cpufreq: blu_schedutil: Introduce initial bringup

Import from linux 4.9 android-common plus additional changes and fixes

Signed-off-by: engstk <[email protected]>

drivers/cpufreq/Kconfig

@@ -138,6 +138,15 @@ config CPU_FREQ_DEFAULT_GOV_SCHEDUTIL
 	  have a look at the help section of that governor. The fallback
 	  governor will be 'performance'.
 
+config CPU_FREQ_DEFAULT_GOV_BLU_SCHEDUTIL
+	bool "blu_schedutil"
+	select CPU_FREQ_GOV_BLU_SCHEDUTIL
+	select CPU_FREQ_GOV_PERFORMANCE
+	help
+	  Use the 'blu_schedutil' CPUFreq governor by default. If unsure,
+	  have a look at the help section of that governor. The fallback
+	  governor will be 'performance'.
+
 endchoice
 
 config CPU_FREQ_GOV_PERFORMANCE
@@ -277,7 +286,25 @@ config CPU_FREQ_GOV_SCHEDUTIL
 
 	  If in doubt, say N.
 
-comment "CPU frequency scaling drivers"
+config CPU_FREQ_GOV_BLU_SCHEDUTIL
+	tristate "'blu_schedutil' cpufreq policy governor"
+	depends on CPU_FREQ
+	select CPU_FREQ_GOV_ATTR_SET
+	select IRQ_WORK
+	help
+	  This governor makes decisions based on the utilization data provided
+	  by the scheduler.  It sets the CPU frequency to be proportional to
+	  the utilization/capacity ratio coming from the scheduler.  If the
+	  utilization is frequency-invariant, the new frequency is also
+	  proportional to the maximum available frequency.  If that is not the
+	  case, it is proportional to the current frequency of the CPU.  The
+	  frequency tipping point is at utilization/capacity equal to 80% in
+	  both cases.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called cpufreq_blu_schedutil.
+
+	  If in doubt, say N.
 
 config CPUFREQ_DT
 	tristate "Generic DT based cpufreq driver"

kernel/sched/Makefile

@@ -29,3 +29,4 @@ obj-$(CONFIG_CPU_FREQ) += cpufreq.o
 obj-$(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) += cpufreq_schedutil.o
 obj-$(CONFIG_SCHED_CORE_CTL) += core_ctl.o
 obj-$(CONFIG_CPU_FREQ_GOV_SCHED) += cpufreq_sched.o
+obj-$(CONFIG_CPU_FREQ_GOV_BLU_SCHEDUTIL) += cpufreq_blu_schedutil.o