netdev - [PATCH net-next] qmi_wwan: apply SET_DTR quirk to the SIMCOM shared device ID

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Date:   Fri, 25 May 2018 15:00:20 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     netdev@...r.kernel.org
Cc:     linux-usb@...r.kernel.org,
        Bjørn Mork <bjorn@...k.no>,
        Reinhard Speyerer <rspmn@...or.de>
Subject: [PATCH net-next] qmi_wwan: apply SET_DTR quirk to the SIMCOM shared device ID

SIMCOM are reusing a single device ID for many (all of their?)
different modems, based on different chipsets and firmwares. Newer
Qualcomm chipset generations require setting DTR to wake the QMI
function.  The SIM7600E modem is using such a chipset, making it
fail to work with this driver despite the device ID match.

Fix by unconditionally enabling the SET_DTR quirk for all SIMCOM
modems using this specific device ID.  This is similar to what
we already have done for another case of device IDs recycled over
multiple chipset generations: 14cf4a771b30 ("drivers: net: usb:
qmi_wwan: add QMI_QUIRK_SET_DTR for Telit PID 0x1201")

Initial testing on an older SIM7100 modem shows no immediate side
effects.

Reported-by: Sebastian Sjoholm <sebastian.sjoholm@...il.com>
Cc: Reinhard Speyerer <rspmn@...or.de>
Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
I propose this for net-next for now to get some extra testing
exposure before going into stable.  I'll send a separate request
for stable backport as soon as I'm satisfied that there are no
hidden issues with some specific modem.

Bjørn 

 drivers/net/usb/qmi_wwan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 42565dd33aa6..148e78f8b48c 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -1248,7 +1248,7 @@ static const struct usb_device_id products[] = {
 	{QMI_FIXED_INTF(0x03f0, 0x4e1d, 8)},	/* HP lt4111 LTE/EV-DO/HSPA+ Gobi 4G Module */
 	{QMI_FIXED_INTF(0x03f0, 0x9d1d, 1)},	/* HP lt4120 Snapdragon X5 LTE */
 	{QMI_FIXED_INTF(0x22de, 0x9061, 3)},	/* WeTelecom WPD-600N */
-	{QMI_FIXED_INTF(0x1e0e, 0x9001, 5)},	/* SIMCom 7230E */
+	{QMI_QUIRK_SET_DTR(0x1e0e, 0x9001, 5)},	/* SIMCom 7100E, 7230E, 7600E ++ */
 	{QMI_QUIRK_SET_DTR(0x2c7c, 0x0125, 4)},	/* Quectel EC25, EC20 R2.0  Mini PCIe */
 	{QMI_QUIRK_SET_DTR(0x2c7c, 0x0121, 4)},	/* Quectel EC21 Mini PCIe */
 	{QMI_FIXED_INTF(0x2c7c, 0x0296, 4)},	/* Quectel BG96 */
-- 
2.11.0