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In Odroid XU3 Lite board, the temperature levels reported for thermal zone 0 were weird. In warm room: /sys/class/thermal/thermal_zone0/temp:32000 /sys/class/thermal/thermal_zone1/temp:51000 /sys/class/thermal/thermal_zone2/temp:55000 /sys/class/thermal/thermal_zone3/temp:54000 /sys/class/thermal/thermal_zone4/temp:51000 Sometimes after booting the value was even equal to ambient temperature which is highly unlikely to be a real temperature of sensor in SoC. The thermal sensor's calibration (trimming) is based on fused values. In case of the board above, the fused values are: 35, 52, 43, 58 and 43 (corresponding to each TMU device). However driver defined a minimum value for fused data as 40 and for smaller values it was using a hard-coded 55 instead. This lead to mapping data from sensor to wrong temperatures for thermal zone 0. Various vendor 3.10 trees (Hardkernel's based on Samsung LSI, Artik 10) do not impose any limits on fused values. Since we do not have any knowledge about these limits, use 0 as a minimum accepted fused value. This should essentially allow accepting any reasonable fused value thus behaving like vendor driver. The exynos5420-tmu-sensor-conf.dtsi is copied directly from existing exynos4412 with one change - the samsung,tmu_min_efuse_value. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Acked-by: Eduardo Valentin <edubezval@gmail.com> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com> Tested-by: Javier Martinez Canillas <javier@osg.samsung.com> Reviewed-by: Anand Moon <linux.amoon@gmail.com> Tested-by: Anand Moon <linux.amoon@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.