Commits on Nov 11, 2024

1. drivers: usb: xhci: set HID bit in streaming endpoint contexts …

   The xHC may commence Host Initiated Data Moves for streaming endpoints -
   see USB3.2 spec s8.12.1.4.2.4. However, this behaviour is typically
   counterproductive as the submission of UAS URBs in {Status, Data,
   Command} order and 1 outstanding IO per stream ID means the device never
   enters Move Data after a HIMD for Status or Data stages with the same
   stream ID. For OUT transfers this is especially inefficient as the host
   will start transmitting multiple bulk packets as a burst, all of which
   get NAKed by the device - wasting bandwidth.
   
   Also, some buggy UAS adapters don't properly handle the EP flow control
   state this creates - e.g. RTL9210.
   
   Set Host Initiated Data Move Disable to always defer stream selection to
   the device. xHC implementations may treat this field as "don't care,
   forced to 1" anyway - xHCI 1.2 s4.12.1.
   
   Signed-off-by: Jonathan Bell <[email protected]>

   

   P33M committed Nov 11, 2024
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