OMAP: PM constraints: add return values; add requesting device param to omap_pm_set_max_dev_wakeup_lat()

Add return values to the PM constraint functions.  This allows the PM
core to provide feedback to the caller if a constraint is not
possible.  Update the one upstream user of omap_pm_set_max_mpu_wakeup_lat()
to add a compatibility wrapper, needed until the driver is changed.

Update some of the documentation to conform more closely to kerneldoc style.

Add an additional device parameter to omap_pm_set_max_dev_wakeup_lat()
to identify the device requesting the constraint.  This is so repeated calls
to omap_pm_set_max_dev_wakeup_lat() with the same requesting device can
override the device's previously-set constraint.  Also, it allows the PM
core to make a decision as to whether or not the constraint should be
satisfied, based on the caller's identity.

Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 21 insertions, 13 deletions

diff --git a/arch/arm/plat-omap/omap-pm-noop.c b/arch/arm/plat-omap/omap-pm-noop.c
index 186bca82cfab..b0414f90c6e3 100644
--- a/arch/arm/plat-omap/omap-pm-noop.c
+++ b/arch/arm/plat-omap/omap-pm-noop.c
@@ -34,11 +34,11 @@ struct omap_opp *l3_opps;
  * Device-driver-originated constraints (via board-*.c files)
  */
 
-void omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
+int omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
 {
 	if (!dev || t < -1) {
-		WARN_ON(1);
-		return;
+		WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
+		return -EINVAL;
 	};
 
 	if (t == -1)
@@ -58,14 +58,16 @@ void omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
 	 *
 	 * TI CDP code can call constraint_set here.
 	 */
+
+	return 0;
 }
 
-void omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
+int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
 {
 	if (!dev || (agent_id != OCP_INITIATOR_AGENT &&
 	    agent_id != OCP_TARGET_AGENT)) {
-		WARN_ON(1);
-		return;
+		WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
+		return -EINVAL;
 	};
 
 	if (r == 0)
@@ -83,13 +85,16 @@ void omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
 	 *
 	 * TI CDP code can call constraint_set here on the VDD2 OPP.
 	 */
+
+	return 0;
 }
 
-void omap_pm_set_max_dev_wakeup_lat(struct device *dev, long t)
+int omap_pm_set_max_dev_wakeup_lat(struct device *req_dev, struct device *dev,
+				   long t)
 {
-	if (!dev || t < -1) {
-		WARN_ON(1);
-		return;
+	if (!req_dev || !dev || t < -1) {
+		WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
+		return -EINVAL;
 	};
 
 	if (t == -1)
@@ -111,13 +116,15 @@ void omap_pm_set_max_dev_wakeup_lat(struct device *dev, long t)
 	 *
 	 * TI CDP code can call constraint_set here.
 	 */
+
+	return 0;
 }
 
-void omap_pm_set_max_sdma_lat(struct device *dev, long t)
+int omap_pm_set_max_sdma_lat(struct device *dev, long t)
 {
 	if (!dev || t < -1) {
-		WARN_ON(1);
-		return;
+		WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
+		return -EINVAL;
 	};
 
 	if (t == -1)
@@ -139,6 +146,7 @@ void omap_pm_set_max_sdma_lat(struct device *dev, long t)
 	 * TI CDP code can call constraint_set here.
 	 */
 
+	return 0;
 }