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According to USB Audio Device 1.0 Spec, Ch4.6.1.1: The wMaxPacketSize of endpoint is defined as follows: Maximum packet size of endpoint is capable of sending or receiving when this configuration is selected. This is determined by the audio bandwidth constraints of the endpoint. In current code, the wMaxPacketSize is limited to 200, and the bInterval is set to 4 (1ms). That is, the maximum bandwidth over USB bus is 200 * 1000 = 200000 bytes. We find an issue about bandwidth limitation when we try to support UAC1 with 8ch * 16bit * 16KHz on RK3308 platform, which needs more bandwidth than it can support. This patch sets the wMaxPacketSize dynamically according to the parameters of UAC1. It is similar to the same thing done earlier for f_uac2. Change-Id: I9af3fd7665a80b5eb0cfb5dc91ebe2c20df1dd46 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.