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We now always set vrr.flipline, vmin, and vmax for all platforms that support VRR. Therefore, we should set all TRANS_VRR_CTL bits except VRR_ENABLE. Without this, the readback for these bits will fail because we only read vrr.flipline, vmin, and vmax if TRANS_VRR_CTL has the FLIPLINE_EN bit set. For platforms that always have the VRR Timing Generator enabled, the FLIPLINE_EN bit is always set in TRANS_VRR_CTL during intel_transcoder_vrr_enable(). However, for the remaining platforms (that do not always have the VRR Timing Generator enabled) if a full modeset doesn't occur and VRR is not enabled, the bit is not set. This results in a mismatch between the software state and hardware state because the software state expects VRR timings like flipline, vmin, and vmax to be set, but the readout for these doesn't happen since the FLIPLINE_EN bit is not set in TRANS_VRR_CTL. To avoid this mismatch, write trans_vrr_ctl in intel_vrr_set_transcoder_timings() even when VRR is not enabled for platforms that do not have the VRR Timing Generator always enabled. Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://lore.kernel.org/r/20250324133248.4071909-15-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.