u8 mpu_state;
u8 core_state;
u8 per_min_state;
+ u8 flags;
};
static struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd;
/*
+ * Possible flag bits for struct omap3_idle_statedata.flags:
+ *
+ * OMAP_CPUIDLE_CX_NO_CLKDM_IDLE: don't allow the MPU clockdomain to go
+ * inactive. This in turn prevents the MPU DPLL from entering autoidle
+ * mode, so wakeup latency is greatly reduced, at the cost of additional
+ * energy consumption. This also prevents the CORE clockdomain from
+ * entering idle.
+ */
+#define OMAP_CPUIDLE_CX_NO_CLKDM_IDLE BIT(0)
+
+/*
* Prevent PER OFF if CORE is not in RETention or OFF as this would
* disable PER wakeups completely.
*/
.core_state = PWRDM_POWER_ON,
/* In C1 do not allow PER state lower than CORE state */
.per_min_state = PWRDM_POWER_ON,
+ .flags = OMAP_CPUIDLE_CX_NO_CLKDM_IDLE,
},
{
.mpu_state = PWRDM_POWER_ON,
int index)
{
struct omap3_idle_statedata *cx = &omap3_idle_data[index];
- u32 mpu_state = cx->mpu_state, core_state = cx->core_state;
local_fiq_disable();
- pwrdm_set_next_pwrst(mpu_pd, mpu_state);
- pwrdm_set_next_pwrst(core_pd, core_state);
-
if (omap_irq_pending() || need_resched())
goto return_sleep_time;
/* Deny idle for C1 */
- if (index == 0) {
+ if (cx->flags & OMAP_CPUIDLE_CX_NO_CLKDM_IDLE) {
clkdm_deny_idle(mpu_pd->pwrdm_clkdms[0]);
- clkdm_deny_idle(core_pd->pwrdm_clkdms[0]);
+ } else {
+ pwrdm_set_next_pwrst(mpu_pd, cx->mpu_state);
+ pwrdm_set_next_pwrst(core_pd, cx->core_state);
}
/*
* Call idle CPU PM enter notifier chain so that
* VFP context is saved.
*/
- if (mpu_state == PWRDM_POWER_OFF)
+ if (cx->mpu_state == PWRDM_POWER_OFF)
cpu_pm_enter();
/* Execute ARM wfi */
* Call idle CPU PM enter notifier chain to restore
* VFP context.
*/
- if (pwrdm_read_prev_pwrst(mpu_pd) == PWRDM_POWER_OFF)
+ if (cx->mpu_state == PWRDM_POWER_OFF &&
+ pwrdm_read_prev_pwrst(mpu_pd) == PWRDM_POWER_OFF)
cpu_pm_exit();
/* Re-allow idle for C1 */
- if (index == 0) {
+ if (cx->flags & OMAP_CPUIDLE_CX_NO_CLKDM_IDLE)
clkdm_allow_idle(mpu_pd->pwrdm_clkdms[0]);
- clkdm_allow_idle(core_pd->pwrdm_clkdms[0]);
- }
return_sleep_time:
-
local_fiq_enable();
return index;
* Start search from the next (lower) state.
*/
for (idx = index - 1; idx >= 0; idx--) {
- cx = &omap3_idle_data[idx];
+ cx = &omap3_idle_data[idx];
if ((cx->mpu_state >= mpu_deepest_state) &&
(cx->core_state >= core_deepest_state)) {
next_index = idx;