linux-kernel - Re: [PATCH RFC 2/2] arm64: dts: qcom: msm8953: Add GPU

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Date: Fri, 26 Jan 2024 00:50:43 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
 phone-devel@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Vladimir Lypak <vladimir.lypak@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] arm64: dts: qcom: msm8953: Add GPU



On 1/25/24 22:56, Luca Weiss wrote:
> From: Vladimir Lypak <vladimir.lypak@...il.com>
> 
> Add the GPU node for the Adreno 506 found on this family of SoCs. The
> clock speeds are a bit different per SoC variant, SDM450 maxes out at
> 600MHz while MSM8953 (= SDM625) goes up to 650MHz and SDM632 goes up to
> 725MHz.
> 
> To achieve this, create a new sdm450.dtsi to hold the 600MHz OPP and
> use the new dtsi for sdm450-motorola-ali.
> 
> Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
> Co-developed-by: Luca Weiss <luca@...tu.xyz>
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>   arch/arm64/boot/dts/qcom/msm8953.dtsi            | 115 +++++++++++++++++++++++
>   arch/arm64/boot/dts/qcom/sdm450-motorola-ali.dts |   2 +-
>   arch/arm64/boot/dts/qcom/sdm450.dtsi             |  14 +++
>   arch/arm64/boot/dts/qcom/sdm632.dtsi             |   8 ++
>   4 files changed, 138 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8953.dtsi b/arch/arm64/boot/dts/qcom/msm8953.dtsi
> index 91d083871ab0..1fe0c0c4fd15 100644
> --- a/arch/arm64/boot/dts/qcom/msm8953.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8953.dtsi
> @@ -1046,6 +1046,94 @@ mdss_dsi1_phy: phy@...6400 {
>   			};
>   		};
>   
> +		gpu: gpu@...0000 {
> +			compatible = "qcom,adreno-506.0", "qcom,adreno";
> +			reg = <0x01c00000 0x40000>;
> +			reg-names = "kgsl_3d0_reg_memory";
> +			interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
> +
> +			clocks = <&gcc GCC_OXILI_GFX3D_CLK>,
> +				 <&gcc GCC_OXILI_AHB_CLK>,
> +				 <&gcc GCC_BIMC_GFX_CLK>,
> +				 <&gcc GCC_BIMC_GPU_CLK>,
> +				 <&gcc GCC_OXILI_TIMER_CLK>,
> +				 <&gcc GCC_OXILI_AON_CLK>;
> +			clock-names = "core",
> +				      "iface",
> +				      "mem_iface",
> +				      "alt_mem_iface",
> +				      "rbbmtimer",
> +				      "alwayson";
> +			power-domains = <&gcc OXILI_GX_GDSC>;
> +
> +			iommus = <&gpu_iommu 0>;
> +			operating-points-v2 = <&gpu_opp_table>;
> +
> +			#cooling-cells = <2>;
> +
> +			status = "disabled";
> +
> +			zap-shader {
> +				memory-region = <&zap_shader_region>;
> +			};
> +
> +			gpu_opp_table: opp-table {
> +				compatible = "operating-points-v2";
> +
> +				opp-19200000 {
> +					opp-hz = /bits/ 64 <19200000>;
> +					opp-supported-hw = <0xff>;
> +					required-opps = <&rpmpd_opp_min_svs>;
> +				};

If you remove all OPPs but this one, can the GPU still spit out pixels?

Konrad