nx: allow bootloader-passed oc

- Update uscript to check oc, max cpu and gpu freqs
- Update init to poke node to allow max scaling

Perf mode on perfmgr already allows full kernel scaling, so this
will just allow that to rise to max.

A better impl later may involve editing the json to have higher
game profiles etc, but for now this is more than fine.

Change-Id: I669fa523944dc0a99c2c9d6a6360593ee0a4bd8c

bootfiles/android_boot.txt

@@ -20,6 +20,7 @@ test -n ${touch_skip_tuning}    || setenv touch_skip_tuning 0
 test -n ${bt_ertm_disable}      || setenv bt_ertm_disable 0
 test -n ${wifi_disable_vht80}   || setenv wifi_disable_vht80 0
 test -n ${alarms_disable}       || setenv alarms_disable 0
+test -n ${oc}                   || setenv oc 0
 
 # Built-in IMU.
 test -n ${acc_cal_off_x} || setenv acc_cal_off_x 0x0
@@ -356,6 +357,22 @@ if test ${t210b01} = 1 -a ${gpu_dvfsc} = 1; then
 	fi
 fi
 
+# Allow overclocking.
+if test ${oc} = 1; then
+	echoe "CPU OC enabled"
+	setenv bootargs_extra ${bootargs_extra} "androidboot.oc=1"
+fi
+
+if test -n ${max_cpu_freq}; then
+	echoe "Max CPU freq applied: ${max_cpu_freq} KHz"
+	fdt set /cpufreq/cpu-scaling-data max-frequency <${max_cpu_freq}>
+fi
+
+if test -n ${max_gpu_freq}; then
+	echoe "Max GPU freq applied: ${max_gpu_freq} KHz"
+	fdt set /dvfs nvidia,gpu-max-freq-khz <${max_gpu_freq}>
+fi
+
 # Limit GPU clock.
 if test ${t210b01} = 1 -a ${limit_gpu_clk} = 1; then
 	if test ${sku} != 2; then

initfiles/init.nx.rc

@@ -35,8 +35,15 @@ on post-fs-data
     chmod 0666 /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
     chown system system /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
 
+    chmod 0664 /sys/kernel/tegra_cpufreq/overclock
+    chown system system /sys/kernel/tegra_cpufreq/overclock
+
     chown system system /sys/bus/platform/devices/tegradc.0/enable
 
+# enable oc only if passed from bootloader (no userspace toggle)
+on property:vold.post_fs_data_done=1 && property:ro.boot.oc=1
+    write /sys/kernel/tegra_cpufreq/overclock 1
+
 on boot
     write /sys/devices/system/cpu/cpufreq/schedutil/up_rate_limit_us 500
     write /sys/module/input_cfboost/parameters/boost_gpu 460800