Maxime Ripard
1701a23a4e
drm/vc4: kms: Use maximum FIFO load for the HVS clock rate
The core clock computation takes into account both the load due to the input (ie, planes) and its output (ie, encoders). However, while the input load needs to consider all the planes, and thus sum all of their associated loads, the output happens mostly in parallel. Therefore, we need to consider only the maximum of all the output loads, and not the sum like we were doing. This resulted in a clock rate way too high which could be discarded for being too high by the clock framework. Since recent changes, the clock framework will even downright reject it, leading to a core clock being too low for its current needs. Fixes: 16e101051f32 ("drm/vc4: Increase the core clock based on HVS load") Signed-off-by: Maxime Ripard <maxime@cerno.tech> Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Link: https://lore.kernel.org/r/20220613144800.326124-4-maxime@cerno.tech
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.
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