diff options
Diffstat (limited to 'drivers/staging/cg2900/bluetooth/cg2900_uart.c')
| -rw-r--r-- | drivers/staging/cg2900/bluetooth/cg2900_uart.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/staging/cg2900/bluetooth/cg2900_uart.c b/drivers/staging/cg2900/bluetooth/cg2900_uart.c index 79b4efa189c..783b8327786 100644 --- a/drivers/staging/cg2900/bluetooth/cg2900_uart.c +++ b/drivers/staging/cg2900/bluetooth/cg2900_uart.c @@ -59,6 +59,14 @@ #define UART_RX_TIMEOUT 10 #define UART_RESP_TIMEOUT 1000 #define UART_RESUME_TIMEOUT 20 +/* Minimum time host should maintain the break */ +#define UART_MIN_BREAK_ON_TIME 5 + +/* Timers used in microseconds */ +/* Minimum time required after sending the last data to apply break */ +#define UART_MIN_TIME_BEFORE_APPLYING_BREAK 900 +/* Minimum time required after exiting break condition */ +#define UART_MIN_BREAK_OFF_TIME 200 /* Max latency in microseconds for PM QoS to achieve max throughput */ #define CG2900_PM_QOS_LATENCY 30 @@ -647,6 +655,7 @@ static void wake_up_chip(struct uart_info *uart_info) /* Unset BREAK. */ dev_dbg(MAIN_DEV, "wake_up_chip: Clear break\n"); hci_uart_set_break(uart_info->hu, BREAK_OFF); + udelay(UART_MIN_BREAK_OFF_TIME); dev_dbg(MAIN_DEV, "New sleep_state: CHIP_AWAKE\n"); uart_info->sleep_state = CHIP_AWAKE; @@ -714,6 +723,7 @@ static void set_chip_sleep_mode(struct work_struct *work) uart_info->baud_rate); hci_uart_flow_ctrl(uart_info->hu, FLOW_ON); hci_uart_set_break(uart_info->hu, BREAK_OFF); + udelay(UART_MIN_BREAK_OFF_TIME); dev_dbg(MAIN_DEV, "New sleep_state: CHIP_AWAKE\n"); uart_info->sleep_state = CHIP_AWAKE; @@ -745,7 +755,10 @@ static void set_chip_sleep_mode(struct work_struct *work) } dev_dbg(MAIN_DEV, "sleep_timer_expired: Set break\n"); + udelay(UART_MIN_TIME_BEFORE_APPLYING_BREAK); hci_uart_set_break(uart_info->hu, BREAK_ON); + schedule_timeout_killable( + msecs_to_jiffies(UART_MIN_BREAK_ON_TIME)); dev_dbg(MAIN_DEV, "New sleep_state: CHIP_FALLING_ASLEEP\n"); uart_info->sleep_state = CHIP_FALLING_ASLEEP; @@ -1405,6 +1418,7 @@ static void uart_set_chip_power(struct cg2900_chip_dev *dev, bool chip_on) hci_uart_flow_ctrl(uart_info->hu, FLOW_ON); hci_uart_set_break(uart_info->hu, BREAK_OFF); + udelay(UART_MIN_BREAK_OFF_TIME); } else { /* Turn off the chip.*/ switch (uart_info->sleep_state) { @@ -1412,6 +1426,7 @@ static void uart_set_chip_power(struct cg2900_chip_dev *dev, bool chip_on) break; case CHIP_FALLING_ASLEEP: hci_uart_set_break(uart_info->hu, BREAK_OFF); + udelay(UART_MIN_BREAK_OFF_TIME); break; case CHIP_SUSPENDED: case CHIP_ASLEEP: |