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20d88dd0fd
We usually need to write vop regs for debug, but this depend on io cmd
and devm,
they are often forget to be enabled, so we add this node to instead of
it:
you can use the following cmd to update VOP regs:
echo offset val > /sys/kernel/debug/dri/0/video_portx/regs_write
the video_portx is depend on hardware config, you can get this info
from the cmd:
cat /sys/kernel/debug/dri/0/summary
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Change-Id: I687ecc44dc638bfdf770983f96ce7b5470ff3691
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.