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The INTF and CTL used in a display pipeline are going to be maintained as a part of the CRTC state (i.e, in mdp5_crtc_state). These entities, however, are currently statically assigned to drm_encoders (i.e. mdp5_encoder). Since these aren't directly visible to the CRTC, we assign them to the CRTC state in the encoder's atomic_check() op. With this approach, we assign portions of CRTC state in two different places: the layer mixer in CRTC's atomic_check(), and the INTF and CTL pieces in the encoder's atomic_check() op. We'd have more options here if the drm core maintained encoder state too, but the current approach of clubbing everything in CRTC's state works just fine. Unlike hwpipes and mixers, we don't need to keep a track of INTF/CTL assignments in the global atomic state. This is because they're currently not sharable resources. For example, INTF0 and CTL0 will always be assigned to one drm_encoder. This can change later when we implement writeback and want a CRTC to use a CTL for a while, and then release it for others to use it. Or, when a drm_encoder can switch between using a single INTF vs 2 INTFs. 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.