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We find that the UAC2 gadget can't be recognized on Windows 10. It's because that the descriptors of UAC2 doesn't meet the requirements of Windows. According to the USB Audio 2.0 Drivers of Windows [1], if the bmAttributes of OUT-EP in the audio stream interface is set to asynchronous (use USB_ENDPOINT_SYNC_ASYNC), then a feedback endpoint must be implemented in the respective alternate setting of the AS interface. The Windows driver does not support implicit feedback. However, it's difficult to implement the feedback endpoint now. So the patch changes the bmAttributes of OUT-EP to adaptive, and changes the bmAttributes of IN-EP to synchronous at the same time. This patch also sets the wTerminalType of terminal descriptor to microphone and speaker by default. With this patch, we also fix the wTotalLength of the ac_hdr_desc. [1] https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/usb-2-0-audio-drivers Change-Id: I3597d5f321235fcbce56dbfbfe95172d02e58892 Signed-off-by: William Wu <william.wu@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.