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Commit 20b4c787 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: pl2303: add helper function for direct baud-rate encoding 



Add helper function for direct baud-rate encoding.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c82c6d45

drivers/usb/serial/pl2303.c

+15 −7
Original line number Diff line number Diff line
@@ -339,6 +339,18 @@ static speed_t pl2303_get_supported_baud_rate(speed_t baud) 
	return baud;

}



/*

 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to

 *       use 9600 baud.

 */

static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],

								speed_t baud)

{

	put_unaligned_le32(baud, buf);



	return baud;

}



static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],

								speed_t baud)

{
@@ -376,16 +388,12 @@ static void pl2303_encode_baud_rate(struct tty_struct *tty, 


	if (spriv->type->max_baud_rate)

		baud = min_t(speed_t, baud, spriv->type->max_baud_rate);

	/*

	 * Set baud rate to nearest supported value.

	 *

	 * NOTE: If unsupported values are set directly, the PL2303 seems to

	 *       use 9600 baud.

	 */



	/* Set baud rate to nearest supported value. */

	baud = pl2303_get_supported_baud_rate(baud);



	if (baud <= 115200)

		put_unaligned_le32(baud, buf);

		baud = pl2303_encode_baud_rate_direct(buf, baud);

	else

		baud = pl2303_encode_baud_rate_divisor(buf, baud);