linux-kernel - Re: [PATCH v12 09/13] PCI: dwc: ep: Consolidate devicetree handling in dw_pcie_ep_get

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Message-ID: <Z9Yo4PeBH49EXPkg@lizhi-Precision-Tower-5810>
Date: Sat, 15 Mar 2025 21:26:56 -0400
From: Frank Li <Frank.li@....com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Niklas Cassel <cassel@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v12 09/13] PCI: dwc: ep: Consolidate devicetree handling
 in dw_pcie_ep_get_resources()

On Sat, Mar 15, 2025 at 03:15:44PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Consolidate devicetree resource handling in dw_pcie_ep_get_resources().
> No functional change intended.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---

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

>  .../pci/controller/dwc/pcie-designware-ep.c   | 68 +++++++++++--------
>  1 file changed, 41 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 100d26466f05..2db834345ec2 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -883,35 +883,15 @@ void dw_pcie_ep_linkdown(struct dw_pcie_ep *ep)
>  }
>  EXPORT_SYMBOL_GPL(dw_pcie_ep_linkdown);
>
> -/**
> - * dw_pcie_ep_init - Initialize the endpoint device
> - * @ep: DWC EP device
> - *
> - * Initialize the endpoint device. Allocate resources and create the EPC
> - * device with the endpoint framework.
> - *
> - * Return: 0 if success, errno otherwise.
> - */
> -int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> +static int dw_pcie_ep_get_resources(struct dw_pcie_ep *ep)
>  {
> -	int ret;
> -	struct resource *res;
> -	struct pci_epc *epc;
>  	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
>  	struct device *dev = pci->dev;
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct device_node *np = dev->of_node;
> -
> -	INIT_LIST_HEAD(&ep->func_list);
> -
> -	epc = devm_pci_epc_create(dev, &epc_ops);
> -	if (IS_ERR(epc)) {
> -		dev_err(dev, "Failed to create epc device\n");
> -		return PTR_ERR(epc);
> -	}
> -
> -	ep->epc = epc;
> -	epc_set_drvdata(epc, ep);
> +	struct pci_epc *epc = ep->epc;
> +	struct resource *res;
> +	int ret;
>
>  	ret = dw_pcie_get_resources(pci);
>  	if (ret)
> @@ -924,13 +904,47 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>  	ep->phys_base = res->start;
>  	ep->addr_size = resource_size(res);
>
> -	if (ep->ops->pre_init)
> -		ep->ops->pre_init(ep);
> -
>  	ret = of_property_read_u8(np, "max-functions", &epc->max_functions);
>  	if (ret < 0)
>  		epc->max_functions = 1;
>
> +	return 0;
> +}
> +
> +/**
> + * dw_pcie_ep_init - Initialize the endpoint device
> + * @ep: DWC EP device
> + *
> + * Initialize the endpoint device. Allocate resources and create the EPC
> + * device with the endpoint framework.
> + *
> + * Return: 0 if success, errno otherwise.
> + */
> +int dw_pcie_ep_init(struct dw_pcie_ep *ep)
> +{
> +	int ret;
> +	struct pci_epc *epc;
> +	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
> +	struct device *dev = pci->dev;
> +
> +	INIT_LIST_HEAD(&ep->func_list);
> +
> +	epc = devm_pci_epc_create(dev, &epc_ops);
> +	if (IS_ERR(epc)) {
> +		dev_err(dev, "Failed to create epc device\n");
> +		return PTR_ERR(epc);
> +	}
> +
> +	ep->epc = epc;
> +	epc_set_drvdata(epc, ep);
> +
> +	ret = dw_pcie_ep_get_resources(ep);
> +	if (ret)
> +		return ret;
> +
> +	if (ep->ops->pre_init)
> +		ep->ops->pre_init(ep);
> +
>  	ret = pci_epc_mem_init(epc, ep->phys_base, ep->addr_size,
>  			       ep->page_size);
>  	if (ret < 0) {
> --
> 2.34.1
>