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The __drm_atomic_get_current_plane_state() function tries to get and return the existing plane state, and if it doesn't exist returns the one stored in the drm_plane->state field. Using the current nomenclature, it tries to get the existing plane state with an ad-hoc implementation of drm_atomic_get_existing_plane_state(), and falls back to either the old or new plane state, depending on whether it is called before or after drm_atomic_helper_swap_state(). The existing plane state itself is deprecated, because it also changes when swapping states from the new state to the old state. Fortunately for us, we can simplify things. Indeed, __drm_atomic_get_current_plane_state() is only used in two macros: intel_atomic_crtc_state_for_each_plane_state and drm_atomic_crtc_state_for_each_plane_state(). The intel variant is only used through the intel_wm_compute() function that is only ever called in intel_crtc_atomic_check(). The generic variant is more widely used, and can be found in the malidp, msm, tegra and vc4 drivers. All of these call sites though are during atomic_check(), so we end up in the same situation than Intel's. Thus, we only ever use the existing state as the new state, and plane->state is always going to be the old state. Any plane isn't guaranteed to be part of the state though, so we can't rely on drm_atomic_get_old_plane_state() and we still need to use plane->state. Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://lore.kernel.org/r/20250930-drm-no-more-existing-state-v5-4-eeb9e1287907@kernel.org Signed-off-by: Maxime Ripard <mripard@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.