>> The only clue would seem to be those comments you made about the
>> host only supporting a single CDC Ethernet implementation, with
>> specific endpoint assignments. That's sloppy and stupid coding,
>> but you should be able to hack the Linux code so it makes the same
>> assignments ... purely as a workaround for the host bug, whereby
>> it's ignoring the descriptors provided by the peripheral.
>
> I have the Linux Host-side driver for this very chip with me (given
> by the vendor)...will that help in debugging the problem further??
>
> Like, can it help explain how the host might be interpreting the EP
> descriptors
> that the ether gadget driver is sending while enumerating?
I also noted that the gadget driver was responding to a get_config
request, from the host, by advertising bNumInterfaces as 2 in the
ether config ("eth_config").
Since the data-sheet of the chip mentions the device supports only 1
interface, I thought I'll force the driver to do the same by making it
behave as a CDC subset (that supports only 1 interface). But that
sadly did not help! :/
Here's the usb requests logged during enumeration...i'd put my
own debugs in the eth_setup() path. The number in brackets is the
value in HEX.
[32275.703125] __________USB control req___________
[32275.703125] bRequest(06) - Get descriptor
[32275.703125] bRequestType(80) - IN Standard
[32275.703125] wValue(0100) - Device
[32275.703125] wLength(0008)
[32275.703125] ____________________________________
[32275.703125]
[32275.703125] __________USB control req___________
[32275.703125] bRequest(06) - Get descriptor
[32275.703125] bRequestType(80) - IN Standard
[32275.703125] wValue(0100) - Device
[32275.703125] wLength(0012)
[32275.703125] ____________________________________
[32275.703125]
[32275.703125] __________USB control req___________
[32275.703125] bRequest(06) - Get descriptor
[32275.703125] bRequestType(80) - IN Standard
[32275.703125] wValue(0200) - Configuration
[32275.703125] wLength(0009)
[32275.703125] ____________________________________
[32275.703125]
[32275.703125]
[32275.703125] __________USB control req___________
[32275.703125] bRequest(06) - Get descriptor
[32275.703125] bRequestType(80) - IN Standard
[32275.703125] wValue(0200) - Configuration
[32275.703125] wLength(0009)
[32275.703125] ____________________________________
[32275.703125]
[32275.703125]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(06) - Get descriptor
[32275.710937] bRequestType(80) - IN Standard
[32275.710937] wValue(0300) - String
[32275.710937] wLength(0002)
[32275.710937] ____________________________________
[32275.710937]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(06) - Get descriptor
[32275.710937] bRequestType(80) - IN Standard
[32275.710937] wValue(0300) - String
[32275.710937] wLength(0004)
[32275.710937] ____________________________________
[32275.710937]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(06) - Get descriptor
[32275.710937] bRequestType(80) - IN Standard
[32275.710937] wValue(0301) - String
[32275.710937] wLength(0002)
[32275.710937] ____________________________________
[32275.710937]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(06) - Get descriptor
[32275.710937] bRequestType(80) - IN Standard
[32275.710937] wValue(0301) - String
[32275.710937] wLength(003a)
[32275.710937] ____________________________________
[32275.710937]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(06) - Get descriptor
[32275.710937] bRequestType(80) - IN Standard
[32275.710937] wValue(0302) - String
[32275.710937] wLength(0002)
[32275.710937] ____________________________________
[32275.710937]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(06) - Get descriptor
[32275.710937] bRequestType(80) - IN Standard
[32275.710937] wValue(0302) - String
[32275.710937] wLength(0020)
[32275.710937] ____________________________________
[32275.710937]
[32275.710937] __________USB control req___________
[32275.710937] bRequest(09) - Set configuration
[32275.710937] bRequestType(00) - OUT Standard
[32275.710937] wValue(0001)
[32275.710937] wLength(0000)
[32275.710937] ____________________________________
Does this show a problem?
Thanks for your time.
Regards,
-mandeep
>
> Thanks again,
> -mandeep
>
>>
>> - Dave
>>
>
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
