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commit4e0dcf62abupstream. The vhub engine has two dma mode, one is descriptor list, another is single stage DMA. Each mode has different stop register setting. Descriptor list operation (bit2) : 0 disable reset, 1: enable reset Single mode operation (bit0) : 0 : disable, 1: enable Fixes:7ecca2a408("usb/gadget: Add driver for Aspeed SoC virtual hub") Cc: stable <stable@vger.kernel.org> Acked-by: Felipe Balbi <balbi@kernel.org> Acked-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com> Link: https://lore.kernel.org/r/20210108081238.10199-2-ryan_chen@aspeedtech.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.
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.