diff options
| author |   Peter Hurley <peter@hurleysoftware.com> | 2014-11-05 13:11:45 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-06 14:57:27 -0800 |
| commit | cab68f89546ba5a04bf28aaeaca841d4ccc2fd52 (patch) | |
| tree | 77aa632377f99150cf70619a389a3de2790f2d86 /drivers/tty/serial/8250 | |
| parent | serial: Take uart port lock for direct *_enable_ms() (diff) | |
| download | linux-dev-cab68f89546ba5a04bf28aaeaca841d4ccc2fd52.tar.xz linux-dev-cab68f89546ba5a04bf28aaeaca841d4ccc2fd52.zip | |
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/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_core.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index f0f35e782bc3..25eb8e93615d 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1402,6 +1402,19 @@ static void serial8250_stop_rx(struct uart_port *port) serial8250_rpm_put(up); } +static void serial8250_disable_ms(struct uart_port *port) +{ + struct uart_8250_port *up = + container_of(port, struct uart_8250_port, port); + + /* no MSR capabilities */ + if (up->bugs & UART_BUG_NOMSR) + return; + + up->ier &= ~UART_IER_MSI; + serial_port_out(port, UART_IER, up->ier); +} + static void serial8250_enable_ms(struct uart_port *port) { struct uart_8250_port *up = up_to_u8250p(port); @@ -2616,8 +2629,14 @@ serial8250_set_ldisc(struct uart_port *port, struct ktermios *termios) spin_lock_irq(&port->lock); serial8250_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); + serial8250_disable_ms(port); + spin_unlock_irq(&port->lock); + } + } } |