Re: [PATCH] wifi: ath11k: Defer on rproc_get failure

["Luca Weiss" <luca.weiss@fairphone.com>]

On Mon Nov 13, 2023 at 4:37 PM CET, Kalle Valo wrote:
> "Luca Weiss" <luca.weiss@fairphone.com> writes:
>
> > On Fri Oct 27, 2023 at 10:25 AM CEST, Kalle Valo wrote:
> >
> >> Luca Weiss <luca.weiss@fairphone.com> writes:
> >>
> >> > If we already have gotten the rproc_handle (meaning the "qcom,rproc"
> >> > property is defined in the devicetree), it's a valid state that the
> >> > remoteproc module hasn't probed yet so we should defer probing instead
> >> > of just failing to probe.
> >> >
> >> > This resolves a race condition when the ath11k driver probes and fails
> >> > before the wpss remoteproc driver has probed, like the following:
> >> >
> >> >   [    6.232360] ath11k 17a10040.wifi: failed to get rproc
> >> >   [    6.232366] ath11k 17a10040.wifi: failed to get rproc: -22
> >> >   [    6.232478] ath11k: probe of 17a10040.wifi failed with error -22
> >> >        ...
> >> >   [    6.252415] remoteproc remoteproc2: 8a00000.remoteproc is available
> >> >   [    6.252776] remoteproc remoteproc2: powering up 8a00000.remoteproc
> >> >   [    6.252781] remoteproc remoteproc2: Booting fw image qcom/qcm6490/fairphone5/wpss.mdt, size 7188
> >> >
> >> > So, defer the probe if we hit that so we can retry later once the wpss
> >> > remoteproc is available.
> >> >
> >> > Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
> >>
> >> Did you test this on a real device? If yes, what ath11k hardware and firmware
> >> did you use? We use Tested-on tag to document that:
> >>
> >> https://wireless.wiki.kernel.org/en/users/drivers/ath11k/submittingpatches#tested-on_tag
> >
> > Hi,
> >
> > Yes I tested this on qcm6490-fairphone-fp5 including some extra patches
> > for wpss-pas remoteproc support (nothing special, just adding it to the
> > existing PAS driver) and wifi enablement in dts.
>
> Nice, do you have a link to the patches or a git tree which has
> everything? And how difficult would it be for me to run vanilla
> kernel.org kernel (no vendor kernels or anything like that) on Fairphone
> 5? Any documentation available for that?

I'm happy you ask ;)
Currently pure kernel.org doesn't boot much because quite a few patches
are still being upstreamed, like this one.

In terms of git tree, this here is the last tag for everything I have
working on the device, it's ~100 patches on top of v6.6, a good chunk
should be merged for v6.7-rc1 already:
https://github.com/z3ntu/linux/commits/v6.6.0-sc7280

You can flash the device with that kernel and postmarketOS using the
pmbootstrap tooling:
https://wiki.postmarketos.org/wiki/Fairphone_5_(fairphone-fp5)
https://wiki.postmarketos.org/wiki/Pmbootstrap

Let me know if you hit any issues, or if I can help somehow.

>
> I'm asking because I don't have a test setup for WCN6750 right now. It
> would be awesome if I could use Fairphone for testing :)
>
> > I built this line from info from the dmesg, hope it's okay:
> >
> > Tested-on: wcn6750 hw1.0 AHB WLAN.MSL.1.0.1-01264-QCAMSLSWPLZ-1.37886.3
>
> Thanks, I added that to the commit message.
>
> > And thinking about it, a Fixes tag would also be appropriate for this
> > patch. The code was moved to a different file in commit ba929d6fe31a
> > ("ath11k: Remove rproc references from common core layer") but I think
> > this tag should be correct.
> >
> > Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
>
> Ok, I added that as well.

Thanks!

Regards
Luca