Ath10k leaves AR9880 in a state that will not enumerate again when CPU warm booted

Adrian Chadd adrian at
Wed Nov 12 13:43:24 PST 2014

Is the length / number of card resets during a warm boot differ to cold boot?

There's a known behavioural quirk where if the reset line isn't held
for long enough or there's too short a gap between one and another
reset assertion, the NIC doesn't fully initialise right.


On 12 November 2014 13:34, David Dailey <daileycrew at> wrote:
> I discovered that this issue seems to follow at least 2 different
> chipsets (AR9880 and AR9890) but doesn't happen with at least two BCM
> chipsets.  And the enumeration failing after a warm boot doesn't
> depend on ath10k loading at all.  Even with the module not present on
> the system, the device doesn't enumerate after cold boot.  So it
> appears this is something unique to the PCIe core on Atheros, not
> ath10k.  I guess the only hope would be if somehow the unload of the
> driver could restore the chipset back to a state where it would
> enumerate again, but I don't have information on the chipset at that
> level.
> Dave
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