Re: [Gumstix-users] USB OTG port power issue with webcam

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Does this same patch work for the Host port as well?

When I connect a hub, I see this on the console

root@overo:~# usb 2-2: new high speed USB device using ehci-omap and address 2
usb 2-2: device descriptor read/all, error -71
usb 2-2: new high speed USB device using ehci-omap and address 3
usb 2-2: New USB device found, idVendor=1a40, idProduct=0201
usb 2-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
usb 2-2: Product: USB 2.0 Hub [MTT]
hub 2-2:1.0: USB hub found
hub 2-2:1.0: 7 ports detected

but in dmesg
ehci-omap ehci-omap.0: port 2 high speed
ehci-omap ehci-omap.0: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT
usb 2-2: new high speed USB device using ehci-omap and address 3
ehci-omap ehci-omap.0: port 2 high speed
ehci-omap ehci-omap.0: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT
usb 2-2: default language 0x0409
usb 2-2: udev 3, busnum 2, minor = 130
usb 2-2: New USB device found, idVendor=1a40, idProduct=0201
usb 2-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
usb 2-2: Product: USB 2.0 Hub [MTT]
usb 2-2: uevent
usb 2-2: usb_probe_device
usb 2-2: configuration #1 chosen from 1 choice
usb 2-2: uevent
usb 2-2: adding 2-2:1.0 (config #1, interface 0)
usb 2-2:1.0: uevent
hub 2-2:1.0: usb_probe_interface
hub 2-2:1.0: usb_probe_interface - got id
hub 2-2:1.0: USB hub found
hub 2-2:1.0: 7 ports detected
hub 2-2:1.0: standalone hub
hub 2-2:1.0: ganged power switching
hub 2-2:1.0: individual port over-current protection
hub 2-2:1.0: TT per port
hub 2-2:1.0: TT requires at most 8 FS bit times (666 ns)
hub 2-2:1.0: Port indicators are supported
hub 2-2:1.0: power on to power good time: 100ms
hub 2-2:1.0: local power source is good
hub 2-2:1.0: enabling power on all ports
drivers/usb/core/inode.c: creating file '003'
hub 2-0:1.0: state 7 ports 3 chg 0000 evt 0004
usb 2-2: link qh256-0001/cef36e40 start 1 [1/0 us]
hub 2-2:1.0: state 7 ports 7 chg 0000 evt 0000
hub 2-2:1.0: hub_suspend
usb 2-2: unlink qh256-0001/cef36e40 start 1 [1/0 us]
usb 2-2: usb auto-suspend
hub 2-0:1.0: hub_suspend
usb usb2: bus auto-suspend
ehci-omap ehci-omap.0: suspend root hub

Plugging anything into the hub results in nothing happening. I've
tried devices that if I plug them in directly to the Overo, they work
fine and show up in lsusb, but through the hub, I get nothing.

If this patch applies to the host port as well, how do I recompile the
kernel after I change the c file? Can I just bitbake the console-image
again, or do I have to bitbake the kernel package separately, then the
image again?

Andrew

On Mon, May 10, 2010 at 5:37 AM, Chris Cotton <Cot...@ya...> wrote:
>
> Hi again,
> I have now located the line which needs editing, and done hardware testing
> to confirm that the modification works.
>
> I disconnected the +5V pin of the USB connector from the Gimstix, and
> connected it directly to a 5V 1Amp regulated power supply.  I then tested
> the Gumstix against a CP2103 USB adaptor, which I have a development kit
> for; this allowed me to change the current descriptor in my USB device.
> Sure enough, as soon as I set the descriptor to 'claim' the device needed
> more than 100mA, I got the error you are seeing. (The device actually only
> uses 25mA)
>
> I then altered the file:
> /tmp/work/overo-angstrom-linux-gnueabi/linux-omap3-2.6.32-r51/git/drivers/usb/host/ehci.h
>
> by changing the following line from:
>        /* REVISIT charge pump on TWL4030 can supply up to
>         * 100 mA ... but this value is board-specific, like
>         * "mode", and should be passed to usb_musb_init().
>         */
>        .power          = 50,                   /* up to 100 mA */
>
> to:
>        /* REVISIT charge pump on TWL4030 can supply up to
>         * 100 mA ... but this value is board-specific, like
>         * "mode", and should be passed to usb_musb_init().
>         */
>        .power          = 250,                  /* up to 500 mA */
>
> Rebuilding the kernel, I can confirm that the gumstix now accepts
> connections from high - current devices, hopefully including devices such as
> your camera :)
>
> Please note that if you use the modified kernel on a 'normal' gumstix
> development board, you may end up damaging the twl4030 power supply IC as
> the gumstix won't protect it when you connect a high current device to the
> board!!  The above change is strictly for non-standard / modified hardware
> which can safely supply the required current.
>
> Hope this solves your problem,
> Chris
>
>
> zyperion wrote:
>>
>> So the USB OTG port is supposed to be able to source 100ma as far as I
>> understand and my team and I are trying to use an Overo Fire with the
>> Pinto board to control a UAV helicopter with a stripped down usb webcam.
>> The webcam was hooked up by being soldered on to the miniB end of a USB
>> MiniAB cable with the MiniA end going into the OTG port of the Gumstix. We
>> haven't seen the camera pull more than 40ma or so yet but are having
>> trouble getting it up and running. The gumstix is current using the may
>> 4th build of the desktop image and recognizes a USB device attached and
>> identifies it as an HP webcam but gives a "configuration due to
>> insufficient available bus power" error. To remedy this we were wondering
>> if we could simply bypass the Gumstix and connect the 5V supply pin from
>> the webcam directly to the 5V rail that we're getting off the helicopter's
>> battery that's being used to power the whole system thereby removing the
>> need for the Gumstix to do any sourcing at all. Would this effectively
>> operate the same way a powered usb hub would? We don't really have the
>> option of using a powered hub due to the weight restrictions for the
>> helicopter so we really need to be able to run this single webcam off the
>> OTG port on the Pinto. Anyone have any insight or suggestions?
>>
>
> --
> View this message in context: http://old.nabble.com/USB-OTG-port-power-issue-with-webcam-tp28492360p28510479.html
> Sent from the Gumstix mailing list archive at Nabble.com.
>
>
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