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bca5238816
On dra7, as per TRM, the HW shutdown (TSHUT) temperature is hardcoded to 123C and cannot be modified by SW. This means when the temperature reaches 123C HW asserts TSHUT output which signals a warm reset. This reset is held until the temperature goes below the TSHUT low (105C). While in SW, the thermal driver continuously monitors current temperature and takes decisions based on whether it reached an alert or a critical point. The intention of setting a SW critical point is to prevent force reset by HW and instead do an orderly_poweroff(). But if the SW critical temperature is greater than or equal to that of HW then it defeats the purpose. To address this and let SW take action before HW does keep the SW critical temperature less than HW TSHUT value. The value for SW critical temperature was chosen as 120C just to ensure we give SW sometime before HW catches up. Document reference SPRUI30C – DRA75x, DRA74x Technical Reference Manual - November 2016 SPRUHZ6H - AM572x Technical Reference Manual - November 2016 Tested on: DRA75x PG 2.0 Rev H EVM Signed-off-by: Ravikumar Kattekola <rk@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.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.