Messages in this thread | | | Date | Tue, 05 Aug 2014 16:26:23 +0200 | From | Krzysztof Kozlowski <> | Subject | Re: [PATCH v5 0/5] ARM: EXYNOS: cpuidle: fix AFTR mode on boards with secure firmware enabled |
| |
On 05.08.2014 16:03, Daniel Lezcano wrote: > On 08/05/2014 03:34 PM, Bartlomiej Zolnierkiewicz wrote: >> Hi, >> >> This patch series adds support for AFTR idle mode on boards with >> secure firmware enabled and allows EXYNOS cpuidle driver usage on >> Exynos4x12 SoCs. >> >> It has been tested on Trats2 board (using Exynos4412 SoC with secure >> firmware enabled) on which AFTR mode reduces power consumption by ~12% >> when EXYNOS cpuidle driver is enabled (in both cases the default >> exynos_defconfig config is used and CPU1-3 are offlined). > > As a sidenote: > > On my odroid-U2: > * 4 cpus online -> 130 mA > * 3 cpus online -> 164 mA > * 2 cpus online -> 160 mA > * 1 cpu online -> 157 mA > > So were are consuming more when there are unplugged cpu ... any ideas ?
On which tree are you testing? Current next has ARMCLK down feature enabled. ARMCLK down may stop working after hotunplugging CPU: http://www.spinics.net/lists/arm-kernel/msg352890.html
That was observed especially on Exynos4212 where ARMCLK down stops working permanently. On Trats2 (Exynos4412) the clock down stopped only a for short period after disabling CPU.
Best regards, Krzysztof
| |