OMAP3: PM: Emu_pwrdm is switched off by hardware even when sdti is in use

Using sdti doesn't keep emu_pwrdm on if hardware supervised pwrdm
transitions are used. This causes sdti stop to work when power
management is initialized and hardware supervised pwrdm control is
enabled. This patch disables hardware supervised pwrdm control for
emu_pwrdm. Now emu_pwrdm is switched off on boot by software when it
is not used.
Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/clockdomains.h

@@ -251,10 +251,14 @@ static struct clockdomain per_clkdm = {
 	.omap_chip	= OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
 };
 
+/*
+ * Disable hw supervised mode for emu_clkdm, because emu_pwrdm is
+ * switched of even if sdti is in use
+ */
 static struct clockdomain emu_clkdm = {
 	.name		= "emu_clkdm",
 	.pwrdm		= { .name = "emu_pwrdm" },
-	.flags		= CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_SWSUP,
+	.flags		= /* CLKDM_CAN_ENABLE_AUTO |  */CLKDM_CAN_SWSUP,
 	.clktrctrl_mask = OMAP3430_CLKTRCTRL_EMU_MASK,
 	.omap_chip	= OMAP_CHIP_INIT(CHIP_IS_OMAP3430),
 };

arch/arm/mach-omap2/pm34xx.c

@@ -605,9 +605,18 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm)
 	return set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 }
 
+/*
+ * Enable hw supervised mode for all clockdomains if it's
+ * supported. Initiate sleep transition for other clockdomains, if
+ * they are not used
+ */
 static int __init clkdms_setup(struct clockdomain *clkdm)
 {
-	omap2_clkdm_allow_idle(clkdm);
+	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
+		omap2_clkdm_allow_idle(clkdm);
+	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
+		 atomic_read(&clkdm->usecount) == 0)
+		omap2_clkdm_sleep(clkdm);
 	return 0;
 }