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25 lines
1.0 KiB
25 lines
1.0 KiB
What: /sys/bus/pci/drivers/xhci_hcd/.../dbc |
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Date: June 2017 |
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Contact: Lu Baolu <[email protected]> |
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Description: |
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xHCI compatible USB host controllers (i.e. super-speed |
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USB3 controllers) are often implemented with the Debug |
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Capability (DbC). It can present a debug device which |
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is fully compliant with the USB framework and provides |
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the equivalent of a very high performance full-duplex |
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serial link for debug purpose. |
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The DbC debug device shares a root port with xHCI host. |
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When the DbC is enabled, the root port will be assigned |
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to the Debug Capability. Otherwise, it will be assigned |
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to xHCI. |
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Writing "enable" to this attribute will enable the DbC |
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functionality and the shared root port will be assigned |
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to the DbC device. Writing "disable" to this attribute |
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will disable the DbC functionality and the shared root |
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port will roll back to the xHCI. |
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Reading this attribute gives the state of the DbC. It |
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can be one of the following states: disabled, enabled, |
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initialized, connected, configured and stalled.
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