[PATCH v2 23/24] OMAP3: CPUidle: Make use of CPU PM notifiers
From: Santosh Shilimkar <hidden>
Date: 2011-09-24 06:14:43
Also in:
linux-omap
Subsystem:
arm port, omap2+ support, the rest · Maintainers:
Russell King, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
Save VFP CPU context using CPU PM notifier chain. VFP context is lost when CPU hits OFF state. Signed-off-by: Santosh Shilimkar <redacted> Reviewed-by: Kevin Hilman <redacted> Tested-by: Vishwanath BS <redacted> --- arch/arm/mach-omap2/cpuidle34xx.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c
index 4bf6e6e..861920a 100644
--- a/arch/arm/mach-omap2/cpuidle34xx.c
+++ b/arch/arm/mach-omap2/cpuidle34xx.c@@ -24,6 +24,7 @@ #include <linux/sched.h> #include <linux/cpuidle.h> +#include <linux/cpu_pm.h> #include <plat/prcm.h> #include <plat/irqs.h>
@@ -118,9 +119,23 @@ 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 (state == &dev->states[0]) { pwrdm_for_each_clkdm(mpu_pd, _cpuidle_allow_idle);
--
1.7.4.1