cpufreq: add smartassV2 governor

Ported to Huawei U8150 Froyo by Alan Orth <alan.orth@gmail.com>

Documentation/cpu-freq/governors.txt

@@ -29,6 +29,7 @@ Contents:
 2.4  Ondemand
 2.5  Conservative
 2.6  Interactive
+2.7  SmartassV2
 
 3.   The Governor Interface in the CPUfreq Core
 
@@ -206,6 +207,40 @@ more accurately determine the cpu workload and the best speed for that
 workload. The default is 50ms.
 
 
+2.7 SmartassV2
+---------------
+
+The CPUfreq governor "smartassV2", like other governors, aims to balance
+performance vs battery life by using low frequencies when load is low and
+ramping the frequency when necessary, fast enough to ensure responsiveness.
+
+The implementation of the governor is roughtly based on the idea of interactive.
+The idle loop is used to track when the CPU has idle cycles. The idle loop will
+set a relatively high rate timer to sample the load when appropriate, the timer
+will measure the load since it was set and schedule a work queue task to do the
+actual frequency change when necessary.
+
+The most important tunable is the "ideal" frequency: this governor will aim
+for this frequency, in the sense that it will ramp towards this frequency much
+more aggresively than beyond it - both when ramping up from below this frequency
+and when ramping down from above this frequency. Still, note, that when load is
+low enough the governor should choose the lowest available frequency regardless
+of the ideal frequency and similarly when load is consistently high enough the
+highest available frequency will be used.
+
+Smartass also tracks the state of the screen, and when screen is off (a.k.a
+sleep or suspended in the terms of this governor) a different ideal frequency
+is used. This is the only difference between the screen on and screen off
+states. Proper tuning of the awake_ideal_freq and sleep_ideal_freq should
+allow both high responsiveness when screen is on and utilizing the low
+frequency range when load is low, especially when screen is off.
+
+Finally, smartass is a highly customizable governor with almost everything
+tweakable through the sysfs. For a detailed explaination of each tunable,
+please see the inline comments at the begging of the code (smartass2.c).
+
+
+
 3. The Governor Interface in the CPUfreq Core
 =============================================
 

drivers/cpufreq/Kconfig

@@ -111,6 +111,12 @@ config CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
 	  governor. If unsure have a look at the help section of the
 	  driver. Fallback governor will be the performance governor.
 
+config CPU_FREQ_DEFAULT_GOV_SMARTASS2
+	bool "smartass2"
+	select CPU_FREQ_GOV_SMARTASS2
+	help
+	  Use the CPUFreq governor 'smartassV2' as default.
+
 config CPU_FREQ_DEFAULT_GOV_INTERACTIVE
 	bool "interactive"
 	select CPU_FREQ_GOV_INTERACTIVE
@@ -206,4 +212,12 @@ config CPU_FREQ_GOV_CONSERVATIVE
 
 	  If in doubt, say N.
 
+config CPU_FREQ_GOV_SMARTASS2
+	tristate "'smartassV2' cpufreq governor"
+	depends on CPU_FREQ
+	help
+	  'smartassV2' - a "smart" optimized governor for the hero!
+
+	  If in doubt, say N.
+
 endif	# CPU_FREQ

drivers/cpufreq/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE)	+= cpufreq_powersave.o
 obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE)	+= cpufreq_userspace.o
 obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND)	+= cpufreq_ondemand.o
 obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)	+= cpufreq_conservative.o
+obj-$(CONFIG_CPU_FREQ_GOV_SMARTASS2)	+= cpufreq_smartass2.o
 obj-$(CONFIG_CPU_FREQ_GOV_INTERACTIVE)	+= cpufreq_interactive.o
 
 # CPUfreq cross-arch helpers