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The utmi clk is provided by the USB PHY for the USB controller. And the utmi clk is disabled if the USB PHY enter suspend mode. The current charge detection sets the USB PHY in suspend mode at first, then take about hundreds of milliseconds to do charge detection, in other words, the utmi clk will be disabled hundreds of milliseconds. It may cause the USB controller work abnormally during the charge detection. Actually, the conditions for charger detection is: 1. Set the utmi_opmode in non-driving mode. 2. Set the utmi_xcvrselect to FS speed. 3. Set the utmi_termselect to FS speed. 4. Enable the DP/DM pulldown resistor. This patch adds a new chg_mode to set the PHY in charge detection mode according to the above conditions, and set the PHY in normal mode to keep the utmi clk at the same time. Signed-off-by: William Wu <william.wu@rock-chips.com> Change-Id: I1cbf565d5145bdae5bc91132bc5fbff23a5cc443
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.