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The VOP2 has limitations on its input and output sizes. The clipped display region must be at least 4px in each dimension for both framebuffer source and plane destination, and the clipped source region must be no greater than a per-version limit. It is never valid for VOP2 to have a framebuffer which is less than four pixels in either dimension, so declare that as our min width/height, enforced by AddFB failing if the user tries. It can theoretically be valid to have a single large framebuffer of which only certain clipped regions are shown, but this is a very uncommon case. Declaring to userspace that the framebuffer's maximum width and height is the maximum source clip helps it make better decisions as to which mode to use, instead of trying unsupported sizes and having to fall back. Signed-off-by: Daniel Stone <daniels@collabora.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://lore.kernel.org/r/20251015110042.41273-3-daniels@collabora.com
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 reStructuredText 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.