pwm: bcm-iproc: handle clk_get_rate() return
[ Upstream commit5.4-rM2-2.2.x-imx-squashed6ced5ff0be
] Handle clk_get_rate() returning 0 to avoid possible division by zero. Fixes:daa5abc41c
("pwm: Add support for Broadcom iProc PWM controller") Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Signed-off-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
parent
ba2c4d0e72
commit
3d0808f3c7
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@ -85,8 +85,6 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
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u64 tmp, multi, rate;
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u64 tmp, multi, rate;
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u32 value, prescale;
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u32 value, prescale;
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rate = clk_get_rate(ip->clk);
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value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
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value = readl(ip->base + IPROC_PWM_CTRL_OFFSET);
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if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm)))
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if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm)))
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@ -99,6 +97,13 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
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else
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else
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state->polarity = PWM_POLARITY_INVERSED;
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state->polarity = PWM_POLARITY_INVERSED;
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rate = clk_get_rate(ip->clk);
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if (rate == 0) {
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state->period = 0;
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state->duty_cycle = 0;
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return;
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}
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value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET);
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value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET);
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prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm);
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prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm);
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prescale &= IPROC_PWM_PRESCALE_MAX;
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prescale &= IPROC_PWM_PRESCALE_MAX;
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