linux-kernel - [PATCH v2] usb: serial: option: Fix the lackage for Quectel EG95 LTE modem support

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Message-ID: <20200902110301.21936-1-william.sung@advantech.com.tw>
Date:   Wed, 2 Sep 2020 19:03:01 +0800
From:   William Sung <william.sung@...antech.com.tw>
To:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        AceLan Kao <acelan.kao@...onical.com>,
        Campion Kang <campion.kang@...antech.com.tw>,
        William Sung <william.sung@...antech.com.tw>
Subject: [PATCH v2] usb: serial: option: Fix the lackage for Quectel EG95 LTE modem support

* Add reset-resume callback for resetting USB devices after MCU exits
from suspend/sleep mode.

* Add zero packet support

Fixes: da6902e5b6db ("USB: serial: option: add Quectel EG95 LTE modem"

Signed-off-by: William Sung <william.sung@...antech.com.tw>
---

 v2: * Add ZLP support
     * Remove redundant code for reserving interface number 4

 drivers/usb/serial/option.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 89b3192af326..ba4dc67dab2f 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -1099,7 +1099,7 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EC25),
 	  .driver_info = RSVD(4) },
 	{ USB_DEVICE(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EG95),
-	  .driver_info = RSVD(4) },
+	  .driver_info = RSVD(4) | ZLP },
 	{ USB_DEVICE(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_BG96),
 	  .driver_info = RSVD(4) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EP06, 0xff, 0xff, 0xff),
@@ -2069,6 +2069,7 @@ static struct usb_serial_driver option_1port_device = {
 #ifdef CONFIG_PM
 	.suspend           = usb_wwan_suspend,
 	.resume            = usb_wwan_resume,
+	.reset_resume      = usb_wwan_resume,
 #endif
 };
 
-- 
2.17.1