diff options
| author |   Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> | 2020-07-17 21:46:06 -0700 |
|---|---|---|
| committer |   Thierry Reding <thierry.reding@gmail.com> | 2020-07-30 11:27:13 +0200 |
| commit | 6ced5ff0be8e94871ba846dfbddf69d21363f3d7 (patch) | |
| tree | 24be270333a2620ee11bdb3cde58769dc54f2c90 /drivers/pwm | |
| parent | pwm: Replace HTTP links with HTTPS ones (diff) | |
| download | wireguard-linux-6ced5ff0be8e94871ba846dfbddf69d21363f3d7.tar.xz wireguard-linux-6ced5ff0be8e94871ba846dfbddf69d21363f3d7.zip | |
pwm: bcm-iproc: handle clk_get_rate() return
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>
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 46f0a45e9049..79b1e58e946d 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; |