On Fri, Jul 18, 2014 at 3:36 PM, Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> wrote: > Enable ARMCLK down feature on all Exynos4 SoCs. The frequency of > ARMCLK will be reduced upon entering idle mode (WFI or WFE). > > The feature behaves like very fast cpufreq ondemand governor. In idle > mode this reduces energy consumption on full frequency chosen by > cpufreq governor by approximately: > - Trats2: 6.5% (153 mA -> 143 mA) > - Trats: 33.0% (180 mA -> 120 mA) > - Gear1: 27.0% (180 mA -> 130 mA) > > The patch uses simillar settings as Exynos5250 (clk-exynos5250.c), > except it disables clock up feature and on Exynos4412 ARMCLK down is > enabled for all 4 cores. > > Tested on Trats board (Exynos4210), Trats2 board (Exynos4412) and > Samsung Gear 1 (Exynos4212). > > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> Tested on ODROID-U2, seems to be working. I don't have a way of measuring the power usage, but the system seems as stable as before. Tested-by: Daniel Drake <drake@xxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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