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Atomic drivers may set properties like rotation on the same fb, which may require a call to prepare_fb even when framebuffer stays identical. Instead of handling all the special cases in the core, let the driver decide when prepare_fb and cleanup_fb are noops. This is a revert of: commitfcc60b413dAuthor: Keith Packard <keithp@keithp.com> Date: Sat Jun 4 01:16:22 2016 -0700 drm: Don't prepare or cleanup unchanging frame buffers [v3] The original commit mentions that this prevents waiting in i915 on all previous rendering during cursor updates, but there are better ways to fix this. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/6d82f9b6-9d16-91d1-d176-4a37b09afc44@linux.intel.com (cherry picked from commit0532be078a) Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1485854491-27389-2-git-send-email-maarten.lankhorst@linux.intel.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.