linux-kernel - Re: [PATCH v4 3/9] PCI: imx6: Fetch dbi2 and iATU base addesses from DT

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Message-ID: <ZxgDWeaAVuz2ALxo@lizhi-Precision-Tower-5810>
Date: Tue, 22 Oct 2024 15:56:09 -0400
From: Frank Li <Frank.li@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Richard Zhu <hongxing.zhu@....com>, kw@...ux.com, bhelgaas@...gle.com,
	lpieralisi@...nel.org, l.stach@...gutronix.de, robh+dt@...nel.org,
	conor+dt@...nel.org, shawnguo@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, festevam@...il.com,
	s.hauer@...gutronix.de, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, kernel@...gutronix.de,
	imx@...ts.linux.dev
Subject: Re: [PATCH v4 3/9] PCI: imx6: Fetch dbi2 and iATU base addesses from
 DT

On Tue, Oct 22, 2024 at 10:18:01PM +0530, Manivannan Sadhasivam wrote:
> On Tue, Oct 15, 2024 at 04:33:27PM +0800, Richard Zhu wrote:
> > Since dbi2 and atu regs are added for i.MX8M PCIes. Fetch the dbi2 and iATU
> > base addresses from DT directly, and remove the useless codes.
> >
>
> Again, what will happen to old dts that don't define these regions?

Upsteam dts's have not enabled EP function. So not function broken for old
upsteam's dtb.

Frank

>
> - Mani
>
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 20 --------------------
> >  1 file changed, 20 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 52a8b2dc828a..2ae6fa4b5d32 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -1113,7 +1113,6 @@ static int imx_add_pcie_ep(struct imx_pcie *imx_pcie,
> >  			   struct platform_device *pdev)
> >  {
> >  	int ret;
> > -	unsigned int pcie_dbi2_offset;
> >  	struct dw_pcie_ep *ep;
> >  	struct dw_pcie *pci = imx_pcie->pci;
> >  	struct dw_pcie_rp *pp = &pci->pp;
> > @@ -1123,25 +1122,6 @@ static int imx_add_pcie_ep(struct imx_pcie *imx_pcie,
> >  	ep = &pci->ep;
> >  	ep->ops = &pcie_ep_ops;
> >
> > -	switch (imx_pcie->drvdata->variant) {
> > -	case IMX8MQ_EP:
> > -	case IMX8MM_EP:
> > -	case IMX8MP_EP:
> > -		pcie_dbi2_offset = SZ_1M;
> > -		break;
> > -	default:
> > -		pcie_dbi2_offset = SZ_4K;
> > -		break;
> > -	}
> > -
> > -	pci->dbi_base2 = pci->dbi_base + pcie_dbi2_offset;
> > -
> > -	/*
> > -	 * FIXME: Ideally, dbi2 base address should come from DT. But since only IMX95 is defining
> > -	 * "dbi2" in DT, "dbi_base2" is set to NULL here for that platform alone so that the DWC
> > -	 * core code can fetch that from DT. But once all platform DTs were fixed, this and the
> > -	 * above "dbi_base2" setting should be removed.
> > -	 */
> >  	if (device_property_match_string(dev, "reg-names", "dbi2") >= 0)
> >  		pci->dbi_base2 = NULL;
> >
> > --
> > 2.37.1
> >
>
> --
> மணிவண்ணன் சதாசிவம்