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mxser: move FIFO clearing to mxser_disable_and_clear_FIFO()

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This code is used on two places, make a helper for disabling and
clearing FIFOs. And demangle the too complicated 'if' by using a local
variable.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210922075938.31390-5-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-09-22 09:59:36 +02:00 committed by Greg Kroah-Hartman
parent bf1434c1b7
commit ee7e5e66f2
1 changed files with 12 additions and 14 deletions
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26
drivers/tty/mxser.c
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@ -706,6 +706,16 @@ static void mxser_check_modem_status(struct tty_struct *tty,
mxser_handle_cts(tty, port, status);
}
static void mxser_disable_and_clear_FIFO(struct mxser_port *info)
{
u8 fcr = UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
if (info->board->must_hwid)
fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
outb(fcr, info->ioaddr + UART_FCR);
}
static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
{
struct mxser_port *info = container_of(port, struct mxser_port, port);
@ -730,13 +740,7 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
* Clear the FIFO buffers and disable them
* (they will be reenabled in mxser_change_speed())
*/
if (info->board->must_hwid)
outb((UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT |
MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
else
outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
info->ioaddr + UART_FCR);
mxser_disable_and_clear_FIFO(info);
/*
* At this point there's no way the LSR could still be 0xFF;
@ -824,13 +828,7 @@ static void mxser_shutdown_port(struct tty_port *port)
outb(0x00, info->ioaddr + UART_IER);
/* clear Rx/Tx FIFO's */
if (info->board->must_hwid)
outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
MOXA_MUST_FCR_GDA_MODE_ENABLE,
info->ioaddr + UART_FCR);
else
outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
info->ioaddr + UART_FCR);
mxser_disable_and_clear_FIFO(info);
/* read data port to reset things */
(void) inb(info->ioaddr + UART_RX);