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rockchip_clocks_loader_protect() always call in arch_initcall_sync(). However, rockchip_clocks_loader_unprotect() is not called when the DRM driver is not loaded, which assumes that these clocks will always be enabled. This may cause the clock to be turned on accidentally. In the case of ebc, for example, when the ebc driver is enabled and the DRM driver is not loaded, rockchip_clocks_loader_protect() will enable ebc clk. In addition, rockchip_clocks_loader_unprotect() will not be called, meaning that the ebc clock will always be on. However, the ebc driver will also control the ebc clk, but it will not be able to actually turn off the clk. The dmc driver will check the status of the clk in the CRU while working, and it will always find that the clk is on. This will cause a wrong judgment on the working status of the ebc. This patch adds constraints to rockchip_clocks_loader_protect() to protect clocks only when route nodes are available, which means that the logo is already enabled during the u-boot stage, so it makes sense to perform clock loader protect. Change-Id: Ib9efbade547181e86516d19637995569a751fade Signed-off-by: Chaoyi Chen <chaoyi.chen@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.
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.