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Atm, the BW allocated for an MST stream doesn't take into account the DSC control symbol (EOC) and data alignment overhead on the local (first downstream) MST link (reflected by the data M/N/TU values) and - besides the above overheads - the FEC symbol overhead on 8b/10b remote (after a downstream branch device) MST links. In addition the FEC overhead used on the local link is a fixed amount, which only applies to certain modes, but not enough for all modes; add a code comment clarifying this. Fix the above by calculating the data M/N values with the total BW overhead (not including the SSC overhead, since this isn't enabled by the source device) and using this the PBN and TU values for the local link and PBN for remote links (including SSC, since this is mandatory for links after downstream branch devices). For now keep the current fixed FEC overhead as a minimum, since this is what bspec requires for audio functionality. Calculate the effective link BW in a clearer way, applying the channel coding efficiency based on the coding type. The calculation was correct for 8b/10b, but not for 128b/132b links; this patch leaves the behavior for this unchanged, leaving the fix for a follow-up. v2: - Fix TU size programmed to the HW, making it match the payload size programmed to the payload table. v3: - Add code comment about the connection between the payload's size in the payload table and the corresponding PBN value. (Ville) - Add WARN_ON(remote_m_n.tu < dp_m_n.tu). (Ville) - Add code comment about factors not accounted for by the BW calculation in intel_dp_mst_mode_valid_ctx() (and compute config). (Ville) - Simplify calculation of PBN to remote_m_n.tu * mst_state->pbn_div. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> (v1) Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231107001505.3370108-2-imre.deak@intel.com |
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| README | ||
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.