enforce the Display Stream Compression

[Jani Nikula]

On Mon, 18 Dec 2023, Thomas <t.luettecken at web.de> wrote:
> I want to enforce the Display Stream Compression (DSC) of the Intel i915
> driver in Linux Ubuntu 22.04 to test it. While inspecting the source
> code, I came across a query called "force_dsc_output_format" that seems
> useful to me. My question is more general and pertains to the procedure
> for setting such queries/switches. How can I set this query to True to
> force DSC? Do I need to modify the kernel parameter line, and if so,
> how? Or is there another method?

There are connector debugfs files named i915_dsc_* for controlling
this. They are for debug and test purposes only. See the relevant igt
tests for how they're used in testing [1].

BR,
Jani.


[1] https://gitlab.freedesktop.org/drm/igt-gpu-tools

-- 
Jani Nikula, Intel