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Atm, in the DP SST case the FEC state is computed before intel_crtc_state::port_clock is initialized, hence intel_dp_is_uhbr() will always return false and the FEC state will be always computed assuming a non-UHBR link. This happens to work, since the FEC state is recomputed later in intel_dp_mtp_tu_compute_config(), where port_clock will be set already, so intel_crtc_state::fec_enable will be reset as expected for UHBR. This also depends on link rates being tried in an increasing order (i.e. from non-UHBR -> UHBR link rates) in dsc_compute_link_config(), thus intel_crtc_state::fec_enable being set for the non-UHBR rates and getting reset for the first UHBR rate as expected. A follow-up change will reuse intel_dp_fec_compute_config() for the DP MST state computation, prepare for that here, making sure that the function determines the correct intel_crtc_state::fec_enable=false state for UHBR link rates based on the above. The DP SST and MST state computation should be further unified to avoid computing/setting the intel_crtc_state::fec_enable state multiple times, but that's left for a follow-up change. For now add only code comments about this. Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Jouni Högander <jouni.hogander@intel.com> Link: https://lore.kernel.org/r/20251015161934.262108-3-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.