pwm: atmel: Fix incorrect CDTY value after disabling

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.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Tested-by: Gaël PORTAY <gael.portay@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 89f9ca41d9af3c6ef4c7e94afc23177358617458..a947c9095d9d6fc99d2b66be702e915eaa26014c 100644 (file)
--- 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);
 }