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Date: Sat, 20 Apr 2024 13:07:25 +0200
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Subject: Re: [PATCH v3 2/2] Bluetooth: qca: Fix BT enable failure for
 QCA_QCA6390 after disable then warm reboot
To: Zijun Hu <quic_zijuhu@quicinc.com>, luiz.dentz@gmail.com,
 luiz.von.dentz@intel.com, marcel@holtmann.org
Cc: linux-bluetooth@vger.kernel.org, bartosz.golaszewski@linaro.org,
 wt@penguintechs.org
References: <1713449192-25926-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713564212-21725-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713564212-21725-3-git-send-email-quic_zijuhu@quicinc.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <1713564212-21725-3-git-send-email-quic_zijuhu@quicinc.com>
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On 20/04/2024 00:03, Zijun Hu wrote:
> From: Zijun Hu <zijuhu@qti.qualcomm.com>
> 
> Commit 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on closed
> serdev") will cause below regression issue:
> 
> BT can't be enabled after below steps:
> cold boot -> enable BT -> disable BT -> warm reboot -> BT enable failure
> if BT reset pin is not configured within DT|ACPI for QCA_QCA6390.

Please mention if QCA6390 requires reset pin, according to datasheet or
some hardware guideline.

> 
> Fixed by sending the VSC to reset controller within qca_serdev_shutdown()
> once BT was ever enabled.
> 
> Fixes: 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on closed serdev")
> Reported-by: Wren Turkal <wt@penguintechs.org>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218726
> Signed-off-by: Zijun Hu <zijuhu@qti.qualcomm.com>
> Tested-by: Wren Turkal <wt@penguintechs.org>
> ---
>  drivers/bluetooth/hci_qca.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 0934e74112a6..3f5173f1180b 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2438,13 +2438,12 @@ static void qca_serdev_shutdown(struct device *dev)
>  	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
>  	struct hci_uart *hu = &qcadev->serdev_hu;
>  	struct hci_dev *hdev = hu->hdev;
> -	struct qca_data *qca = hu->priv;
>  	const u8 ibs_wake_cmd[] = { 0xFD };
>  	const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };
>  
>  	if (qcadev->btsoc_type == QCA_QCA6390) {
> -		if (test_bit(QCA_BT_OFF, &qca->flags) ||
> -		    !test_bit(HCI_RUNNING, &hdev->flags))
> +		if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks) ||
> +		    hci_dev_test_flag(hdev, HCI_SETUP))
>  			return;

I am sorry, but why do we need to perform shutdown procedure now if
device is off?

I raised questions about this and I still don't understand. Not much got
better comparing to previous version. Actually, I have no clue what
changed. Where is the changelog?


Best regards,
Krzysztof