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b2fddb136d
[Why] Primary and underlay planes were previously exposed to DRM by using max_planes and max_slave_planes. The value for max_planes was always pipe_count + has_underlay. If there was an underlay pipe, then max_slave_planes = 1. Raven has pipe_count = 4, max_planes = 4, and max_slave_planes = 1. So during plane initialziation it was actually "creating" 1 overlay plane and 3 primary planes... or it would be, had its plane_type array not been dm_plane_type_default, which will only create DRM_PLANE_TYPE_PRIMARY planes. We can expose primary planes as supporting more than one CRTC at a time to more closely resemble plane behavior on DCN but userspace doesn't really expect planes to be used in this manner and will either ignore the planes or crash. Planes with index greater than max_streams are marked as supporting all CRTCs. No ASIC currently has primary plane count greater than the stream count but we shouldn't expose more than necessary. [How] Drop support for underlay planes. They aren't well tested and don't fully work right at the moment. Only create one primary plane per CRTC so we're not creating overlays. Initialize plane types directly instead of referencing a misleading array of plane types. 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.