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In order to fix deadlock between dmcfreq and vop on/off, When change vop status and ddr frequency at the same time, the following deadlock will happen: vop no/off dmcfreq vop_crtc_disable update_devfreq ->mutex_lock(&vop->vop_lock); ->mutex_lock(&pd->pmu->mutex); ->pm_runtime_put(vop->dev); ->mutex_lock(&vop->vop_lock); ->mutex_lock(&pd->pmu->mutex); ... Change-Id: I56a4ee944200826d2a09e3ae8d2f4837f6f769d6 Signed-off-by: Finley Xiao <finley.xiao@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.