diff options
Diffstat (limited to 'drivers/pwm/pwm-atmel.c')
| -rw-r--r-- | drivers/pwm/pwm-atmel.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index 0e4bd4e8e582..e6b8b1b7e6ba 100644 --- a/drivers/pwm/pwm-atmel.c +++ b/drivers/pwm/pwm-atmel.c @@ -64,7 +64,8 @@ struct atmel_pwm_chip { void __iomem *base; unsigned int updated_pwms; - struct mutex isr_lock; /* ISR is cleared when read, ensure only one thread does that */ + /* ISR is cleared when read, ensure only one thread does that */ + struct mutex isr_lock; void (*config)(struct pwm_chip *chip, struct pwm_device *pwm, unsigned long dty, unsigned long prd); @@ -271,6 +272,16 @@ static void atmel_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) mutex_unlock(&atmel_pwm->isr_lock); atmel_pwm_writel(atmel_pwm, PWM_DIS, 1 << pwm->hwpwm); + /* + * Wait for the PWM channel disable operation to be effective before + * stopping the clock. + */ + timeout = jiffies + 2 * HZ; + + while ((atmel_pwm_readl(atmel_pwm, PWM_SR) & (1 << pwm->hwpwm)) && + time_before(jiffies, timeout)) + usleep_range(10, 100); + clk_disable(atmel_pwm->clk); } @@ -324,21 +335,14 @@ MODULE_DEVICE_TABLE(of, atmel_pwm_dt_ids); static inline const struct atmel_pwm_data * atmel_pwm_get_driver_data(struct platform_device *pdev) { - if (pdev->dev.of_node) { - const struct of_device_id *match; - - match = of_match_device(atmel_pwm_dt_ids, &pdev->dev); - if (!match) - return NULL; + const struct platform_device_id *id; - return match->data; - } else { - const struct platform_device_id *id; + if (pdev->dev.of_node) + return of_device_get_match_data(&pdev->dev); - id = platform_get_device_id(pdev); + id = platform_get_device_id(pdev); - return (struct atmel_pwm_data *)id->driver_data; - } + return (struct atmel_pwm_data *)id->driver_data; } static int atmel_pwm_probe(struct platform_device *pdev) |