diff options
| author | George Stark <gnstark@salutedevices.com> | 2024-04-25 20:12:52 +0300 |
|---|---|---|
| committer | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2024-04-30 19:57:08 +0300 |
| commit | 3e551115aee079931b82e1ec78c05f3d5033473f (patch) | |
| tree | ba150f6cfa88b306603e9d9d47145788c90c8807 /drivers/pwm | |
| parent | 6b2d60a543c4ffbb6bd9703a2714b2d5fbfc5781 (diff) | |
| download | linux-3e551115aee079931b82e1ec78c05f3d5033473f.tar.xz | |
pwm: meson: Add check for error from clk_round_rate()
clk_round_rate() can return not only zero if requested frequency can not
be provided but also negative error code so add check for it too.
Also change type of variable holding clk_round_rate() result from
unsigned long to long. It's safe due to clk_round_rate() returns long.
Fixes: 329db102a26d ("pwm: meson: make full use of common clock framework")
Signed-off-by: Dmitry Rokosov <ddrokosov@salutedevices.com>
Signed-off-by: George Stark <gnstark@salutedevices.com>
Link: https://lore.kernel.org/r/20240425171253.2752877-3-gnstark@salutedevices.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-meson.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index f4d70da621ec..4a652d500dfc 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -148,7 +148,7 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, struct meson_pwm *meson = to_meson_pwm(chip); struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm]; unsigned int cnt, duty_cnt; - unsigned long fin_freq; + long fin_freq; u64 duty, period, freq; duty = state->duty_cycle; @@ -168,12 +168,13 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm, freq = ULONG_MAX; fin_freq = clk_round_rate(channel->clk, freq); - if (fin_freq == 0) { - dev_err(pwmchip_parent(chip), "invalid source clock frequency\n"); - return -EINVAL; + if (fin_freq <= 0) { + dev_err(pwmchip_parent(chip), + "invalid source clock frequency %llu\n", freq); + return fin_freq ? fin_freq : -EINVAL; } - dev_dbg(pwmchip_parent(chip), "fin_freq: %lu Hz\n", fin_freq); + dev_dbg(pwmchip_parent(chip), "fin_freq: %ld Hz\n", fin_freq); cnt = div_u64(fin_freq * period, NSEC_PER_SEC); if (cnt > 0xffff) { |