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-rw-r--r--drivers/pwm/pwm-tegra.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index 0a688dabd670..21518bea00c6 100644
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -76,6 +76,7 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
struct tegra_pwm_chip *pc = to_tegra_pwm_chip(chip);
unsigned long long c = duty_ns;
unsigned long rate, hz;
+ unsigned long long ns100 = NSEC_PER_SEC;
u32 val = 0;
int err;
@@ -94,9 +95,11 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
* cycles at the PWM clock rate will take period_ns nanoseconds.
*/
rate = clk_get_rate(pc->clk) >> PWM_DUTY_WIDTH;
- hz = NSEC_PER_SEC / period_ns;
- rate = (rate + (hz / 2)) / hz;
+ /* Consider precision in PWM_SCALE_WIDTH rate calculation */
+ ns100 *= 100;
+ hz = DIV_ROUND_CLOSEST_ULL(ns100, period_ns);
+ rate = DIV_ROUND_CLOSEST(rate * 100, hz);
/*
* Since the actual PWM divider is the register's frequency divider