* enforce the Display Stream Compression
@ 2023-12-18 14:02 Thomas
2023-12-19 10:05 ` Jani Nikula
0 siblings, 1 reply; 2+ messages in thread
From: Thomas @ 2023-12-18 14:02 UTC (permalink / raw)
To: dri-devel
Hi,
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?
Kind regards,
Thomas
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: enforce the Display Stream Compression
2023-12-18 14:02 enforce the Display Stream Compression Thomas
@ 2023-12-19 10:05 ` Jani Nikula
0 siblings, 0 replies; 2+ messages in thread
From: Jani Nikula @ 2023-12-19 10:05 UTC (permalink / raw)
To: Thomas, dri-devel
On Mon, 18 Dec 2023, Thomas <t.luettecken@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
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