From: Alexandre Belloni <alexandre.bell...@free-electrons.com>
pwm-leds calls .config() and .disable() in a row. This exhibits that it
may happen that the channel gets disabled before CDTY has been updated
with CUPD. The issue gets quite worse with long periods. So, ensure that
at least one period has past before disabling the channel by polling
ISR.
Signed-off-by: Alexandre Belloni <alexandre.bell...@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.fe...@atmel.com>
Tested-by: Gaël PORTAY <gael.por...@gmail.com>
Signed-off-by: Thierry Reding <thierry.red...@gmail.com>
(cherry picked from commit 472ac3dcac108d6648ee28616c6de1e3b0bb361f)
Signed-off-by: Tan Jui Nee <jui.nee....@intel.com>
---
drivers/pwm/pwm-atmel.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 89f9ca4..a947c90 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -8,9 +8,11 @@
*/
#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
@@ -21,6 +23,7 @@
#define PWM_ENA 0x04
#define PWM_DIS 0x08
#define PWM_SR 0x0C
+#define PWM_ISR 0x1C
/* Bit field in SR */
#define PWM_SR_ALL_CH_ON 0x0F
@@ -60,6 +63,9 @@ struct atmel_pwm_chip {
struct clk *clk;
void __iomem *base;
+ unsigned int updated_pwms;
+ struct mutex isr_lock; /* ISR is cleared when read, ensure only one
thread does that */
+
void (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long dty, unsigned long prd);
};
@@ -144,6 +150,10 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct
pwm_device *pwm,
val = (val & ~PWM_CMR_CPRE_MSK) | (pres & PWM_CMR_CPRE_MSK);
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
atmel_pwm->config(chip, pwm, dty, prd);
+ mutex_lock(&atmel_pwm->isr_lock);
+ atmel_pwm->updated_pwms |= atmel_pwm_readl(atmel_pwm, PWM_ISR);
+ atmel_pwm->updated_pwms &= ~(1 << pwm->hwpwm);
+ mutex_unlock(&atmel_pwm->isr_lock);
clk_disable(atmel_pwm->clk);
return ret;
@@ -243,7 +253,22 @@ static int atmel_pwm_enable(struct pwm_chip *chip, struct
pwm_device *pwm)
static void atmel_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
+ unsigned long timeout = jiffies + 2 * HZ;
+
+ /*
+ * Wait for at least a complete period to have passed before disabling a
+ * channel to be sure that CDTY has been updated
+ */
+ mutex_lock(&atmel_pwm->isr_lock);
+ atmel_pwm->updated_pwms |= atmel_pwm_readl(atmel_pwm, PWM_ISR);
+
+ while (!(atmel_pwm->updated_pwms & (1 << pwm->hwpwm)) &&
+ time_before(jiffies, timeout)) {
+ usleep_range(10, 100);
+ atmel_pwm->updated_pwms |= atmel_pwm_readl(atmel_pwm, PWM_ISR);
+ }
+ mutex_unlock(&atmel_pwm->isr_lock);
atmel_pwm_writel(atmel_pwm, PWM_DIS, 1 << pwm->hwpwm);
clk_disable(atmel_pwm->clk);
@@ -358,6 +383,8 @@ static int atmel_pwm_probe(struct platform_device *pdev)
atmel_pwm->chip.npwm = 4;
atmel_pwm->chip.can_sleep = true;
atmel_pwm->config = data->config;
+ atmel_pwm->updated_pwms = 0;
+ mutex_init(&atmel_pwm->isr_lock);
ret = pwmchip_add(&atmel_pwm->chip);
if (ret < 0) {
@@ -379,6 +406,7 @@ static int atmel_pwm_remove(struct platform_device *pdev)
struct atmel_pwm_chip *atmel_pwm = platform_get_drvdata(pdev);
clk_unprepare(atmel_pwm->clk);
+ mutex_destroy(&atmel_pwm->isr_lock);
return pwmchip_remove(&atmel_pwm->chip);
}
--
1.9.1
--
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