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The TCON has a mux to select the source of the data to display. This mux includes selecting the display backends. On the A31, which has two display pipelines, this mux can let the TCON select either backend as its data source. Although the muxing can be changed on the fly, DRM needs to be able to group a bunch of layers such that they get switched to another crtc together. This is because the display backend does the layer compositing, while the TCON generates the display timings. This constraint is not supported by DRM. Here we simply pair up backends and TCONs with the same ID. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170908075016.18657-7-wens@csie.org |
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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.