diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-axi-pwmgen.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-axi-pwmgen.c b/drivers/pwm/pwm-axi-pwmgen.c index e1ddeaa4998b..4259a0db9ff4 100644 --- a/drivers/pwm/pwm-axi-pwmgen.c +++ b/drivers/pwm/pwm-axi-pwmgen.c @@ -37,6 +37,8 @@ #define AXI_PWMGEN_REG_RSTN_LOAD_CONFIG BIT(1) #define AXI_PWMGEN_REG_RSTN_RESET BIT(0) #define AXI_PWMGEN_REG_NPWM 0x14 +#define AXI_PWMGEN_REG_CONFIG 0x18 +#define AXI_PWMGEN_REG_CONFIG_FORCE_ALIGN BIT(1) #define AXI_PWMGEN_CHX_PERIOD(ch) (0x40 + (4 * (ch))) #define AXI_PWMGEN_CHX_DUTY(ch) (0x80 + (4 * (ch))) #define AXI_PWMGEN_CHX_OFFSET(ch) (0xC0 + (4 * (ch))) @@ -227,6 +229,16 @@ static int axi_pwmgen_setup(struct regmap *regmap, struct device *dev) if (ret) return ret; + /* + * Enable force align so that changes to PWM period and duty cycle take + * effect immediately. Otherwise, the effect of the change is delayed + * until the period of all channels run out, which can be long after the + * apply function returns. + */ + ret = regmap_set_bits(regmap, AXI_PWMGEN_REG_CONFIG, AXI_PWMGEN_REG_CONFIG_FORCE_ALIGN); + if (ret) + return ret; + ret = regmap_read(regmap, AXI_PWMGEN_REG_NPWM, &val); if (ret) return ret; |