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Message-ID: <7cd6f395-1f1b-4a73-840f-d70fff5da220@linaro.org>
Date: Thu, 18 Apr 2024 18:48:29 +0200
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Subject: Re: [PATCH v1 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, wt@penguintechs.org,
 bartosz.golaszewski@linaro.org
References: <1713449192-25926-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713449192-25926-3-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: <1713449192-25926-3-git-send-email-quic_zijuhu@quicinc.com>
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On 18/04/2024 16:06, Zijun Hu wrote:
> From: Zijun Hu <zijuhu@qti.qualcomm.com>
> 
> Commit 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on closed
> serdev") will cause regression issue for QCA_QCA6390 if BT reset pin is
> not configured by DT or ACPI, the regression issue is that BT can't be
> enabled after disable then warm reboot, fixed by correcting conditions
> for sending the VSC reset controller within qca_serdev_shutdown().

I have trouble understanding what is the bug. Can you rephrase it?

> 
> 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 | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 160175a23a49..2a47a60ecc25 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2437,15 +2437,21 @@ 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)) {
> +			BT_INFO("QCA do not need to send EDL_RESET_REQ");
>  			return;
> +		}
> +
> +		if (hci_dev_test_flag(hdev, HCI_SETUP)) {

Commit msg does not help me at all to understand why you are changing
the test bits.

> +			BT_INFO("QCA do not send EDL_RESET_REQ");
> +			return;
> +		}
>  
> +		BT_INFO("QCA start to send EDL_RESET_REQ");

Why debugging info is part of the fix?

Best regards,
Krzysztof