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The reason for enabling FEC for an uncompressed stream on an MST link is that the DSC compression is enabled for another stream on the same link. For such an uncompressed stream FEC doesn't need to be supported on the whole path until the (DP-SST) sink DPRX. For instance if a branch device - like a monitor with an MST branch device within it - is plugged to a DFP connector of an MST docking station and the monitor's branch device does not support FEC, the docking station's branch device will still enable the link to the monitor correctly, disabling the FEC on that link as expected. Since it's been verified already that FEC is supported for the compressed stream above, the corresponding check for the uncompressed stream can be dropped: the check for the compressed stream implies already that FEC is supported on the link between the source DPTX and immediate downstream branch device. If FEC is not supported on the whole path until the sink DPRX, FEC will be disabled by a downstream branch device on the path as described above for the MST dock + MST monitor configuration example. This fixes a problem in the above MST dock + MST monitor example, where the dock supports FEC, but the monitor doesn't support it and FEC gets enabled on the link due to DSC getting enabled for another monitor's stream on the same link. Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14254 Reviewed-by: Jouni Högander <jouni.hogander@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patch.msgid.link/20251028113536.602352-1-imre.deak@intel.com |
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| init | ||
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| ipc | ||
| kernel | ||
| lib | ||
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| .mailmap | ||
| .pylintrc | ||
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| Kbuild | ||
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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 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.