[OpenWrt-Devel] [PATCH] mvebu: Add support for kernel 4.19

Marek Behun marek.behun at nic.cz
Thu May 16 17:41:57 EDT 2019

On Thu, 16 May 2019 22:35:35 +0200
Tomasz Maciej Nowak <tomek_n at o2.pl> wrote:

> What I would like to ask is if You've had also link training issues with PCIe port
> and particular Atheros/Qualcomm (AR3890, QCA9890) wifi cards on Turris MOX? Which we
> work around with these patches:
> 527-PCI-aardvark-allow-to-specify-link-capability.patch
> 528-arm64-dts-armada-3720-espressobin-set-max-link-to-ge.patch
> Or do You use different chip vendors?

Hi Tomasz,

yes, the problematic chipsets are 9880 and 9890. Forcing link to PCIe
1.0 did not help on Turris Mox.
After weeks of playing with the card I discovered that it could be
solved by tweaking the length of the PERST signal (reset-gpios) in the
aardvark driver. This is how I made it work on 4.14 on Turris Mox. On
4.19 it is not needed, but with the new patches by Miquel Raynal which
will be in kernel 5.2 or 5.3 (adding support for suspend/resume) this
again breaks, because the PERST signal is manipulated differently. I
did not solve this issue, but I think it will again be done via the
PERST signal.


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