[Bug 220033] xhci: Compliance Issue - avg_trb_len not set for EP0 during Address Device Command

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220033

Mathias Nyman (mathias.nyman@linux.intel.com) changed:

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--- Comment #2 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
This is up for interpretation, spec is ambiguous 

xhci 1.2 Section 6.2.3.1 "Address Device Command usage" does not mention
Average TRB Length at all.

But section 4.8.2 "Endpoint Context Initialization"
states that: "All fields of an Input Endpoint Context data structure (including
the Reserved fields) shall be initialized to ‘0’ with the following exceptions:
4.8.2.1 Default Control Endpoint 0
 - Max Packet Size
 - CErr
 - TR Dequeue Pointer
 - Dequeue Cycle State (DCS)

According to it the Average TRB Length should be initialized to 0

I don't object to setting the Average TRB Length earlier, especially if it
solves device enumeration issues for some xHCI vendor. We do need to make
sure it doesn't brake enumeration for other vendors.

Can you submit a patch to linux-usb mailing list for this?

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