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7f4b4c29f3
openwrt/target/linux/mpc85xx/files/arch/powerpc/boot/dts
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Martin Kennedy 7f4b4c29f3 mpc85xx: Drop pci aliases to avoid domain changes 
As of upstream Linux commit 0fe1e96fef0a ("powerpc/pci: Prefer PCI
domain assignment via DT 'linux,pci-domain' and alias"), the PCIe
domain address is no longer numbered by the lowest 16 bits of the PCI
register address after a fallthrough. Instead of the fallthrough, the
enumeration process accepts the alias ID (as determined by
`of_alias_scan()`). This causes e.g.:

9000:00:00.0 PCI bridge: Freescale Semiconductor Inc P1020E (rev 11)
9000:01:00.0 Network controller: Qualcomm Atheros AR958x 802.11abgn ...

to become

0000:00:00.0 PCI bridge: Freescale Semiconductor Inc P1020E (rev 11)
0000:01:00.0 Network controller: Qualcomm Atheros AR958x 802.11abgn ...

... which then causes the sysfs path of the netdev to change,
invalidating the `wifi_device.path`s enumerated in
`/etc/config/wireless`.

One other solution might be to migrate the uci configuration, as was
done for mvebu in commit 0bd5aa89fc ("mvebu: Migrate uci config to
new PCIe path"). However, there are concerns that the sysfs path will
change once again once some upstream patches[^2][^3] are merged and
backported (and `CONFIG_PPC_PCI_BUS_NUM_DOMAIN_DEPENDENT` is enabled).

Instead, remove the aliases and allow the fallthrough to continue for
now. We will provide a migration in a later release.

This was first reported as a Github issue[^1].

[^1]: https://github.com/openwrt/openwrt/issues/10530
[^2]: https://lore.kernel.org/linuxppc-dev/20220706104308.5390-1-pali@kernel.org/t/#u
[^3]: https://lore.kernel.org/linuxppc-dev/20220706101043.4867-1-pali@kernel.org/

Fixes: #10530
Tested-by: Martin Kennedy <hurricos@gmail.com>
[Tested on the Aerohive HiveAP 330 and Extreme Networks WS-AP3825i]
Signed-off-by: Martin Kennedy <hurricos@gmail.com>
2022-09-02 21:21:31 +02:00
..
hiveap-330.dts mpc85xx: Drop pci aliases to avoid domain changes 2022-09-02 21:21:31 +02:00
panda.dts mpc85xx: Drop pci aliases to avoid domain changes 2022-09-02 21:21:31 +02:00
red-15w-rev1.dts mpc85xx: Drop pci aliases to avoid domain changes 2022-09-02 21:21:31 +02:00
tl-wdr4900-v1.dts mpc85xx: Drop pci aliases to avoid domain changes 2022-09-02 21:21:31 +02:00
ws-ap3710i.dts mpc85xx: Drop pci aliases to avoid domain changes 2022-09-02 21:21:31 +02:00
ws-ap3825i.dts mpc85xx: Drop pci aliases to avoid domain changes 2022-09-02 21:21:31 +02:00