[U-Boot] [PATCH] usb: ci_udc: fix interaction with CONFIG_USB_ETH_CDC

[Stephen Warren]

On 06/27/2014 05:16 PM, Jörg Krause wrote:
> 
> On 06/27/2014 11:55 PM, Stephen Warren wrote:
>> On 06/27/2014 03:37 PM, Jörg Krause wrote:
>>> I added the last series of patches beginning from 2014-06-10 for testing
>>> purposes. The patches from 2014-05-29 were already applied.
>>>
>>> First series of patches:
>>>
>>>     Applying: usb: ci_udc: call udc_disconnect() from ci_pullup()
>>>     Applying: usb: ci_udc: fix freeing of ep0 req
>>>     Applying: usb: ci_udc: fix probe error cleanup
>>>     Applying: usb: ci_udc: clean up all allocations in unregister
>>>
>>> Calling tftp the first time after a reset runs fine,
>>
>> I thought the issue you reported was that the *first* time you run the
>> "tftp" command, it has issues such as timeouts? Did I misunderstand, or
>> did that issue somehow go away?
>
> That's right! This was the state before applying a series of patches
> after allow multiple buffer allocs per ep. Now, the first run of tftp
> runs without any errors.

Just to make sure I understand, here's what you saw:

1) tftp works fine to start with. No timeouts even on repeated invocation.

2) You applied "allow multiple buffer allocs per ep"

3) Now, you see tftp timeouts.

4) You applied "a series of patches *after* allow multiple buffer allocs
per ep"

5) Now, the first tftp command works fine, but repeated invocations fail
(intermittently).

And in (4) above the patch you applied that solved the problem was
"Applying: usb: ci_udc: fix interaction with CONFIG_USB_ETH_CDC"?

>>> But there is still a problem:
>>> I have to wait some seconds before I can run a second time tftp. This is
>>> the output from U-Boot:
>>>
>>>     => run update_rootfs
>>>     Updating rootfs ...
>>>     using ci_udc, OUT ep- IN ep- STATUS ep-
>>>     high speed config #1: 2 mA, Ethernet Gadget, using CDC Ethernet
>>>     USB network up!
>>>     Using usb_ether device
>>>     [snip]
>>>
>>>     => run update_rootfs
>>>     Updating rootfs ...
>>>     using ci_udc, OUT ep- IN ep- STATUS ep-
>>>     high speed config #1: 2 mA, Ethernet Gadget, using CDC Ethernet
>>>     ERROR: The remote end did not respond in time.
>>>     at drivers/usb/gadget/ether.c:2388/usb_eth_init()
>>>
>>> Wait some seconds ...
>>>
>>>     => run update_rootfs
>>>     Updating rootfs ...
>>>     using ci_udc, OUT ep- IN ep- STATUS ep-
>>>     high speed config #1: 2 mA, Ethernet Gadget, using CDC Ethernet
>>>     USB network up!
>>>     Using usb_ether device
>>>     [snip]
>>
>> Hmm. That's odd. I didn't notice that, but I'll try retesting sometime.
>> What exactly does $update_rootfs contain? It might be useful to know
>> some details of your network topology (e.g. is the TFTP server on the
>> machine that the USB cable is plugged into or further away, and are the
>> machine and network lightly loaded) and rough sizes of the files you're
>> downloading.
>
> This is what update_rootfs is doing:
> 
>       "update_rootfs=echo Updating rootfs ...; " \
>         "if tftp ${rootfs_file}; then " \
>           "mtdparts default; " \
>           "nand erase.part rootfs; " \
>           "ubi part rootfs; " \
>           "ubi create rootfs; " \
>           "ubi write ${loadaddr} rootfs ${filesize}; " \

I wonder if there's some kind of memory corruption caused by the
mtdparts, nand, or ubi commands? I'm especially curious about this,
since your other email mentioned that some mtd/ubi patches cause
complete networking failures.

If you *just* run "tftp ${rootfs_file}" over and over, does that work?
If so, perhaps try running more and more of the commands from
$update_rootfs above until you find the one that causes problems.

>         "fi; " \
>         "\0" \
> 
> Filesize of rootfs.ubifs is about 13 MB.
> 
> The tftp server (tftp-hpa 5.2-4) is running on my notebook (running Arch
> Linux), where the device is plugged via USB cable. Ethernet is not used,
> but wireless network, which is used "normal" I would say.

OK, that's basically the same setup I used for testing, network/USB-wise.

Unfortunately, I don't have and NAND or ubifs to test with.