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exynos3: power: Tuning and cleanups
* Tune the governor for better power usage and interactivity * Reset tuning parameters if governor changes * Cleanup Change-Id: Ibe60ece836a0e56ba58e109bbea26cbd54d75421
This commit is contained in:
parent
79b8917c20
commit
de4b10b242
1 changed files with 55 additions and 12 deletions
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@ -29,6 +29,8 @@
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#define SCALING_GOVERNOR_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"
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#define BOOSTPULSE_ONDEMAND "/sys/devices/system/cpu/cpufreq/ondemand/boostpulse"
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#define BOOSTPULSE_INTERACTIVE "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
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#define TIMER_RATE_SCREEN_ON "30000"
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#define TIMER_RATE_SCREEN_OFF "150000"
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struct s5pc110_power_module {
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struct power_module base;
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@ -37,6 +39,8 @@ struct s5pc110_power_module {
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int boostpulse_warned;
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};
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static char governor[20];
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static int sysfs_read(char *path, char *s, int num_bytes)
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{
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char buf[80];
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@ -65,9 +69,30 @@ static int sysfs_read(char *path, char *s, int num_bytes)
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return ret;
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}
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static int get_scaling_governor(char governor[], int size) {
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static void sysfs_write(char *path, char *s)
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{
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char buf[80];
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int len;
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int fd = open(path, O_WRONLY);
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if (fd < 0) {
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error opening %s: %s\n", path, buf);
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return;
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}
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len = write(fd, s, strlen(s));
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if (len < 0) {
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error writing to %s: %s\n", path, buf);
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}
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close(fd);
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}
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static int get_scaling_governor() {
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if (sysfs_read(SCALING_GOVERNOR_PATH, governor,
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size) == -1) {
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sizeof(governor)) == -1) {
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// Can't obtain the scaling governor. Return.
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return -1;
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} else {
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@ -83,15 +108,35 @@ static int get_scaling_governor(char governor[], int size) {
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return 0;
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}
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static void s5pc110_power_set_interactive(struct power_module *module, int on)
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{
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if (strncmp(governor, "interactive", 11) == 0)
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sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate",
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on ? TIMER_RATE_SCREEN_ON : TIMER_RATE_SCREEN_OFF);
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}
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static void configure_governor()
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{
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s5pc110_power_set_interactive(NULL, 1);
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if (strncmp(governor, "ondemand", 8) == 0) {
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sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/up_threshold", "95");
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sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/io_is_busy", "1");
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sysfs_write("/sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor", "4");
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} else if (strncmp(governor, "interactive", 11) == 0) {
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sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time", "90000");
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sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay", "30000");
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}
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}
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static int boostpulse_open(struct s5pc110_power_module *s5pc110)
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{
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char buf[80];
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char governor[80];
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pthread_mutex_lock(&s5pc110->lock);
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if (s5pc110->boostpulse_fd < 0) {
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if (get_scaling_governor(governor, sizeof(governor)) < 0) {
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if (get_scaling_governor() < 0) {
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ALOGE("Can't read scaling governor.");
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s5pc110->boostpulse_warned = 1;
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} else {
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@ -104,10 +149,12 @@ static int boostpulse_open(struct s5pc110_power_module *s5pc110)
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error opening %s boostpulse interface: %s\n", governor, buf);
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s5pc110->boostpulse_warned = 1;
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} else if (s5pc110->boostpulse_fd > 0)
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} else if (s5pc110->boostpulse_fd > 0) {
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configure_governor();
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ALOGD("Opened %s boostpulse interface", governor);
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}
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}
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}
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pthread_mutex_unlock(&s5pc110->lock);
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return s5pc110->boostpulse_fd;
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@ -152,14 +199,10 @@ static void s5pc110_power_hint(struct power_module *module, power_hint_t hint,
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}
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}
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static void s5pc110_power_set_interactive(struct power_module *module, int on)
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{
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return;
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}
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static void s5pc110_power_init(struct power_module *module)
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{
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return;
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get_scaling_governor();
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configure_governor();
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}
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static struct hw_module_methods_t power_module_methods = {
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@ -174,7 +217,7 @@ struct s5pc110_power_module HAL_MODULE_INFO_SYM = {
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hal_api_version: HARDWARE_HAL_API_VERSION,
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id: POWER_HARDWARE_MODULE_ID,
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name: "S5PC110 Power HAL",
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author: "The Android Open Source Project",
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author: "The CyanogenMod Project",
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methods: &power_module_methods,
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},
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init: s5pc110_power_init,
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