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Commit 29cf1b72 authored by Frank Schaefer's avatar Frank Schaefer Committed by Greg Kroah-Hartman
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USB-serial: pl2303: use 1.5 instead of 2 stop bits with 5 data bits 



This is how "real" UARTs (e.g. 16550) work and AFAIK what RS232 specifies, too.
Make the driver more compliant.

Signed-off-by: default avatarFrank Schaefer <schaefer.frank@gmx.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 6dd81b45

drivers/usb/serial/pl2303.c

+10 −2
Original line number Diff line number Diff line
@@ -622,8 +622,16 @@ static void pl2303_set_termios(struct tty_struct *tty, 
	/* For reference buf[4]=1 is 1.5 stop bits */

	/* For reference buf[4]=2 is 2 stop bits */

	if (cflag & CSTOPB) {

		/* NOTE: Comply with "real" UARTs / RS232:

		 *       use 1.5 instead of 2 stop bits with 5 data bits

		 */

		if ((cflag & CSIZE) == CS5) {

			buf[4] = 1;

			dbg("%s - stop bits = 1.5", __func__);

		} else {

			buf[4] = 2;

			dbg("%s - stop bits = 2", __func__);

		}

	} else {

		buf[4] = 0;

		dbg("%s - stop bits = 1", __func__);