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From: Doron Holan [MSFT] on 28 Apr 2010 15:33
start adding logging to your driver and try to root cause it. changing how
the device enumerates is a band aid, not the real fix (and as tim pointed
out, there is no way to do what you want to do here, there is nothing for
you to filter)

d

--

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"Abei" <Abei(a)discussions.microsoft.com> wrote in message
news:725E07C8-8A4C-4B78-B079-C77040D47F10(a)microsoft.com...
> Hi, Tim!
> Our device driver can pass Windows 7/vista/XP x86 & x64 all device DTM
> test
> items and get log already.
> But it failed on system DTM test for a type of netbook.
> We can't know where is wrong of our driver.
>
> --
> Abei
>
>
> "Tim Roberts" wrote:
>
>> Abei <Abei(a)discussions.microsoft.com> wrote:
>> >
>> >Yes, I want the host controller to enumerate my device as a compsite
>> >device.
>> >My device reports it as a single function device. It will cause S3/S4
>> >resume
>> >system failed. But if I modify the device descriptor to a compsite
>> >device, it
>> >can't duplicate this issue.
>>
>> That is a driver issue, not a hardware issue. When you make it
>> composite,
>> all you are doing is adding another driver to the stack. Anything it can
>> do, you can do in YOUR driver. What class of device is this?
>>
>> >Since device descriptor (firmed in chip) can't be changed, I want to
>> >modify
>> >it in a lower filter driver before host controller driver gets my devcie
>> >descriptor. Can this lower filter driver achieve this goal?
>>
>> No. The host controller driver is the bottom-most driver in the USB
>> stack.
>> It performs transfers through DMA. It doesn't send any requests down for
>> you to filter, because there IS no driver below it.
>> --
>> Tim Roberts, timr(a)probo.com
>> Providenza & Boekelheide, Inc.
>> .
>>
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