linux-kernel - Re: [PATCH v3 4/5] PCI: qcom-ep: Add HDMA support for SA8775P SoC

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Date: Mon, 26 Feb 2024 11:32:38 -0500
From: Frank Li <Frank.li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Jingoo Han <jingoohan1@...il.com>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Marek Vasut <marek.vasut+renesas@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Serge Semin <fancer.lancer@...il.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, mhi@...ts.linux.dev,
	Mrinmay Sarkar <quic_msarkar@...cinc.com>,
	Siddharth Vadapalli <s-vadapalli@...com>
Subject: Re: [PATCH v3 4/5] PCI: qcom-ep: Add HDMA support for SA8775P SoC

On Mon, Feb 26, 2024 at 05:07:29PM +0530, Manivannan Sadhasivam wrote:
> From: Mrinmay Sarkar <quic_msarkar@...cinc.com>
> 
> SA8775P SoC supports the new Hyper DMA (HDMA) DMA Engine inside the DWC IP.
> Let's add support for it by passing the mapping format and the number of
> read/write channels count.
> 
> The PCIe EP controller used on this SoC is of version 1.34.0, so a separate
> config struct is introduced for the sake of enabling HDMA conditionally.
> 
> It should be noted that for the eDMA support (predecessor of HDMA), there
> are no mapping format and channels count specified. That is because eDMA
> supports auto detection of both parameters, whereas HDMA doesn't.
> 
> Signed-off-by: Mrinmay Sarkar <quic_msarkar@...cinc.com>
> [mani: Reworded commit message, added kdoc, and minor cleanups]
> Reviewed-by: Siddharth Vadapalli <s-vadapalli@...com>

Reviewed-by: Frank Li <Frank.Li@....com>

> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/pci/controller/dwc/pcie-qcom-ep.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> index 45008e054e31..89d06a3e6e06 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> @@ -149,6 +149,14 @@ enum qcom_pcie_ep_link_status {
>  	QCOM_PCIE_EP_LINK_DOWN,
>  };
>  
> +/**
> + * struct qcom_pcie_ep_cfg - Per SoC config struct
> + * @hdma_support: HDMA support on this SoC
> + */
> +struct qcom_pcie_ep_cfg {
> +	bool hdma_support;
> +};
> +
>  /**
>   * struct qcom_pcie_ep - Qualcomm PCIe Endpoint Controller
>   * @pci: Designware PCIe controller struct
> @@ -803,6 +811,7 @@ static const struct dw_pcie_ep_ops pci_ep_ops = {
>  
>  static int qcom_pcie_ep_probe(struct platform_device *pdev)
>  {
> +	const struct qcom_pcie_ep_cfg *cfg;
>  	struct device *dev = &pdev->dev;
>  	struct qcom_pcie_ep *pcie_ep;
>  	char *name;
> @@ -816,6 +825,14 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev)
>  	pcie_ep->pci.ops = &pci_ops;
>  	pcie_ep->pci.ep.ops = &pci_ep_ops;
>  	pcie_ep->pci.edma.nr_irqs = 1;
> +
> +	cfg = of_device_get_match_data(dev);
> +	if (cfg && cfg->hdma_support) {
> +		pcie_ep->pci.edma.ll_wr_cnt = 8;
> +		pcie_ep->pci.edma.ll_rd_cnt = 8;
> +		pcie_ep->pci.edma.mf = EDMA_MF_HDMA_NATIVE;
> +	}
> +
>  	platform_set_drvdata(pdev, pcie_ep);
>  
>  	ret = qcom_pcie_ep_get_resources(pdev, pcie_ep);
> @@ -874,8 +891,12 @@ static void qcom_pcie_ep_remove(struct platform_device *pdev)
>  	qcom_pcie_disable_resources(pcie_ep);
>  }
>  
> +static const struct qcom_pcie_ep_cfg cfg_1_34_0 = {
> +	.hdma_support = true,
> +};
> +
>  static const struct of_device_id qcom_pcie_ep_match[] = {
> -	{ .compatible = "qcom,sa8775p-pcie-ep", },
> +	{ .compatible = "qcom,sa8775p-pcie-ep", .data = &cfg_1_34_0},
>  	{ .compatible = "qcom,sdx55-pcie-ep", },
>  	{ .compatible = "qcom,sm8450-pcie-ep", },
>  	{ }
> 
> -- 
> 2.25.1
>