Thread (2 messages) 2 messages, 2 authors, 2014-05-30

Re: [PATCH v1 1/3] usb: gadget: NCM: RX function support multiple NDPs

From: Jim Baxter <hidden>
Date: 2014-05-30 11:45:59
Also in: lkml

Possibly related (same subject, not in this thread)

On 29/05/14 19:55, Bjørn Mork wrote:
Jim Baxter [off-list ref] writes:
quoted
The NDP was ignoring the wNextNdpIndex in the NDP which
means that NTBs containing multiple NDPs would have missed
frames.
Well, just for the record: I believe this field was meant to be reserved
and always 0 in the CDC NCM spec.  Table 3-3, describing 16bit NDPs,
says so.  But reading the spec now, I noticed that there is an
inconsistency between table 3-3 and table 3-4 describing 32bit NDPs.  It
looks like the field is not reserved in the 32bit version.

I am pretty sure that is a specification error, but I guess it doesn't
harm to implement the support anyway.  And it paves the way for an MBIM
gadget :-)




Bjørn
Yes I was looking at Figure 3-1, Figure 3-2 which all state it is a
link. I must have been reading Table 3-4.

I am glad to see it helps with the MBIM specification :-) .

Jim
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