Martin Fuzzey <martin.fuzzey@flowbird.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@flowbird.group>
> CC: stable@xxxxxxxxxxxxxxx
Failed to apply, please rebase on top of wireless-drivers-next.
error: sha1 information is lacking or useless (drivers/net/wireless/rsi/rsi_91x_mgmt.c).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch' to see the failed patch
Applying: rsi: fix occasional initialisation failure with BT coex
Patch failed at 0001 rsi: fix occasional initialisation failure with BT coex
3 patches set to Changes Requested.
12423167 [1/3] rsi: fix occasional initialisation failure with BT coex
12423171 [2/3] rsi: fix key enabled check causing unwanted encryption for vap_id > 0
12423173 [3/3] rsi: fix rate mask set leading to P2P failure
--
https://patchwork.kernel.org/project/linux-wireless/patch/1628245403-2517-2-git-send-email-martin.fuzzey@flowbird.group/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
