From: Ji-Ze Hong (Peter Hong) Date: Thu, 30 Jan 2020 05:47:48 +0000 (+0800) Subject: USB: serial: f81232: add tx_empty function X-Git-Tag: io_uring-5.7-2020-04-09~39^2~5^2~10 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=98405f81036d;p=linux-block.git USB: serial: f81232: add tx_empty function Add tx_empty() function for F81232. Without this, console redirection will get garbage data. Signed-off-by: Ji-Ze Hong (Peter Hong) Signed-off-by: Johan Hovold --- diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index c07d376c743d..793d0b30e347 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -685,6 +685,20 @@ static void f81232_dtr_rts(struct usb_serial_port *port, int on) f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS); } +static bool f81232_tx_empty(struct usb_serial_port *port) +{ + int status; + u8 tmp; + + status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp); + if (!status) { + if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT) + return false; + } + + return true; +} + static int f81232_carrier_raised(struct usb_serial_port *port) { u8 msr; @@ -820,6 +834,7 @@ static struct usb_serial_driver f81232_device = { .tiocmget = f81232_tiocmget, .tiocmset = f81232_tiocmset, .tiocmiwait = usb_serial_generic_tiocmiwait, + .tx_empty = f81232_tx_empty, .process_read_urb = f81232_process_read_urb, .read_int_callback = f81232_read_int_callback, .port_probe = f81232_port_probe,