From 348f9bb31c56909f9098a598b6ecdc94a560816e Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sun, 25 Jan 2015 14:44:53 -0500 Subject: serial: omap: Fix RTS handling The OMAP UART ignores MCR[1] (ie., RTS) when in autoRTS mode. 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. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/omap-serial.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) (limited to 'drivers/tty') diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 6129fe5..10256fa 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -681,7 +681,7 @@ static unsigned int serial_omap_get_mctrl(struct uart_port *port) static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) { struct uart_omap_port *up = to_uart_omap_port(port); - unsigned char mcr = 0, old_mcr; + unsigned char mcr = 0, old_mcr, lcr; dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->port.line); if (mctrl & TIOCM_RTS) @@ -701,6 +701,17 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) UART_MCR_DTR | UART_MCR_RTS); up->mcr = old_mcr | mcr; serial_out(up, UART_MCR, up->mcr); + + /* Turn off autoRTS if RTS is lowered; restore autoRTS if RTS raised */ + lcr = serial_in(up, UART_LCR); + serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B); + if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS)) + up->efr |= UART_EFR_RTS; + else + up->efr &= UART_EFR_RTS; + serial_out(up, UART_EFR, up->efr); + serial_out(up, UART_LCR, lcr); + pm_runtime_mark_last_busy(up->dev); pm_runtime_put_autosuspend(up->dev); } @@ -756,8 +767,6 @@ static int serial_omap_startup(struct uart_port *port) * (they will be reenabled in set_termios()) */ serial_omap_clear_fifos(up); - /* For Hardware flow control */ - serial_out(up, UART_MCR, UART_MCR_RTS); /* * Clear the interrupt registers. @@ -1056,12 +1065,9 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios, up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF); if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) { - /* Enable AUTORTS and AUTOCTS */ + /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */ up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS; - up->efr |= UART_EFR_CTS | UART_EFR_RTS; - - /* Ensure MCR RTS is asserted */ - up->mcr |= UART_MCR_RTS; + up->efr |= UART_EFR_CTS; } else { /* Disable AUTORTS and AUTOCTS */ up->efr &= ~(UART_EFR_CTS | UART_EFR_RTS); -- cgit v1.1