From 5ee4c8368e70c65db0a91f7dddb7f2b46de31c87 Mon Sep 17 00:00:00 2001 From: P33M 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(-) diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c index c86a19e..23a9291 100644 --- 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, void *urb_handle, uint32_t * hub_addr, 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; -- 2.7.4