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serial: omap_8250: Fix RTS handling 

The OMAP3 UART ignores MCR[1] (ie., UART_MCR_RTS) when in autoRTS
mode (UPF_HARD_FLOW + CRTSCTS). This makes it impossible for either
the serial core or userspace to manually flow control the sender.

Disable autoRTS mode when RTS is lowered and restore the previous
mode when RTS is raised.

Note that the OMAP3 UART provides no mechanism for switching from
autoRTS mode without corrupting incoming data; to access the
necessary register, the line control settings must be set to 8-e-2
and thus any data received during that time will be interpreted with
those settings. This corruption has been observed in practice.

Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-12-30 20:28:15 -05:00 committed by Greg Kroah-Hartman
parent fbf7ebe4d9
commit 4bf4ea9dca
4 changed files with 35 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/tty/serial/8250/8250_core.c
View File

@ -1924,7 +1924,7 @@ static unsigned int serial8250_get_mctrl(struct uart_port *port)
return ret;
}
static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_8250_port *up = up_to_u8250p(port);
unsigned char mcr = 0;
@ -1944,6 +1944,14 @@ static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
serial_port_out(port, UART_MCR, mcr);
}
EXPORT_SYMBOL_GPL(serial8250_do_set_mctrl);
static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
if (port->set_mctrl)
return port->set_mctrl(port, mctrl);
return serial8250_do_set_mctrl(port, mctrl);
}
static void serial8250_break_ctl(struct uart_port *port, int break_state)
{
@ -3605,6 +3613,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
/* Possibly override set_termios call */
if (up->port.set_termios)
uart->port.set_termios = up->port.set_termios;
if (up->port.set_mctrl)
uart->port.set_mctrl = up->port.set_mctrl;
if (up->port.startup)
uart->port.startup = up->port.startup;
if (up->port.shutdown)

25
drivers/tty/serial/8250/8250_omap.c
View File

@ -106,6 +106,27 @@ static u32 uart_read(struct uart_8250_port *up, u32 reg)
return readl(up->port.membase + (reg << up->port.regshift));
}
static void omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_8250_port *up = up_to_u8250p(port);
struct omap8250_priv *priv = up->port.private_data;
u8 lcr;
serial8250_do_set_mctrl(port, mctrl);
/*
* Turn off autoRTS if RTS is lowered and restore autoRTS setting
* if RTS is raised
*/
lcr = serial_in(up, UART_LCR);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
if (mctrl & TIOCM_RTS)
serial_out(up, UART_EFR, priv->efr);
else
serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
serial_out(up, UART_LCR, lcr);
}
/*
* Work Around for Errata i202 (2430, 3430, 3630, 4430 and 4460)
* The access to uart register after MDR1 Access
@ -400,9 +421,6 @@ static void omap_8250_set_termios(struct uart_port *port,
if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
/* Enable AUTORTS and AUTOCTS */
priv->efr |= UART_EFR_CTS | UART_EFR_RTS;
/* Ensure MCR RTS is asserted */
up->mcr |= UART_MCR_RTS;
} else if (up->port.flags & UPF_SOFT_FLOW) {
/*
* IXON Flag:
@ -1007,6 +1025,7 @@ static int omap8250_probe(struct platform_device *pdev)
up.capabilities |= UART_CAP_RPM;
#endif
up.port.set_termios = omap_8250_set_termios;
up.port.set_mctrl = omap8250_set_mctrl;
up.port.pm = omap_8250_pm;
up.port.startup = omap_8250_startup;
up.port.shutdown = omap_8250_shutdown;

1
include/linux/serial_8250.h
View File

@ -126,6 +126,7 @@ extern int serial8250_do_startup(struct uart_port *port);
extern void serial8250_do_shutdown(struct uart_port *port);
extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate);
extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
extern int fsl8250_handle_irq(struct uart_port *port);
int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);

1
include/linux/serial_core.h
View File

@ -123,6 +123,7 @@ struct uart_port {
void (*set_termios)(struct uart_port *,
struct ktermios *new,
struct ktermios *old);
void (*set_mctrl)(struct uart_port *, unsigned int);
int (*startup)(struct uart_port *port);
void (*shutdown)(struct uart_port *port);
void (*throttle)(struct uart_port *port);