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b95e31cdfc
Add helpers to compute the required prefill line count and
adjustment factors for the scalers.
The "1st" variants hand out numbers for the first scaler stage
in the pipeline (pipe scaler if no plane scalers are enabled,
or the max from all the plane scaler). The "2nd" variants deal
with second scaler stage (pipe scaler when plane scaling is also
enabled, otherwise there is no second stage).
The _worst() variants give out worst case estimates, meant for
guardband sizing. The other variants are meant for the actual
vblank/guardband length check vs. prefill+pkgc/sagv latency.
The returned numbers are in .16 binary fixed point.
TODO: pretty rough, should check the actual scaler max scaling
factors instead of just assuming 3x everywhere
TODO: Reorder scaler assignment vs. vblank length check to get
the actual scale factors
v2: Drop debugs
v3: Ignore scale factors for the vblank length check for now
since we don't have the scalers assigned yet
Reviewed-by: Uma Shankar <uma.shankar@intel.com> #v1
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20251015125645.11230-1-ville.syrjala@linux.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.