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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-08-31 10:12:14 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-08-31 10:12:14 +0100 |
| commit | b129a8ccd53f74c43e4c83c8e0031a4990040830 (patch) | |
| tree | 4c40afd836be87166d6d014380262f1baa19694f /drivers/serial/amba-pl010.c | |
| parent | 6b39374a27eb4be7e9d82145ae270ba02ea90dc8 (diff) | |
| parent | 194d0710e1a7fe92dcf860ddd31fded8c3103b7a (diff) | |
| download | linux-b129a8ccd53f74c43e4c83c8e0031a4990040830.tar.gz | |
[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/amba-pl010.c')
| -rw-r--r-- | drivers/serial/amba-pl010.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c index 2884b310e54d..978e12437e61 100644 --- a/drivers/serial/amba-pl010.c +++ b/drivers/serial/amba-pl010.c @@ -105,7 +105,7 @@ struct uart_amba_port { unsigned int old_status; }; -static void pl010_stop_tx(struct uart_port *port, unsigned int tty_stop) +static void pl010_stop_tx(struct uart_port *port) { unsigned int cr; @@ -114,7 +114,7 @@ static void pl010_stop_tx(struct uart_port *port, unsigned int tty_stop) UART_PUT_CR(port, cr); } -static void pl010_start_tx(struct uart_port *port, unsigned int tty_start) +static void pl010_start_tx(struct uart_port *port) { unsigned int cr; @@ -219,7 +219,7 @@ static void pl010_tx_chars(struct uart_port *port) return; } if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { - pl010_stop_tx(port, 0); + pl010_stop_tx(port); return; } @@ -236,7 +236,7 @@ static void pl010_tx_chars(struct uart_port *port) uart_write_wakeup(port); if (uart_circ_empty(xmit)) - pl010_stop_tx(port, 0); + pl010_stop_tx(port); } static void pl010_modem_status(struct uart_port *port) |