pwm: atmel: Fix polarity handling

When atmel_pwm_config() calculates and then sets the prescaler, it is
overwriting the channel's CMR register so we are losing the CPOL
configuration.

As atmel_pwm_config() is always called before enabling a channel,
inverting the polarity doesn't work.

Fix that by reading CMR first and only overwriting the prescaler bits.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index bf4144a14661..2d69e9c431dd 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -32,6 +32,7 @@
 /* Bit field in CMR */
 #define PWM_CMR_CPOL            (1 << 9)
 #define PWM_CMR_UPD_CDTY        (1 << 10)
+#define PWM_CMR_CPRE_MSK        0xF
 
 /* The following registers for PWM v1 */
 #define PWMV1_CDTY              0x04
@@ -104,6 +105,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
         unsigned long clk_rate, prd, dty;
         unsigned long long div;
         unsigned int pres = 0;
+        u32 val;
         int ret;
 
         if (test_bit(PWMF_ENABLED, &pwm->flags) && (period_ns != pwm->period)) {
@@ -139,7 +141,10 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
                 return ret;
         }
 
-        atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, pres);
+        /* It is necessary to preserve CPOL, inside CMR */
+        val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
+        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);
 
         clk_disable(atmel_pwm->clk);