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24 lines
948 B
Diff
24 lines
948 B
Diff
The PinePhone Modems' CDC Ethernet Interface does not respond if RX/TX queue size
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is greater 12 (experimentally determined), the default would be 60, meaning 60
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RX Bulk URBs are sent at once to the device.
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diff --git src/linux/drivers/net/usb/usbnet.c src/linux/drivers/net/usb/usbnet.c
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index 2d14b0d78..d8c566b8c 100644
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--- src/linux/drivers/net/usb/usbnet.c
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+++ src/linux/drivers/net/usb/usbnet.c
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@@ -356,6 +356,14 @@ EXPORT_SYMBOL_GPL(usbnet_skb_return);
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void usbnet_update_max_qlen(struct usbnet *dev)
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{
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enum usb_device_speed speed = dev->udev->speed;
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+ struct usb_device_descriptor *descr = &dev->udev->descriptor;
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+
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+ /* Quectel EG25-G does not respond on queue size > 12 */
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+ if (descr->idVendor == 0x2c7c && descr->idProduct == 0x0125) {
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+ printk("Quectel EG25-G detected limiting TX/RX queue size to 12 (from 60)\n");
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+ dev->rx_qlen = dev->tx_qlen = 12;
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+ return;
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+ }
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if (!dev->rx_urb_size || !dev->hard_mtu)
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goto insanity;
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