linux-kernel - Re: [PATCH v4 4/4] PCI: imx6: Add i.MX8Q PCIe Endpoint (EP) support

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Message-ID: <20241025223236.GA1030308@bhelgaas>
Date: Fri, 25 Oct 2024 17:32:36 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Abraham I <kishon@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...s.com, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev,
	Krzysztof Wilczyński <kwilczynski@...nel.org>
Subject: Re: [PATCH v4 4/4] PCI: imx6: Add i.MX8Q PCIe Endpoint (EP) support

On Thu, Oct 24, 2024 at 04:41:46PM -0400, Frank Li wrote:
> Add support for i.MX8Q series (i.MX8QM, i.MX8QXP, and i.MX8DXL) PCIe
> Endpoint (EP). On i.MX8Q platforms, the PCI bus addresses differ from the
> CPU addresses. The DesignWare (DWC) driver already handles this in the
> common code.
> 
> Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Chagne from v3 to v4
> - none
> change from v2 to v3
> - add Mani's review tag
> - Add pci->using_dtbus_info = true;
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index bdc2b372e6c13..5be9bac6206a7 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -70,6 +70,7 @@ enum imx_pcie_variants {
>  	IMX8MQ_EP,
>  	IMX8MM_EP,
>  	IMX8MP_EP,
> +	IMX8Q_EP,
>  	IMX95_EP,
>  };
>  
> @@ -1079,6 +1080,16 @@ static const struct pci_epc_features imx8m_pcie_epc_features = {
>  	.align = SZ_64K,
>  };
>  
> +static const struct pci_epc_features imx8q_pcie_epc_features = {
> +	.linkup_notifier = false,
> +	.msi_capable = true,
> +	.msix_capable = false,
> +	.bar[BAR_1] = { .type = BAR_RESERVED, },
> +	.bar[BAR_3] = { .type = BAR_RESERVED, },
> +	.bar[BAR_5] = { .type = BAR_RESERVED, },
> +	.align = SZ_64K,
> +};
> +
>  /*
>   * BAR#	| Default BAR enable	| Default BAR Type	| Default BAR Size	| BAR Sizing Scheme
>   * ================================================================================================
> @@ -1448,6 +1459,8 @@ static int imx_pcie_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> +	pci->using_dtbus_info = true;

I mentioned this elsewhere, but I think the using_dtbus_info part
should be part of a series that only deals with the address
translation, and adding IMX8Q_EP should be in a separate series.

>  	if (imx_pcie->drvdata->mode == DW_PCIE_EP_TYPE) {
>  		ret = imx_add_pcie_ep(imx_pcie, pdev);
>  		if (ret < 0)
> @@ -1645,6 +1658,14 @@ static const struct imx_pcie_drvdata drvdata[] = {
>  		.epc_features = &imx8m_pcie_epc_features,
>  		.enable_ref_clk = imx8mm_pcie_enable_ref_clk,
>  	},
> +	[IMX8Q_EP] = {
> +		.variant = IMX8Q_EP,
> +		.flags = IMX_PCIE_FLAG_HAS_PHYDRV,
> +		.mode = DW_PCIE_EP_TYPE,
> +		.epc_features = &imx8q_pcie_epc_features,
> +		.clk_names = imx8q_clks,
> +		.clks_cnt = ARRAY_SIZE(imx8q_clks),
> +	},
>  	[IMX95_EP] = {
>  		.variant = IMX95_EP,
>  		.flags = IMX_PCIE_FLAG_HAS_SERDES |
> @@ -1674,6 +1695,7 @@ static const struct of_device_id imx_pcie_of_match[] = {
>  	{ .compatible = "fsl,imx8mq-pcie-ep", .data = &drvdata[IMX8MQ_EP], },
>  	{ .compatible = "fsl,imx8mm-pcie-ep", .data = &drvdata[IMX8MM_EP], },
>  	{ .compatible = "fsl,imx8mp-pcie-ep", .data = &drvdata[IMX8MP_EP], },
> +	{ .compatible = "fsl,imx8q-pcie-ep", .data = &drvdata[IMX8Q_EP], },
>  	{ .compatible = "fsl,imx95-pcie-ep", .data = &drvdata[IMX95_EP], },
>  	{},
>  };
> 
> -- 
> 2.34.1
>