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Instead of direct calls of the link training functions, use a modeset commit to retrain a DP link in SST mode, similarly to how this is done in DP-MST mode. Originally the current way was chosen presumedly, because there wasn't a well-established way in place for the driver to do an internal (vs. userspace/kernel client) commit. Since then such internal commits became a common place (initial-, HDMI/TC link reset commit), so there is no reason to handle the DP-SST link-retraining case differently. At the end of the current sequence the HW reported a FIFO underrun - without other issues visible to users - because during retraining the link's encoder/port was disabled/re-enabled without also disabling/re-enabling the corresponding pipe/transcoder (as required by the spec); the corresponding underrun error message was suppressed as a known issue. Based on Ankit's test on DG2 the underrun error was still reported as it got detected with some (vblank) delay wrt. other platforms. Switching to a modeset commit resolves these underrun related issues. Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240712135724.660399-1-imre.deak@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.