Merge pull request #55 from toradex/4.14-2.0.x-imx

4.14 2.0.x imx

8 files changed, 17 insertions, 10 deletions

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index c45e5719ba17..b1b74cfb1571 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -874,6 +874,7 @@ void pwm_put(struct pwm_device *pwm)
 	if (pwm->chip->ops->free)
 		pwm->chip->ops->free(pwm->chip, pwm);
 
+	pwm_set_chip_data(pwm, NULL);
 	pwm->label = NULL;
 
 	module_put(pwm->chip->ops->owner);
diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c
index d961a8207b1c..31b01035d0ab 100644
--- a/drivers/pwm/pwm-bcm-iproc.c
+++ b/drivers/pwm/pwm-bcm-iproc.c
@@ -187,6 +187,7 @@ static int iproc_pwmc_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 static const struct pwm_ops iproc_pwm_ops = {
 	.apply = iproc_pwmc_apply,
 	.get_state = iproc_pwmc_get_state,
+	.owner = THIS_MODULE,
 };
 
 static int iproc_pwmc_probe(struct platform_device *pdev)
diff --git a/drivers/pwm/pwm-berlin.c b/drivers/pwm/pwm-berlin.c
index 771859aca4be..7bb819e3c0c1 100644
--- a/drivers/pwm/pwm-berlin.c
+++ b/drivers/pwm/pwm-berlin.c
@@ -78,7 +78,6 @@ static void berlin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	struct berlin_pwm_channel *channel = pwm_get_chip_data(pwm);
 
-	pwm_set_chip_data(pwm, NULL);
 	kfree(channel);
 }
 
diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
index 26ec24e457b1..7e16b7def0dc 100644
--- a/drivers/pwm/pwm-clps711x.c
+++ b/drivers/pwm/pwm-clps711x.c
@@ -48,7 +48,7 @@ static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v)
 static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v)
 {
 	/* Duty cycle 0..15 max */
-	return DIV_ROUND_CLOSEST(v * 0xf, pwm_get_period(pwm));
+	return DIV_ROUND_CLOSEST(v * 0xf, pwm->args.period);
 }
 
 static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -71,7 +71,7 @@ static int clps711x_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct clps711x_chip *priv = to_clps711x_chip(chip);
 	unsigned int duty;
 
-	if (period_ns != pwm_get_period(pwm))
+	if (period_ns != pwm->args.period)
 		return -EINVAL;
 
 	duty = clps711x_get_duty(pwm, duty_ns);
diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
index 4721a264bac2..1e69c1c9ec09 100644
--- a/drivers/pwm/pwm-lpss.c
+++ b/drivers/pwm/pwm-lpss.c
@@ -97,7 +97,7 @@ static void pwm_lpss_prepare(struct pwm_lpss_chip *lpwm, struct pwm_device *pwm,
 	unsigned long long on_time_div;
 	unsigned long c = lpwm->info->clk_rate, base_unit_range;
 	unsigned long long base_unit, freq = NSEC_PER_SEC;
-	u32 ctrl;
+	u32 orig_ctrl, ctrl;
 
 	do_div(freq, period_ns);
 
@@ -114,13 +114,17 @@ static void pwm_lpss_prepare(struct pwm_lpss_chip *lpwm, struct pwm_device *pwm,
 	do_div(on_time_div, period_ns);
 	on_time_div = 255ULL - on_time_div;
 
-	ctrl = pwm_lpss_read(pwm);
+	orig_ctrl = ctrl = pwm_lpss_read(pwm);
 	ctrl &= ~PWM_ON_TIME_DIV_MASK;
 	ctrl &= ~(base_unit_range << PWM_BASE_UNIT_SHIFT);
 	base_unit &= base_unit_range;
 	ctrl |= (u32) base_unit << PWM_BASE_UNIT_SHIFT;
 	ctrl |= on_time_div;
-	pwm_lpss_write(pwm, ctrl);
+
+	if (orig_ctrl != ctrl) {
+		pwm_lpss_write(pwm, ctrl);
+		pwm_lpss_write(pwm, ctrl | PWM_SW_UPDATE);
+	}
 }
 
 static inline void pwm_lpss_cond_enable(struct pwm_device *pwm, bool cond)
@@ -144,7 +148,6 @@ static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 				return ret;
 			}
 			pwm_lpss_prepare(lpwm, pwm, state->duty_cycle, state->period);
-			pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_SW_UPDATE);
 			pwm_lpss_cond_enable(pwm, lpwm->info->bypass == false);
 			ret = pwm_lpss_wait_for_update(pwm);
 			if (ret) {
@@ -157,7 +160,6 @@ static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			if (ret)
 				return ret;
 			pwm_lpss_prepare(lpwm, pwm, state->duty_cycle, state->period);
-			pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_SW_UPDATE);
 			return pwm_lpss_wait_for_update(pwm);
 		}
 	} else if (pwm_is_enabled(pwm)) {
diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
index a7eaf962a95b..567f5e2771c4 100644
--- a/drivers/pwm/pwm-pca9685.c
+++ b/drivers/pwm/pwm-pca9685.c
@@ -176,7 +176,6 @@ static void pca9685_pwm_gpio_free(struct gpio_chip *gpio, unsigned int offset)
 	pm_runtime_put(pca->chip.dev);
 	mutex_lock(&pca->lock);
 	pwm = &pca->chip.pwms[offset];
-	pwm_set_chip_data(pwm, NULL);
 	mutex_unlock(&pca->lock);
 }
 
diff --git a/drivers/pwm/pwm-samsung.c b/drivers/pwm/pwm-samsung.c
index 062f2cfc45ec..3762432dd6a7 100644
--- a/drivers/pwm/pwm-samsung.c
+++ b/drivers/pwm/pwm-samsung.c
@@ -238,7 +238,6 @@ static int pwm_samsung_request(struct pwm_chip *chip, struct pwm_device *pwm)
 static void pwm_samsung_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
 	devm_kfree(chip->dev, pwm_get_chip_data(pwm));
-	pwm_set_chip_data(pwm, NULL);
 }
 
 static int pwm_samsung_enable(struct pwm_chip *chip, struct pwm_device *pwm)
diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c
index 9793b296108f..3f2e4ef695d7 100644
--- a/drivers/pwm/pwm-stm32-lp.c
+++ b/drivers/pwm/pwm-stm32-lp.c
@@ -59,6 +59,12 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	/* Calculate the period and prescaler value */
 	div = (unsigned long long)clk_get_rate(priv->clk) * state->period;
 	do_div(div, NSEC_PER_SEC);
+	if (!div) {
+		/* Clock is too slow to achieve requested period. */
+		dev_dbg(priv->chip.dev, "Can't reach %u ns\n",	state->period);
+		return -EINVAL;
+	}
+
 	prd = div;
 	while (div > STM32_LPTIM_MAX_ARR) {
 		presc++;