linux-kernel - Re: [PATCH v2 1/3] rsi: fix occasional initialisation failure with BT coex

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Message-Id: <20210921054319.087CEC4360D@smtp.codeaurora.org>
Date:   Tue, 21 Sep 2021 05:43:19 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Martin Fuzzey <martin.fuzzey@...wbird.group>
Cc:     linux-wireless@...r.kernel.org,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Siva Rebbagondla <siva8118@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Prameela Rani Garnepudi <prameela.j04cs@...il.com>,
        linux-kernel@...r.kernel.org,
        Martin Fuzzey <martin.fuzzey@...wbird.group>
Subject: Re: [PATCH v2 1/3] rsi: fix occasional initialisation failure with BT
 coex

Martin Fuzzey <martin.fuzzey@...wbird.group> wrote:

> When BT coexistence is enabled (eg oper mode 13, which is the default)
> the initialisation on startup sometimes silently fails.
> 
> In a normal initialisation we see
> 	usb 1-1.3: Product: Wireless USB Network Module
> 	usb 1-1.3: Manufacturer: Redpine Signals, Inc.
> 	usb 1-1.3: SerialNumber: 000000000001
> 	rsi_91x: rsi_probe: Initialized os intf ops
> 	rsi_91x: rsi_load_9116_firmware: Loading chunk 0
> 	rsi_91x: rsi_load_9116_firmware: Loading chunk 1
> 	rsi_91x: rsi_load_9116_firmware: Loading chunk 2
> 	rsi_91x: Max Stations Allowed = 1
> 
> But sometimes the last log is missing and the wlan net device is
> not created.
> 
> Running a userspace loop that resets the hardware via a GPIO shows the
> problem occurring ~5/100 resets.
> 
> The problem does not occur in oper mode 1 (wifi only).
> 
> Adding logs shows that the initialisation state machine requests a MAC
> reset via rsi_send_reset_mac() but the firmware does not reply, leading
> to the initialisation sequence being incomplete.
> 
> Fix this by delaying attaching the BT adapter until the wifi
> initialisation has completed.
> 
> With this applied I have done > 300 reset loops with no errors.
> 
> Fixes: 716b840c7641 ("rsi: handle BT traffic in driver")
> Signed-off-by: Martin Fuzzey <martin.fuzzey@...wbird.group>
> CC: stable@...r.kernel.org

3 patches applied to wireless-drivers-next.git, thanks.

9b14ed6e11b7 rsi: fix occasional initialisation failure with BT coex
99ac60188212 rsi: fix key enabled check causing unwanted encryption for vap_id > 0
b515d097053a rsi: fix rate mask set leading to P2P failure

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/1630337206-12410-2-git-send-email-martin.fuzzey@flowbird.group/

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