[regression] mhi: ath11k resume fails on some devices

[Kalle Valo]

(adding the new mhi list, yay)

Hi Loic,

Loic Poulain <loic.poulain at linaro.org> writes:

>> Loic Poulain <loic.poulain at linaro.org> writes:
>>
>> > On Thu, 16 Sept 2021 at 10:00, Kalle Valo <kvalo at codeaurora.org> wrote:
>>
>> >> At the moment I'm running my tests with commit 020d3b26c07a reverted and
>> >> everything works without problems. Is there a simple way to fix this? Or
>> >> maybe we should just revert the commit? Commit log and kernel logs from
>> >> a failing case below.
>> >
>> > Do you have log of success case?
>>
>> A log from a successful case in the end of email, using v5.15-rc1 plus
>> revert of commit 020d3b26c07abe27.
>>
>> > To me, the device loses power, that is why MHI resuming is failing.
>> > Normally the device should be properly recovered/reinitialized. Before
>> > that patch the power loss was simply not detected (or handled at
>> > higher stack level).
>>
>> Currently in ath11k we always keep the firmware running when in suspend,
>> this is a workaround due to problems between mac80211 and MHI stack.
>> IIRC the problem was something related MHI creating struct device during
>> resume or something like that.
>
> Could you give a try with the attached patch? It should solve your
> issue without breaking modem support.

Sorry for taking so long, but I now tested your patch on top of
v5.15-rc3 and, as expected, everything works as before with QCA6390 on
NUC x86 testbox.

Tested-by: Kalle Valo <kvalo at codeaurora.org>

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