From f5835c1d0e30c7d0a48aa36e3a353c7d54ace470 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Fri, 21 Aug 2015 20:02:38 +0200 Subject: [PATCH] serial: sh-sci: Improve comments for DMA timeout calculation Reformat, grammar improvements, use "ms" instead of "msec". Signed-off-by: Geert Uytterhoeven Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sh-sci.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 340700a11b15..cfef543df252 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -2015,13 +2015,13 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, #ifdef CONFIG_SERIAL_SH_SCI_DMA /* * Calculate delay for 2 DMA buffers (4 FIFO). - * See serial_core.c::uart_update_timeout(). With 10 - * bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function - * calculates 1 jiffie for the data plus 5 jiffies for the "slop(e)." - * Then below we calculate 5 jiffies (20ms) for 2 DMA buffers (4 FIFO - * sizes), but when performing a faster transfer, value obtained by - * this formula is may not enough. Therefore, if value is smaller than - * 20msec, this sets 20msec as timeout of DMA. + * See serial_core.c::uart_update_timeout(). + * With 10 bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above + * function calculates 1 jiffie for the data plus 5 jiffies for the + * "slop(e)." Then below we calculate 5 jiffies (20ms) for 2 DMA + * buffers (4 FIFO sizes), but when performing a faster transfer, the + * value obtained by this formula is too small. Therefore, if the value + * is smaller than 20ms, use 20ms as the timeout value for DMA. */ if (s->chan_rx) { unsigned int bits; -- 2.25.1