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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>
This commit is contained in:
Peter Hurley 2014-11-05 13:11:45 -05:00 committed by Greg Kroah-Hartman
parent d41510ce2f
commit cab68f8954
3 changed files with 42 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/tty/serial/8250/8250_core.c
View File

@ -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);
}
}
}

18
drivers/tty/serial/amba-pl010.c
View File

@ -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)

5
drivers/tty/serial/atmel_serial.c
View File

@ -2065,6 +2065,11 @@ static void atmel_set_ldisc(struct uart_port *port, struct ktermios *termios)
spin_unlock_irq(&port->lock);
} else {
port->flags &= ~UPF_HARDPPS_CD;
if (!UART_ENABLE_MS(port, termios->c_cflag)) {
spin_lock_irq(&port->lock);
atmel_disable_ms(port);
spin_unlock_irq(&port->lock);
}
}
}