diff options
| author | Colin Cross <ccross@android.com> | 2011-02-10 02:08:32 -0800 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:34:10 -0800 |
| commit | 7dbe3f1aa2adb1667b651790f3907d91c835f031 (patch) | |
| tree | fe7c10d5b38e968469323b6d78174f6b06b15fb6 /arch/arm/vfp | |
| parent | 6bac48af375c25cfd970f06a8150e8a3d5d9ab8b (diff) | |
ARM: vfp: Use cpu pm notifiers to save vfp state
Signed-off-by: Colin Cross <ccross@android.com>
Diffstat (limited to 'arch/arm/vfp')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 79bcb4316930..e5a857ab8a64 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -21,6 +21,7 @@ #include <asm/cputype.h> #include <asm/thread_notify.h> #include <asm/vfp.h> +#include <asm/cpu_pm.h> #include "vfpinstr.h" #include "vfp.h" @@ -208,6 +209,35 @@ static struct notifier_block vfp_notifier_block = { .notifier_call = vfp_notifier, }; +static int vfp_cpu_pm_notifier(struct notifier_block *self, unsigned long cmd, + void *v) +{ + u32 fpexc = fmrx(FPEXC); + unsigned int cpu = smp_processor_id(); + + switch (cmd) { + case CPU_PM_ENTER: + if (last_VFP_context[cpu]) { + fmxr(FPEXC, fpexc | FPEXC_EN); + vfp_save_state(last_VFP_context[cpu], fpexc); + /* force a reload when coming back from idle */ + last_VFP_context[cpu] = NULL; + fmxr(FPEXC, fpexc & ~FPEXC_EN); + } + break; + case CPU_PM_ENTER_FAILED: + case CPU_PM_EXIT: + /* make sure VFP is disabled when leaving idle */ + fmxr(FPEXC, fpexc & ~FPEXC_EN); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block vfp_cpu_pm_notifier_block = { + .notifier_call = vfp_cpu_pm_notifier, +}; + /* * Raise a SIGFPE for the current process. * sicode describes the signal being raised. @@ -578,6 +608,7 @@ static int __init vfp_init(void) vfp_vector = vfp_support_entry; thread_register_notifier(&vfp_notifier_block); + cpu_pm_register_notifier(&vfp_cpu_pm_notifier_block); vfp_pm_init(); /* |