RE: [PATCH v4 4/9] PCI: imx6: Correct controller_id generation logic for i.MX7D

Hongxing Zhu
2024-10-24T07:43:06Z

> -----Original Message-----
> From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Sent: 2024年10月23日 0:56
> To: Hongxing Zhu <hongxing.zhu@nxp.com>
> Cc: kw@linux.com; bhelgaas@google.com; lpieralisi@kernel.org; Frank Li
> <frank.li@nxp.com>; l.stach@pengutronix.de; robh+dt@kernel.org;
> conor+dt@kernel.org; shawnguo@kernel.org;
> krzysztof.kozlowski+dt@linaro.org; festevam@gmail.com;
> s.hauer@pengutronix.de; linux-pci@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org;
> devicetree@vger.kernel.org; kernel@pengutronix.de; imx@lists.linux.dev
> Subject: Re: [PATCH v4 4/9] PCI: imx6: Correct controller_id generation logic
> for i.MX7D
>
> On Tue, Oct 15, 2024 at 04:33:28PM +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@nxp.com>
> > Reviewed-by: Frank Li <Frank.Li@nxp.com>
> > ---
> > 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 2ae6fa4b5d32..ca8714c625fe 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -1338,7 +1338,6 @@ 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)
>
> 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.
Hi Manivannan:
Thanks for your comments.
To avoid break DT compatibility, a proper method should be figured out to fix
the hardcode here.
But it should be another story, how about to add this to the TO-DO list, and
issue the patch later?

Best Regards
Richard Zhu
>
> - Mani
>
> --
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