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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-06-07 23:24:07 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-06-07 23:24:07 -0700 |
| commit | a292241cccb7e20e8b997a9a44177e7c98141859 (patch) | |
| tree | a0b0bb95e7dce3233a2d8b203f9e326cdec7a00e /drivers/pwm/pwm-atmel.c | |
| parent | d49cb7aeebb974713f9f7ab2991352d3050b095b (diff) | |
| parent | 68807a0c2015cb40df4869e16651f0ce5cc14d52 (diff) | |
Merge branch 'next' into for-linus
Prepare input updates for 3.16.
Diffstat (limited to 'drivers/pwm/pwm-atmel.c')
| -rw-r--r-- | drivers/pwm/pwm-atmel.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c index bf4144a1466..0adc952cc4e 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)) { @@ -131,7 +133,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, prd = div; div *= duty_ns; do_div(div, period_ns); - dty = div; + dty = prd - div; ret = clk_enable(atmel_pwm->clk); if (ret) { @@ -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); |