7a9ccdd1e0
There seems to be a bit of confusing redundancy in a way, how
plane data rate/min cdclk are calculated.
In fact both min cdclk, pixel rate and plane data rate are all
part of the same formula as per BSpec.
However currently we have intel_plane_data_rate, which is used
to calculate plane data rate and which is also used in bandwidth
calculations. However for calculating min_cdclk we have another
piece of code, doing almost same calculation, but a bit differently
and in a different place. However as both are actually part of same
formula, probably would be wise to use plane data rate calculations
as a basis anyway, thus avoiding code duplication and possible bugs
related to this.
Another thing is that I've noticed that during min_cdclk calculations
we account for plane scaling, while for plane data rate, we don't.
crtc->pixel_rate seems to account only for pipe ratio, however it is
clearly stated in BSpec that plane data rate also need to account
plane ratio as well.
So what this commit does is:
- Adds a plane ratio calculation to intel_plane_data_rate
- Removes redundant calculations from skl_plane_min_cdclk which is
used for gen9+ and now uses intel_plane_data_rate as a basis from
there as well.
v2: - Don't use 64 division if not needed(Ville Syrjälä)
- Now use intel_plane_pixel_rate as a basis for calculations both
at intel_plane_data_rate and skl_plane_min_cdclk(Ville Syrjälä)
v3: - Again fix the division macro
- Fix plane_pixel_rate to pixel_rate at intel_plane_pixel_rate
callsites
v4: - Renamed skl_plane_ratio function back(Ville Syrjälä)
v5: - Don't precalculate plane pixel rate for invisible plane,
check for visibility first, as in invisible case it will
have dst_w and dst_h equal to zero, causing divide error.
v6: - Removed useless warn in intel_plane_pixel_rate(Ville Syrjälä)
- Fixed alignment in intel_plane_data_rate(Ville Syrjälä)
- Changed pixel_rate type to be unsigned int in
skl_plane_min_cdclk(Ville Syrjälä)
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200227150935.2107-1-stanislav.lisovskiy@intel.com
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
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| Makefile | ||
| README | ||
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 Restructured Text 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.