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pwm: sprd: Ensure configuring period and duty_cycle isn't wrongly skipped 

[ Upstream commit 65e2e6c1c20104ed19060a38f4edbf14e9f9a9a5 ]

As the last call to sprd_pwm_apply() might have exited early if
state->enabled was false, the values for period and duty_cycle stored in
pwm->state might not have been written to hardware and it must be
ensured that they are configured before enabling the PWM.

Fixes: 8aae4b02e8 ("pwm: sprd: Add Spreadtrum PWM support")
Signed-off-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>
This commit is contained in:
Uwe Kleine-König 2021-07-01 10:27:51 +02:00 committed by Greg Kroah-Hartman
parent a37ca2a076
commit ae9b644344
1 changed files with 4 additions and 7 deletions
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11
drivers/pwm/pwm-sprd.c
View File

@ -180,13 +180,10 @@ static int sprd_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
}
}
if (state->period != cstate->period ||
state->duty_cycle != cstate->duty_cycle) {
ret = sprd_pwm_config(spc, pwm, state->duty_cycle,
state->period);
if (ret)
return ret;
}
ret = sprd_pwm_config(spc, pwm, state->duty_cycle,
state->period);
if (ret)
return ret;
sprd_pwm_write(spc, pwm->hwpwm, SPRD_PWM_ENABLE, 1);
} else if (cstate->enabled) {