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[SERIAL] Clean up and fix tty transmission start/stoping

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The start_tx and stop_tx methods were passed a flag to indicate
whether the start/stop was from the tty start/stop callbacks, and
some drivers used this flag to decide whether to ask the UART to
immediately stop transmission (where the UART supports such a
feature.)

There are other cases when we wish this to occur - when CTS is
lowered, or if we change from soft to hard flow control and CTS
is inactive.  In these cases, this flag was false, and we would
allow the transmitter to drain before stopping.

There is really only one case where we want to let the transmitter
drain before disabling, and that's when we run out of characters
to send.

Hence, re-jig the start_tx and stop_tx methods to eliminate this
flag, and introduce new functions for the special "disable and
allow transmitter to drain" case.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2005-08-31 10:12:14 +01:00
committed by Russell King
parent 6b39374a27 194d0710e1
commit b129a8ccd5
34 changed files with 149 additions and 158 deletions
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6
drivers/serial/ioc4_serial.c
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@@ -2373,10 +2373,9 @@ static unsigned int ic4_tx_empty(struct uart_port *the_port)
/**
* ic4_stop_tx - stop the transmitter
* @port: Port to operate on
* @tty_stop: Set to 1 if called via uart_stop
*
*/
static void ic4_stop_tx(struct uart_port *the_port, unsigned int tty_stop)
static void ic4_stop_tx(struct uart_port *the_port)
{
}
@@ -2471,10 +2470,9 @@ static unsigned int ic4_get_mctrl(struct uart_port *the_port)
/**
* ic4_start_tx - Start transmitter, flush any output
* @port: Port to operate on
* @tty_stop: Set to 1 if called via uart_start
*
*/
static void ic4_start_tx(struct uart_port *the_port, unsigned int tty_stop)
static void ic4_start_tx(struct uart_port *the_port)
{
struct ioc4_port *port = get_ioc4_port(the_port);
unsigned long flags;