---

yaml
---
r: 226587
b: refs/heads/master
c: bd36179
h: refs/heads/master
i:
  226585: 176624d
  226583: 8b881aa
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2092e5ccf89db09ebde94e9aabd3c86d5fa05c6c
+refs/heads/master: bd36179eec2827cd60b4a8c6e180cc030c74a4ec

trunk/arch/arm/mach-omap2/omap_hwmod.c

@@ -1089,7 +1089,7 @@ static int _read_hardreset(struct omap_hwmod *oh, const char *name)
 }
 
 /**
- * _reset - reset an omap_hwmod
+ * _ocp_softreset - reset an omap_hwmod via the OCP_SYSCONFIG bit
  * @oh: struct omap_hwmod *
  *
  * Resets an omap_hwmod @oh via the OCP_SYSCONFIG bit.  hwmod must be
@@ -1098,12 +1098,13 @@ static int _read_hardreset(struct omap_hwmod *oh, const char *name)
  * the module did not reset in time, or 0 upon success.
  *
  * In OMAP3 a specific SYSSTATUS register is used to get the reset status.
- * Starting in OMAP4, some IPs does not have SYSSTATUS register and instead
+ * Starting in OMAP4, some IPs do not have SYSSTATUS registers and instead
  * use the SYSCONFIG softreset bit to provide the status.
  *
- * Note that some IP like McBSP does have a reset control but no reset status.
+ * Note that some IP like McBSP do have reset control but don't have
+ * reset status.
  */
-static int _reset(struct omap_hwmod *oh)
+static int _ocp_softreset(struct omap_hwmod *oh)
 {
 	u32 v;
 	int c = 0;
@@ -1124,7 +1125,7 @@ static int _reset(struct omap_hwmod *oh)
 	if (oh->flags & HWMOD_CONTROL_OPT_CLKS_IN_RESET)
 		_enable_optional_clocks(oh);
 
-	pr_debug("omap_hwmod: %s: resetting\n", oh->name);
+	pr_debug("omap_hwmod: %s: resetting via OCP SOFTRESET\n", oh->name);
 
 	v = oh->_sysc_cache;
 	ret = _set_softreset(oh, &v);
@@ -1163,6 +1164,33 @@ static int _reset(struct omap_hwmod *oh)
 	return ret;
 }
 
+/**
+ * _reset - reset an omap_hwmod
+ * @oh: struct omap_hwmod *
+ *
+ * Resets an omap_hwmod @oh.  The default software reset mechanism for
+ * most OMAP IP blocks is triggered via the OCP_SYSCONFIG.SOFTRESET
+ * bit.  However, some hwmods cannot be reset via this method: some
+ * are not targets and therefore have no OCP header registers to
+ * access; others (like the IVA) have idiosyncratic reset sequences.
+ * So for these relatively rare cases, custom reset code can be
+ * supplied in the struct omap_hwmod_class .reset function pointer.
+ * Passes along the return value from either _reset() or the custom
+ * reset function - these must return -EINVAL if the hwmod cannot be
+ * reset this way or if the hwmod is in the wrong state, -ETIMEDOUT if
+ * the module did not reset in time, or 0 upon success.
+ */
+static int _reset(struct omap_hwmod *oh)
+{
+	int ret;
+
+	pr_debug("omap_hwmod: %s: resetting\n", oh->name);
+
+	ret = (oh->class->reset) ? oh->class->reset(oh) : _ocp_softreset(oh);
+
+	return ret;
+}
+
 /**
  * _omap_hwmod_enable - enable an omap_hwmod
  * @oh: struct omap_hwmod *

trunk/arch/arm/plat-omap/include/plat/omap_hwmod.h

@@ -364,7 +364,7 @@ struct omap_hwmod_omap4_prcm {
  *     when module is enabled, rather than the default, which is to
  *     enable autoidle
  * HWMOD_SET_DEFAULT_CLOCKACT: program CLOCKACTIVITY bits at startup
- * HWMOD_NO_IDLEST : this module does not have idle status - this is the case
+ * HWMOD_NO_IDLEST: this module does not have idle status - this is the case
  *     only for few initiator modules on OMAP2 & 3.
  * HWMOD_CONTROL_OPT_CLKS_IN_RESET: Enable all optional clocks during reset.
  *     This is needed for devices like DSS that require optional clocks enabled
@@ -416,6 +416,7 @@ struct omap_hwmod_omap4_prcm {
  * @sysc: device SYSCONFIG/SYSSTATUS register data
  * @rev: revision of the IP class
  * @pre_shutdown: ptr to fn to be executed immediately prior to device shutdown
+ * @reset: ptr to fn to be executed in place of the standard hwmod reset fn
  *
  * Represent the class of a OMAP hardware "modules" (e.g. timer,
  * smartreflex, gpio, uart...)
@@ -427,12 +428,18 @@ struct omap_hwmod_omap4_prcm {
  * or some negative error upon failure.  Returning an error will cause
  * omap_hwmod_shutdown() to abort the device shutdown and return an
  * error.
+ *
+ * If @reset is defined, then the function it points to will be
+ * executed in place of the standard hwmod _reset() code in
+ * mach-omap2/omap_hwmod.c.  This is needed for IP blocks which have
+ * unusual reset sequences - usually processor IP blocks like the IVA.
  */
 struct omap_hwmod_class {
 	const char				*name;
 	struct omap_hwmod_class_sysconfig	*sysc;
 	u32					rev;
 	int					(*pre_shutdown)(struct omap_hwmod *oh);
+	int					(*reset)(struct omap_hwmod *oh);
 };
 
 /**