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Some A3XX and A4XX GPU targets required that the GPU clock be programmed to a non zero value when it was disabled so 27Mhz was chosen as the "invalid" frequency. Even though newer targets do not have the same clock restrictions we still write 27Mhz on clock disable and expect the clock subsystem to round down to zero. For unknown reasons even though the slow clock speed is always 27Mhz and it isn't actually a functional level the legacy device tree frequency tables always defined it and then did gymnastics to work around it. Instead of playing the same silly games just hard code the "slow" clock speed in the code as 27MHz and save ourselves a bit of infrastructure. Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com> |
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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.