diff options
| author | Maxime Ripard <mripard@kernel.org> | 2019-10-03 17:38:50 +0300 |
|---|---|---|
| committer | Maxime Ripard <mripard@kernel.org> | 2019-10-03 17:38:50 +0300 |
| commit | 4092de1ba34eb376791809fb366bc15f8a9e0b7c (patch) | |
| tree | 6262d4dfcfa7ff9eda8e8d1d0a711711fcae8785 /drivers/pwm/pwm-stm32-lp.c | |
| parent | a00d17e0a71ae2e4fdaac46e1c12785d3346c3f2 (diff) | |
| parent | 54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c (diff) | |
| download | linux-4092de1ba34eb376791809fb366bc15f8a9e0b7c.tar.xz | |
Merge drm/drm-next into drm-misc-next
We haven't done any backmerge for a while due to the merge window, and it
starts to become an issue for komeda. Let's bring 5.4-rc1 in.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'drivers/pwm/pwm-stm32-lp.c')
| -rw-r--r-- | drivers/pwm/pwm-stm32-lp.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-stm32-lp.c b/drivers/pwm/pwm-stm32-lp.c index 2211a642066d..67fca62524dc 100644 --- a/drivers/pwm/pwm-stm32-lp.c +++ b/drivers/pwm/pwm-stm32-lp.c @@ -32,7 +32,7 @@ static inline struct stm32_pwm_lp *to_stm32_pwm_lp(struct pwm_chip *chip) #define STM32_LPTIM_MAX_PRESCALER 128 static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) + const struct pwm_state *state) { struct stm32_pwm_lp *priv = to_stm32_pwm_lp(chip); unsigned long long prd, div, dty; @@ -59,6 +59,12 @@ static int stm32_pwm_lp_apply(struct pwm_chip *chip, struct pwm_device *pwm, /* Calculate the period and prescaler value */ div = (unsigned long long)clk_get_rate(priv->clk) * state->period; do_div(div, NSEC_PER_SEC); + if (!div) { + /* Clock is too slow to achieve requested period. */ + dev_dbg(priv->chip.dev, "Can't reach %u ns\n", state->period); + return -EINVAL; + } + prd = div; while (div > STM32_LPTIM_MAX_ARR) { presc++; |