Can not unload ath11k_pci and load it back

[Mark Herbert]

As I mentioned - if I build mhi as a module - card will not even start. 
it works only if mhi is compiled inside the kernel, and in this config I 
can not unload it.

On 07.10.2021 10:48, Kalle Valo wrote:
> Mark Herbert <mark.herbert42 at gmail.com> writes:
>
>> I've found similar bug files already - so not to create duplicates
>> simply commented there
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=214541
>>
>> Exactly - hibernation means saving state on disk and resuming later,
>> it is a very usefull feature when you are running out of battery and
>> want to save your work.
> Got it, thanks. So it seems we have two issues here: ath11k does not
> support hibernation and ath11k module reload failing. Let's handle the
> module reload failing in bug #214541, but can you file another bug about
> the missing support for hibernation? Let's have one issue per bug
> report, it's easier to manage bugzilla that way.
>
>> Also one more point I've found - if MHI is configured in the kernel -
>> the card is starting up on thr first boot and works. But if i
>> configure MHI as a module - it does not. MHI module do load. So do
>> ath11k and ath11k_pci.  But the last ath11k dmesg says :
>>
>> mhi mhi0: Wait for device to enter SBL or Mission mode
>>
>> Exactly as if I  do rmmod/modprobe sequence.
>>
>> I use latest BIOS from Dell (in fact upgrading 3.0.4 to 3.1.0 did not
>> cange anythng) ,  and have tried multiple kernels. Stable 5.14 series
>> and ath11k git tree (next and master-pending). Nothing helps.
>> Sometimes it woks out - I had couple of times successfully
>> rmmod/modprobe ath11k_pci but it s a kind of random and very rare
>> event ( I had it 2 times only).
>>
>> So for me it looks like an issue between MHI and ath11k , but
>> ubfortunately my knowledge is not enough to propose any solution here.
> On my NUC x86 test box I reload ath11k modules several times a day while
> I test ath11k but I always reload the mhi modules at the same time,
> maybe that makes the difference? Or XPS 13 9310 works differently from
> NUC, that's also possible.
>