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12cdfb61b3
[Why] dm_mst_get_pbn_divider() returns value integer coming from the cast from fixed point, but the casted integer will then be used in dfixed_const to be multiplied by 4096. The cast from fixed point to integer causes the calculation error becomes bigger when multiplied by 4096. That makes the calculated pbn_div value becomes smaller than it should be, which leads to the req_slot number becomes bigger. Such error is getting reflected in 8k30 timing, where the correct and incorrect calculated req_slot 62.9 Vs 63.1. That makes the wrong calculation failed to light up 8k30 after a dock under HBR3 x 4. [How] Restore the accuracy by keeping the fraction part calculated for the left shift operation. Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com> Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com> Signed-off-by: Wayne Lin <wayne.lin@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.