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Now that we have everything in place, we can start enabling the frontend. This is more difficult than one would assume since there can only be one plane using the frontend per-backend. We therefore need to make sure that the userspace will not try to setup multiple planes using it, since that would be impossible. In order to prevent that, we can create an atomic_check callback that will check that only one plane will effectively make use of the frontend in a given configuration, and will toggle the switch in that plane state so that the proper setup function can do their role. Reviewed-by: Chen-Yu Tsai <wens@csie.org> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Link: https://patchwork.freedesktop.org/patch/msgid/278e6c514a8311750fe627c7f28d58b3e2cbd825.1516613040.git-series.maxime.ripard@free-electrons.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.