linux-kernel - Re: [PATCH] wifi: ath11k: Defer on rproc

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Date:   Mon, 13 Nov 2023 15:39:46 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     Luca Weiss <luca.weiss@...rphone.com>
Cc:     Jeff Johnson <quic_jjohnson@...cinc.com>,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Luca Weiss <luca.weiss@...rphone.com>
Subject: Re: [PATCH] wifi: ath11k: Defer on rproc_get failure

Luca Weiss <luca.weiss@...rphone.com> wrote:

> 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.
> 
> Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-01264-QCAMSLSWPLZ-1.37886.3
> 
> Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>

Patch applied to ath-next branch of ath.git, thanks.

2a3ec40b98b4 wifi: ath11k: Defer on rproc_get failure

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20231027-ath11k-rproc-defer-v1-1-f6b6a812cd18@fairphone.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches