OMAP4: PM: Use the low-power state change feature on OMAP4

For pwrdm's which support LOWPOWERSTATECHANGE, do not try waking
up the domain to put it back to deeper sleep state.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Benoit Cousson <b-cousson@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 22 insertions, 6 deletions

diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 227a211921c3..a2b826cdfbf6 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -89,6 +89,10 @@ static void omap2_init_processor_devices(void)
         }
 }
 
+/* Types of sleep_switch used in omap_set_pwrdm_state */
+#define FORCEWAKEUP_SWITCH      0
+#define LOWPOWERSTATE_SWITCH    1
+
 /*
  * This sets pwrdm state (other than mpu & core. Currently only ON &
  * RET are supported. Function is assuming that clkdm doesn't have
@@ -114,9 +118,14 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
                 return ret;
 
         if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
-                omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
-                sleep_switch = 1;
-                pwrdm_wait_transition(pwrdm);
+                if ((pwrdm_read_pwrst(pwrdm) > state) &&
+                        (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
+                        sleep_switch = LOWPOWERSTATE_SWITCH;
+                } else {
+                        omap2_clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
+                        pwrdm_wait_transition(pwrdm);
+                        sleep_switch = FORCEWAKEUP_SWITCH;
+                }
         }
 
         ret = pwrdm_set_next_pwrst(pwrdm, state);
@@ -126,12 +135,19 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
                 goto err;
         }
 
-        if (sleep_switch) {
+        switch (sleep_switch) {
+        case FORCEWAKEUP_SWITCH:
                 omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
-                pwrdm_wait_transition(pwrdm);
-                pwrdm_state_switch(pwrdm);
+                break;
+        case LOWPOWERSTATE_SWITCH:
+                pwrdm_set_lowpwrstchange(pwrdm);
+                break;
+        default:
+                return ret;
         }
 
+        pwrdm_wait_transition(pwrdm);
+        pwrdm_state_switch(pwrdm);
 err:
         return ret;
 }