ARM: OMAP2+: clockdomain/hwmod: add workaround for EMU clockdomain idle problems

[linux-block.git] / arch / arm / mach-omap2 / clockdomain.h

diff --git a/arch/arm/mach-omap2/clockdomain.h b/arch/arm/mach-omap2/clockdomain.h
index 5601dc13785ed606f0ce1bdf562472270489811a..629576be74445419fbc815fdfd8861cd2190943a 100644 (file)
--- a/arch/arm/mach-omap2/clockdomain.h
+++ b/arch/arm/mach-omap2/clockdomain.h
@@ -1,9 +1,7 @@
 /*
- * arch/arm/plat-omap/include/mach/clockdomain.h
- *
  * OMAP2/3 clockdomain framework functions
  *
- * Copyright (C) 2008 Texas Instruments, Inc.
+ * Copyright (C) 2008, 2012 Texas Instruments, Inc.
  * Copyright (C) 2008-2011 Nokia Corporation
  *
  * Paul Walmsley
@@ -34,6 +32,20 @@
  * CLKDM_ACTIVE_WITH_MPU: The PRCM guarantees that this clockdomain is
  *     active whenever the MPU is active.  True for interconnects and
  *     the WKUP clockdomains.
+ * CLKDM_MISSING_IDLE_REPORTING: The idle status of the IP blocks and
+ *     clocks inside this clockdomain are not taken into account by
+ *     the PRCM when determining whether the clockdomain is idle.
+ *     Without this flag, if the clockdomain is set to
+ *     hardware-supervised idle mode, the PRCM may transition the
+ *     enclosing powerdomain to a low power state, even when devices
+ *     inside the clockdomain and powerdomain are in use.  (An example
+ *     of such a clockdomain is the EMU clockdomain on OMAP3/4.)  If
+ *     this flag is set, and the clockdomain does not support the
+ *     force-sleep mode, then the HW_AUTO mode will be used to put the
+ *     clockdomain to sleep.  Similarly, if the clockdomain supports
+ *     the force-wakeup mode, then it will be used whenever a clock or
+ *     IP block inside the clockdomain is active, rather than the
+ *     HW_AUTO mode.
  */
 #define CLKDM_CAN_FORCE_SLEEP                  (1 << 0)
 #define CLKDM_CAN_FORCE_WAKEUP                 (1 << 1)
@@ -41,6 +53,7 @@
 #define CLKDM_CAN_DISABLE_AUTO                 (1 << 3)
 #define CLKDM_NO_AUTODEPS                      (1 << 4)
 #define CLKDM_ACTIVE_WITH_MPU                  (1 << 5)
+#define CLKDM_MISSING_IDLE_REPORTING           (1 << 6)
 
 #define CLKDM_CAN_HWSUP                (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
 #define CLKDM_CAN_SWSUP                (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
@@ -187,6 +200,7 @@ int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm);
 void clkdm_allow_idle(struct clockdomain *clkdm);
 void clkdm_deny_idle(struct clockdomain *clkdm);
 bool clkdm_in_hwsup(struct clockdomain *clkdm);
+bool clkdm_missing_idle_reporting(struct clockdomain *clkdm);
 
 int clkdm_wakeup(struct clockdomain *clkdm);
 int clkdm_sleep(struct clockdomain *clkdm);