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authorJean Pihet <j-pihet@ti.com>2011-05-09 14:02:16 +0400
committerKevin Hilman <khilman@ti.com>2011-05-20 19:15:54 +0400
commit04908918191f7926ec7af99890fb4ddb3b769c13 (patch)
tree96a531896df79761459d6f10735a5aa85b484a31 /arch/arm/mach-omap2/cpuidle34xx.c
parentc6cd91de1cb4694f2dfcc7df831e276fffdffffc (diff)
downloadlinux-04908918191f7926ec7af99890fb4ddb3b769c13.tar.xz
OMAP3: cpuidle: change the power domains modes determination logic
The achievable power modes of the power domains in cpuidle depends on the system wide 'enable_off_mode' knob in debugfs. Upon changing enable_off_mode, do not change the C-states 'valid' field but instead dynamically restrict the power modes when entering idle. The C-states 'valid' field is just used to enable/disable some C-states at init and shall not be changed later on. Signed-off-by: Jean Pihet <j-pihet@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/cpuidle34xx.c')
-rw-r--r--arch/arm/mach-omap2/cpuidle34xx.c58
1 files changed, 24 insertions, 34 deletions
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c
index dd31e539274c..4bf6e6e8b100 100644
--- a/arch/arm/mach-omap2/cpuidle34xx.c
+++ b/arch/arm/mach-omap2/cpuidle34xx.c
@@ -138,22 +138,40 @@ return_sleep_time:
}
/**
- * next_valid_state - Find next valid c-state
+ * next_valid_state - Find next valid C-state
* @dev: cpuidle device
- * @state: Currently selected c-state
+ * @state: Currently selected C-state
*
* If the current state is valid, it is returned back to the caller.
* Else, this function searches for a lower c-state which is still
* valid.
+ *
+ * A state is valid if the 'valid' field is enabled and
+ * if it satisfies the enable_off_mode condition.
*/
static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
struct cpuidle_state *curr)
{
struct cpuidle_state *next = NULL;
struct omap3_idle_statedata *cx = cpuidle_get_statedata(curr);
+ u32 mpu_deepest_state = PWRDM_POWER_RET;
+ u32 core_deepest_state = PWRDM_POWER_RET;
+
+ if (enable_off_mode) {
+ mpu_deepest_state = PWRDM_POWER_OFF;
+ /*
+ * Erratum i583: valable for ES rev < Es1.2 on 3630.
+ * CORE OFF mode is not supported in a stable form, restrict
+ * instead the CORE state to RET.
+ */
+ if (!IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583))
+ core_deepest_state = PWRDM_POWER_OFF;
+ }
/* Check if current state is valid */
- if (cx->valid) {
+ if ((cx->valid) &&
+ (cx->mpu_state >= mpu_deepest_state) &&
+ (cx->core_state >= core_deepest_state)) {
return curr;
} else {
int idx = OMAP3_NUM_STATES - 1;
@@ -176,7 +194,9 @@ static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
idx--;
for (; idx >= 0; idx--) {
cx = cpuidle_get_statedata(&dev->states[idx]);
- if (cx->valid) {
+ if ((cx->valid) &&
+ (cx->mpu_state >= mpu_deepest_state) &&
+ (cx->core_state >= core_deepest_state)) {
next = &dev->states[idx];
break;
}
@@ -259,31 +279,6 @@ select_state:
DEFINE_PER_CPU(struct cpuidle_device, omap3_idle_dev);
-/**
- * omap3_cpuidle_update_states() - Update the cpuidle states
- * @mpu_deepest_state: Enable states up to and including this for mpu domain
- * @core_deepest_state: Enable states up to and including this for core domain
- *
- * This goes through the list of states available and enables and disables the
- * validity of C states based on deepest state that can be achieved for the
- * variable domain
- */
-void omap3_cpuidle_update_states(u32 mpu_deepest_state, u32 core_deepest_state)
-{
- int i;
-
- for (i = 0; i < OMAP3_NUM_STATES; i++) {
- struct omap3_idle_statedata *cx = &omap3_idle_data[i];
-
- if ((cx->mpu_state >= mpu_deepest_state) &&
- (cx->core_state >= core_deepest_state)) {
- cx->valid = 1;
- } else {
- cx->valid = 0;
- }
- }
-}
-
void omap3_pm_init_cpuidle(struct cpuidle_params *cpuidle_board_params)
{
int i;
@@ -393,11 +388,6 @@ int __init omap3_idle_init(void)
cx->mpu_state = PWRDM_POWER_OFF;
cx->core_state = PWRDM_POWER_OFF;
- if (enable_off_mode)
- omap3_cpuidle_update_states(PWRDM_POWER_OFF, PWRDM_POWER_OFF);
- else
- omap3_cpuidle_update_states(PWRDM_POWER_RET, PWRDM_POWER_RET);
-
dev->state_count = OMAP3_NUM_STATES;
if (cpuidle_register_device(dev)) {
printk(KERN_ERR "%s: CPUidle register device failed\n",