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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: 329db102a2
("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>
This commit is contained in:
parent
6b2d60a543
commit
3e551115ae
@ -148,7 +148,7 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm,
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struct meson_pwm *meson = to_meson_pwm(chip);
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struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
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unsigned int cnt, duty_cnt;
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unsigned long fin_freq;
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long fin_freq;
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u64 duty, period, freq;
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duty = state->duty_cycle;
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@ -168,12 +168,13 @@ static int meson_pwm_calc(struct pwm_chip *chip, struct pwm_device *pwm,
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freq = ULONG_MAX;
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fin_freq = clk_round_rate(channel->clk, freq);
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if (fin_freq == 0) {
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dev_err(pwmchip_parent(chip), "invalid source clock frequency\n");
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return -EINVAL;
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if (fin_freq <= 0) {
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dev_err(pwmchip_parent(chip),
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"invalid source clock frequency %llu\n", freq);
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return fin_freq ? fin_freq : -EINVAL;
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}
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dev_dbg(pwmchip_parent(chip), "fin_freq: %lu Hz\n", fin_freq);
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dev_dbg(pwmchip_parent(chip), "fin_freq: %ld Hz\n", fin_freq);
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cnt = div_u64(fin_freq * period, NSEC_PER_SEC);
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if (cnt > 0xffff) {
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