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MLK-16477 cpufreq: imx8: switch cpufreq governor to schedutil for multi-cluster 

For multi-cluster platforms like i.MX8QM, the best cpufreq
governor is schedutil, as common cpufreq framework decides
default cpufreq governor in static compile, so this patch
adds dynamic switch of cpufreq governor according to cluster
number, changing it via sysfs interface, although it is
ugly, but it realizes dynamic cpufreq governor select for
users.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
pull/10/head
Anson Huang 2017-09-18 12:41:40 +08:00 committed by Jason Liu
parent 0e8ac60237
commit 13f2a09502
1 changed files with 38 additions and 0 deletions
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38
drivers/cpufreq/imx8-cpufreq.c
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@ -17,10 +17,13 @@
#include <linux/pm_opp.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/syscalls.h>
#include <soc/imx/fsl_sip.h>
#define MAX_CLUSTER_NUM 2
static struct delayed_work cpufreq_governor_daemon;
static DEFINE_SPINLOCK(cpufreq_psci_lock);
struct imx8_cpufreq {
@ -33,6 +36,36 @@ static unsigned int transition_latency[MAX_CLUSTER_NUM];
struct device *cpu_dev;
static struct thermal_cooling_device *cdev[2];
static void cpufreq_governor_daemon_handler(struct work_struct *work)
{
int fd, i;
unsigned char cluster_governor[MAX_CLUSTER_NUM][54] = {
"/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor",
"",
};
/* generate second cluster's cpufreq governor path */
sprintf(cluster_governor[MAX_CLUSTER_NUM - 1],
"%s%d%s", "/sys/devices/system/cpu/cpu", num_online_cpus() - 1,
"/cpufreq/scaling_governor");
for (i = 0; i < MAX_CLUSTER_NUM; i++) {
fd = sys_open((const char __user __force *)cluster_governor[i],
O_RDWR, 0700);
if (fd >= 0) {
sys_write(fd, "schedutil", strlen("schedutil"));
sys_close(fd);
pr_info("switch cluster %d cpu-freq governor to schedutil\n",
i);
} else {
/* re-schedule if sys write is NOT ready */
schedule_delayed_work(&cpufreq_governor_daemon,
msecs_to_jiffies(3000));
break;
}
}
}
static int imx8_set_target(struct cpufreq_policy *policy, unsigned int index)
{
struct arm_smccc_res res;
@ -172,6 +205,11 @@ static int imx8_cpufreq_probe(struct platform_device *pdev)
for (i = 1; i < num_online_cpus(); i++) {
if (topology_physical_package_id(i) == topology_physical_package_id(0))
continue;
INIT_DELAYED_WORK(&cpufreq_governor_daemon,
cpufreq_governor_daemon_handler);
schedule_delayed_work(&cpufreq_governor_daemon,
msecs_to_jiffies(3000));
first_cpu_dev = cpu_dev;
cpu_dev = get_cpu_device(i);
if (!cpu_dev) {