diff options
| author | Colin Cross <ccross@android.com> | 2011-02-10 10:08:32 (GMT) |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2011-09-23 06:35:30 (GMT) |
| commit | 746a9d1963f1c7a3cd22662065d7dcd3d93ee62e (patch) | |
| tree | 184b6ed198685e58f903da3c4c4d5c7b7fe25190 /arch | |
| parent | 254056f3b12563c11e6dbcfad2fbfce20a4f3302 (diff) | |
| download | linux-746a9d1963f1c7a3cd22662065d7dcd3d93ee62e.tar.xz | |
ARM: vfp: Use cpu pm notifiers to save vfp state
When the cpu is powered down in a low power mode, the vfp
registers may be reset.
This patch uses CPU_PM_ENTER and CPU_PM_EXIT notifiers to save
and restore the cpu's vfp registers.
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 79bcb43..fe4b60b 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -11,6 +11,7 @@ #include <linux/module.h> #include <linux/types.h> #include <linux/cpu.h> +#include <linux/cpu_pm.h> #include <linux/kernel.h> #include <linux/notifier.h> #include <linux/signal.h> @@ -436,9 +437,7 @@ static void vfp_enable(void *unused) set_copro_access(access | CPACC_FULL(10) | CPACC_FULL(11)); } -#ifdef CONFIG_PM -#include <linux/syscore_ops.h> - +#ifdef CONFIG_CPU_PM static int vfp_pm_suspend(void) { struct thread_info *ti = current_thread_info(); @@ -468,19 +467,33 @@ static void vfp_pm_resume(void) fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN); } -static struct syscore_ops vfp_pm_syscore_ops = { - .suspend = vfp_pm_suspend, - .resume = vfp_pm_resume, +static int vfp_cpu_pm_notifier(struct notifier_block *self, unsigned long cmd, + void *v) +{ + switch (cmd) { + case CPU_PM_ENTER: + vfp_pm_suspend(); + break; + case CPU_PM_ENTER_FAILED: + case CPU_PM_EXIT: + vfp_pm_resume(); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block vfp_cpu_pm_notifier_block = { + .notifier_call = vfp_cpu_pm_notifier, }; static void vfp_pm_init(void) { - register_syscore_ops(&vfp_pm_syscore_ops); + cpu_pm_register_notifier(&vfp_cpu_pm_notifier_block); } #else static inline void vfp_pm_init(void) { } -#endif /* CONFIG_PM */ +#endif /* CONFIG_CPU_PM */ /* * Ensure that the VFP state stored in 'thread->vfpstate' is up to date |