[PATCH] wifi: ath11k: Defer on rproc_get failure

[Kalle Valo]

Luca Weiss <luca.weiss at 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 at 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

I can add that in the pending branch if you provide the info.

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