Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-04 04:06:26 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
As the last call to spear_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: 98761ce4b9 ("pwm: spear: Implement .apply() callback")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2021-07-01 10:27:52 +02:00 committed by Thierry Reding
parent 65e2e6c1c2
commit fe8255f80b
1 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/pwm/pwm-spear.c
View File

@ -177,12 +177,9 @@ static int spear_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
return 0;
}
if (state->period != pwm->state.period ||
state->duty_cycle != pwm->state.duty_cycle) {
err = spear_pwm_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
}
err = spear_pwm_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
if (!pwm->state.enabled)
return spear_pwm_enable(chip, pwm);