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author | Martin Kennedy <hurricos@gmail.com> | 2022-08-29 20:47:24 -0400 |
---|---|---|
committer | Hauke Mehrtens <hauke@hauke-m.de> | 2022-09-02 21:21:31 +0200 |
commit | 7f4b4c29f3489697dca7495216460d0ed5023e02 (patch) | |
tree | c67c774bc500f1cb2a591113f2ff17d33aef55a0 /target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts | |
parent | e9f12931e60ee291cd7d2c8fd19a14682dae0197 (diff) | |
download | upstream-7f4b4c29f3489697dca7495216460d0ed5023e02.tar.gz upstream-7f4b4c29f3489697dca7495216460d0ed5023e02.tar.bz2 upstream-7f4b4c29f3489697dca7495216460d0ed5023e02.zip |
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 0bd5aa89fcf2 ("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>
Diffstat (limited to 'target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts')
-rw-r--r-- | target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts b/target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts index 26f742b222..2ea6718468 100644 --- a/target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts +++ b/target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dts @@ -253,3 +253,16 @@ }; /include/ "fsl/p1020si-post.dtsi" + +/* + * For the OpenWrt 22.03 release, since Linux 5.10.138 now uses + * aliases to determine PCI domain numbers, drop aliases so as not to + * change the sysfs path of our wireless netdevs. + */ + +/ { + aliases { + /delete-property/ pci0; + /delete-property/ pci1; + }; +}; |