We ran into a problem when using ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller (integrated on the desktop's motherboard) with Linux xHCI driver. The host is sending the SuperSpeed device a large control transfer (>512B) that requires multiple OUT transactions. The first OUT Txn is acknowledged, but then the subsequent one is sent by the host with the same sequence number. I am attaching a protocol analysis trace (taken with the Beagle 5000 SuperSpeed Protocol Analyzer) that illustrates the problem. It can be opened with the Total Phase Data Center software: http://www.totalphase.com/products/data_center/ The same interaction with the same device works with an Intel xHCI host. We are not sure if this is a low-level bug with the ASMedia host or if there is some setup/workaround that can be done within the Linux xHCI driver to fix this problem.
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control_xfer_broken.tdc
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Attachment:
control_xfer_works.tdc
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