linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: x1e80100: Make the PCIe 6a PHY support 4 lanes mode

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Date: Fri, 31 May 2024 22:55:28 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Rajendra Nayak <quic_rjendra@...cinc.com>, Sibi Sankar <quic_sibis@...cinc.com>, 
	Johan Hovold <johan@...nel.org>, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: x1e80100: Make the PCIe 6a PHY
 support 4 lanes mode

On Fri, May 31, 2024 at 08:00:32PM +0300, Abel Vesa wrote:
> So the PCIe 6 can be configured in 4-lane mode or 2-lane mode. For
> 4-lane mode, it fetches the lanes provided by PCIe 6b. For 2-lane mode,
> PCIe 6a uses 2 lanes and then PCIe 6b uses the other 2 lanes. Configure
> it in 4-lane mode and then each board can configure it depending on the
> design. Both the QCP and CRD boards, currently upstream, use the 6a for
> NVMe in 4-lane mode. Also, mark the controller as 4-lane as well.
> 
> Fixes: 5eb83fc10289 ("arm64: dts: qcom: x1e80100: Add PCIe nodes")
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> index fe7ca2a73f9d..17e4c5cda22d 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
> @@ -2838,7 +2838,7 @@ pcie6a: pci@...8000 {
>  			dma-coherent;
>  
>  			linux,pci-domain = <7>;
> -			num-lanes = <2>;
> +			num-lanes = <4>;
>  
>  			interrupts = <GIC_SPI 773 IRQ_TYPE_LEVEL_HIGH>,
>  				     <GIC_SPI 774 IRQ_TYPE_LEVEL_HIGH>,
> @@ -2903,19 +2903,21 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>  		};
>  
>  		pcie6a_phy: phy@...c000 {
> -			compatible = "qcom,x1e80100-qmp-gen4x2-pcie-phy";
> -			reg = <0 0x01bfc000 0 0x2000>;
> +			compatible = "qcom,x1e80100-qmp-gen4x4-pcie-phy";
> +			reg = <0 0x01bfc000 0 0x2000>,
> +			      <0 0x01bfe000 0 0x2000>;
>  
>  			clocks = <&gcc GCC_PCIE_6A_PHY_AUX_CLK>,
>  				 <&gcc GCC_PCIE_6A_CFG_AHB_CLK>,
>  				 <&rpmhcc RPMH_CXO_CLK>,
>  				 <&gcc GCC_PCIE_6A_PHY_RCHNG_CLK>,
> -				 <&gcc GCC_PCIE_6A_PIPE_CLK>;
> +				 <&gcc GCC_PCIE_6A_PIPEDIV2_CLK>;
>  			clock-names = "aux",
>  				      "cfg_ahb",
>  				      "ref",
>  				      "rchng",
> -				      "pipe";
> +				      "pipe",
> +				      "pipediv2";

I see 5 clocks and 6 clock-names here.

>  
>  			resets = <&gcc GCC_PCIE_6A_PHY_BCR>,
>  				 <&gcc GCC_PCIE_6A_NOCSR_COM_PHY_BCR>;
> @@ -2927,6 +2929,8 @@ pcie6a_phy: phy@...c000 {
>  
>  			power-domains = <&gcc GCC_PCIE_6_PHY_GDSC>;
>  
> +			qcom,4ln-config-sel = <&tcsr 0x1a000 0>;
> +
>  			#clock-cells = <0>;
>  			clock-output-names = "pcie6a_pipe_clk";
>  
> 
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry