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path: root/drivers/pwm/pwm-visconti.c
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Diffstat (limited to 'drivers/pwm/pwm-visconti.c')
-rw-r--r--drivers/pwm/pwm-visconti.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/drivers/pwm/pwm-visconti.c b/drivers/pwm/pwm-visconti.c
index 46d903786366..af4e37d3e3a6 100644
--- a/drivers/pwm/pwm-visconti.c
+++ b/drivers/pwm/pwm-visconti.c
@@ -82,17 +82,14 @@ static int visconti_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
return -ERANGE;
/*
- * PWMC controls a divider that divides the input clk by a
- * power of two between 1 and 8. As a smaller divider yields
- * higher precision, pick the smallest possible one.
+ * PWMC controls a divider that divides the input clk by a power of two
+ * between 1 and 8. As a smaller divider yields higher precision, pick
+ * the smallest possible one. As period is at most 0xffff << 3, pwmc0 is
+ * in the intended range [0..3].
*/
- if (period > 0xffff) {
- pwmc0 = ilog2(period >> 16);
- if (WARN_ON(pwmc0 > 3))
- return -EINVAL;
- } else {
- pwmc0 = 0;
- }
+ pwmc0 = fls(period >> 16);
+ if (WARN_ON(pwmc0 > 3))
+ return -EINVAL;
period >>= pwmc0;
duty_cycle >>= pwmc0;