linux-kernel - Re: [PATCH] arm64: dts: qcom: x1e80100: Add GFX power domain to GPU clock controller

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Message-ID: <2dae7d88-4b3e-452f-9555-05f10b42dabc@oss.qualcomm.com>
Date: Wed, 23 Apr 2025 15:02:47 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Abel Vesa <abel.vesa@...aro.org>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan+linaro@...nel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: x1e80100: Add GFX power domain to GPU
 clock controller

On 4/23/25 2:58 PM, Abel Vesa wrote:
> According to documentation, the VDD_GFX is powering up the whole GPU
> subsystem. The VDD_GFX is routed through the RPMh GFX power domain.
> 
> So tie the RPMh GFX power domain to the GPU clock controller.
> 
> Cc: stable@...r.kernel.org # 6.11
> Fixes: 721e38301b79 ("arm64: dts: qcom: x1e80100: Add gpu support")
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---

You shouldn't be messing with VDD_GFX on platforms with a GMU.

Parts of the clock controller are backed by one of the MX rails,
with some logic depending on CX/GFX, but handling of the latter is
fully deferred to the GMU firmware.

Konrad