Re: [PATCH v5 06/16] pwm: lpss: Use pwm_lpss_apply() when restoring state on resume

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 7/29/20 10:12 AM, Andy Shevchenko wrote:
> On Tue, Jul 28, 2020 at 09:55:22PM +0200, Hans de Goede wrote:
>> On 7/28/20 8:57 PM, Andy Shevchenko wrote:
>>> On Fri, Jul 17, 2020 at 03:37:43PM +0200, Hans de Goede wrote:
> 
> ...
> 
>>> Maybe I'm too picky, but I would go even further and split apply to two versions
>>>
>>> static int pwm_lpss_apply_on_resume(struct pwm_chip *chip, struct pwm_device *pwm,
>>> 			  const struct pwm_state *state)
>>>>    {
>>>>    	struct pwm_lpss_chip *lpwm = to_lpwm(chip);
>>>>    	if (state->enabled)
>>>>    		return pwm_lpss_prepare_enable(lpwm, pwm, state, !pwm_is_enabled(pwm));
>>>>    	if (pwm_is_enabled(pwm)) {
>>>>    		pwm_lpss_write(pwm, pwm_lpss_read(pwm) & ~PWM_ENABLE);
>>>>    	return 0;
>>>>    }
>>>
>>> and another one for !from_resume.
>>
>> It is a bit picky :) But that is actually not a bad idea, although I would write
>> it like this for more symmetry with the normal (not on_resume) apply version,
>> while at it I also renamed the function:
>>
>> /*
>>   * This is a mirror of pwm_lpss_apply() without pm_runtime reference handling
>>   * for restoring the PWM state on resume.
>>   */
>> static int pwm_lpss_restore_state(struct pwm_chip *chip, struct pwm_device *pwm,
>>                                    const struct pwm_state *state)
>> {
>>     	struct pwm_lpss_chip *lpwm = to_lpwm(chip);
>> 	int ret = 0;
>>
>>     	if (state->enabled)
>>     		ret = pwm_lpss_prepare_enable(lpwm, pwm, state, !pwm_is_enabled(pwm));
>>     	else if (pwm_is_enabled(pwm))
>>     		pwm_lpss_write(pwm, pwm_lpss_read(pwm) & ~PWM_ENABLE);
>>
>>     	return ret;
>> }
>>
>> Would that work for you?
> 
> Yes.

Ok, I've added the suggested/discussed helper in my personal tree. Is it ok
if I add your Reviewed-by with that change in place. This is the last unreviewed
bit, so I would rather not respin the series just for this (there will be one
more respin when I rebase it on 5.9-rc1).

If you want to check out what the patch looks like now, the new version from
my personal tree is here:

https://github.com/jwrdegoede/linux-sunxi/commit/e4869830d88bb8cb8251718e0086ac189abc0f56

Regards,

Hans