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The sii902x hardware initialization process is during the probing, including gpio reset and some register operations. Because of the above, display will be affected during the switching between uboot logo and kernel logo. The modifications are as follows: 1.Add sii902x_is_enabled() to check whether hardware initialization has been done in uboot. 2.Add loader_protect flag to make sure whether hardwave initializaiont needs to be done, and the .mode_set() will not be called if logo enabled, which may cause display error. 3.Set gpiod_flags of enable/reset gpios to GPIOD_ASIS, and replace gpiod_set_value() with gpiod_direction_output(), in order to make gpios status unchanged from uboot to kernel. Signed-off-by: Damon Ding <damon.ding@rock-chips.com> Change-Id: I430402c2089602c9690fee03ff2ae9f9b2d3a419
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.