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Date: Thu, 25 Apr 2024 18:53:30 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Krishna chaitanya chundru <quic_krichai@quicinc.com>
Cc: Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
	Bjorn Helgaas <bhelgaas@google.com>, johan+linaro@kernel.org,
	bmasney@redhat.com, djakov@kernel.org,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	vireshk@kernel.org, quic_vbadigan@quicinc.com,
	quic_skananth@quicinc.com, quic_nitegupt@quicinc.com,
	quic_parass@quicinc.com, krzysztof.kozlowski@linaro.org
Subject: Re: [PATCH v11 4/6] arm64: dts: qcom: sm8450: Add OPP table support
 to PCIe
Message-ID: <20240425132330.GD3449@thinkpad>
References: <20240423-opp_support-v11-0-15fdd40b0f95@quicinc.com>
 <20240423-opp_support-v11-4-15fdd40b0f95@quicinc.com>
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In-Reply-To: <20240423-opp_support-v11-4-15fdd40b0f95@quicinc.com>

On Tue, Apr 23, 2024 at 02:36:58PM +0530, Krishna chaitanya chundru wrote:
> PCIe host controller driver needs to choose the appropriate performance
> state of RPMh power domain and interconnect bandwidth based on the PCIe
> data rate.
> 
> Hence, add the OPP table support to specify RPMh performance states and
> interconnect peak bandwidth.
> 
> It should be noted that the different link configurations may share the
> same aggregate bandwidth, e.g., a 2.5 GT/s x2 link and a 5.0 GT/s x1
> link have the same bandwidth and share the same OPP entry.
> 
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@quicinc.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

- Mani

> ---
>  arch/arm64/boot/dts/qcom/sm8450.dtsi | 77 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> index 615296e13c43..2e047aba220b 100644
> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> @@ -1855,7 +1855,35 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>  			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";
> +
> +				/* GEN 1 x1 */
> +				opp-2500000 {
> +					opp-hz = /bits/ 64 <2500000>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +					opp-peak-kBps = <250000 1>;
> +				};
> +
> +				/* GEN 2 x1 */
> +				opp-5000000 {
> +					opp-hz = /bits/ 64 <5000000>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +					opp-peak-kBps = <500000 1>;
> +				};
> +
> +				/* GEN 3 x1 */
> +				opp-8000000 {
> +					opp-hz = /bits/ 64 <8000000>;
> +					required-opps = <&rpmhpd_opp_nom>;
> +					opp-peak-kBps = <984500 1>;
> +				};
> +			};
> +
>  		};
>  
>  		pcie0_phy: phy@1c06000 {
> @@ -1982,7 +2010,56 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>  			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 1 x1 */
> +				opp-2500000 {
> +					opp-hz = /bits/ 64 <2500000>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +					opp-peak-kBps = <250000 1>;
> +				};
> +
> +				/* GEN 1 x2 and GEN 2 x1 */
> +				opp-5000000 {
> +					opp-hz = /bits/ 64 <5000000>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +					opp-peak-kBps = <500000 1>;
> +				};
> +
> +				/* GEN 2 x2 */
> +				opp-10000000 {
> +					opp-hz = /bits/ 64 <10000000>;
> +					required-opps = <&rpmhpd_opp_low_svs>;
> +					opp-peak-kBps = <1000000 1>;
> +				};
> +
> +				/* GEN 3 x1 */
> +				opp-8000000 {
> +					opp-hz = /bits/ 64 <8000000>;
> +					required-opps = <&rpmhpd_opp_nom>;
> +					opp-peak-kBps = <984500 1>;
> +				};
> +
> +				/* GEN 3 x2 and GEN 4 x1 */
> +				opp-16000000 {
> +					opp-hz = /bits/ 64 <16000000>;
> +					required-opps = <&rpmhpd_opp_nom>;
> +					opp-peak-kBps = <1969000 1>;
> +				};
> +
> +				/* GEN 4 x2 */
> +				opp-32000000 {
> +					opp-hz = /bits/ 64 <32000000>;
> +					required-opps = <&rpmhpd_opp_nom>;
> +					opp-peak-kBps = <3938000 1>;
> +				};
> +			};
> +
>  		};
>  
>  		pcie1_phy: phy@1c0e000 {
> 
> -- 
> 2.42.0
> 

-- 
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