From 6e56da00afdf11416045213552514d10bab845cc Mon Sep 17 00:00:00 2001
From: P33M <p33m@github.com>
Date: Wed, 16 Jan 2019 10:17:52 +0000
Subject: [PATCH] dwc_otg: fix bug with port_addr assignment for
single-TT hubs
See https://github.com/raspberrypi/linux/issues/2734
The "Hub Port" field in the split transaction packet was always set
to 1 for single-TT hubs. The majority of single-TT hub products
apparently ignore this field and broadcast to all downstream enabled
ports, which masked the issue. A subset of hub devices apparently
need the port number to be exact or split transactions will fail.
---
drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
@@ -232,7 +232,7 @@ static int _hub_info(dwc_otg_hcd_t * hcd
else
*hub_addr = urb->dev->tt->hub->devnum;
}
- *port_addr = urb->dev->tt->multi ? urb->dev->ttport : 1;
+ *port_addr = urb->dev->ttport;
} else {
*hub_addr = 0;
*port_addr = urb->dev->ttport;