On Mon, Jun 18, 2018 at 7:56 PM, Andrew Thomas andrew.thomas@oracle.com wrote:
This bug is the combination of dwc2 USB controller and lan78xx USB ethernet controller, which is the combination in use on the Raspberry Pi Model 3 B+.
When the host attempts to receive a packet, but a packet has not arrived, the lan78xx controller responds by setting BIR (Bulk-In Empty Response) to NAK. Unfortunately, this hangs the USB controller and requires the USB controller to be reset.
The fix proposed is to have the lan78xx controller respond by setting BIR to ZLP.
Signed-off-by: Andrew Thomas andrew.thomas@oracle.com
Tested-by: Peter Robinson pbrobinson@gmail.com
Tested on the RPi 3B+ and certainly improves this situation a number of Fedora users have seen.
drivers/usb/eth/lan78xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/eth/lan78xx.c b/drivers/usb/eth/lan78xx.c index c5ff379..e8ee665 100644 --- a/drivers/usb/eth/lan78xx.c +++ b/drivers/usb/eth/lan78xx.c @@ -296,7 +296,7 @@ static int lan78xx_basic_reset(struct usb_device *udev, ret = lan7x_read_reg(udev, LAN78XX_USB_CFG0, &val); if (ret) return ret;
val |= LAN78XX_USB_CFG0_BIR;
val &= ~LAN78XX_USB_CFG0_BIR; return lan7x_write_reg(udev, LAN78XX_USB_CFG0, val);}
-- 1.8.3.1
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