[linux-pm] [PATCH 05/11] OMAP PM: early init of the pwrdms states

[jean.pihet at newoldbits.com]

From: Jean Pihet <j-pihet at ti.com>

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 and OMAP4 Pandaboard in RET/OFF using
wake-up latency constraints on MPU, CORE and PER.

Signed-off-by: Jean Pihet <j-pihet at ti.com>
---
 arch/arm/mach-omap2/pm34xx.c      |    2 +-
 arch/arm/mach-omap2/pm44xx.c      |    2 +-
 arch/arm/mach-omap2/powerdomain.c |    3 +++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index c155c9d..0b0a842 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -828,7 +828,7 @@ 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..91ede72 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;
+	pwrst->next_state = pwrdm_read_next_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 9af0847..63c3e7a 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -108,6 +108,9 @@ static int _pwrdm_register(struct powerdomain *pwrdm)
 	pwrdm->state = pwrdm_read_pwrst(pwrdm);
 	pwrdm->state_counter[pwrdm->state] = 1;
 
+	/* Early init of the next power state */
+	pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_RET);
+
 	pr_debug("powerdomain: registered %s\n", pwrdm->name);
 
 	return 0;
-- 
1.7.4.1