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pwm: Fixes for v4.7-rc6 

One more fix for some fallout observed after the introduction of the
 atomic API.
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Merge tag 'pwm/for-4.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm fixes from Thierry Reding:
 "One more fix for some fallout observed after the introduction of the
  atomic API"

* tag 'pwm/for-4.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: Fix pwm_apply_args()
This commit is contained in:
Linus Torvalds 2016-06-30 09:49:26 -07:00
parent 4aa34ce3c1 33cdcee04b
commit 20bfdca199
1 changed files with 10 additions and 6 deletions
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16
include/linux/pwm.h
View File

@ -464,6 +464,8 @@ static inline bool pwm_can_sleep(struct pwm_device *pwm)
static inline void pwm_apply_args(struct pwm_device *pwm)
{
struct pwm_state state = { };
/*
* PWM users calling pwm_apply_args() expect to have a fresh config
* where the polarity and period are set according to pwm_args info.
@ -476,18 +478,20 @@ static inline void pwm_apply_args(struct pwm_device *pwm)
* at startup (even if they are actually enabled), thus authorizing
* polarity setting.
*
* Instead of setting ->enabled to false, we call pwm_disable()
* before pwm_set_polarity() to ensure that everything is configured
* as expected, and the PWM is really disabled when the user request
* it.
* To fulfill this requirement, we apply a new state which disables
* the PWM device and set the reference period and polarity config.
*
* Note that PWM users requiring a smooth handover between the
* bootloader and the kernel (like critical regulators controlled by
* PWM devices) will have to switch to the atomic API and avoid calling
* pwm_apply_args().
*/
pwm_disable(pwm);
pwm_set_polarity(pwm, pwm->args.polarity);
state.enabled = false;
state.polarity = pwm->args.polarity;
state.period = pwm->args.period;
pwm_apply_state(pwm, &state);
}
struct pwm_lookup {