| Message ID | 1324265008-22866-1-git-send-email-jason.chen@linaro.org |
|---|---|
| State | Accepted |
| Commit | 5776ac2eb33164c77cdb4d2b48feee15616eaba3 |
| Headers | show |
diff --git a/arch/arm/plat-mxc/pwm.c b/arch/arm/plat-mxc/pwm.c index 6b78490..0b112d2 100644 --- a/arch/arm/plat-mxc/pwm.c +++ b/arch/arm/plat-mxc/pwm.c @@ -78,6 +78,15 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) do_div(c, period_ns); duty_cycles = c; + /* + * according to imx pwm RM, the real period value should be + * PERIOD value in PWMPR plus 2. + */ + if (period_cycles > 2) + period_cycles -= 2; + else + period_cycles = 0; + writel(duty_cycles, pwm->mmio_base + MX3_PWMSAR); writel(period_cycles, pwm->mmio_base + MX3_PWMPR);
According to imx pwm RM, the real period value should be PERIOD value in PWMPR plus 2. PWMO (Hz) = PCLK(Hz) / (period +2) Signed-off-by: Jason Chen <jason.chen@linaro.org> --- arch/arm/plat-mxc/pwm.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)