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On ICL/TGL the VRR hardware injects an extra scanline just after vactive. This essentically behaves the same as an extra line of vblank delay, except it only appears in this one specific spot. Consider our DSB interrupt signalling scheme: 1. arm the update 2. wait for undelayed vblank (or rather safe window with VRR) 3. wait for enough usecs to get past the delayed vblank 4. signal interrupt to indicate that arming has latched If step 2 waits for end of vactive step 3 needs to account for the extra one scanline, or else we risk signalling the interrupt before the delayed vblank has actually elapsed. So include the extra scanline in our vblank delay estimates. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241210211007.5976-16-ville.syrjala@linux.intel.com Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@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 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.