ux500: pm: add use-case governor

Signed-off-by: Vincent Guittot <vincent.guittot@stericsson.com>
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>

[ANDROID]: ux500: pm: update sysfs interface for usecase governor

A separate sysfs node is added fro each use-case. It is now possible to enable
multiple use-cases simultaneously. If multiple use-cases are enabled, each
configuration (of all enabled uses-caes)  is compared and the configuration
which is requesting highest performance is selected.

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>

[ANDROID]: ux500: pm: usecase-gov Act on interrupts per s

If the number of interrupts per seconds are above
a certain level, exit from the asked mode.

[ANDROID]: ux500: pm: update low-power-audio config in usecse-governor

Update low-power-audio configuration to plug-out second cpu. This makes auto,
voice-call and low-power-audio configurations to be same. Auto mode is activated
by default (without any user space interaction). This makes voice-call and
low-power-audio configurations redundant. However, analysis work is still on
going for adding other settings that may become part of usecase governor so
keeping all configurations in there for now.

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>

[ANDROID]: ux500: pm: update usecase governor dependencies in Kconfig

[ANDROID]: ARM: ux500: pm: usecase gov depends on PM

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>

[ANDROID]: ux500: pm: minor code cleanup in UC governor

Signed-off-by: Martin Persson <martin.persson@stericsson.com>

[ANDROID] ux500: pm: disable auto mode in usecase governor

In absence of auto mode there is no need to schedule work on early suspend
so schedule work only when needed.

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>

[ANDROID]: pm: force ondemand governor to choose higher frequency

In stead of overriding frequency selected by ondemand governor in
u8500_cpufreq_target(), force ondemand governor to select higher frequency when
wlan and usb workaround is enabled.
ANDROID tag is used to keep the patch internal. Otherwise it does not have any
Android dependency.

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>

[ANDROID]: ARM: u8500: usecaseg: Tiny code clean-up

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>

arm: ux500: halve the frequencies of some clocks in vc use case

This patch adds a new APE OPP (50% with ACLK and DMACLK frequencies
at 25%) which is used during the voice call use case.

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Signed-off-by: Mattias Nilsson <mattias.i.nilsson@stericsson.com>

ux500: pm: Add min cpufreq to UC governor

Add a minimum cpu frequency limit to each use case
in the use case governor.

Signed-off-by: Martin Persson <martin.persson@stericsson.com>

ux500: pm: allow usecase governor to force cpu idle states
Also update low-power-audio configuration to force ApSleep state.

ux500: pm: move use case definitions to a header file
ux500: pm: add pl310 prefetch control in use-case governor
ux500: pm: cosmetic changes in use-case governor

Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>

1 files changed, 38 insertions, 20 deletions

diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 95f4c391e4f..ed28f774ca4 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -124,6 +124,7 @@ struct menu_device {
 };
 
 static int tune_multiplier = 1024;
+static int forced_state;
 
 #define LOAD_INT(x) ((x) >> FSHIFT)
 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
@@ -290,26 +291,34 @@ static int menu_select(struct cpuidle_device *dev)
 	if (data->expected_us > 5)
 		data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
 
-	/*
-	 * Find the idle state with the lowest power while satisfying
-	 * our constraints.
-	 */
-	for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++) {
-		struct cpuidle_state *s = &dev->states[i];
-
-		if (s->flags & CPUIDLE_FLAG_IGNORE)
-			continue;
-		if (s->target_residency > data->predicted_us)
-			continue;
-		if (s->exit_latency > latency_req)
-			continue;
-		if (s->exit_latency * multiplier > data->predicted_us)
-			continue;
-
-		if (s->power_usage < power_usage) {
-			power_usage = s->power_usage;
-			data->last_state_idx = i;
-			data->exit_us = s->exit_latency;
+	WARN((forced_state >= dev->state_count), \
+		"Forced state value out of range.\n");
+
+	if ((forced_state != 0) && (forced_state < dev->state_count)) {
+		data->exit_us = dev->states[forced_state].exit_latency;
+		data->last_state_idx = forced_state;
+	} else {
+		/*
+		 * Find the idle state with the lowest power while satisfying
+		 * our constraints.
+		 */
+		for (i = CPUIDLE_DRIVER_STATE_START; i < dev->state_count; i++) {
+			struct cpuidle_state *s = &dev->states[i];
+
+			if (s->flags & CPUIDLE_FLAG_IGNORE)
+				continue;
+			if (s->target_residency > data->predicted_us)
+				continue;
+			if (s->exit_latency > latency_req)
+				continue;
+			if (s->exit_latency * multiplier > data->predicted_us)
+				continue;
+
+			if (s->power_usage < power_usage) {
+				power_usage = s->power_usage;
+				data->last_state_idx = i;
+				data->exit_us = s->exit_latency;
+			}
 		}
 	}
 
@@ -402,6 +411,15 @@ int cpuidle_set_multiplier(unsigned int value)
 }
 EXPORT_SYMBOL(cpuidle_set_multiplier);
 
+/* Writing 0 will remove the forced state. */
+int cpuidle_force_state(unsigned int state)
+{
+	forced_state = state;
+
+	return 0;
+}
+EXPORT_SYMBOL(cpuidle_force_state);
+
 static ssize_t show_multiplier(struct sysdev_class *class,
 				      struct sysdev_class_attribute *attr,
 					  char *buf)