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Date:   Sun, 28 May 2023 22:37:17 +0530
From:   Manivannan Sadhasivam <mani@kernel.org>
To:     Konrad Dybcio <konrad.dybcio@linaro.org>
Cc:     Bjorn Andersson <quic_bjorande@quicinc.com>,
        Bjorn Andersson <andersson@kernel.org>,
        Rob Clark <robdclark@gmail.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Sean Paul <sean@poorly.run>,
        Akhil P Oommen <quic_akhilpo@quicinc.com>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        freedreno@lists.freedesktop.org, johan@kernel.org, mani@kernel.org
Subject: Re: [PATCH v2 2/3] arm64: dts: qcom: sc8280xp: Add GPU related nodes
Message-ID: <20230528170717.GG2814@thinkpad>
References: <20230523011522.65351-1-quic_bjorande@quicinc.com>
 <20230523011522.65351-3-quic_bjorande@quicinc.com>
 <097944b0-fa7a-ad4d-1c3d-e74ab2b977de@linaro.org>
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On Tue, May 23, 2023 at 09:59:53AM +0200, Konrad Dybcio wrote:
> 
> 
> On 23.05.2023 03:15, Bjorn Andersson wrote:
> > From: Bjorn Andersson <bjorn.andersson@linaro.org>
> > 
> > Add Adreno SMMU, GPU clock controller, GMU and GPU nodes for the
> > SC8280XP.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
> > ---
> It does not look like you tested the DTS against bindings. Please run
> `make dtbs_check` (see
> Documentation/devicetree/bindings/writing-schema.rst for instructions).
> 
> > 
> > Changes since v1:
> > - Dropped gmu_pdc_seq region from &gmu, as it shouldn't have been used.
> > - Added missing compatible to &adreno_smmu.
> > - Dropped aoss_qmp clock in &gmu and &adreno_smmu.
> >  
> >  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 169 +++++++++++++++++++++++++
> >  1 file changed, 169 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > index d2a2224d138a..329ec2119ecf 100644
> > --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> > @@ -6,6 +6,7 @@
> >  
> >  #include <dt-bindings/clock/qcom,dispcc-sc8280xp.h>
> >  #include <dt-bindings/clock/qcom,gcc-sc8280xp.h>
> > +#include <dt-bindings/clock/qcom,gpucc-sc8280xp.h>
> >  #include <dt-bindings/clock/qcom,rpmh.h>
> >  #include <dt-bindings/interconnect/qcom,osm-l3.h>
> >  #include <dt-bindings/interconnect/qcom,sc8280xp.h>
> > @@ -2331,6 +2332,174 @@ tcsr: syscon@1fc0000 {
> >  			reg = <0x0 0x01fc0000 0x0 0x30000>;
> >  		};
> >  
> > +		gpu: gpu@3d00000 {
> > +			compatible = "qcom,adreno-690.0", "qcom,adreno";
> > +
> > +			reg = <0 0x03d00000 0 0x40000>,
> > +			      <0 0x03d9e000 0 0x1000>,
> > +			      <0 0x03d61000 0 0x800>;
> > +			reg-names = "kgsl_3d0_reg_memory",
> > +				    "cx_mem",
> > +				    "cx_dbgc";
> > +			interrupts = <GIC_SPI 300 IRQ_TYPE_LEVEL_HIGH>;
> > +			iommus = <&adreno_smmu 0 0xc00>, <&adreno_smmu 1 0xc00>;
> > +			operating-points-v2 = <&gpu_opp_table>;
> > +
> > +			qcom,gmu = <&gmu>;
> > +			interconnects = <&gem_noc MASTER_GFX3D 0 &mc_virt SLAVE_EBI1 0>;
> > +			interconnect-names = "gfx-mem";
> > +			#cooling-cells = <2>;
> > +
> > +			status = "disabled";
> > +
> > +			gpu_opp_table: opp-table {
> > +				compatible = "operating-points-v2";
> > +
> > +				opp-270000000 {
> > +					opp-hz = /bits/ 64 <270000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_LOW_SVS>;
> > +					opp-peak-kBps = <451000>;
> > +				};
> > +
> > +				opp-410000000 {
> > +					opp-hz = /bits/ 64 <410000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_SVS>;
> > +					opp-peak-kBps = <1555000>;
> > +				};
> > +
> > +				opp-500000000 {
> > +					opp-hz = /bits/ 64 <500000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_SVS_L1>;
> > +					opp-peak-kBps = <1555000>;
> > +				};
> > +
> > +				opp-547000000 {
> > +					opp-hz = /bits/ 64 <547000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_SVS_L2>;
> > +					opp-peak-kBps = <1555000>;
> > +				};
> > +
> > +				opp-606000000 {
> > +					opp-hz = /bits/ 64 <606000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_NOM>;
> > +					opp-peak-kBps = <2736000>;
> > +				};
> > +
> > +				opp-640000000 {
> > +					opp-hz = /bits/ 64 <640000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_NOM_L1>;
> > +					opp-peak-kBps = <2736000>;
> > +				};
> > +
> > +				opp-690000000 {
> > +					opp-hz = /bits/ 64 <690000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_TURBO>;
> > +					opp-peak-kBps = <2736000>;
> > +				};
> > +			};
> > +		};
> > +
> > +		gmu: gmu@3d6a000 {
> > +			compatible = "qcom,adreno-gmu-690.0", "qcom,adreno-gmu";
> > +			reg = <0 0x03d6a000 0 0x34000>,
> > +			      <0 0x03de0000 0 0x10000>,
> > +			      <0 0x0b290000 0 0x10000>;
> > +			reg-names = "gmu", "rscc", "gmu_pdc";
> > +			interrupts = <GIC_SPI 304 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 305 IRQ_TYPE_LEVEL_HIGH>;
> > +			interrupt-names = "hfi", "gmu";
> > +			clocks = <&gpucc GPU_CC_CX_GMU_CLK>,
> > +				 <&gpucc GPU_CC_CXO_CLK>,
> > +				 <&gcc GCC_DDRSS_GPU_AXI_CLK>,
> > +				 <&gcc GCC_GPU_MEMNOC_GFX_CLK>,
> > +				 <&gpucc GPU_CC_AHB_CLK>,
> > +				 <&gpucc GPU_CC_HUB_CX_INT_CLK>,
> > +				 <&gpucc GPU_CC_HLOS1_VOTE_GPU_SMMU_CLK>;
> > +			clock-names = "gmu",
> > +				      "cxo",
> > +				      "axi",
> > +				      "memnoc",
> > +				      "ahb",
> > +				      "hub",
> > +				      "smmu_vote";
> > +			power-domains = <&gpucc GPU_CC_CX_GDSC>,
> > +					<&gpucc GPU_CC_GX_GDSC>;
> > +			power-domain-names = "cx",
> > +					     "gx";
> > +			iommus = <&adreno_smmu 5 0xc00>;
> > +			operating-points-v2 = <&gmu_opp_table>;
> > +
> > +			status = "disabled";
> I've recently discovered that - and I am not 100% sure - all GMUs are
> cache-coherent. Could you please ask somebody at qc about this?
> 

AFAIU, GMU's job is controlling the voltage and clock to the GPU. It doesn't do
any data transactions on its own. So cache-coherent doesn't make sense to me.

- Mani

> > +
> > +			gmu_opp_table: opp-table {
> > +				compatible = "operating-points-v2";
> > +
> > +				opp-200000000 {
> > +					opp-hz = /bits/ 64 <200000000>;
> > +					opp-level = <RPMH_REGULATOR_LEVEL_MIN_SVS>;
> > +				};
> Missing 500MHz + RPMH_REGULATOR_LEVEL_SVS
> 
> (that may be used in the future for hw scheduling)
> > +			};
> > +		};
> > +
> > +		gpucc: clock-controller@3d90000 {
> > +			compatible = "qcom,sc8280xp-gpucc";
> > +			reg = <0 0x03d90000 0 0x9000>;
> > +			clocks = <&rpmhcc RPMH_CXO_CLK>,
> > +				 <&gcc GCC_GPU_GPLL0_CLK_SRC>,
> > +				 <&gcc GCC_GPU_GPLL0_DIV_CLK_SRC>;
> > +			clock-names = "bi_tcxo",
> > +				      "gcc_gpu_gpll0_clk_src",
> > +				      "gcc_gpu_gpll0_div_clk_src";
> FWIW the driver doesn't use clock-names, but the binding defines it,
> so I suppose it's fine
> 
> > +
> > +			power-domains = <&rpmhpd SC8280XP_GFX>;
> > +			#clock-cells = <1>;
> > +			#reset-cells = <1>;
> > +			#power-domain-cells = <1>;
> > +
> > +			status = "disabled";
> > +		};
> > +
> > +		adreno_smmu: iommu@3da0000 {
> > +			compatible = "qcom,sc8280xp-smmu-500", "qcom,adreno-smmu",
> > +				     "qcom,smmu-500", "arm,mmu-500";
> > +			reg = <0 0x03da0000 0 0x20000>;
> > +			#iommu-cells = <2>;
> > +			#global-interrupts = <2>;
> > +			interrupts = <GIC_SPI 672 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 673 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 678 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 679 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 680 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 681 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 682 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 683 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 684 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 685 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 686 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 687 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 688 IRQ_TYPE_LEVEL_HIGH>,
> > +				     <GIC_SPI 689 IRQ_TYPE_LEVEL_HIGH>;
> > +
> > +			clocks = <&gcc GCC_GPU_MEMNOC_GFX_CLK>,
> > +				 <&gcc GCC_GPU_SNOC_DVM_GFX_CLK>,
> > +				 <&gpucc GPU_CC_AHB_CLK>,
> > +				 <&gpucc GPU_CC_HLOS1_VOTE_GPU_SMMU_CLK>,
> > +				 <&gpucc GPU_CC_CX_GMU_CLK>,
> > +				 <&gpucc GPU_CC_HUB_CX_INT_CLK>,
> > +				 <&gpucc GPU_CC_HUB_AON_CLK>;
> > +			clock-names = "gcc_gpu_memnoc_gfx_clk",
> > +				      "gcc_gpu_snoc_dvm_gfx_clk",
> > +				      "gpu_cc_ahb_clk",
> > +				      "gpu_cc_hlos1_vote_gpu_smmu_clk",
> > +				      "gpu_cc_cx_gmu_clk",
> > +				      "gpu_cc_hub_cx_int_clk",
> > +				      "gpu_cc_hub_aon_clk";
> > +
> > +			power-domains = <&gpucc GPU_CC_CX_GDSC>;
> > +
> > +			status = "disabled";
> This one should be dma-coherent (per downstream, plus 8350's mmu is for sure)
> 
> Konrad
> > +		};
> > +
> >  		usb_0_hsphy: phy@88e5000 {
> >  			compatible = "qcom,sc8280xp-usb-hs-phy",
> >  				     "qcom,usb-snps-hs-5nm-phy";

-- 
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