From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Sascha Hauer <s.hauer@pengutronix.de>, Ahmad Fatoum <ahmad@a3f.at>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 08/12] video: backlight-pwm: use new pwm_apply_state API
Date: Tue, 31 Mar 2020 08:54:00 +0200 [thread overview]
Message-ID: <4c804252-b126-8555-dc8d-820b5a182b46@pengutronix.de> (raw)
In-Reply-To: <20200331061006.GG27288@pengutronix.de>
Hi,
On 3/31/20 8:10 AM, Sascha Hauer wrote:
> On Mon, Mar 30, 2020 at 04:57:13PM +0200, Ahmad Fatoum wrote:
>> From: Ahmad Fatoum <a.fatoum@pengutronix.de>
>>
>> Use pwm_apply_state we can avoid having to store PWM state in the
>> instance structure and in future we have an easy way to support new
>> parameters like inverted duty cycle.
>>
>> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
>> ---
>> drivers/video/backlight-pwm.c | 13 ++++++++-----
>> 1 file changed, 8 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/video/backlight-pwm.c b/drivers/video/backlight-pwm.c
>> index 9111a42d7544..8b6494dac929 100644
>> --- a/drivers/video/backlight-pwm.c
>> +++ b/drivers/video/backlight-pwm.c
>> @@ -33,7 +33,6 @@ struct pwm_backlight {
>> struct backlight_device backlight;
>> struct pwm_device *pwm;
>> struct regulator *power;
>> - uint32_t period;
>> unsigned int *levels;
>> int enable_gpio;
>> int enable_active_high;
>> @@ -91,13 +90,16 @@ static int backlight_pwm_disable(struct pwm_backlight *pwm_backlight)
>> static int compute_duty_cycle(struct pwm_backlight *pwm_backlight, int brightness)
>> {
>> int duty_cycle;
>> + struct pwm_state state;
>> +
>> + pwm_get_state(pwm_backlight->pwm, &state);
>>
>> if (pwm_backlight->levels)
>> duty_cycle = pwm_backlight->levels[brightness];
>> else
>> duty_cycle = brightness;
>>
>> - return duty_cycle * pwm_backlight->period / pwm_backlight->scale;
>> + return duty_cycle * state.period_ns / pwm_backlight->scale;
>> }
>>
>> static int backlight_pwm_set(struct backlight_device *backlight,
>> @@ -105,9 +107,11 @@ static int backlight_pwm_set(struct backlight_device *backlight,
>> {
>> struct pwm_backlight *pwm_backlight = container_of(backlight,
>> struct pwm_backlight, backlight);
>> + struct pwm_state state;
>>
>> - pwm_config(pwm_backlight->pwm, compute_duty_cycle(pwm_backlight, brightness),
>> - pwm_backlight->period);
>> + pwm_get_state(pwm_backlight->pwm, &state);
>
> You read the current pwm state here...
>
>> + state.duty_ns = compute_duty_cycle(pwm_backlight, brightness);
>
> and once again in compute_duty_cycle(). I think it would be nicer to
> reorganize this a bit, maybe pass the state to compute_duty_cycle.
>
>> + pwm_apply_state(pwm_backlight->pwm, &state);
>>
>> if (brightness)
>> return backlight_pwm_enable(pwm_backlight);
>
> I would assume that if you switch to the pwm_apply_state API then you do
> it entirely. backlight_pwm_enable() still uses the old API to enable the
> PWM.
Ineed. Rest of patches should apply and build cleanly without this and the last one.
If they're ok, can you apply them and I respin only those two?
Cheers
Ahmad
>
> Sascha
>
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next prev parent reply other threads:[~2020-03-31 6:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 14:57 [PATCH 00/12] PWM: add support for ->apply, polarity and STM32 Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 01/12] led: pwm: always initialize PWM LEDs as inactive Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 02/12] PWM: core: remove FLAG_ENABLED Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 03/12] PWM: core: remove ineffectual pwm_{set,get}_duty_cycle Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 04/12] PWM: core: group PWM state into new struct pwm_state Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 05/12] PWM: core: remove old PWM API in favor of Linux ->apply Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 06/12] PWM: core: retire pwm_set_period Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 07/12] PWM: core: apply initial state in of_pwm_request Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 08/12] video: backlight-pwm: use new pwm_apply_state API Ahmad Fatoum
2020-03-31 6:10 ` Sascha Hauer
2020-03-31 6:54 ` Ahmad Fatoum [this message]
2020-03-31 7:49 ` Sascha Hauer
2020-03-30 14:57 ` [PATCH 09/12] led: pwm: " Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 10/12] PWM: core: add apply API support for polarity Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 11/12] of: introduce of_property_count_elems_of_size Ahmad Fatoum
2020-03-30 14:57 ` [PATCH 12/12] PWM: add support for STM32 Ahmad Fatoum
2020-03-31 6:41 ` Sascha Hauer
2020-03-31 6:49 ` Ahmad Fatoum
2020-03-31 7:49 ` Sascha Hauer
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