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ARM: OMAP3: CPUidle: Make use of CPU PM notifiers

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Save VFP CPU context using CPU PM notifier chain. VFP context
is lost when CPU hits OFF state.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Santosh Shilimkar 2011-09-03 22:38:27 +05:30 committed by Kevin Hilman
parent 98be0dde19
commit ff819da442
1 changed files with 15 additions and 0 deletions
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15
arch/arm/mach-omap2/cpuidle34xx.c
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@ -25,6 +25,7 @@
#include <linux/sched.h>
#include <linux/cpuidle.h>
#include <linux/export.h>
#include <linux/cpu_pm.h>
#include <plat/prcm.h>
#include <plat/irqs.h>
@ -124,9 +125,23 @@ static int omap3_enter_idle(struct cpuidle_device *dev,
pwrdm_for_each_clkdm(core_pd, _cpuidle_deny_idle);
}
/*
* Call idle CPU PM enter notifier chain so that
* VFP context is saved.
*/
if (mpu_state == PWRDM_POWER_OFF)
cpu_pm_enter();
/* Execute ARM wfi */
omap_sram_idle();
/*
* Call idle CPU PM enter notifier chain to restore
* VFP context.
*/
if (pwrdm_read_prev_pwrst(mpu_pd) == PWRDM_POWER_OFF)
cpu_pm_exit();
/* Re-allow idle for C1 */
if (index == 0) {
pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle);