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    Subject[PATCH v2 2/4] Bluetooth: hci_qca: Retry btsoc initialize when it fails
    Date
    This patch adds the retry of btsoc initialization when it fails. There are
    reports that the btsoc initialization may fail on some platforms but the
    repro ratio is very low. The failure may be caused by UART, platform HW or
    the btsoc itself but it's very difficlut to root cause, given the repro
    ratio is very low. Add a retry for the btsoc initialization will resolve
    most of the failures and make Bluetooth finally works.

    Signed-off-by: Rocky Liao <rjliao@codeaurora.org>
    ---

    Changes in v2: None

    drivers/bluetooth/hci_qca.c | 26 ++++++++++++++++++++++++++
    1 file changed, 26 insertions(+)

    diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
    index 43fd84028786..45042aa27fa4 100644
    --- a/drivers/bluetooth/hci_qca.c
    +++ b/drivers/bluetooth/hci_qca.c
    @@ -53,6 +53,9 @@
    /* Controller debug log header */
    #define QCA_DEBUG_HANDLE 0x2EDC

    +/* max retry count when init fails */
    +#define QCA_MAX_INIT_RETRY_COUNT 3
    +
    enum qca_flags {
    QCA_IBS_ENABLED,
    QCA_DROP_VENDOR_EVENT,
    @@ -1257,7 +1260,9 @@ static int qca_setup(struct hci_uart *hu)
    {
    struct hci_dev *hdev = hu->hdev;
    struct qca_data *qca = hu->priv;
    + struct qca_serdev *qcadev;
    unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
    + unsigned int init_retry_count = 0;
    enum qca_btsoc_type soc_type = qca_soc_type(hu);
    const char *firmware_name = qca_get_firmware_name(hu);
    int ret;
    @@ -1275,6 +1280,7 @@ static int qca_setup(struct hci_uart *hu)
    */
    set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);

    +retry:
    if (qca_is_wcn399x(soc_type)) {
    bt_dev_info(hdev, "setting up wcn3990");

    @@ -1293,6 +1299,12 @@ static int qca_setup(struct hci_uart *hu)
    return ret;
    } else {
    bt_dev_info(hdev, "ROME setup");
    + if (hu->serdev) {
    + qcadev = serdev_device_get_drvdata(hu->serdev);
    + gpiod_set_value_cansleep(qcadev->bt_en, 1);
    + /* Controller needs time to bootup. */
    + msleep(150);
    + }
    qca_set_speed(hu, QCA_INIT_SPEED);
    }

    @@ -1329,6 +1341,20 @@ static int qca_setup(struct hci_uart *hu)
    * patch/nvm-config is found, so run with original fw/config.
    */
    ret = 0;
    + } else {
    + if (init_retry_count < QCA_MAX_INIT_RETRY_COUNT) {
    + qca_power_off(hdev);
    + if (hu->serdev) {
    + serdev_device_close(hu->serdev);
    + ret = serdev_device_open(hu->serdev);
    + if (ret) {
    + bt_dev_err(hu->hdev, "open port fail");
    + return ret;
    + }
    + }
    + init_retry_count++;
    + goto retry;
    + }
    }

    /* Setup bdaddr */
    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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