linux-kernel - Re: [PATCH v5 04/10] PCI: imx6: Correct controller

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Message-ID: <ZyOtl8zCmxSBSOxd@lizhi-Precision-Tower-5810>
Date: Thu, 31 Oct 2024 12:17:27 -0400
From: Frank Li <Frank.li@....com>
To: Richard Zhu <hongxing.zhu@....com>
Cc: l.stach@...gutronix.de, bhelgaas@...gle.com, lpieralisi@...nel.org,
	kw@...ux.com, manivannan.sadhasivam@...aro.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, shawnguo@...nel.org,
	s.hauer@...gutronix.de, festevam@...il.com, imx@...ts.linux.dev,
	kernel@...gutronix.de, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 04/10] PCI: imx6: Correct controller_id generation
 logic for i.MX7D

On Thu, Oct 31, 2024 at 04:06:49PM +0800, Richard Zhu wrote:
> i.MX7D only has one PCIe controller, so controller_id should always be 0.
> The previous code is incorrect although yielding the correct result. Fix by
> removing IMX7D from the switch case branch.
>
> Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> ---

You can simple mention previous discussion here.

Converience for reviewer, and past previous discission here.

"This is just *wrong*. You cannot hardcode the MMIO address in the driver. Even
though this code is old, you should fix it instead of building on top of it.

- Mani"

IMX7D here is wrong athough check IMX8MQ_PCIE2_BASE_ADDR is not good
method. Previously try to use 'linux,pci-domain' to replace this check
logic. Need more discussion to improve it and keep old compatiblity. Let's
fix this code error firstly.

Frank

>  drivers/pci/controller/dwc/pci-imx6.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index d21f7d2e79dc..7479d3253f20 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1344,7 +1344,6 @@ static int imx_pcie_probe(struct platform_device *pdev)
>  	switch (imx_pcie->drvdata->variant) {
>  	case IMX8MQ:
>  	case IMX8MQ_EP:
> -	case IMX7D:
>  		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
>  			imx_pcie->controller_id = 1;
>  		break;
> --
> 2.37.1
>