linux-kernel - [PATCH 5.4 249/340] USB: serial: ftdi_sio: fix FTX sub-integer prescaler

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Message-Id: <20210301161100.548153350@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:13:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vladimir <svv75@...l.ru>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 5.4 249/340] USB: serial: ftdi_sio: fix FTX sub-integer prescaler

From: Johan Hovold <johan@...nel.org>

commit 528222d0c8ce93e435a95cd1e476b60409dd5381 upstream.

The most-significant bit of the sub-integer-prescaler index is set in
the high byte of the baudrate request wIndex also for FTX devices.

This fixes rates like 1152000 which got mapped to 1.2 MBd.

Reported-by: Vladimir <svv75@...l.ru>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=210351
Cc: stable@...r.kernel.org
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/serial/ftdi_sio.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1386,8 +1386,9 @@ static int change_speed(struct tty_struc
 	index_value = get_ftdi_divisor(tty, port);
 	value = (u16)index_value;
 	index = (u16)(index_value >> 16);
-	if ((priv->chip_type == FT2232C) || (priv->chip_type == FT2232H) ||
-		(priv->chip_type == FT4232H) || (priv->chip_type == FT232H)) {
+	if (priv->chip_type == FT2232C || priv->chip_type == FT2232H ||
+			priv->chip_type == FT4232H || priv->chip_type == FT232H ||
+			priv->chip_type == FTX) {
 		/* Probably the BM type needs the MSB of the encoded fractional
 		 * divider also moved like for the chips above. Any infos? */
 		index = (u16)((index << 8) | priv->interface);