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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-08-31 10:12:14 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-08-31 10:12:14 +0100
commitb129a8ccd53f74c43e4c83c8e0031a4990040830 (patch)
tree4c40afd836be87166d6d014380262f1baa19694f /drivers/serial/21285.c
parent6b39374a27eb4be7e9d82145ae270ba02ea90dc8 (diff)
parent194d0710e1a7fe92dcf860ddd31fded8c3103b7a (diff)
[SERIAL] Clean up and fix tty transmission start/stoping
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>
Diffstat (limited to 'drivers/serial/21285.c')
-rw-r--r--drivers/serial/21285.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/serial/21285.c b/drivers/serial/21285.c
index 0b10169961e..aec39fb261c 100644
--- a/drivers/serial/21285.c
+++ b/drivers/serial/21285.c
@@ -58,8 +58,7 @@ static const char serial21285_name[] = "Footbridge UART";
* int((BAUD_BASE - (baud >> 1)) / baud)
*/
-static void
-serial21285_stop_tx(struct uart_port *port, unsigned int tty_stop)
+static void serial21285_stop_tx(struct uart_port *port)
{
if (tx_enabled(port)) {
disable_irq(IRQ_CONTX);
@@ -67,8 +66,7 @@ serial21285_stop_tx(struct uart_port *port, unsigned int tty_stop)
}
}
-static void
-serial21285_start_tx(struct uart_port *port, unsigned int tty_start)
+static void serial21285_start_tx(struct uart_port *port)
{
if (!tx_enabled(port)) {
enable_irq(IRQ_CONTX);
@@ -148,7 +146,7 @@ static irqreturn_t serial21285_tx_chars(int irq, void *dev_id, struct pt_regs *r
goto out;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- serial21285_stop_tx(port, 0);
+ serial21285_stop_tx(port);
goto out;
}
@@ -164,7 +162,7 @@ static irqreturn_t serial21285_tx_chars(int irq, void *dev_id, struct pt_regs *r
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
- serial21285_stop_tx(port, 0);
+ serial21285_stop_tx(port);
out:
return IRQ_HANDLED;