On Fri, 2013-03-01 at 22:57 +0100, Daniel Mack wrote:
> Hi Afzal, everyone,
>
> On 03.11.2012 08:33, Mohammed, Afzal wrote:
> > * Daniel Mack, November 03, 2012 1:06 AM:
> >
> >> I'm testing these patches with an AM33xx board that has the first musb
> >> port wired to an USB type A plug, but it doesn't yet work for me.
> >
> >> So there is no host interface registered. I'm unsure on how to fix this,
> >> and I didn't get an answer yet to that question when I asked Felipe
> >> about how interface drivers like dsps are supposed to act in order to
> >> get host mode back after the recent musb cleanups.
> >
> >> What type of hardware do you test this with? Does host mode work for you?
> >
> > To add to those details mentioned by Ravi,
> >
> > This was tested on Beagle Bone with USB0 as usb-ethernet.
> >
> > For purely Kernel part, this series is sufficient (along with
> > dependency mentioned in cover letter), considering
> > the fact that dt node is strictly not a part of Kernel.
> >
> > To test this series, node for usbss should be present in dt.
> > Example in dt documentation can be pasted onto dtsi file
> > to get USB0 working.
>
> I have to pick up this old thread because I'm still having trouble
> understanding how the AM335x musb driver is meant to be used as HCD.
>
> I used to have it working based on 3.7 with a terrible hack that reverts
> a couple of old commits partly. Now I started over with a fresh setup
> based on Linus' current soon-to-be 3.9-rc tip, actually hoping that the
> issues are solved.
>
> On my board, the USB is purely used as host interface, with a type B
> plug soldered. In the DT, I'm using the following sniplet in accordance
> to the documentation of the bindings:
>
> usb_otg_hs: usb@47400000 {
> compatible = "ti,musb-am33xx";
> reg = <0x47400000 0x1000 /* usbss */
> 0x47401000 0x800 /* musb instance 0 */
> 0x47401800 0x800>; /* musb instance 1 */
> interrupt-parent = <&intc>;
> interrupts = <17 /* usbss */
> 18 /* musb instance 0 */
> 19>; /* musb instance 1 */
> multipoint = <1>;
> num-eps = <16>;
> ram-bits = <12>;
> port0-mode = <3>;
> port1-mode = <3>;
> power = <250>;
> ti,hwmods = "usb_otg_hs";
> };
>
> The relevant config options are
>
> CONFIG_USB_MUSB_HDRC=y
> # CONFIG_USB_MUSB_TUSB6010 is not set
> # CONFIG_USB_MUSB_OMAP2PLUS is not set
> # CONFIG_USB_MUSB_AM35X is not set
> CONFIG_USB_MUSB_DSPS=y
> CONFIG_MUSB_PIO_ONLY=y
> CONFIG_USB_GADGET=y
> CONFIG_USB_GADGET_DEBUG=y
> CONFIG_USB_GADGET_DEBUG_FILES=y
> CONFIG_USB_GADGET_DEBUG_FS=y
> CONFIG_USB_GADGET_VBUS_DRAW=2
> CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS=2
> CONFIG_USB_GADGET_MUSB_HDRC=y
> # CONFIG_USB_GADGETFS is not set
> # CONFIG_USB_MIDI_GADGET is not set
> CONFIG_USB_ZERO=m
>
> At boot time, I only see the following message:
>
> [ 1.534776] musb-hdrc: version 6.0, ?dma?, otg (peripheral+host)
>
> And when g_zero.ko is loaded, I get:
>
> [ 12.137023] udc musb-hdrc.0.auto: registering UDC driver [zero]
> [ 12.196906] gadget: adding 'source/sink'/cec4e840 to config
> 'source/sink'/bf00d544
> [ 12.205800] gadget: dual speed source/sink: IN/ep1in, OUT/ep1out,
> ISO-IN/ep13, ISO-OUT/ep14
> [ 12.215862] gadget: adding 'loopback'/cec4e7c0 to config
> 'loopback'/bf00d5b8
> [ 12.224321] gadget: dual speed loopback: IN/ep1in, OUT/ep1out
> [ 12.231323] gadget: Gadget Zero, version: Cinco de Mayo 2008
> [ 12.238164] gadget: zero ready
> [ 12.242250] musb-hdrc musb-hdrc.0.auto: MUSB HDRC host driver
> [ 12.249111] musb-hdrc musb-hdrc.0.auto: new USB bus registered,
> assigned bus number 1
> [ 12.258151] musb-hdrc musb-hdrc.0.auto: supports USB remote wakeup
> [ 12.265507] usb usb1: default language 0x0409
> [ 12.271007] usb usb1: udev 1, busnum 1, minor = 0
> [ 12.276699] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
> [ 12.284632] usb usb1: New USB device strings: Mfr=3, Product=2,
> SerialNumber=1
> [ 12.292992] usb usb1: Product: MUSB HDRC host driver
> [ 12.298959] usb usb1: Manufacturer: Linux 3.8.0-10238-gbfbdcec-dirty
> musb-hcd
> [ 12.307166] usb usb1: SerialNumber: musb-hdrc.0.auto
> [ 12.323645] usb usb1: no of_node; not parsing pinctrl DT
> [ 12.330172] usb usb1: usb_probe_device
> [ 12.335181] usb usb1: configuration #1 chosen from 1 choice
> [ 12.342090] usb usb1: adding 1-0:1.0 (config #1, interface 0)
> [ 12.355237] hub 1-0:1.0: no of_node; not parsing pinctrl DT
> [ 12.361988] hub 1-0:1.0: usb_probe_interface
> [ 12.367497] hub 1-0:1.0: usb_probe_interface - got id
> [ 12.373774] hub 1-0:1.0: USB hub found
> [ 12.378631] hub 1-0:1.0: 1 port detected
> [ 12.383515] hub 1-0:1.0: standalone hub
> [ 12.388330] hub 1-0:1.0: individual port power switching
> [ 12.394599] hub 1-0:1.0: no over-current protection
> [ 12.400497] hub 1-0:1.0: Single TT
> [ 12.404770] hub 1-0:1.0: TT requires at most 8 FS bit times (666 ns)
> [ 12.412203] hub 1-0:1.0: power on to power good time: 10ms
> [ 12.418776] hub 1-0:1.0: local power source is good
> [ 12.424812] hub 1-0:1.0: enabling power on all ports
> [ 12.527985] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000
> [ 12.533836] hub 1-0:1.0: hub_suspend
> [ 12.537634] usb usb1: bus auto-suspend, wakeup 1
>
> ... but lsusb only shows the root hub, not the device which is connected
> to the plug.
>
> Also, when statically compiled into the kernel, the zero gadget driver
> fails initialization with error code -2, but that's probably a whole
> different story. Eventually, what I need is USB host support without
> loading any module, as I boot the rootfs from USB under some circumstances.
>
> I'm not sure what I'm missing here. Is there anything that needs extra
> configuration to get this going? Is it worth debugging this deeper, or
> is anyone else facing the same problem?
For 3.8 I use the following hack on beaglebone:
https://github.com/beagleboard/kernel/blob/3.8/patches/usb/0009-MUSB-Hack-around-to-make-host-port-to-work.patch
It's only a partial solution but better than nothing :)
regards,
Koen
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