linux-kernel - Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Specify zap region for gpu

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Date: Wed, 3 Apr 2024 11:31:46 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Caleb Connolly <caleb.connolly@...aro.org>, Komal Bajaj <quic_kbajaj@...cinc.com>, 
	Naina Mehta <quic_nainmeht@...cinc.com>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: qcs6490-rb3gen2: Specify zap region for gpu

On Wed, 3 Apr 2024 at 06:33, Bjorn Andersson <quic_bjorande@...cinc.com> wrote:
>
> Without the zap region defined the enabled GPU will, if able to find the
> other firmware files, attempt to initialize itself without the zap
> firmware loading, which causes the rb3gen2 to freeze or crash.
>
> Add the zap-shader node and define the memory-region and firmware path
> to avoid this problem.
>
> Fixes: 04cf333afc75 ("arm64: dts: qcom: Add base qcs6490-rb3gen2 board dts")
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> index 63ebe0774f1d..5b81b5e0b4ce 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> @@ -471,6 +471,13 @@ &gcc {
>                            <GCC_WPSS_RSCP_CLK>;
>  };
>
> +&gpu {

Hmm, Is the GPU enabled by default? It should probably be fixed. I
think we usually do not enable the GPU by default on SoC.dtsi.

But now I understand, why it is marked with Fixes:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> +       zap-shader {
> +               memory-region = <&gpu_microcode_mem>;
> +               firmware-name = "qcom/qcs6490/a660_zap.mbn";
> +       };
> +};
> +
>  &qupv3_id_0 {
>         status = "okay";
>  };
>
> ---
> base-commit: 727900b675b749c40ba1f6669c7ae5eb7eb8e837
> change-id: 20240326-rb3gen2-gpu-4343c5dc7e40
>
> Best regards,
> --
> Bjorn Andersson <quic_bjorande@...cinc.com>
>
>


-- 
With best wishes
Dmitry