4g /5g

hc

2024-08-13 755336cb89d9507a85518c0bbb55ed1db039c2fa

 kernel/drivers/usb/serial/usb_wwan.c
..
..
@@ -480,6 +480,19 @@
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 	if (intfdata->use_zlp && dir == USB_DIR_OUT)
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 		urb->transfer_flags |= URB_ZERO_PACKET;
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+	
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+#if 1 //Added by Quectel for Zero Packet
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+	if (dir == USB_DIR_OUT) {
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+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9090))
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+			urb->transfer_flags |= URB_ZERO_PACKET;
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+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003))
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+			urb->transfer_flags |= URB_ZERO_PACKET;
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+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215))
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+			urb->transfer_flags |= URB_ZERO_PACKET;
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+		if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C))
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+			urb->transfer_flags |= URB_ZERO_PACKET;
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+	}
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+#endif
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 	return urb;
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 }