CONFIG_PCIEASPM breaks PCIe on Marvell Armada 385 machine

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Hello,

on an Marvell Armada 385 based machine (Turris Omnia) with 4.9 the
ath10k driver fails to bind to the matching hardware if CONFIG_PCIEASPM
is enabled:

# dmesg | grep ath
[    7.207770] ath10k_pci 0000:02:00.0: Refused to change power state, currently in D3
[    7.237955] ath10k_pci 0000:02:00.0: failed to wake up device : -110
[    7.238146] ath10k_pci: probe of 0000:02:00.0 failed with error -110

if however PCIEASPM is off, the driver probes correctly and the ath10k
adapter works fine.

I wonder if someone has an idea what needs to be done to fix this
problem. (OK, I could disable PCIEASPM, but I'd like to have a solution
for a distribution kernel where I think PCIEASPM=y is sensible in
general.)

Best regards
Uwe

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