From bb2500ab0270aa0d1d39614f08f4f9a2dc0df8c1 Mon Sep 17 00:00:00 2001 From: Rocky Liao Date: Wed, 15 Jan 2020 16:55:51 +0800 Subject: Bluetooth: hci_qca: Retry btsoc initialize when it fails 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 symptoms is the firmware downloading failed due to the UART write timed out. 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 can work around most of the failures and make Bluetooth finally works. Signed-off-by: Rocky Liao Reviewed-by: Matthias Kaehlcke Signed-off-by: Marcel Holtmann --- drivers/bluetooth/hci_qca.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index ecb74965be10..1139142e8eed 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -55,6 +55,9 @@ /* Controller debug log header */ #define QCA_DEBUG_HANDLE 0x2EDC +/* max retry count when init fails */ +#define MAX_INIT_RETRIES 3 + /* Controller dump header */ #define QCA_SSR_DUMP_HANDLE 0x0108 #define QCA_DUMP_PACKET_SIZE 255 @@ -1539,6 +1542,7 @@ static int qca_setup(struct hci_uart *hu) struct hci_dev *hdev = hu->hdev; struct qca_data *qca = hu->priv; unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; + unsigned int retries = 0; enum qca_btsoc_type soc_type = qca_soc_type(hu); const char *firmware_name = qca_get_firmware_name(hu); int ret; @@ -1559,6 +1563,7 @@ static int qca_setup(struct hci_uart *hu) bt_dev_info(hdev, "setting up %s", qca_is_wcn399x(soc_type) ? "wcn399x" : "ROME"); +retry: ret = qca_power_on(hdev); if (ret) return ret; @@ -1613,6 +1618,20 @@ static int qca_setup(struct hci_uart *hu) * patch/nvm-config is found, so run with original fw/config. */ ret = 0; + } else { + if (retries < MAX_INIT_RETRIES) { + qca_power_shutdown(hu); + if (hu->serdev) { + serdev_device_close(hu->serdev); + ret = serdev_device_open(hu->serdev); + if (ret) { + bt_dev_err(hdev, "failed to open port"); + return ret; + } + } + retries++; + goto retry; + } } /* Setup bdaddr */ -- cgit v1.2.3