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e5c4197090
[Why] The current dc_caps doesn't provide the information needed to determine the count and type of each plane to be exposed to userspace. There are three types of DRM planes that are exposed to userspace: 1. Primary planes (can be used for modesetting) 2. Overlay planes (can be blended below or above a primary plane) 3. Cursor planes (blended topmost) We need to know the number and type of each in amdgpu_dm to expose to userspace. Hardware supports blending planes below, above or both ways depending on the ASIC. Alpha support is also ASIC dependent. Some hardware has dedicated pipes for overlays and other hardware combines the pipes. All of this should be exposed in a way that DM can query and use. [How] Introduce the dc_plane_cap structure that describes the capabilities for the hw planes. It describes: - the type of the plane - whether the plane can blend with planes below it - whether the plane can blend with planes above it - whether the plane supports per pixel alpha blending - supported formats on the plane (partial list for now) Pre DCN ASICs don't have their full capabilities described for now. They can be updated as needed in the future. Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> |
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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.