linux-kernel - Re: [PATCH v5 3/4] arm64: dts: qcom: qcs615: enable pcie

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Message-ID: <4748f657-8017-4794-9fe4-313af68603d0@quicinc.com>
Date: Wed, 18 Jun 2025 14:30:04 +0800
From: Ziyue Zhang <quic_ziyuzhan@...cinc.com>
To: Manivannan Sadhasivam <mani@...nel.org>
CC: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>,
        <manivannan.sadhasivam@...aro.org>, <robh@...nel.org>,
        <bhelgaas@...gle.com>, <krzk+dt@...nel.org>,
        <neil.armstrong@...aro.org>, <abel.vesa@...aro.org>, <kw@...ux.com>,
        <conor+dt@...nel.org>, <vkoul@...nel.org>, <kishon@...nel.org>,
        <andersson@...nel.org>, <konradybcio@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_qianyu@...cinc.com>,
        <quic_krichai@...cinc.com>, <quic_vbadigan@...cinc.com>
Subject: Re: [PATCH v5 3/4] arm64: dts: qcom: qcs615: enable pcie


On 6/18/2025 12:29 AM, Manivannan Sadhasivam wrote:
> On Tue, May 27, 2025 at 03:20:35PM +0800, Ziyue Zhang wrote:
>> From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
>>
>> Add configurations in devicetree for PCIe0, including registers, clocks,
>> interrupts and phy setting sequence.
>>
>> Add PCIe lane equalization preset properties for 8 GT/s.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
>> Signed-off-by: Ziyue Zhang <quic_ziyuzhan@...cinc.com>
> Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
>
> One comment below.
>
>> ---
>>   arch/arm64/boot/dts/qcom/qcs615.dtsi | 146 +++++++++++++++++++++++++++
>>   1 file changed, 146 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/qcs615.dtsi b/arch/arm64/boot/dts/qcom/qcs615.dtsi
>> index bb8b6c3ebd03..0af757c45eb2 100644
>> --- a/arch/arm64/boot/dts/qcom/qcs615.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/qcs615.dtsi
>> @@ -1012,6 +1012,152 @@ mmss_noc: interconnect@...0000 {
>>   			qcom,bcm-voters = <&apps_bcm_voter>;
>>   		};
>>   
>> +		pcie: pcie@...8000 {
>> +			device_type = "pci";
>> +			compatible = "qcom,pcie-qcs615", "qcom,pcie-sm8150";
>> +			reg = <0x0 0x01c08000 0x0 0x3000>,
>> +			      <0x0 0x40000000 0x0 0xf1d>,
>> +			      <0x0 0x40000f20 0x0 0xa8>,
>> +			      <0x0 0x40001000 0x0 0x1000>,
>> +			      <0x0 0x40100000 0x0 0x100000>,
>> +			      <0x0 0x01c0b000 0x0 0x1000>;
>> +			reg-names = "parf",
>> +				    "dbi",
>> +				    "elbi",
>> +				    "atu",
>> +				    "config",
>> +				    "mhi";
>> +			#address-cells = <3>;
>> +			#size-cells = <2>;
>> +			ranges = <0x01000000 0x0 0x00000000 0x0 0x40200000 0x0 0x100000>,
>> +				 <0x02000000 0x0 0x40300000 0x0 0x40300000 0x0 0x1fd00000>;
>> +			bus-range = <0x00 0xff>;
>> +
>> +			dma-coherent;
>> +
>> +			linux,pci-domain = <0>;
>> +			num-lanes = <1>;
>> +
>> +			interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 143 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
>> +				     <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-names = "msi0",
>> +					  "msi1",
>> +					  "msi2",
>> +					  "msi3",
>> +					  "msi4",
>> +					  "msi5",
>> +					  "msi6",
>> +					  "msi7",
>> +					  "global";
>> +
>> +			#interrupt-cells = <1>;
>> +			interrupt-map-mask = <0 0 0 0x7>;
>> +			interrupt-map = <0 0 0 1 &intc GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>,
>> +					<0 0 0 2 &intc GIC_SPI 150 IRQ_TYPE_LEVEL_HIGH>,
>> +					<0 0 0 3 &intc GIC_SPI 151 IRQ_TYPE_LEVEL_HIGH>,
>> +					<0 0 0 4 &intc GIC_SPI 152 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> +			clocks = <&gcc GCC_PCIE_0_PIPE_CLK>,
>> +				 <&gcc GCC_PCIE_0_AUX_CLK>,
>> +				 <&gcc GCC_PCIE_0_CFG_AHB_CLK>,
>> +				 <&gcc GCC_PCIE_0_MSTR_AXI_CLK>,
>> +				 <&gcc GCC_PCIE_0_SLV_AXI_CLK>,
>> +				 <&gcc GCC_PCIE_0_SLV_Q2A_AXI_CLK>;
>> +			clock-names = "pipe",
>> +				      "aux",
>> +				      "cfg",
>> +				      "bus_master",
>> +				      "bus_slave",
>> +				      "slave_q2a";
>> +			assigned-clocks = <&gcc GCC_PCIE_0_AUX_CLK>;
>> +			assigned-clock-rates = <19200000>;
>> +
>> +			interconnects = <&aggre1_noc MASTER_PCIE QCOM_ICC_TAG_ALWAYS
>> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>> +					<&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
>> +					 &config_noc SLAVE_PCIE_0 QCOM_ICC_TAG_ACTIVE_ONLY>;
>> +			interconnect-names = "pcie-mem", "cpu-pcie";
>> +
>> +			iommu-map = <0x0 &apps_smmu 0x400 0x1>,
>> +				    <0x100 &apps_smmu 0x401 0x1>;
>> +
>> +			resets = <&gcc GCC_PCIE_0_BCR>;
>> +			reset-names = "pci";
>> +
>> +			power-domains = <&gcc PCIE_0_GDSC>;
>> +
>> +			phys = <&pcie_phy>;
>> +			phy-names = "pciephy";
>> +
>> +			eq-presets-8gts = /bits/ 16 <0x5555 0x5555 0x5555 0x5555
>> +						     0x5555 0x5555 0x5555 0x5555>;
> Do you really need to set the presets for this SoC? Just making sure that it is
> not randomly copied from other DTS without purpose.
>
> - Mani

Hi Mani,

We need the presets for improve stability, and I find there only needs one 0x5555
for qcs615 pcie only has 1 lane. I will fix this in the next post.

BRs
Ziyue