linux-kernel - Re: [PATCH v8 5/7] arm64: dts: qcom: sm8450: Add opp table support to PCIe

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Message-ID: <86ce6b70-1c84-6e0d-528c-40fff7bf8326@quicinc.com>
Date: Tue, 5 Mar 2024 16:27:47 +0530
From: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To: Manivannan Sadhasivam <mani@...nel.org>
CC: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring
	<robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring
	<robh+dt@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Brian Masney
	<bmasney@...hat.com>, Georgi Djakov <djakov@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <vireshk@...nel.org>, <quic_vbadigan@...cinc.com>,
        <quic_skananth@...cinc.com>, <quic_nitegupt@...cinc.com>,
        <quic_parass@...cinc.com>
Subject: Re: [PATCH v8 5/7] arm64: dts: qcom: sm8450: Add opp table support to
 PCIe



On 3/4/2024 11:19 PM, Manivannan Sadhasivam wrote:
> On Sat, Mar 02, 2024 at 09:29:59AM +0530, Krishna chaitanya chundru wrote:
>> PCIe needs to choose the appropriate performance state of RPMH power
>> domain and interconnect bandwidth based up on the PCIe gen speed.
>>
>> Add the OPP table support to specify RPMH performance states and
>> interconnect peak bandwidth.
>>
>> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/sm8450.dtsi | 74 ++++++++++++++++++++++++++++++++++++
>>   1 file changed, 74 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> index 6b1d2e0d9d14..662f2129f20d 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>> @@ -1827,7 +1827,32 @@ pcie0: pcie@...0000 {
>>   			pinctrl-names = "default";
>>   			pinctrl-0 = <&pcie0_default_state>;
>>   
>> +			operating-points-v2 = <&pcie0_opp_table>;
>> +
>>   			status = "disabled";
>> +
>> +			pcie0_opp_table: opp-table {
>> +				compatible = "operating-points-v2";
>> +
>> +				opp-2500000 {
> 
> Add the comments that you added below.
ACK.
> 
>> +					opp-hz = /bits/ 64 <2500000>;
>> +					required-opps = <&rpmhpd_opp_low_svs>;
>> +					opp-peak-kBps = <250000 1>;
> 
> Isn't the peak bw should be greater that the avg bw? Atleast in upstream we
> follow that pattern.
> 
> - Mani
The two values which are defined are for peak BW only one value 
corresponds to PCI-MEM path and other to CPU to PCIe path.
- Krishna Chaitanya.
> 
>> +				};
>> +
>> +				opp-5000000 {
>> +					opp-hz = /bits/ 64 <5000000>;
>> +					required-opps = <&rpmhpd_opp_low_svs>;
>> +					opp-peak-kBps = <500000 1>;
>> +				};
>> +
>> +				opp-8000000 {
>> +					opp-hz = /bits/ 64 <8000000>;
>> +					required-opps = <&rpmhpd_opp_nom>;
>> +					opp-peak-kBps = <984500 1>;
>> +				};
>> +			};
>> +
>>   		};
>>   
>>   		pcie0_phy: phy@...6000 {
>> @@ -1938,7 +1963,56 @@ pcie1: pcie@...8000 {
>>   			pinctrl-names = "default";
>>   			pinctrl-0 = <&pcie1_default_state>;
>>   
>> +			operating-points-v2 = <&pcie1_opp_table>;
>> +
>>   			status = "disabled";
>> +
>> +			pcie1_opp_table: opp-table {
>> +				compatible = "operating-points-v2";
>> +
>> +				/* GEN 1x1 */
>> +				opp-2500000 {
>> +					opp-hz = /bits/ 64 <2500000>;
>> +					required-opps = <&rpmhpd_opp_low_svs>;
>> +					opp-peak-kBps = <250000 1>;
>> +				};
>> +
>> +				/* GEN 1x2 GEN 2x1 */
>> +				opp-5000000 {
>> +					opp-hz = /bits/ 64 <5000000>;
>> +					required-opps = <&rpmhpd_opp_low_svs>;
>> +					opp-peak-kBps = <500000 1>;
>> +				};
>> +
>> +				/* GEN 2x2 */
>> +				opp-10000000 {
>> +					opp-hz = /bits/ 64 <10000000>;
>> +					required-opps = <&rpmhpd_opp_low_svs>;
>> +					opp-peak-kBps = <1000000 1>;
>> +				};
>> +
>> +				/* GEN 3x1 */
>> +				opp-8000000 {
>> +					opp-hz = /bits/ 64 <8000000>;
>> +					required-opps = <&rpmhpd_opp_nom>;
>> +					opp-peak-kBps = <984500 1>;
>> +				};
>> +
>> +				/* GEN 3x2 GEN 4x1 */
>> +				opp-16000000 {
>> +					opp-hz = /bits/ 64 <16000000>;
>> +					required-opps = <&rpmhpd_opp_nom>;
>> +					opp-peak-kBps = <1969000 1>;
>> +				};
>> +
>> +				/* GEN 4x2 */
>> +				opp-32000000 {
>> +					opp-hz = /bits/ 64 <32000000>;
>> +					required-opps = <&rpmhpd_opp_nom>;
>> +					opp-peak-kBps = <3938000 1>;
>> +				};
>> +			};
>> +
>>   		};
>>   
>>   		pcie1_phy: phy@...e000 {
>>
>> -- 
>> 2.42.0
>>
>