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Each Vivante GPU contains a clock divider which can divide the GPU clock by 2^n, which can lower the power dissipation from the GPU. It has been suggested that the GC600 on Dove is responsible for 20-30% of the power dissipation from the SoC, so lowering the GPU clock rate provides a way to throttle the power dissiptation, and reduce the temperature when the SoC gets hot. This patch hooks the Etnaviv driver into the kernel's thermal management to allow the GPUs to be throttled when necessary, allowing a reduction in GPU clock rate from /1 to /64 in power of 2 steps. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.