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When the display start interrupt occurs, we know that the hardware has finished loading the active display list. The driver then proceeds to recycle the list, assuming it won't be needed anymore. This assumption holds true for headerless display lists, as the VSP doesn't reload the list for the next frame if it hasn't changed. However, this isn't true anymore for header display lists, as they are loaded at every frame start regardless of whether they have been updated. To prepare for header display lists usage in display pipelines, we need to postpone recycling the list until it gets replaced by a new one through a page flip. The driver already does so in the frame end interrupt handler, so all we need is to skip list recycling in the display start interrupt handler. While the active list can be recycled at display start for headerless display lists, there's no real harm in postponing that to the frame end interrupt handler in all cases. This simplifies interrupt handling as we don't need to process the display start interrupt anymore. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.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.