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Message-ID: <Z9MHHU2Im7Eo0ETS@lizhi-Precision-Tower-5810> Date: Thu, 13 Mar 2025 12:26:05 -0400 From: Frank Li <Frank.li@....com> To: Bjorn Helgaas <helgaas@...nel.org> Cc: Lucas Stach <l.stach@...gutronix.de>, Hongxing Zhu <hongxing.zhu@....com>, "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>, "shawnguo@...nel.org" <shawnguo@...nel.org>, "lpieralisi@...nel.org" <lpieralisi@...nel.org>, "kw@...ux.com" <kw@...ux.com>, "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>, "bhelgaas@...gle.com" <bhelgaas@...gle.com>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>, "kernel@...gutronix.de" <kernel@...gutronix.de>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v1 2/2] PCI: imx6: Use domain number replace the hardcodes On Thu, Mar 13, 2025 at 11:06:48AM -0500, Bjorn Helgaas wrote: > On Thu, Mar 13, 2025 at 09:54:25AM +0100, Lucas Stach wrote: > > Am Mittwoch, dem 12.03.2025 um 10:22 -0400 schrieb Frank Li: > > > On Wed, Mar 12, 2025 at 09:28:02AM +0100, Lucas Stach wrote: > > > > Am Mittwoch, dem 12.03.2025 um 04:05 +0000 schrieb Hongxing Zhu: > > > > > > -----Original Message----- > > > > > > From: Bjorn Helgaas <helgaas@...nel.org> > > > > > > Sent: 2025年3月11日 23:55 > > > > > > To: Hongxing Zhu <hongxing.zhu@....com> > > > > > > Cc: robh@...nel.org; krzk+dt@...nel.org; conor+dt@...nel.org; > > > > > > shawnguo@...nel.org; l.stach@...gutronix.de; lpieralisi@...nel.org; > > > > > > kw@...ux.com; manivannan.sadhasivam@...aro.org; bhelgaas@...gle.com; > > > > > > s.hauer@...gutronix.de; festevam@...il.com; devicetree@...r.kernel.org; > > > > > > linux-pci@...r.kernel.org; imx@...ts.linux.dev; kernel@...gutronix.de; > > > > > > linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org > > > > > > Subject: Re: [PATCH v1 2/2] PCI: imx6: Use domain number replace the > > > > > > hardcodes > > > > > > > > > > > > On Tue, Mar 11, 2025 at 01:11:04AM +0000, Hongxing Zhu wrote: > > > > > > > > -----Original Message----- > > > > > > > > From: Bjorn Helgaas <helgaas@...nel.org> > > > > > > > > Sent: 2025年3月10日 23:11 > > > > > > > > To: Hongxing Zhu <hongxing.zhu@....com> > > > > > > > > Cc: robh@...nel.org; krzk+dt@...nel.org; conor+dt@...nel.org; > > > > > > > > shawnguo@...nel.org; l.stach@...gutronix.de; lpieralisi@...nel.org; > > > > > > > > kw@...ux.com; manivannan.sadhasivam@...aro.org; > > > > > > bhelgaas@...gle.com; > > > > > > > > s.hauer@...gutronix.de; festevam@...il.com; > > > > > > > > devicetree@...r.kernel.org; linux-pci@...r.kernel.org; > > > > > > > > imx@...ts.linux.dev; kernel@...gutronix.de; > > > > > > > > linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org > > > > > > > > Subject: Re: [PATCH v1 2/2] PCI: imx6: Use domain number replace the > > > > > > > > hardcodes > > > > > > > > > > > > > > > > On Wed, Feb 26, 2025 at 10:42:56AM +0800, Richard Zhu wrote: > > > > > > > > > Use the domain number replace the hardcodes to uniquely identify > > > > > > > > > different controller on i.MX8MQ platforms. No function changes. > > > > > > > > > > > > > > > > > > Signed-off-by: Richard Zhu <hongxing.zhu@....com> > > > > > > > > > --- > > > > > > > > > drivers/pci/controller/dwc/pci-imx6.c | 14 ++++++-------- > > > > > > > > > 1 file changed, 6 insertions(+), 8 deletions(-) > > > > > > > > > > > > > > > > > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c > > > > > > > > > b/drivers/pci/controller/dwc/pci-imx6.c > > > > > > > > > index 90ace941090f..ab9ebb783593 100644 > > > > > > > > > --- a/drivers/pci/controller/dwc/pci-imx6.c > > > > > > > > > +++ b/drivers/pci/controller/dwc/pci-imx6.c > > > > > > > > > @@ -41,7 +41,6 @@ > > > > > > > > > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11) > > > > > > > > > #define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12) > > > > > > > > > #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, > > > > > > 8) > > > > > > > > > -#define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000 > > > > > > > > > > > > > > > > > > #define IMX95_PCIE_PHY_GEN_CTRL 0x0 > > > > > > > > > #define IMX95_PCIE_REF_USE_PAD BIT(17) > > > > > > > > > @@ -1474,7 +1473,6 @@ static int imx_pcie_probe(struct > > > > > > > > > platform_device > > > > > > > > *pdev) > > > > > > > > > struct dw_pcie *pci; > > > > > > > > > struct imx_pcie *imx_pcie; > > > > > > > > > struct device_node *np; > > > > > > > > > - struct resource *dbi_base; > > > > > > > > > struct device_node *node = dev->of_node; > > > > > > > > > int i, ret, req_cnt; > > > > > > > > > u16 val; > > > > > > > > > @@ -1515,10 +1513,6 @@ static int imx_pcie_probe(struct > > > > > > > > platform_device *pdev) > > > > > > > > > return PTR_ERR(imx_pcie->phy_base); > > > > > > > > > } > > > > > > > > > > > > > > > > > > - pci->dbi_base = devm_platform_get_and_ioremap_resource(pdev, > > > > > > 0, > > > > > > > > &dbi_base); > > > > > > > > > - if (IS_ERR(pci->dbi_base)) > > > > > > > > > - return PTR_ERR(pci->dbi_base); > > > > > > > > > > > > > > > > This makes me wonder. > > > > > > > > > > > > > > > > IIUC this means that previously we set controller_id to > > > > > > > > 1 if the first item in devicetree "reg" was 0x33c00000, > > > > > > > > and now we will set controller_id to 1 if the devicetree > > > > > > > > "linux,pci-domain" property is 1. This is good, but I > > > > > > > > think this new dependency on the correct > > > > > > > > "linux,pci-domain" in devicetree should be mentioned in > > > > > > > > the commit log. > > > > > > > > > > > > > > > > My bigger worry is that we no longer set pci->dbi_base > > > > > > > > at all. I see that the only use of pci->dbi_base in > > > > > > > > pci-imx6.c was to determine the controller_id, but this > > > > > > > > is a DWC-based driver, and the DWC core certainly uses > > > > > > > > pci->dbi_base. Are we sure that none of those DWC core > > > > > > > > paths are important to pci-imx6.c? > > > > > > > > > > > > > > Thanks for your concerns. Don't worry about the > > > > > > > assignment of pci->dbi_base. If pci-imx6.c driver doesn't > > > > > > > set it. DWC core driver would set it when > > > > > > > dw_pcie_get_resources() is invoked. > > > > > > > > > > > > Great, thanks! Maybe we can amend the commit log to mention > > > > > > that and the new "linux,pci-domain" dependency. > > > > > > > > > > How about the following updates of the commit log? > > > > > > > > > > Use the domain number replace the hardcodes to uniquely > > > > > identify different controller on i.MX8MQ platforms. No > > > > > function changes. Please make sure the " linux,pci-domain" is > > > > > set for i.MX8MQ correctly, since the controller id is relied > > > > > on it totally. > > > > > > > > > This breaks running a new kernel on an old DT without the > > > > linux,pci-domain property, which I'm absolutely no fan of. We > > > > tried really hard to keep this way around working in the i.MX > > > > world. > > > > > > 8MQ already add linux,pci-domain since Jan, 2021 > > > > > > commit c0b70f05c87f3b09b391027c6f056d0facf331ef > > > Author: Peng Fan <peng.fan@....com> > > > Date: Fri Jan 15 11:26:57 2021 +0800 > > > > > > Only missed is pcie-ep side, which have not been used at all boards dts > > > file in upstream. > > > > I wasn't aware of this. 2021 is quite a while ago, so I suspect that > > nobody is going to run a new kernel with a DT this old. I retract my > > objection. > > Sounds good, thanks, Lucas. We really do want to avoid breaking old > DTs, so I appreciate your highlighting of it. Even if we believe none > of them will break, I think it's worth mentioning the > 'linux,pci-domain' dependency and the commit that added it to the > .dtsi in the commit log. Yes, I think you can add it? some thing like "linux,pci-domain" must match the PCIe controller instance sequence for the i.MX8MQ platform. Frank > > Bjorn
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