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| author | Christian Neumüller <cn00@gmx.at> | 2014-12-20 23:59:48 +0100 |
|---|---|---|
| committer | Christian Neumüller <cn00@gmx.at> | 2014-12-30 12:53:44 +0100 |
| commit | c426a2fdfd6caff7ef2cd4fd5d54cf8e7a5b6ebb (patch) | |
| tree | 473e47fa9b2e517afb9b79ca5bff8a005699fc97 /arch | |
| parent | 55485801fb3b431743f029c5f8d0e9b1a2f8367f (diff) | |
| download | kernel_samsung_smdk4412-c426a2fdfd6caff7ef2cd4fd5d54cf8e7a5b6ebb.zip kernel_samsung_smdk4412-c426a2fdfd6caff7ef2cd4fd5d54cf8e7a5b6ebb.tar.gz kernel_samsung_smdk4412-c426a2fdfd6caff7ef2cd4fd5d54cf8e7a5b6ebb.tar.bz2 | |
ARM: Exynos: Call cpu_pm_enter/exit in Low Power States.
In low power cpuidle states, the FPU registers get corrupted. By calling
cpu_pm_enter, the VFP module gets notified so that it saves the FPU state and
restores it from RAM the next time a thread uses it.
The comments at cpu_pm_enter/exit indicate that these functions must be called
with interrupts disabled, so place the calls between
local_irq_disable/local_irq_enble.
See http://forum.xda-developers.com/showthread.php?p=57637134 to
http://forum.xda-developers.com/showthread.php?p=57643086.
Change-Id: Icde0ab93734cf2a4febfabc3c04e77ce955bd9da
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-exynos/cpuidle-exynos4.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/cpuidle-exynos4.c b/arch/arm/mach-exynos/cpuidle-exynos4.c index 2fd7953..88b941f 100644 --- a/arch/arm/mach-exynos/cpuidle-exynos4.c +++ b/arch/arm/mach-exynos/cpuidle-exynos4.c @@ -10,6 +10,7 @@ #include <linux/kernel.h> #include <linux/init.h> +#include <linux/cpu_pm.h> #include <linux/cpuidle.h> #include <linux/io.h> #include <linux/suspend.h> @@ -568,6 +569,8 @@ static int exynos4_enter_core0_aftr(struct cpuidle_device *dev, local_irq_disable(); + cpu_pm_enter(); + if (log_en) pr_info("+++aftr\n"); @@ -630,6 +633,8 @@ early_wakeup: if (log_en) pr_info("---aftr\n"); + cpu_pm_exit(); + local_irq_enable(); idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC + (after.tv_usec - before.tv_usec); @@ -663,6 +668,8 @@ static int exynos4_enter_core0_lpa(struct cpuidle_device *dev, #endif local_irq_disable(); + cpu_pm_enter(); + #if defined(CONFIG_INTERNAL_MODEM_IF) || defined(CONFIG_SAMSUNG_PHONE_TTY) gpio_set_value(GPIO_PDA_ACTIVE, 0); #endif @@ -763,6 +770,8 @@ early_wakeup: gpio_set_value(GPIO_PDA_ACTIVE, 1); #endif + cpu_pm_exit(); + local_irq_enable(); idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC + (after.tv_usec - before.tv_usec); |