Commit 54dc5792 authored Nov 01, 2013 by Greg Kroah-Hartman

Revert "USB: pl2303: restrict the divisor based baud rate encoding method to the "HX" chip type"



This reverts commit b8bdad60.

Revert all of the pl2303 changes that went into 3.12-rc1 and -rc2 as
they cause regressions on some versions of the chip.  This will all be
revisited for later kernel versions when we can figure out how to handle
this in a way that does not break working devices.

Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Frank Schäfer <fschaefer.oss@googlemail.com>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 1796a228

drivers/usb/serial/pl2303.c

+1 −5

Original line number	Diff line number	Diff line
		@@ -305,14 +305,10 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
		if (spriv->type != HX)
		baud = min_t(int, baud, 1228800);

		if (spriv->type != HX \|\| baud <= 115200) {
		/* Direct (standard) baud rate encoding method */
		if (baud <= 115200) {
		put_unaligned_le32(baud, buf);
		} else {
		/*
		* NOTE: it's not clear if the type_0/1 chips
		* support this method
		*
		* Apparently the formula for higher speeds is:
		* baudrate = 12M * 32 / (2^buf[1]) / buf[0]
		*/