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03e7ac67e7
Enable damage clipping on the primary plane and iterate over small areas of reported framebuffer damage. Avoid the overhead of permanent full-screen updates that cirrus currently implements. This problem is indicated by the warning drm_plane_enable_fb_damage_clips() not called in the kernel's log. Without damage clipping, drivers do full updates of the screen area. This is costly as many screen updates, such as cursor movement or command-line input, only change a small portion of the output. Damage clipping allows renderers to inform drivers about the changed areas. With the damage information known, cirrus now iterates over a list of change areas and only flushes those to the hardware's scanout buffer. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230215161517.5113-10-tzimmermann@suse.de
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.