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Diffstat (limited to 'arch/arm/plat-s3c/pwm.c')
-rw-r--r--arch/arm/plat-s3c/pwm.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c/pwm.c b/arch/arm/plat-s3c/pwm.c
index f3d37ac5595b..4fdc5b307fd2 100644
--- a/arch/arm/plat-s3c/pwm.c
+++ b/arch/arm/plat-s3c/pwm.c
@@ -247,6 +247,10 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
tcmp = duty_ns / tin_ns;
tcmp = tcnt - tcmp;
+ /* the pwm hw only checks the compare register after a decrement,
+ so the pin never toggles if tcmp = tcnt */
+ if (tcmp == tcnt)
+ tcmp--;
pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);