From: Jean Pihet <j-pihet@xxxxxx>
The powerdomains next states are initialized in pwrdms_setup as a
late_initcall. Because the wake-up constraint can be requested
early in the boot sequence, the power domains next states can be
overwritten by pwrdms_setup.
This patch fixes it by initializing the power domains next states
early at boot, so that the constraints can be applied.
Later in the pwrdms_setup function the currently programmed
next states are re-used as next state values.
Applies to OMAP3 and OMAP4.
Tested on OMAP3 Beagleboard in RET/OFF using wake-up latency constraints
on MPU, CORE and PER.
Signed-off-by: Jean Pihet <j-pihet@xxxxxx>
---
arch/arm/mach-omap2/pm34xx.c | 2 +-
arch/arm/mach-omap2/pm44xx.c | 2 +-
arch/arm/mach-omap2/powerdomain.c | 5 +++++
3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 0c5e3a4..8d202a7 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -840,7 +840,7 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
if (!pwrst)
return -ENOMEM;
pwrst->pwrdm = pwrdm;
- pwrst->next_state = PWRDM_POWER_RET;
+ pwrst->next_state = pwrdm_read_next_pwrst(pwrdm);
list_add(&pwrst->node, &pwrst_list);
if (pwrdm_has_hdwr_sar(pwrdm))
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index 59a870b..049efe9 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -84,7 +84,7 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
if (!pwrst)
return -ENOMEM;
pwrst->pwrdm = pwrdm;
- pwrst->next_state = PWRDM_POWER_ON;
+ pwrdm->state = pwrdm_read_pwrst(pwrdm);
list_add(&pwrst->node, &pwrst_list);
return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 9860630..3294707 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -78,6 +78,7 @@ static struct powerdomain *_pwrdm_lookup(const char *name)
static int _pwrdm_register(struct powerdomain *pwrdm)
{
int i;
+ int next_state = PWRDM_POWER_RET;
if (!pwrdm || !pwrdm->name)
return -EINVAL;
@@ -114,6 +115,10 @@ static int _pwrdm_register(struct powerdomain *pwrdm)
pwrdm_wait_transition(pwrdm);
pwrdm->state = pwrdm_read_pwrst(pwrdm);
pwrdm->state_counter[pwrdm->state] = 1;
+ /* Early init of the next power state */
+ if (cpu_is_omap44xx())
+ next_state = PWRDM_POWER_ON;
+ pwrdm_set_next_pwrst(pwrdm, next_state);
pr_debug("powerdomain: registered %s\n", pwrdm->name);
--
1.7.2.5
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