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[MOVED] USB UVC Isochronous problem , need help!

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mediatek

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I use USB2.0 for UVC application ,
found some stranger problem hope somebody can help me :
1. Use the usb (device) for bulk transfer , ok
2. Use the usb (device) for UVC , some pc is ok , but most are not ok.
the fail case show pid =00 ( unknow pid) , but the data append after pid is corrected in analyzer.

If bulk is ok for all pc , but isochronous not ok , does it mean SW(uvc driver) has some problem?
but pid =0 seems that it's HW problem ,
Can anybody help me and tell me what case that will let pid =0 ?

Tks in advance!
 

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