netdev - RE: [PATCH net,stable] qmi_wwan: set DTR for modems in forced USB2 mode

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Date:   Mon, 17 Sep 2018 20:21:39 +0000
From:   Deshu Wen <dwen@...rrawireless.com>
To:     Bjørn Mork <bjorn@...k.no>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Fred Veldini <fred.veldini@...il.com>
Subject: RE: [PATCH net,stable] qmi_wwan: set DTR for modems in forced USB2
 mode

Many thanks Bjørn!

-----Original Message-----
From: Bjørn Mork <bjorn@...k.no> 
Sent: Monday, September 17, 2018 13:00
To: netdev@...r.kernel.org
Cc: linux-usb@...r.kernel.org; Fred Veldini <fred.veldini@...il.com>; Deshu Wen <dwen@...rrawireless.com>; Bjørn Mork <bjorn@...k.no>
Subject: [PATCH net,stable] qmi_wwan: set DTR for modems in forced USB2 mode

Recent firmware revisions have added the ability to force these modems to USB2 mode, hiding their SuperSpeed capabilities from the host.  The driver has been using the SuperSpeed capability, as shown by the bcdUSB field of the device descriptor, to detect the need to enable the DTR quirk.  This method fails when the modems are forced to
USB2 mode by the modem firmware.

Fix by unconditionally enabling the DTR quirk for the affected device IDs.

Reported-by: Fred Veldini <fred.veldini@...il.com>
Reported-by: Deshu Wen <dwen@...rrawireless.com>
Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
 drivers/net/usb/qmi_wwan.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index e3270deecec2..533b6fb8d923 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -1213,13 +1213,13 @@ static const struct usb_device_id products[] = {
 	{QMI_FIXED_INTF(0x1199, 0x9061, 8)},	/* Sierra Wireless Modem */
 	{QMI_FIXED_INTF(0x1199, 0x9063, 8)},	/* Sierra Wireless EM7305 */
 	{QMI_FIXED_INTF(0x1199, 0x9063, 10)},	/* Sierra Wireless EM7305 */
-	{QMI_FIXED_INTF(0x1199, 0x9071, 8)},	/* Sierra Wireless MC74xx */
-	{QMI_FIXED_INTF(0x1199, 0x9071, 10)},	/* Sierra Wireless MC74xx */
-	{QMI_FIXED_INTF(0x1199, 0x9079, 8)},	/* Sierra Wireless EM74xx */
-	{QMI_FIXED_INTF(0x1199, 0x9079, 10)},	/* Sierra Wireless EM74xx */
-	{QMI_FIXED_INTF(0x1199, 0x907b, 8)},	/* Sierra Wireless EM74xx */
-	{QMI_FIXED_INTF(0x1199, 0x907b, 10)},	/* Sierra Wireless EM74xx */
-	{QMI_FIXED_INTF(0x1199, 0x9091, 8)},	/* Sierra Wireless EM7565 */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x9071, 8)},	/* Sierra Wireless MC74xx */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x9071, 10)},/* Sierra Wireless MC74xx */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x9079, 8)},	/* Sierra Wireless EM74xx */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x9079, 10)},/* Sierra Wireless EM74xx */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x907b, 8)},	/* Sierra Wireless EM74xx */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x907b, 10)},/* Sierra Wireless EM74xx */
+	{QMI_QUIRK_SET_DTR(0x1199, 0x9091, 8)},	/* Sierra Wireless EM7565 */
 	{QMI_FIXED_INTF(0x1bbb, 0x011e, 4)},	/* Telekom Speedstick LTE II (Alcatel One Touch L100V LTE) */
 	{QMI_FIXED_INTF(0x1bbb, 0x0203, 2)},	/* Alcatel L800MA */
 	{QMI_FIXED_INTF(0x2357, 0x0201, 4)},	/* TP-LINK HSUPA Modem MA180 */
--
2.11.0