Re: AM3517 usb host issue

[Ben Dooks <ben.dooks@codethink.co.uk>]

On 22/05/15 23:13, Ben Dooks wrote:
> On 22/05/15 16:50, Felipe Balbi wrote:
>> Hi,
> 
>> On Fri, May 22, 2015 at 11:04:33AM +0300, Ben Dooks wrote:
>>> I am trying to get the full-speed USB host working on an custom
>>> AM3517 device with the 3.18.12 kernel. The hardware works (a
>>> 2.6.37 kernel has been used for testing).
>>>
>>> Does anyone have any experience of 3.18 (or similarly recent
>>> kernel on an AM3517 system) or have any pointers as where to
>>> start debugging? The ti-linux-3.14.y does not have any patches
>>> that aren't applied to the usb on 3.18.13.
>>>
>>> The cpu port 1 is connected by a TI TUSB1106 usb transceiver that
>>> is directly connected to a full-speed hub (TI USB2046) hub so the
>>> OHCI driver is the only one in use.
>>>
>>> Note, the ohci-omap3 is loaded as a module as this is how their
>>> user application expects to be able to shut down usb when it does
>>> not need it.
>>>
>>> The device tree configuration for the usb host:
> 
>> and what exactly doesn't work ? That old OHCI driver hasn't been
>> touched in years, it's no surprise that it stopped working :-(
> 
>> Anyway, what exactly doesn't work ? No device enumerates ? Do you
>> get any IRQs by plugging a new device in ?
> 
> I will check the interrupts when I get back into the office.
> 
> There is only one device (the hub) which isn't enumerating and is
> hard-wired on the board.
> 
>>>> &usbhshost { status = "okay";	/* just in case it is started
>>>> disabled */
>>>>
>>>> port1-mode = "ohci-phy-6pin-dpdm"; };
>>>>
>>>> &usbhsohci { status = "okay"; };
>>>>
>>>> &usbhsehci { status = "disabled";	/* no ehci on board */ };
>>>
>>>
>>> The usb from the logs is as follows. Some extra debugging has
>>> been added to verify the device-tree settings:
>>>
>>>> [    0.000000] AM3517 ES1.1 (l2cache sgx neon)
>>>>
>>>>
>>>> [    0.869706] usbcore: registered new interface driver usbfs
>>>>  [    0.874270] usbcore: registered new interface driver hub
>>>>  [    0.878592] usbcore: registered new device driver usb
>>>>  [    1.223199] usbhs_tll 48062000.usbhstll: starting TI HSUSB
>>>> TLL Controller [    1.273000] usbhs_omap 48064000.usbhshost:
>>>> ports 0 [    1.278291] usbhs_omap 48064000.usbhshost: port 0:
>>>> ohci-phy-6pin-dpdm [    1.284476] usbhs_omap
>>>> 48064000.usbhshost: port0-mode: ohci-phy-6pin-dpdm ->5 [
>>>> 1.288689] usbhs_tll 48062000.usbhstll: omap_tll_init()
>>>>  [    1.293628] usbhs_omap 48064000.usbhshost:
>>>> usbhs_runtime_resume [    1.298434] usbhs_omap
>>>> 48064000.usbhshost: sysconfig 0x00001009 [    1.302730]
>>>> usbhs_tll 48062000.usbhstll: omap_tll_enable()
>>>>  [    1.307668] usbhs_omap 48064000.usbhshost:
>>>> usbhs_runtime_suspend [    1.310142] stopping usb controller
>>>>  [    1.419910] usbhs_tll 48062000.usbhstll: omap_tll_disable()
>>>>  [    1.423547] usbhs_omap 48064000.usbhshost: 3 ports
>>>>  [    1.429065] usbhs_omap 48064000.usbhshost: starting TI
>>>> HSUSB Controller [    1.433831] usbhs_omap 48064000.usbhshost:
>>>> usbhs_runtime_resume [    1.438625] usbhs_omap
>>>> 48064000.usbhshost: sysconfig 0x00001009 [    1.442921]
>>>> usbhs_tll 48062000.usbhstll: omap_tll_enable()
>>>>  [    1.448548] usbhs_omap 48064000.usbhshost:
>>>> omap_usbhs_rev1_hostconfig => [    1.455034] usbhs_omap
>>>> 48064000.usbhshost: UHH setup done, uhh_hostconfig=80d [
>>>> 1.459918] usbhs_omap 48064000.usbhshost: usbhs_runtime_suspend
>>>>  [    1.462337] stopping usb controller
>>>>  [    1.569905] usbhs_tll 48062000.usbhstll: omap_tll_disable()
>>>>  [    1.575408] usbhs_omap 48064000.usbhshost: populating usb
>>>> sub nodes....
>>>>
>>>> [   77.609168] usbhs_omap 48064000.usbhshost:
>>>> usbhs_runtime_resume [   77.613927] usbhs_omap
>>>> 48064000.usbhshost: sysconfig 0x00001009 [   77.618374]
>>>> usbhs_tll 48062000.usbhstll: omap_tll_enable()
>>>>  [   77.802694] usb usb1: New USB device found, idVendor=1d6b,
>>>> idProduct=0001 [   77.816003] usb usb1: New USB device strings:
>>>> Mfr=3, Product=2, SerialNumber1 [   77.827391] usb usb1:
>>>> Product: OHCI Host Controller [   77.838674] usb usb1:
>>>> Manufacturer: Linux 3.18.13-00203-ga3c52be-dirty ohci_d [
>>>> 77.849913] usb usb1: SerialNumber: 48064400.ohci
>>>>
> 
>> OK, so this is roothub, what happens when a device is plugged to
>> the other end ? Is VBUS charged ? We didn't even enumerate
>> TUSB2046, did you look at its datasheet
>> (http://www.ti.com/lit/ds/symlink/tusb2046b.pdf) ? What is the
>> state of RESETn pin ? Perhaps that's tied to a GPIO and the old TI
>> kernel toggles that ? Anything interesting from usbmon ?
> 
> I've gone through the schematics and verified the hub's reset line
> is connected where we think it is (will try and check with a 'scope
> on monday that it is being taken high, the boot-loader starts it low).
> 
> The root has just the one device connected, and unfortunately the
> hw designer decided to hard-wire the D+ pull-up to 3.3V instead
> of the transceiver's pull pin.
> 
> Not tried usbmon yet. However if the hub is not being detected then
> probably won't show anything either.
> 
> I am going to install devmem2 into the root image and use it to poke
> around and see the state of the system at run time.
> 
> Thanks for looking in to this.

The hub is functioning, 3.3V is up, the ~RESET line is high and the
6MHz crystal is running at 6MHz.

I will get a register dump from both sets and compare.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius