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bad1e2e612
If hdmi plug in when kernel starting, hdmi may be without output. Because the old criteria that to determine whether uboot logo is on is hdmi phy pll locked and hdmi is connected. But in some platform(such as rk3229), hdmi phy pll is locked even hdmi phy is power down. In this case, the old criteria is unreliable. So we add a new criteria that check Frame Composer register.If the register value is not 0, we think that uboot logo is on, hdmi has been setup. Change-Id: Ifaa27030e5f5d551bec8f971694ff5d9c34a7c1d Signed-off-by: Algea Cao <algea.cao@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.