Ankit Nautiyal bef1e60c70 drm/i915/vrr: Prepare for fixed refresh rate timings
Currently we always compute the timings as if vrr is enabled.
With this approach the state checker becomes complicated when we
introduce fixed refresh rate mode with vrr timing generator.

To avoid the complications, instead of always computing vrr timings, we
compute vrr timings based on uapi.vrr_enable knob.
So when the knob is disabled we always compute vmin=flipline=vmax.

v2: Use actual timings without any adjustments while preparing for
fixed timings in compute_config. (Ville)
v3: Avoid setting fixed timings if !vrr_possible().
v4: Move vmin adjustement after all other timings are complete. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> (#v2)
Link: https://patchwork.freedesktop.org/patch/msgid/20250311093751.1329043-8-ankit.k.nautiyal@intel.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 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.
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