diff options
| -rw-r--r-- | drivers/staging/greybus/greybus_protocols.h | 7 | ||||
| -rw-r--r-- | drivers/staging/greybus/uart.c | 15 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h index 089751c24117..ff371c44cdf4 100644 --- a/drivers/staging/greybus/greybus_protocols.h +++ b/drivers/staging/greybus/greybus_protocols.h @@ -1270,6 +1270,7 @@ struct gb_raw_send_request { #define GB_UART_TYPE_SEND_BREAK 0x06 #define GB_UART_TYPE_SERIAL_STATE 0x07 /* Unsolicited data */ #define GB_UART_TYPE_RECEIVE_CREDITS 0x08 +#define GB_UART_TYPE_FLUSH_FIFOS 0x09 /* Represents data from AP -> Module */ struct gb_uart_send_data_request { @@ -1335,6 +1336,12 @@ struct gb_uart_serial_state_request { __u8 control; } __packed; +struct gb_uart_serial_flush_request { + __u8 flags; +#define GB_SERIAL_FLAG_FLUSH_TRANSMITTER 0x01 +#define GB_SERIAL_FLAG_FLUSH_RECEIVER 0x02 +} __packed; + /* Loopback */ /* Version of the Greybus loopback protocol we support */ diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c index 14b3e9d06e9c..7dc9f9b873b1 100644 --- a/drivers/staging/greybus/uart.c +++ b/drivers/staging/greybus/uart.c @@ -317,6 +317,14 @@ static int send_break(struct gb_tty *gb_tty, u8 state) &request, sizeof(request), NULL, 0); } +static int gb_uart_flush(struct gb_tty *gb_tty, u8 flags) +{ + struct gb_uart_serial_flush_request request; + + request.flags = flags; + return gb_operation_sync(gb_tty->connection, GB_UART_TYPE_FLUSH_FIFOS, + &request, sizeof(request), NULL, 0); +} static struct gb_tty *get_gb_by_minor(unsigned minor) { @@ -745,6 +753,7 @@ static void gb_tty_port_shutdown(struct tty_port *port) { struct gb_tty *gb_tty; unsigned long flags; + int ret; gb_tty = container_of(port, struct gb_tty, port); @@ -756,6 +765,12 @@ static void gb_tty_port_shutdown(struct tty_port *port) kfifo_reset_out(&gb_tty->write_fifo); spin_unlock_irqrestore(&gb_tty->write_lock, flags); + ret = gb_uart_flush(gb_tty, GB_SERIAL_FLAG_FLUSH_TRANSMITTER); + if (ret) { + dev_err(&gb_tty->gbphy_dev->dev, + "error flushing transmitter: %d\n", ret); + } + gb_tty->close_pending = false; } |