linux-kernel - Re: [PATCH v2] arm64: dts: qcom: disable GPU on x1e80100 by default

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Message-ID: <20240715190108.vjctytyntxlottgt@hu-akhilpo-hyd.qualcomm.com>
Date: Tue, 16 Jul 2024 00:31:08 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
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>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: disable GPU on x1e80100 by default

On Mon, Jul 15, 2024 at 09:18:49PM +0300, Dmitry Baryshkov wrote:
> The GPU on X1E80100 requires ZAP 'shader' file to be useful. Since the
> file is signed by the OEM keys and might be not available by default,
> disable the GPU node and drop the firmware name from the x1e80100.dtsi
> file. Devices not being fused to use OEM keys can specify generic
> location at `qcom/x1e80100/gen70500_zap.mbn` while enabling the GPU.
> 
> The CRD was lucky enough to work with the default settings, so reenable
> the GPU on that platform and provide correct firmware-name (including
> the SoC subdir).
> 
> Fixes: 721e38301b79 ("arm64: dts: qcom: x1e80100: Add gpu support")
> Cc: Akhil P Oommen <quic_akhilpo@...cinc.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
> Changes in v2:
> - Keep GPU enabled for X1E80100-CRD (Johan)
> - Link to v1: https://lore.kernel.org/r/20240715-x1e8-zap-name-v1-1-b66df09d0b65@linaro.org
> ---
>  arch/arm64/boot/dts/qcom/x1e80100-crd.dts | 8 ++++++++
>  arch/arm64/boot/dts/qcom/x1e80100.dtsi    | 3 ++-
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> index 6152bcd0bc1f..8f4e238f014f 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e80100-crd.dts
> @@ -637,6 +637,14 @@ vreg_l3j_0p8: ldo3 {
>  	};
>  };
>  
> +&gpu {
> +	satus = "okay";

s/satus/status

Also, we should add this chunk to x1e80100-qcp.dts too.

> +
> +	zap-shader {
> +		firmware-name = "qcom/x1e80100/gen70500_zap.mbn";
> +	};
> +};
> +
>  &i2c0 {
>  	clock-frequency = <400000>;
>  
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> index 7bca5fcd7d52..8df90d01eba8 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> @@ -3155,9 +3155,10 @@ gpu: gpu@...0000 {
>  			interconnects = <&gem_noc MASTER_GFX3D 0 &mc_virt SLAVE_EBI1 0>;
>  			interconnect-names = "gfx-mem";
>  
> +			status = "disabled";
> +
>  			zap-shader {
>  				memory-region = <&gpu_microcode_mem>;
> -				firmware-name = "qcom/gen70500_zap.mbn";

In general, why not keep a default zap firmware listed here? Anyway we
are disabling gpu node here in case of platforms which doesn't upstream
secure firmwares.

-Akhil

>  			};
>  
>  			gpu_opp_table: opp-table {
> 
> ---
> base-commit: 3fe121b622825ff8cc995a1e6b026181c48188db
> change-id: 20240715-x1e8-zap-name-7b3c79234401
> 
> Best regards,
> -- 
> Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>