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[Why] * Clk Mgr DTO update point did not cover all needed updates, as it included a check for plane_state which does not exist yet when the updater is called on driver startup * This resulted in another update path in the pipe programming sequence, based on a dppclk update flag * However, this alternate path allowed for stray DTO updates, some of which would occur in the wrong order during dppclk lowering and cause underflow [How] * Remove plane_state check and use of plane_res.dpp->inst, getting rid of sequence dependencies (this results in extra dto programming for unused pipes but that doesn't cause issues and is a small cost) * Allow DTOs to be updated even if global clock is equal, to account for edge case exposed by diags tests * Remove update_dpp_dto call in pipe programming sequence (leave update to dppclk_control there, as that update is necessary and shouldn't occur in clk mgr) * Remove call to optimize_bandwidth when committing state, as it is not needed and resulted in sporadic underflows even with other fixes in place Signed-off-by: Noah Abradjian <noah.abradjian@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.