From 979d9cbe75b922ab1695b8ad5576115774f72e62 Mon Sep 17 00:00:00 2001

From: Johan Hovold <johan@kernel.org>

Date: Mon, 11 Jan 2021 18:00:19 +0100

Subject: [PATCH] USB: serial: pl2303: fix line-speed handling on newer chips

Git-commit: 979d9cbe75b922ab1695b8ad5576115774f72e62

Patch-mainline: v5.12-rc1

References: bsc#1186320

The latest chip family (HXN) apparently does not support setting the

line speed using divisors and instead needs to use the direct encoding

scheme for all rates.

This specifically enables 50, 110, 134, 200 bps and other rates not

supported by the original chip type.

Fixes: ebd09f1cd417 ("USB: serial: pl2303: add support for PL2303HXN")

Cc: stable@vger.kernel.org      # 5.5

Cc: Charles Yeh <charlesyeh522@gmail.com>

Signed-off-by: Johan Hovold <johan@kernel.org>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 drivers/usb/serial/pl2303.c | 8 +++++++-

 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c

index be8067017eaa..29dda60e3bcd 100644

--- a/drivers/usb/serial/pl2303.c

+++ b/drivers/usb/serial/pl2303.c

@@ -183,6 +183,7 @@ struct pl2303_type_data {

 	speed_t max_baud_rate;

 	unsigned long quirks;

 	unsigned int no_autoxonxoff:1;

+	unsigned int no_divisors:1;

 };

 struct pl2303_serial_private {

@@ -209,6 +210,7 @@ static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {

 	},

 	[TYPE_HXN] = {

 		.max_baud_rate		= 12000000,

+		.no_divisors		= true,

 	},

 };

@@ -571,8 +573,12 @@ static void pl2303_encode_baud_rate(struct tty_struct *tty,

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

 	/*

 	 * Use direct method for supported baud rates, otherwise use divisors.

+	 * Newer chip types do not support divisor encoding.

 	 */

-	baud_sup = pl2303_get_supported_baud_rate(baud);

+	if (spriv->type->no_divisors)

+		baud_sup = baud;

+	else

+		baud_sup = pl2303_get_supported_baud_rate(baud);

 	if (baud == baud_sup)

 		baud = pl2303_encode_baud_rate_direct(buf, baud);

-- 

2.26.2