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Push regular plane/color management updates to the DSB, if other constraints allow it. The first part of the sequence will go as follows: - CPU will kick off DSB0 immediately - DSB0 writes double bufferd non-arming registers - DSB0 evades the vblank - DSB0 writes double buffered arming registers If no color management updates is needed we follow that up with: - DSB0 waits for the undelayed vblank - DSB0 waits for the delayed vblank (usec wait) - DSB0 emits an interrupt which will cause the CPU to complete the commit If color management update is needed: - DSB0 will start DSB1 with wait for undelayed vblank - DSB0 will in parallel perform the force DEwake tricks - DSB1 writes single buffered LUT registers - DSB1 waits for the delayed vblank (usec wait) - DSB1 emits an interrupt which will cause the CPU to complete the commit With this sequence we don't need to increase the vblank delay to make room for register programming during vblank, which is a good thing for high refresh rate display. But I'll need to still think of some way to eliminate VRR commit completion related races under this scheme. Stuff that isn't ready for DSB yet: - modesets (potentially we could do at least the plane enabling via DSB) - fastsets - VRR - PSR - scalers - async flips Reviewed-by: Animesh Manna <animesh.manna@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240930170415.23841-14-ville.syrjala@linux.intel.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.