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68f0491d93
This patch adds a method to tuning phy with the following
parameters to improve usb driver strength and increase usb2
compatibility.
1. Set max ODT compensation voltage and current tuning reference.
2. Set max pre-emphasis level.
3. Disable the pre-emphasize in eop state and chirp state
to avoid mis-trigger the disconnect detection and also
avoid hs handshake fail.
We don't enable the phy tuning by default. If you want to
tuning phy, you can add a property "rockchip,u2phy-tuning"
in u2phy node, like this:
&u2phy0 {
rockchip,u2phy-tuning;
};
&u2phy1 {
rockchip,u2phy-tuning;
};
Conflicts:
Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
Change-Id: Iaa70e2ad3d5d06662be6c05e4d20784e5bb85ae9
Signed-off-by: William Wu <wulf@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@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.