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authorDmitry Fink <finik@ti.com>2013-07-08 13:04:44 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-26 15:55:44 -0700
commitc4415084218c68c5ee2fc583431e89a78d896b19 (patch)
treeac30d4c6df6236f77142713a0b7ec091a4e5ae0f /drivers/tty/serial/omap-serial.c
parentf64ffda60e2c9b69ff2125e90cfca234b2eece2b (diff)
downloadop-kernel-dev-c4415084218c68c5ee2fc583431e89a78d896b19.zip
op-kernel-dev-c4415084218c68c5ee2fc583431e89a78d896b19.tar.gz
OMAP: UART: Keep the TX fifo full when possible
Current logic results in interrupt storm since the fifo is constantly below the threshold level. Change the logic to fill all the available spaces in the fifo as long as we have data to minimize the possibilty of underflow and elimiate excessive interrupts. Signed-off-by: Dmitry Fink <finik@ti.com> Signed-off-by: Alexander Savchenko <oleksandr.savchenko@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/omap-serial.c')
-rw-r--r--drivers/tty/serial/omap-serial.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 33c758e..9271a1d 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -315,7 +315,8 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
serial_omap_stop_tx(&up->port);
return;
}
- count = up->port.fifosize / 4;
+ count = up->port.fifosize -
+ (serial_in(up, UART_OMAP_TXFIFO_LVL) & 0xFF);
do {
serial_out(up, UART_TX, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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