From: 黄涛 <huangtao@rock-chips.com>
Date: Wed, 3 Jul 2013 02:11:09 +0000 (+0800)
Subject: rk30: cpufreq: support sys_state
X-Git-Tag: firefly_0821_release~6958
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c83124f13aa04969eed5f7fd444a7edc4586aad2;p=firefly-linux-kernel-4.4.55.git

rk30: cpufreq: support sys_state
---

diff --git a/arch/arm/mach-rk30/cpufreq.c b/arch/arm/mach-rk30/cpufreq.c
index d16f8c901315..ad7b788e3de0 100755
--- a/arch/arm/mach-rk30/cpufreq.c
+++ b/arch/arm/mach-rk30/cpufreq.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/regulator/consumer.h>
 #include <linux/fs.h>
+#include <linux/miscdevice.h>
 #include <linux/string.h>
 #include <linux/earlysuspend.h>
 #include <asm/unistd.h>
@@ -127,6 +128,32 @@ static const struct cpufreq_frequency_table temp_limits_high[] = {
 
 extern int rk30_tsadc_get_temp(unsigned int chn);
 
+static char sys_state;
+static ssize_t sys_state_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+{
+	char state;
+
+	if (count < 1)
+		return count;
+	if (copy_from_user(&state, buffer, 1)) {
+		return -EFAULT;
+	}
+
+	sys_state = state;
+	return count;
+}
+
+static const struct file_operations sys_state_fops = {
+	.owner	= THIS_MODULE,
+	.write	= sys_state_write,
+};
+
+static struct miscdevice sys_state_dev = {
+	.fops	= &sys_state_fops,
+	.name	= "sys_state",
+	.minor	= MISC_DYNAMIC_MINOR,
+};
+
 static void rk30_cpufreq_temp_limit_work_func(struct work_struct *work)
 {
 	struct cpufreq_policy *policy;
@@ -142,7 +169,7 @@ static void rk30_cpufreq_temp_limit_work_func(struct work_struct *work)
 	FREQ_PRINTK_LOG("cpu_thermal(%d)\n", temp);
 
 	gpu_irqs[1] = kstat_irqs(IRQ_GPU_GP);
-	if (clk_get_rate(gpu_clk) > GPU_MAX_RATE) {
+	if (sys_state == '1' || clk_get_rate(gpu_clk) > GPU_MAX_RATE) {
 		delay = HZ / 20;
 		if ((gpu_irqs[1] - gpu_irqs[0]) < 3) {
 			limits_table = temp_limits_high;
@@ -279,6 +306,7 @@ static int rk30_cpu_init(struct cpufreq_policy *policy)
 
 		freq_wq = create_singlethread_workqueue("rk30_cpufreqd");
 #ifdef CONFIG_RK30_CPU_FREQ_LIMIT_BY_TEMP
+		misc_register(&sys_state_dev);
 		if (rk30_cpufreq_is_ondemand_policy(policy)) {
 			queue_delayed_work(freq_wq, &rk30_cpufreq_temp_limit_work, 0*HZ);
 		}
@@ -321,6 +349,7 @@ static int rk30_cpu_exit(struct cpufreq_policy *policy)
 	cpufreq_unregister_notifier(&notifier_policy_block, CPUFREQ_POLICY_NOTIFIER);
 	if (freq_wq)
 		cancel_delayed_work(&rk30_cpufreq_temp_limit_work);
+	misc_deregister(&sys_state_dev);
 #endif
 	if (freq_wq) {
 		flush_workqueue(freq_wq);