >>>> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
> > >>>> index 6249e9e02928..20fc0584d1c6 100644
> > >>>> --- a/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
> > >>>> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-beelink-gs1.dts
> > >>>> @@ -5,6 +5,7 @@
> > >>>>
> > >>>>  #include "sun50i-h6.dtsi"
> > >>>>  #include "sun50i-h6-cpu-opp.dtsi"
> > >>>> +#include "sun50i-h6-gpu-opp.dtsi"
> > >>>>
> > >>>>  #include <dt-bindings/gpio/gpio.h>
> > >>>>
> > >>>> @@ -261,6 +262,7 @@ reg_dcdca: dcdca {
> > >>>>                       };
> > >>>>
> > >>>>                       reg_dcdcc: dcdcc {
> > >>>> +                             regulator-always-on;
> > >>>
> > >>> Why is this necessary? This file already has:
> > >>
> > >> This is a relica from the first serie at this time the OPP doesn't
> > >> properly enable the regulator it's now fixed since:
> > >> https://patchwork.kernel.org/project/linux-pm/patch/81eb2efeeed1556d124065252f32777838a6d850.1589528491.git.viresh.kumar@linaro.org/
> >
> > This should have nothing to do with the OPP driver; lima already has a "mali"
> > regulator consumer that should be enabled whenever the GPU is in use.
>
> Okay so you propose to add a regulator_enable() in the panfrost
> drivers in addition to the OPP consumer right?

After a quick look it seems that it's explicit that we don't want two
consumer for the same regulator and OPP should handle the enabling of
the regulator.

/* OPP will handle regulators */
if (!pfdev->pfdevfreq.opp_of_table_added) {
err = panfrost_regulator_init(pfdev);
if (err)
goto out_devfreq;
}


>
> I will send a patch to add this and see what's panfrost maintainer
> think about it.
>
> Regards,
> Clement
>
> >
> > _Adding_ a regulator consumer from the OPP driver should not somehow decrease
> > the refcount.
> >
> > >> I will drop it.
> > >
> > > After retesting it, it seems to still no take the regulator and make
> > > my board hang... :(
> > >
> > > [   17.698597] sun8i-dw-hdmi 6000000.hdmi: registered DesignWare HDMI
> > > I2C bus driver
> > > [   17.708475] sun4i-drm display-engine: bound 6000000.hdmi (ops
> > > sun8i_dw_hdmi_ops [sun8i_drm_hdmi])
> > > [   17.718350] [drm] Initialized sun4i-drm 1.0.0 20150629 for
> > > display-engine on minor 1
> > > [   17.877443] Console: switching to colour frame buffer device 320x90
> > > [   17.936050] sun4i-drm display-engine: [drm] fb0: sun4i-drmdrmfb
> > > frame buffer device
> > > [   17.961881] platform 5200000.usb: deferred probe pending
> > >>>>> [   31.710731] vdd-gpu: disabling <<<<<
> >
> > Are there any messages from lima, especially about mali-supply? Can you provide
> > regulators_summary from debugfs?
> >
> > Regards,
> > Samuel