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According to the specification, the controller should check the device status before data transport. Generally, it can get the status of device via CMD13. It's upset that command communication will produce a little interrupt inside the controller. To avoid interrupt storm whilst heavily I/O request, use card_busy instead of send_status(CMD13). Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com> Change-Id: I3ba79ba2f563006112b0157b78aab5b31911b61a
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.