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MDSS represents the top level wrapper that contains MDP5, DSI, HDMI and other sub-blocks. W.r.t device heirarchy, it's the parent of all these devices. The power domain of this device is actually tied to the GDSC hw. When any sub-device enables its PD, MDSS's PD is also enabled. The suspend/resume ops enable the top level clocks that end at the MDSS boundary. For now, we're letting them all be optional, since the child devices anyway hold a ref to these clocks. Until now, we'd called a runtime_get() during probe, which ensured that the GDSC was always on. Now that we've set up runtime PM for the children devices, we can get rid of this hack. Note: that the MDSS device is the platform_device in msm_drv.c. The msm_runtime_suspend/resume ops call the funcs that enable/disable the top level MDSS clocks. This is different from MDP4, where the platform device created in msm_drv.c represents MDP4 itself. It would have been nicer to hide these differences by adding new kms funcs, but runtime PM needs to be enabled before kms is set up (i.e, msm_kms_init is called). Signed-off-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.