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When we exit MPO, disconnected pipes cannot be immediately powergated because registers are double buffered, and actual disconnection does not happen until VUPDATE. So it is differred for many flips. However in the case of exiting full screen, the transition from MPO to grph only back to MPO is very fast and also involves increasing of watermarks. Since the underlay pipe is never powergated in this scenario, it keeps its old TTU counter, which causes allowPstateSwitch signal to be de-asserted when compared to the new increased watermark. Since the new pipe is not enabled yet, the signal will be continously de-asserted and hangs SMU, who's waiting for the signal to do pstate switching. Signed-off-by: Eric Yang <Eric.Yang2@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Harry Wentland <Harry.Wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.