u-boot/drivers/usb
Stefan Brüns ac3abf0b7d usb: musb: Fix hub port setting for SPLIT transactions
The ifdef'ed Linux kernel code uses the 1 based port number, whereas U-Boot
puts a 0 based port number into the register. The reason the 0 based port
number apparently works can probably be taken from the USB 2.0 spec:

8.4.2.2 Start-Split Transaction Token
... The host must correctly set the port field for single and multiple TT
hub implementations. A single TT hub implementation *may ignore* the port
field.

Actually, as far as I understand, a multi TT hub defaults to single TT
(bAlternateSetting: 0) until switched via SetInterface, so even "port 42"
would work.

The change was verified by hardcoding the port number to a wrong value,
SPLIT transactions kept working (although using a DWC2 instead of MUSB).
Tested hubs are the RPi onboard SMC9514 and an external "05e3:0608
Genesys Logic, Inc. USB-2.0 4-Port HUB". The former is a multi TT hub,
the latter single TT only.

Addendum: Tested on sunxi/MUSB by Hans de Goede

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
2015-12-31 16:16:30 +01:00
..
dwc3 usb: dwc3: fix build warnings 2015-12-07 00:14:59 +01:00
emul usb: sandbox: Add a USB emulation driver 2015-11-19 20:27:52 -07:00
eth driver: usb: Fix pointer conversion warnings for hikey 2015-11-12 15:59:00 -05:00
gadget usb: s3c-otg: Rename usb/s3c_udc.h to usb/dwc2_udc.h 2015-12-17 21:54:41 +01:00
host usb: Move determination of TT hub address/port into separate function 2015-12-31 16:16:29 +01:00
musb usb: musb-new: CONFIG_MUSB prefix replacement with CONFIG_USB_MUSB 2015-08-05 17:20:34 +02:00
musb-new usb: musb: Fix hub port setting for SPLIT transactions 2015-12-31 16:16:30 +01:00
phy usb: xhci: omap: Remove common dwc3 drv functions calls 2015-07-22 08:55:44 +02:00
ulpi drivers: usb: convert makefiles to Kbuild style 2013-10-31 13:25:38 -04:00
Kconfig usb: musb-new: Kconfig support for USB_MUSB_HOST and USB_MUSB_GADGET 2015-08-05 17:20:34 +02:00