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It may take over 200ms for wait hpd ready. To optimize the resume time, we can power on eDP in init_hw, wait for hpd ready when doing link training. also create separate eDP enable function to make sure eDP is powered up before doing and DPCD access, as HPD low will result in DPDC transaction failure. After optimization, setpowerstate 145ms -> 9.8ms, DPMS 387ms -> 18.9ms Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com> Signed-off-by: Tony Cheng <tony.cheng@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.