ipq40xx: 5.10: fix ar40xx driver
authorNick Hainke <vincent@systemli.org>
Mon, 18 Apr 2022 13:04:25 +0000 (15:04 +0200)
committerDavid Bauer <mail@david-bauer.net>
Thu, 28 Apr 2022 22:27:58 +0000 (00:27 +0200)
commitd4053d2e8e098c53d6fc6ab860ba71cd8edf5455
tree296d12407f131b2525160227e9deb9687a84ed04
parent5a117042442bbeb1712999a1eb1c677f72a77158
ipq40xx: 5.10: fix ar40xx driver

This commit is completely based on the work of adron-s:
https://github.com/openwrt/openwrt/pull/4721#issuecomment-1101108651

The commit fixes the data corruption on TX packets. Packets are
transmitted, but their contents are replaced with zeros. This error is
caused by the lack of guard (50 ms) intervals between calibration phases.
This error is treated by adding mdelay(50) to the calibration function
code. In the original qca-ssda code [0], these mdelays were existing, but
in the ar41xx.c they are gone.

Tested on:
- Fritz!Box 4040
- Fritz!Box 7530
- Mikrotik SXTsq 5AC
- ZyXEL NBG6617

- [0] https://git.codelinaro.org/clo/qsdk/oss/lklm/qca-ssdk/-/blob/NHSS.QSDK.11.4/src/init/ssdk_init.c#L2072

Suggested-by: Serhii Serhieiev <adron@mstnt.com>
Reviewed-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Nick Hainke <vincent@systemli.org>
(cherry picked from commit ab7e53e5cce703c7a62efbe1d41fb94c2228a178)
target/linux/ipq40xx/files-5.10/drivers/net/mdio/ar40xx.c