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For SoC's having software designed cursor plane, should be treated differently than hardware cursor planes. The DRM core initializes cursor plane by default with legacy_cursor_update set. Hence legacy_cursor_update can be use effectively to handle software cursor planes' update and atomicity functionalities. This patch uses this variable to decide in the atomic_check to whether add a requested plane to the list of affected planes or not, hence fixing the issue of co-existence of MPO, i.e, setting of available hardware planes like underlay and updation of cursor planes as well. Without this patch when underlay is set from user space, only blank screen with backlight is visible. Signed-off-by: Shirish S <shirish.s@amd.com> Reviewed-by: Harry Wentland <Harry.Wentland@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.