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    Subject[PATCH v2 4/5] ARM: vfp: Use cpu pm notifiers to save vfp state
    Date
    From: Colin Cross <ccross@android.com>

    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>
    [santosh.shilimkar@ti.com: Rebased against 3.1-rc4, resolved the conflicts]
    Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
    ---
    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
    --
    1.7.4.1


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