[Bug 218726] qca6390 bluetooth fails after disabling/re-enabling bluetooth

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218726

--- Comment #32 from Zijun Hu (quic_zijuhu@quicinc.com) ---
there are two issues as described below.

1) cold boot -> enable BT -> disable BT -> 2nd Enable BT -> 2nd Disable BT....
BT can't be enabled for 2nd and later enabled operations.

this issue is caused by below commit. i have reverted it and submit a formal
below patch
https://patchwork.kernel.org/project/bluetooth/patch/1713354823-17826-1-git-send-email-quic_zijuhu@quicinc.com/

Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with
gpiod_get_optional()")


2) cold boot (power off then power on) -> enable BT -> warm reboot after
disable BT or NOT -> enable is failed to be Enable after warm reboot.

let us explain the 2) issue we are checking as below:
your device does not have H/W reset way since BT reset pin is not configured.
so 
qca_serdev_shutdown() needs to send VSC EDL_RESET_REQ to make controller return
to initial clean state. the only reason for 2) happens is that EDL_RESET_REQ is
not sent successfully during warm reset.
let me check it.

we can get logs for issue 2) by this way.
cold boot -> enable BT -> disable BT -> unload hci_uart.ko -> dmesg kernel log
to see if EDL_RESET_REQ was sent successfully.

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