Re: [PATCH v3 0/4] DT schema changes for HiKey970 PCIe hardware to work

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Em Wed, 11 Aug 2021 22:13:32 -0500
Rob Herring <robh@xxxxxxxxxx> escreveu:

> On Wed, Aug 11, 2021 at 1:46 AM Mauro Carvalho Chehab
> <mchehab+huawei@xxxxxxxxxx> wrote:
> >
> > Em Tue, 10 Aug 2021 11:13:48 -0600
> > Rob Herring <robh@xxxxxxxxxx> escreveu:
> >  
> > > > > >                                         compatible = "pciclass,0604";
> > > > > >                                         device_type = "pci";
> > > > > >                                         #address-cells = <3>;
> > > > > >                                         #size-cells = <2>;
> > > > > >                                         ranges;
> > > > > >                                 };
> > > > > >                                 pcie@1,0 { // Lane 4: M.2  
> > > > >
> > > > > These 3 nodes (1, 5, 7) need to be child nodes of the above node.  
> > >
> > > This was the main issue.  
> >
> > Ok, placing 1, 5, 7 as child nodes of 0 worked, with the attached
> > DT schema:
> >
> >
> >         $ ls -l $(find /sys/devices/platform/soc/f4000000.pcie/ -name of_node)
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/of_node -> ../../../../firmware/devicetree/base/soc/pcie@f4000000
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:01.0/of_node -> ../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@1,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:01.0/pci_bus/0000:03/of_node -> ../../../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@1,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:05.0/of_node -> ../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@5,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:05.0/pci_bus/0000:05/of_node -> ../../../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@5,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:07.0/of_node -> ../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@7,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:07.0/pci_bus/0000:06/of_node -> ../../../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@7,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/of_node -> ../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/pci_bus/0000:02/of_node -> ../../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/of_node -> ../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/0000:00:00.0/pci_bus/0000:01/of_node -> ../../../../../../../../firmware/devicetree/base/soc/pcie@f4000000/pcie@0,0
> >         lrwxrwxrwx 1 root root 0 ago 11 08:43 /sys/devices/platform/soc/f4000000.pcie/pci0000:00/pci_bus/0000:00/of_node -> ../../../../../../../firmware/devicetree/base/soc/pcie@f4000000  
> 
> This all looks right to me, but...
> 
> > The logs also seem OK on my eyes:
> >
> >         [    3.911082]  (null): pci_set_bus_of_node: of_node: /soc/pcie@f4000000
> >         [    4.001104] pci 0000:00:00.0: pci_set_of_node: of_node: /soc/pcie@f4000000
> >         [    4.043609] pci_bus 0000:01: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0
> >         [    4.076756] pci 0000:01:00.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0
> >         [    4.120652] pci_bus 0000:02: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         [    4.150766] pci 0000:02:01.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         [    4.196413] pci 0000:02:04.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         [    4.238896] pci 0000:02:05.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         [    4.280116] pci 0000:02:07.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
> >         [    4.309821] pci 0000:02:09.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0  
> 
> ...these do not.

For the above:

	s/of_node:/BUS of_node:/

The debug printk is misleading. It is actually printing the BUS of_node:

	void pci_set_of_node(struct pci_dev *dev)
	{
		dev_dbg(&dev->dev, "%s: of_node: %pOF\n",
			__func__, dev->bus->dev.of_node);

		if (!dev->bus->dev.of_node)
			return;
	...

If I move it to the right place, e. g.:

	void pci_set_of_node(struct pci_dev *dev)
	{
		if (!dev->bus->dev.of_node) {
			dev_dbg(&dev->dev, "%s: BUS of_node is null\n",
				__func__, dev->bus->dev.of_node);
			return;
		}
		dev->dev.of_node = of_pci_find_child_device(dev->bus->dev.of_node,
							    dev->devfn);
		if (dev->dev.of_node)
			dev->dev.fwnode = &dev->dev.of_node->fwnode;

		dev_dbg(&dev->dev, "%s: of_node: %pOF\n",
			__func__, dev->dev.of_node);
	}

It will produce:

	[    4.155771]  (null): pci_set_bus_of_node: of_node: /soc/pcie@f4000000
	[    4.208740] pci 0000:00:00.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0
	[    4.236759] pci_bus 0000:01: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0
	[    4.257899] pci 0000:01:00.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
	[    4.310350] pci_bus 0000:02: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0
	[    4.337784] pci 0000:02:01.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@1,0
	[    4.370998] pci 0000:02:04.0: pci_set_of_node: of_node: (null)
	[    4.391459] pci 0000:02:05.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@5,0
	[    4.415378] pci 0000:02:07.0: pci_set_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@7,0
	[    4.439420] pci 0000:02:09.0: pci_set_of_node: of_node: (null)
	[    4.494288] pci_bus 0000:03: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@1,0
	[    4.511394] pci_bus 0000:04: pci_set_bus_of_node: of_node: (null)
	[    4.525084] pci_bus 0000:05: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@5,0
	[    4.542173] pci_bus 0000:06: pci_set_bus_of_node: of_node: /soc/pcie@f4000000/pcie@0,0/pcie@0,0/pcie@7,0
	[    4.578575] pci 0000:06:00.0: pci_set_of_node: of_node: (null)
	[    4.612159] pci_bus 0000:07: pci_set_bus_of_node: of_node: (null)

Which reflects the PCIe topology.

Thanks,
Mauro



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