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The rk3399 hdmi phy is supplied by the vpll directly and needs to adapt that frequency depending on the selected resolution on the hdmi output. For the hdmi-phy the vpll frequency is supplied unchanged without any dividers being present there. The vpll also is one of the sources the general display clock of the visual output processor (vop) and as it is somewhat special for display operations possibly also the preferred pll source. Here a divider is available between the pll-mux and the vop clock, so that this part can adapt the resulting frequency if needed. So to keep the vop clock in line with the target rate, set the newly introduced CLK_KEEP_REQ_RATE flag for the dclk_vop clocks on rk3399. (am from https://patchwork.kernel.org/patch/8993771/) Change-Id: Iba9a179b764472f22d7531eb0c662dcd982433d4 Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Xing Zheng <zhengxing@rock-chips.com> Signed-off-by: Elaine Zhang <zhangqing@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.