ODROID-C2: amlogic/pwm: PWM frequency divider error fix.

Change-Id: I5fef9661159ed32d43444f7b574c898d7a68c2b7

Author: ckkim

drivers/amlogic/pwm/pwm-ctrl.c

@@ -28,7 +28,7 @@ struct pwm_ctrl {
 	int duty0, duty1;
 };
 
-#define FREQ_MIN 10         /* 10Hz */
+#define FREQ_MIN 46         /* 50Hz */
 #define FREQ_MAX 1000000    /* 1MHz */
 #define DUTY_MAX 1024       /* Duty cycle Max */
 
@@ -136,7 +136,7 @@ static ssize_t set_freq0(struct device *dev,
 		return -EINVAL;
 
 	if ((val < FREQ_MIN) || (val > FREQ_MAX)) {
-		dev_err(dev, "PWM_0 : Invalid param. Frequency range is 10Hz to 1MHz\n");
+		dev_err(dev, "PWM_0 : Invalid param. Frequency range is 46Hz to 1MHz\n");
 		return count;
 	}
 	dev_dbg(dev, "PWM_0 : %s [%d]\n", __func__, val);
@@ -287,7 +287,7 @@ static ssize_t set_freq1(struct device *dev,
 		return -EINVAL;
 
 	if ((val < FREQ_MIN) || (val > FREQ_MAX)) {
-		dev_err(dev, "PWM_1 : Invalid param. Frequency range is 10Hz to 1MHz\n");
+		dev_err(dev, "PWM_1 : Invalid param. Frequency range is 46Hz to 1MHz\n");
 		return count;
 	}
 	dev_dbg(dev, "PWM_1 : %s [%d]\n", __func__, val);

drivers/amlogic/pwm/pwm-meson.c

@@ -50,6 +50,8 @@ MODULE_PARM_DESC(npwm , "\n odroid-c1 The number of available pwm (max 2-port)\n
 #define PWM_A   0
 #define PWM_F   1
 #define FIN_FREQ		(24 * 1000)
+#define FREQ_MIN 46         /* 50Hz */
+#define FREQ_MAX 1000000    /* 1MHz */
 #define DUTY_MAX 1024
 
 struct meson_pwm_device {
@@ -139,6 +141,10 @@ static int meson_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	unsigned long temp = 0;
 	int i = 0;
 
+	if ((pwm_freq < FREQ_MIN) || (pwm_freq > FREQ_MAX)) {
+		dev_err(dev, "Can not available freq. (46Hz to 1MHz!!!\n");
+		return -EINVAL;
+	}
 	if ((duty < 0) || (duty > DUTY_MAX)) {
 		dev_err(dev, "Not available duty... error!!!\n");
 		return -EINVAL;

drivers/pwm/core.c

@@ -409,8 +409,10 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
 {
 	int err;
 
+#if !defined(CONFIG_ARCH_MESON64_ODROIDC2)
 	if (!pwm || duty_ns < 0 || period_ns <= 0 || duty_ns > period_ns)
 		return -EINVAL;
+#endif
 
 	err = pwm->chip->ops->config(pwm->chip, pwm, duty_ns, period_ns);
 	if (err)