[PATCH 2/5] ARM: OMAP2+: PM: use the power domains registers cache for the power states

From: Jean Pihet <redacted>

Use the caching API for the previous, current and next power domains states.

Signed-off-by: Jean Pihet <redacted>
---
 arch/arm/mach-omap2/powerdomain.c |   32 ++++++++++++++++++++++++++------
 1 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 18e1ffc..2058e27 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c

@@ -854,6 +854,8 @@ int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
 					  smp_processor_id());
 		/* Program the pwrdm desired target state */
 		ret = arch_pwrdm->pwrdm_set_next_pwrst(pwrdm, pwrst);
+		if (!ret)
+			pwrdm_cache_write(pwrdm, PWRDM_CACHE_NEXT_PWRST, pwrst);
 	}
 
 	return ret;

@@ -869,13 +871,19 @@ int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
  */
 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
 {
-	int ret = -EINVAL;
+	int pwrst, ret = -EINVAL;
 
 	if (!pwrdm)
 		return -EINVAL;
 
-	if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst)
+	if (!pwrdm_cache_read(pwrdm, PWRDM_CACHE_NEXT_PWRST, &pwrst))
+		return pwrst;
+
+	if (arch_pwrdm && arch_pwrdm->pwrdm_read_next_pwrst) {
 		ret = arch_pwrdm->pwrdm_read_next_pwrst(pwrdm);
+		if (ret >= 0)
+			pwrdm_cache_write(pwrdm, PWRDM_CACHE_NEXT_PWRST, ret);
+	}
 
 	return ret;
 }

@@ -906,13 +914,19 @@ int pwrdm_read_next_func_pwrst(struct powerdomain *pwrdm)
  */
 int pwrdm_read_pwrst(struct powerdomain *pwrdm)
 {
-	int ret = -EINVAL;
+	int pwrst, ret = -EINVAL;
 
 	if (!pwrdm)
 		return -EINVAL;
 
-	if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst)
+	if (!pwrdm_cache_read(pwrdm, PWRDM_CACHE_PWRST, &pwrst))
+		return pwrst;
+
+	if (arch_pwrdm && arch_pwrdm->pwrdm_read_pwrst) {
 		ret = arch_pwrdm->pwrdm_read_pwrst(pwrdm);
+		if (ret >= 0)
+			pwrdm_cache_write(pwrdm, PWRDM_CACHE_PWRST, ret);
+	}