diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2014-11-05 21:11:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-07 01:57:27 +0300 |
| commit | cab68f89546ba5a04bf28aaeaca841d4ccc2fd52 (patch) | |
| tree | 77aa632377f99150cf70619a389a3de2790f2d86 /drivers/tty/serial/amba-pl010.c | |
| parent | d41510ce2f071c9ccb1903d7a5135443a57dbe4e (diff) | |
| download | linux-cab68f89546ba5a04bf28aaeaca841d4ccc2fd52.tar.xz | |
serial: Test/disable MSIs if switching from N_PPS
Switching to the N_PPS line discipline may require enabling
modem status interrupts; conversely switching from N_PPS may
require disabling modem status interrupts.
Affected drivers:
8250
amba-pl010
atmel
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/amba-pl010.c')
| -rw-r--r-- | drivers/tty/serial/amba-pl010.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c index 194108b0de84..5d41d5b92619 100644 --- a/drivers/tty/serial/amba-pl010.c +++ b/drivers/tty/serial/amba-pl010.c @@ -106,6 +106,16 @@ static void pl010_stop_rx(struct uart_port *port) writel(cr, uap->port.membase + UART010_CR); } +static void pl010_disable_ms(struct uart_port *port) +{ + struct uart_amba_port *uap = (struct uart_amba_port *)port; + unsigned int cr; + + cr = readb(uap->port.membase + UART010_CR); + cr &= ~UART010_CR_MSIE; + writel(cr, uap->port.membase + UART010_CR); +} + static void pl010_enable_ms(struct uart_port *port) { struct uart_amba_port *uap = @@ -486,8 +496,14 @@ static void pl010_set_ldisc(struct uart_port *port, struct ktermios *termios) spin_lock_irq(&port->lock); pl010_enable_ms(port); spin_unlock_irq(&port->lock); - } else + } else { port->flags &= ~UPF_HARDPPS_CD; + if (!UART_ENABLE_MS(port, termios->c_cflag)) { + spin_lock_irq(&port->lock); + pl010_disable_ms(port); + spin_unlock_irq(&port->lock); + } + } } static const char *pl010_type(struct uart_port *port) |