linux-kernel - Re: [PATCH v3 4/7] PCI: qcom: Add support for IPQ9574

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Message-ID: <20240417071406.GC3894@thinkpad>
Date: Wed, 17 Apr 2024 12:44:06 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Alexandru Gagniuc <mr.nuke.me@...il.com>
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 <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 4/7] PCI: qcom: Add support for IPQ9574

On Mon, Apr 15, 2024 at 01:20:49PM -0500, Alexandru Gagniuc wrote:
> Add support for the PCIe on IPQ9574. The main difference from ipq6018
> is that the "iface" clock is not necessarry. Add a special case in
> qcom_pcie_get_resources_2_9_0() to handle this.
> 

Could you add more information about the PCIe controller used in this SoC? Like
controller version, supported data rate, PCIe generation etc...

- Mani

> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 14772edcf0d3..10560d6d6336 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1101,15 +1101,19 @@ static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
>  	struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
>  	struct dw_pcie *pci = pcie->pci;
>  	struct device *dev = pci->dev;
> -	int ret;
> +	int ret, num_clks = ARRAY_SIZE(res->clks) - 1;
>  
> -	res->clks[0].id = "iface";
> +	res->clks[0].id = "rchng";
>  	res->clks[1].id = "axi_m";
>  	res->clks[2].id = "axi_s";
>  	res->clks[3].id = "axi_bridge";
> -	res->clks[4].id = "rchng";
>  
> -	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
> +	if (!of_device_is_compatible(dev->of_node, "qcom,pcie-ipq9574")) {
> +		res->clks[4].id = "iface";
> +		num_clks++;
> +	}
> +
> +	ret = devm_clk_bulk_get(dev, num_clks, res->clks);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -1664,6 +1668,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
>  	{ .compatible = "qcom,pcie-ipq8074", .data = &cfg_2_3_3 },
>  	{ .compatible = "qcom,pcie-ipq8074-gen3", .data = &cfg_2_9_0 },
> +	{ .compatible = "qcom,pcie-ipq9574", .data = &cfg_2_9_0 },
>  	{ .compatible = "qcom,pcie-msm8996", .data = &cfg_2_3_2 },
>  	{ .compatible = "qcom,pcie-qcs404", .data = &cfg_2_4_0 },
>  	{ .compatible = "qcom,pcie-sa8540p", .data = &cfg_sc8280xp },
> -- 
> 2.40.1
> 

-- 
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