59ad01c786
When we change the M/N values seamlessly during a fastset we should
also update the vblank timestamping stuff to make sure the vblank
timestamp corrections/guesstimations come out exact.
Note that only crtc_clock and framedur_ns can actually end up
changing here during fastsets. Everything else we touch can
only change during full modesets.
Technically we should try to do this exactly at the start of
vblank, but that would require some kind of double buffering
scheme. Let's skip that for now and just update things right
after the commit has been submitted to the hardware. This
means the information will be properly up to date when the
vblank irq handler goes to work. Only if someone ends up
querying some vblanky stuff in between the commit and start
of vblank may we see a slight discrepancy.
Also this same problem really exists for the DRRS downclocking
stuff. But as that is supposed to be more or less transparent
to the user, and it only drops to low gear after a long delay
(1 sec currently) we probably don't have to worry about it.
Any time something is actively submitting updates DRRS will
remain in high gear and so the timestamping constants will
match the hardware state.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Fixes: e6f29923c048 ("drm/i915: Allow M/N change during fastset on bdw+")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230310235828.17439-1-ville.syrjala@linux.intel.com
(cherry picked from commit 8cb1f95cca68421b08333175719fdd3615372ca8)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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.