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| author | Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> | 2020-07-17 21:46:06 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-21 11:05:36 +0200 |
| commit | 17dc3213fbc0e7f9fd962ba9dd4ca6d215f53fa7 (patch) | |
| tree | 07f72c3db092df9d57f3168865cf4ce09a169825 /drivers/pwm | |
| parent | f0b9f54f4763091d4616d4fcf104d65967820f93 (diff) | |
| download | linux-stable-17dc3213fbc0e7f9fd962ba9dd4ca6d215f53fa7.tar.gz linux-stable-17dc3213fbc0e7f9fd962ba9dd4ca6d215f53fa7.tar.bz2 linux-stable-17dc3213fbc0e7f9fd962ba9dd4ca6d215f53fa7.zip | |
pwm: bcm-iproc: handle clk_get_rate() return
[ Upstream commit 6ced5ff0be8e94871ba846dfbddf69d21363f3d7 ]
Handle clk_get_rate() returning 0 to avoid possible division by zero.
Fixes: daa5abc41c80 ("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>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-bcm-iproc.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/pwm/pwm-bcm-iproc.c b/drivers/pwm/pwm-bcm-iproc.c index 31b01035d0ab..8cfba3614e60 100644 --- a/drivers/pwm/pwm-bcm-iproc.c +++ b/drivers/pwm/pwm-bcm-iproc.c @@ -85,8 +85,6 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, u64 tmp, multi, rate; u32 value, prescale; - rate = clk_get_rate(ip->clk); - value = readl(ip->base + IPROC_PWM_CTRL_OFFSET); if (value & BIT(IPROC_PWM_CTRL_EN_SHIFT(pwm->hwpwm))) @@ -99,6 +97,13 @@ static void iproc_pwmc_get_state(struct pwm_chip *chip, struct pwm_device *pwm, else state->polarity = PWM_POLARITY_INVERSED; + rate = clk_get_rate(ip->clk); + if (rate == 0) { + state->period = 0; + state->duty_cycle = 0; + return; + } + value = readl(ip->base + IPROC_PWM_PRESCALE_OFFSET); prescale = value >> IPROC_PWM_PRESCALE_SHIFT(pwm->hwpwm); prescale &= IPROC_PWM_PRESCALE_MAX; |