mirror of
https://github.com/torvalds/linux.git
synced 2026-07-30 11:11:26 +02:00
Linux kernel source tree
2b4c2a5e4d
Add helpers to compute the CDCLKl adjustment factor for prefill
calculations. The adjustment factor is always <= 1.0. That is,
a faster CDCLK speeds up the pipe prefill.
intel_cdclk_prefill_adjustment_worst() gives out a worst case estimate,
meant to be used during guardband sizing. We can actually do better
than 1.0 here because the absolute minimum CDCLK is limited by the
dotclock. This will still allow planes, pfit, etc. to be changed any
which way without having to resize the guardband yet again.
intel_cdclk_prefill_adjustment() is supposed to give a more accurate
value based on the current min cdclk for the pipe, but currently that
is not yet available when this gets called. So for now use the same
worst case estimate here.
The returned numbers are in .16 binary fixed point.
TODO: the intel_cdclk_prefill_adjustment_worst() approach here
can result in guardband changes for DRRS. But I'm thinking
that is fine since M/N changes will always happen on the
legacy timing generator so guardband doesn't actually matter.
May need to think about this a bit more though...
v2: Use the worst case estimate always for now
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/20251014191808.12326-4-ville.syrjala@linux.intel.com
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.