linux-kernel - Re: [PATCH v4] bluetooth: hci_qca: Fix qca6390 enable failure after warm reboot

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Message-ID: <377e1840-e8e7-38f6-cb7a-2532b07249f0@codeaurora.org>
Date:   Thu, 28 May 2020 17:18:35 +0800
From:   Zijun Hu <zijuhu@...eaurora.org>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, bgodavar@...eaurora.org,
        c-hbandi@...eaurora.org, hemantg@...eaurora.org, mka@...omium.org,
        rjliao@...eaurora.org
Subject: Re: [PATCH v4] bluetooth: hci_qca: Fix qca6390 enable failure after
 warm reboot



On 5/28/2020 4:19 PM, Marcel Holtmann wrote:
> Hi Zijun,
> 
>> Warm reboot can not restore qca6390 controller baudrate
>> to default due to lack of controllable BT_EN pin or power
>> supply, so fails to download firmware after warm reboot.
>>
>> Fixed by sending EDL_SOC_RESET VSC to reset controller
>> within added device shutdown implementation.
>>
>> Signed-off-by: Zijun Hu <zijuhu@...eaurora.org>
>> ---
>> drivers/bluetooth/hci_qca.c | 33 +++++++++++++++++++++++++++++++++
>> 1 file changed, 33 insertions(+)
>>
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index e4a6823..8e03bfe 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -1975,6 +1975,38 @@ static void qca_serdev_remove(struct serdev_device *serdev)
>> 	hci_uart_unregister_device(&qcadev->serdev_hu);
>> }
>>
>> +static void qca_serdev_shutdown(struct device *dev)
>> +{
>> +	int ret;
>> +	int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
>> +	struct serdev_device *serdev = to_serdev_device(dev);
>> +	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
>> +	const u8 ibs_wake_cmd[] = { 0xFD };
>> +	const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };
> 
> struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
> no.
this dev is serdev_device not hci_dev
>> +
>> +	if (qcadev->btsoc_type == QCA_QCA6390) {
>> +		serdev_device_write_flush(serdev);
>> +		ret = serdev_device_write_buf(serdev,
>> +				ibs_wake_cmd, sizeof(ibs_wake_cmd));
>> +		if (ret < 0) {
>> +			BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
> 
> And then use bt_dev_err here.
as explained above about dev, bt_dev_err is not a good selection at
this serdev_device shudown operation.
> 
>> +			return;
>> +		}
>> +		serdev_device_wait_until_sent(serdev, timeout);
>> +		usleep_range(8000, 10000);
>> +
>> +		serdev_device_write_flush(serdev);
>> +		ret = serdev_device_write_buf(serdev,
>> +				edl_reset_soc_cmd, sizeof(edl_reset_soc_cmd));
>> +		if (ret < 0) {
>> +			BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
>> +			return;
>> +		}
>> +		serdev_device_wait_until_sent(serdev, timeout);
>> +		usleep_range(8000, 10000);
>> +	}
>> +}
>> +
>> static int __maybe_unused qca_suspend(struct device *dev)
>> {
>> 	struct hci_dev *hdev = container_of(dev, struct hci_dev, dev);
>> @@ -2100,6 +2132,7 @@ static struct serdev_device_driver qca_serdev_driver = {
>> 		.name = "hci_uart_qca",
>> 		.of_match_table = of_match_ptr(qca_bluetooth_of_match),
>> 		.acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
>> +		.shutdown = qca_serdev_shutdown,
>> 		.pm = &qca_pm_ops,
>> 	},
>> };
> 
> Regards
> 
> Marcel
> 

-- 
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