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From cec133850aa42c03d912c764aaa441677e782eca Mon Sep 17 00:00:00 2001
From: Rajendra Nayak <rnayak@ti.com>
Date: Tue, 5 Apr 2011 15:22:48 +0530
Subject: [PATCH 4/6] OMAP2+: PM: idle clkdms only if already in idle
The omap_set_pwrdm_state function forces clockdomains
to idle, without checking the existing idle state
programmed, instead based solely on the HW capability
of the clockdomain to support idle.
This is wrong and the clockdomains should be idled
post a state_switch *only* if idle transitions on the
clockdomain were already enabled.
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
---
arch/arm/mach-omap2/pm.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index d48813f..840b0e1 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -108,6 +108,7 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
u32 cur_state;
int sleep_switch = -1;
int ret = 0;
+ int hwsup = 0;
if (pwrdm == NULL || IS_ERR(pwrdm))
return -EINVAL;
@@ -127,6 +128,7 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
sleep_switch = LOWPOWERSTATE_SWITCH;
} else {
+ hwsup = clkdm_is_idle(pwrdm->pwrdm_clkdms[0]);
clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
pwrdm_wait_transition(pwrdm);
sleep_switch = FORCEWAKEUP_SWITCH;
@@ -142,7 +144,7 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
switch (sleep_switch) {
case FORCEWAKEUP_SWITCH:
- if (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO)
+ if (hwsup)
clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
else
clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
--
1.6.6.1
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