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ARM:imx:fix pwm period value
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> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Cc: stable@kernel.org
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@ -77,6 +77,15 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
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do_div(c, period_ns);
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duty_cycles = c;
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/*
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* according to imx pwm RM, the real period value should be
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* PERIOD value in PWMPR plus 2.
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*/
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if (period_cycles > 2)
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period_cycles -= 2;
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else
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period_cycles = 0;
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writel(duty_cycles, pwm->mmio_base + MX3_PWMSAR);
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writel(period_cycles, pwm->mmio_base + MX3_PWMPR);
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