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

From: "Clément Péron" <peron.clem@gmail.com>
To: Samuel Holland <samuel@sholland.org>
Cc: Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	 Rob Herring <robh+dt@kernel.org>,
	 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	devicetree <devicetree@vger.kernel.org>,
	 linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-sunxi@lists.linux.dev,
	 linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 4/4] arm64: dts: allwinner: beelink-gs1: Enable GPU OPP
Date: Sun, 4 Sep 2022 16:23:53 +0200	[thread overview]
Message-ID: <CAJiuCcdGS-H+tq0o47Zm=UJNEL+Ff0_mkUU1N86ttE=iOTbknw@mail.gmail.com> (raw)
In-Reply-To: <26ebdc2d-caca-2d53-45bc-8c8b90c7c1fd@sholland.org>

Hi Samuel,

On Sun, 4 Sept 2022 at 05:32, Samuel Holland <samuel@sholland.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@gmail.com> wrote:
> >>
> >> Hi Samuel,
> >>
> >> On Tue, 23 Aug 2022 at 05:07, Samuel Holland <samuel@sholland.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@gmail.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?

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

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