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| author | Lukasz Majewski <l.majewski@samsung.com> | 2014-04-10 16:46:08 +0200 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:47:28 +0900 |
| commit | 619b370f569ba6d3d05c175c1fe0dbc311f1d74b (patch) | |
| tree | b0f6d43fb86806f23e4b4f8239ff4fec4f878175 /arch/arm/mach-exynos/cpuidle.c | |
| parent | fd3a1558a2ae3f3636c25cbb22ae35138594e54e (diff) | |
| download | linux-3.10-619b370f569ba6d3d05c175c1fe0dbc311f1d74b.tar.gz linux-3.10-619b370f569ba6d3d05c175c1fe0dbc311f1d74b.tar.bz2 linux-3.10-619b370f569ba6d3d05c175c1fe0dbc311f1d74b.zip | |
cpuidle:clk:Exynos4412: Enable support for clock down when WFI cpuidle state is entered
This patch adds support for setting ARM cores' clock frequency down when
entering WFI/WFE based cpuidle state.
On the Trats2 device: performance governor, 1.4 GHz frequency, no extra
load, 4 cores enabled:
Without core clock down feature: 395 mA
With core clock down feature: 337 mA
Power consumption reduction around 15%
Change-Id: I7bae29b0332a97c7b18ffb79f4b0a5ff3d70b7ce
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Diffstat (limited to 'arch/arm/mach-exynos/cpuidle.c')
| -rw-r--r-- | arch/arm/mach-exynos/cpuidle.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/arm/mach-exynos/cpuidle.c b/arch/arm/mach-exynos/cpuidle.c index df195ed0891..11c3db7b165 100644 --- a/arch/arm/mach-exynos/cpuidle.c +++ b/arch/arm/mach-exynos/cpuidle.c @@ -167,7 +167,7 @@ static int exynos4_enter_lowpower(struct cpuidle_device *dev, return exynos4_enter_core0_aftr(dev, drv, new_index); } -static void __init exynos5_core_down_clk(void) +static void __init exynos_core_down_clk(void) { unsigned int tmp; @@ -183,7 +183,15 @@ static void __init exynos5_core_down_clk(void) PWR_CTRL1_USE_CORE0_WFE | \ PWR_CTRL1_USE_CORE1_WFI | \ PWR_CTRL1_USE_CORE0_WFI; - __raw_writel(tmp, EXYNOS5_PWR_CTRL1); + + if (soc_is_exynos4412()) + tmp |= PWR_CTRL1_USE_CORE3_WFE | \ + PWR_CTRL1_USE_CORE2_WFE | \ + PWR_CTRL1_USE_CORE3_WFI | \ + PWR_CTRL1_USE_CORE2_WFI; + + __raw_writel(tmp, soc_is_exynos5250() ? EXYNOS5_PWR_CTRL1 + : EXYNOS4_PWR_CTRL1); /* * Enable arm clock up (on exiting idle). Set arm divider @@ -196,7 +204,9 @@ static void __init exynos5_core_down_clk(void) PWR_CTRL2_DUR_STANDBY1_VAL | \ PWR_CTRL2_CORE2_UP_RATIO | \ PWR_CTRL2_CORE1_UP_RATIO; - __raw_writel(tmp, EXYNOS5_PWR_CTRL2); + + __raw_writel(tmp, soc_is_exynos5250() ? EXYNOS5_PWR_CTRL2 + : EXYNOS4_PWR_CTRL2); } static int __init exynos4_init_cpuidle(void) @@ -204,8 +214,8 @@ static int __init exynos4_init_cpuidle(void) int cpu_id, ret; struct cpuidle_device *device; - if (soc_is_exynos5250()) - exynos5_core_down_clk(); + if (soc_is_exynos4412() || soc_is_exynos5250()) + exynos_core_down_clk(); ret = cpuidle_register_driver(&exynos4_idle_driver); if (ret) { |