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Message-ID: <dc11577e-7088-4975-8543-ad8001e678fe@linaro.org>
Date: Sat, 30 Dec 2023 13:22:10 +0100
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Subject: Re: [PATCH v2 7/8] arm64: dts: qcom: sa8295p-adp: Enable GPU
To: Bjorn Andersson <quic_bjorande@quicinc.com>
Cc: Bjorn Andersson <andersson@kernel.org>,
 Michael Turquette <mturquette@baylibre.com>, Stephen Boyd
 <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Taniya Das <quic_tdas@quicinc.com>,
 Ulf Hansson <ulf.hansson@linaro.org>, Johan Hovold
 <johan+linaro@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>,
 Will Deacon <will@kernel.org>, linux-arm-msm@vger.kernel.org,
 linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org
References: <20231220-sa8295p-gpu-v2-0-4763246b72c0@quicinc.com>
 <20231220-sa8295p-gpu-v2-7-4763246b72c0@quicinc.com>
 <4a1c18e3-39c8-4070-ae55-b1148b3dc65b@linaro.org>
 <20231227202130.GA1315173@hu-bjorande-lv.qualcomm.com>
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From: Konrad Dybcio <konrad.dybcio@linaro.org>
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In-Reply-To: <20231227202130.GA1315173@hu-bjorande-lv.qualcomm.com>
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On 27.12.2023 21:21, Bjorn Andersson wrote:
> On Wed, Dec 27, 2023 at 02:09:47AM +0100, Konrad Dybcio wrote:
>> On 22.12.2023 05:39, Bjorn Andersson wrote:
>>> With the necessary support in place for supplying VDD_GFX from the
>>> MAX20411 regulator, enable the GPU clock controller, GMU, Adreno SMMU
>>> and the GPU on the SA8295P ADP.
>>>
>>> Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
>>> ---
>> [...]
>>
>>> +&gpucc {
>>> +	vdd-gfx-supply = <&vdd_gfx>;
>>> +	status = "okay";
>>> +};
>> Already enabled
>>
> 
> No, we're disabling these in sa8540p.dtsi, so they need to be re-enabled
> here.
> 
> I don't remember if it's because the attempt to bring up gfx.lvl or if
> it's the attempt to operate the GPU components without adequate VDD_GFX,
> that is causing the issue...but either way, we don't survive boot.
Oh right!

On 8155 touching mmcx, lcx or lmx would kaboom the platform..

> 
> 
> It's possible that we could move the max20411 up to sa8540p.dtsi to
> avoid the intermediate disable, but I'm not confident that it's "part of
> the platform"...
Yeah, it's probably a question that is impossible to answer, as my
wild assumption is that all designs are ADP-derived anyway..

Konrad