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

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Date:   Sat, 3 Sep 2022 22:32:36 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Clément Péron <peron.clem@...il.com>
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

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.

_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