1a7998dab5
The drm_plane_create_zpos_property() function asks for an initial value, and will set the associated plane state variable with that value if a state is present. However, that function is usually called at a time where there's no state yet. Since the drm_plane_state reset helper doesn't take care of reading that value when it's called, it means that in most cases the initial value will be 0, or the drivers will have to work around it. Let's add some code in __drm_atomic_helper_plane_state_reset() to get the initial zpos value if the property has been attached in order to fix this. Reviewed-by: Harry Wentland <harry.wentland@amd.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20220221095918.18763-8-maxime@cerno.tech
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 Restructured Text 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.