From: Chanwoo Choi <cw00.choi@samsung.com>
Date: Fri, 11 Jul 2014 01:02:06 +0000 (+0900)
Subject: pm_qos: Add PM_QOS_BUS_FREQUENCY pm_qos to guarantee required memory bus frequency
X-Git-Tag: submit/tizen/20141121.110247~433
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f471a72bd63710b7491a7695fc4913b23b0520b0;p=platform%2Fkernel%2Flinux-3.10.git

pm_qos: Add PM_QOS_BUS_FREQUENCY pm_qos to guarantee required memory bus frequency

This patch add PM_QOS_BUS_FREQUENCY pm_qos to guarantee required memory bus
frequency.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---

diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index 5a95013..caa4e98 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -15,6 +15,7 @@ enum {
 	PM_QOS_CPU_DMA_LATENCY,
 	PM_QOS_NETWORK_LATENCY,
 	PM_QOS_NETWORK_THROUGHPUT,
+	PM_QOS_BUS_FREQUENCY,
 
 	/* insert new class ID */
 	PM_QOS_NUM_CLASSES,
@@ -34,6 +35,11 @@ enum pm_qos_flags_status {
 #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE	0
 #define PM_QOS_DEV_LAT_DEFAULT_VALUE		0
 
+#define PM_QOS_DEV_LAT_DEFAULT_VALUE		0
+#define PM_QOS_BUS_FREQUENCY_MAX_VALUE		400000
+#define PM_QOS_BUS_FREQUENCY_MIN_VALUE		100000
+#define PM_QOS_BUS_FREQUENCY_DEFAULT_VALUE	PM_QOS_BUS_FREQUENCY_MIN_VALUE
+
 #define PM_QOS_FLAG_NO_POWER_OFF	(1 << 0)
 #define PM_QOS_FLAG_REMOTE_WAKEUP	(1 << 1)
 
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 25cf89b..789e69f 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -100,12 +100,25 @@ static struct pm_qos_object network_throughput_pm_qos = {
 	.name = "network_throughput",
 };
 
+static BLOCKING_NOTIFIER_HEAD(bus_frequency_notifier);
+static struct pm_qos_constraints bus_frequency_constraints = {
+	.list = PLIST_HEAD_INIT(bus_frequency_constraints.list),
+	.target_value = PM_QOS_BUS_FREQUENCY_DEFAULT_VALUE,
+	.default_value = PM_QOS_BUS_FREQUENCY_DEFAULT_VALUE,
+	.type = PM_QOS_MAX,
+	.notifiers = &bus_frequency_notifier,
+};
+static struct pm_qos_object bus_frequency_pm_qos = {
+	.constraints = &bus_frequency_constraints,
+	.name = "bus_frequency",
+};
 
 static struct pm_qos_object *pm_qos_array[] = {
 	&null_pm_qos,
 	&cpu_dma_pm_qos,
 	&network_lat_pm_qos,
-	&network_throughput_pm_qos
+	&network_throughput_pm_qos,
+	&bus_frequency_pm_qos,
 };
 
 static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,