The OMAP PM code implements a handler for the per-device PM QoS framework.
The handler queries the omap_hwmod layer in order to manage the power domains
wake-up latency constraints. Hwmod retrieves the correct power domain
and if it exists it calls the corresponding power domain function.
Tested on OMAP3 Beagleboard and OMAP4 Pandaboard in RET/OFF using wake-up
latency constraints on MPU, CORE and PER.
Signed-off-by: Jean Pihet <j-pihet@xxxxxx>
Reviewed-by: Kevin Hilman <khilman@xxxxxx>
[paul@xxxxxxxxx: cleaned some documentation; split set/remove constraint
functions; modified to return -EINVAL until underlying code is ready]
Signed-off-by: Paul Walmsley <paul@xxxxxxxxx>
---
arch/arm/mach-omap2/omap_hwmod.c | 54 +++++++++++++++++++++++++-
arch/arm/plat-omap/include/plat/omap_hwmod.h | 5 ++
2 files changed, 58 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index bf86f7e..cc173d9 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -145,6 +145,7 @@
#include "powerdomain.h"
#include <plat/clock.h>
#include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
#include <plat/prcm.h>
#include "cm2xxx_3xxx.h"
@@ -3301,10 +3302,61 @@ ohsps_unlock:
}
/**
+ * omap_hwmod_set_wakeuplat_constraint - set/release a wake-up latency
+ * constraint
+ * @oh: struct omap_hwmod* to which the target device belongs to.
+ * @cookie: identifier of the constraints list for @oh.
+ * @min_latency: the minimum allowed wake-up latency for @oh.
+ *
+ * Sets a wakeup latency contraint. (To remove a wakeup latency
+ * constraint, call omap_hwmod_remove_wakeuplat_constraint()).
+ * Returns the return value from pwrdm_wakeuplat_remove_constraint(),
+ * or -EINVAL in case of invalid parameters.
+ */
+int omap_hwmod_set_wakeuplat_constraint(struct omap_hwmod *oh, void *cookie,
+ long min_latency)
+{
+ struct powerdomain *pwrdm = omap_hwmod_get_pwrdm(oh);
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ /*
+ * XXX Update to use pwrdm_wakeuplat_update_constraint() when
+ * that code is ready
+ */
+ return -EINVAL;
+}
+
+/**
+ * omap_hwmod_remove_wakeuplat_constraint - release a wake-up latency
+ * constraint
+ * @oh: struct omap_hwmod* to which the target device belongs to.
+ * @cookie: identifier of the constraints list for @oh.
+ *
+ * Removes a wakeup latency contraint. Returns the return value from
+ * pwrdm_wakeuplat_update_constraint(), or -EINVAL in case of invalid
+ * parameters.
+ */
+int omap_hwmod_remove_wakeuplat_constraint(struct omap_hwmod *oh, void *cookie)
+{
+ struct powerdomain *pwrdm = omap_hwmod_get_pwrdm(oh);
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ /*
+ * XXX Update to use pwrdm_wakeuplat_remove_constraint() when
+ * that code is ready
+ */
+ return -EINVAL;
+}
+
+/**
* omap_hwmod_get_context_loss_count - get lost context count
* @oh: struct omap_hwmod *
*
- * Query the powerdomain of of @oh to get the context loss
+ * Query the powerdomain of @oh to get the context loss
* count for this device.
*
* Returns the context loss count of the powerdomain assocated with @oh
diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index c835b71..3aa10df 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -623,6 +623,11 @@ int omap_hwmod_for_each_by_class(const char *classname,
void *user);
int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state);
+
+int omap_hwmod_set_wakeuplat_constraint(struct omap_hwmod *oh, void *cookie,
+ long min_latency);
+int omap_hwmod_remove_wakeuplat_constraint(struct omap_hwmod *oh, void *cookie);
+
int omap_hwmod_get_context_loss_count(struct omap_hwmod *oh);
int omap_hwmod_no_setup_reset(struct omap_hwmod *oh);
--
1.7.7.6
--
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