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On some sepcial platforms (e.g. rk3399 platform), they will call usb_remove_hcd() to remove xhci hcd if no device connected, and also call xhci_stop() to halt and reset xhci. So we don't need to do the same thing in shutdown if hcd has been unregistered. In addition to remove hcd, rk3399 platform will disable xhci power domain in runtime suspend, if we try to access xhci registers in shutdown, it might cause kernel crash or unexpected behavior. BUG=chrome-os-partner:59111 TEST=reboot the system Change-Id: I7ecfce068211ff1c4a884fc4a8a54ca5b84c1c09 Signed-off-by: William wu <wulf@rock-chips.com> Reviewed-on: https://chromium-review.googlesource.com/401120 Commit-Ready: Guenter Roeck <groeck@chromium.org> Tested-by: Guenter Roeck <groeck@chromium.org> Reviewed-by: Guenter Roeck <groeck@chromium.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.
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.