[PATCH v4 3/5] pwm-backlight: add support for PWM delays proprieties.

[Enric Balletbo Serra]

Hi,

2017-07-26 19:01 GMT+02:00 Jingoo Han <jingoohan1 at gmail.com>:
> On Monday, July 24, 2017 11:22 AM, Daniel Thompson wrote:
>> On 21/07/17 11:48, Enric Balletbo i Serra wrote:
>> > Some panels (i.e. N116BGE-L41), in their power sequence specifications,
>> > request a delay between set the PWM signal and enable the backlight and
>> > between clear the PWM signal and disable the backlight. Add support for
>> > the new post-pwm-on-delay-ms and pwm-off-delay-ms proprieties to meet
>> > the timings.
>> >
>> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo at collabora.com>
>>
>> Acked-by: Daniel Thompson <daniel.thompson at linaro.org>
>
> Acked-by: Jingoo Han <jingoohan1 at gmail.com>
>

A lot of time has passed since these patches received the acks but I'm
still without seeing the patches in linux-next. There is some action I
need to do ? (rebase?). I'd really like to see those to land in next
merge window if all is ok.

Thanks,
 Enric

> Best regards,
> Jingoo Han
>
>>
>>
>> > ---
>> > Changes since v3:
>> >   - Use two named members instead of pwm_delay[] (Daniel and Pavel)
>> >   - Use msleep instead of usleep_range. (Pavel)
>> > Changes since v2:
>> >   - Move the pwm/enable sequence to another patch (Thierry Reding)
>> > Changes since v1:
>> >   - As suggested by Daniel Thompson
>> >     - Do not assume power-on delay and power-off delay will be the same
>> >   - Move the check of dt property to the parse dt function.
>> >
>> >   drivers/video/backlight/pwm_bl.c | 19 +++++++++++++++++++
>> >   include/linux/pwm_backlight.h    |  2 ++
>> >   2 files changed, 21 insertions(+)
>> >
>> > diff --git a/drivers/video/backlight/pwm_bl.c
>> b/drivers/video/backlight/pwm_bl.c
>> > index 909a686..6cf6109 100644
>> > --- a/drivers/video/backlight/pwm_bl.c
>> > +++ b/drivers/video/backlight/pwm_bl.c
>> > @@ -10,6 +10,7 @@
>> >    * published by the Free Software Foundation.
>> >    */
>> >
>> > +#include <linux/delay.h>
>> >   #include <linux/gpio/consumer.h>
>> >   #include <linux/gpio.h>
>> >   #include <linux/module.h>
>> > @@ -35,6 +36,8 @@ struct pwm_bl_data {
>> >     struct gpio_desc        *enable_gpio;
>> >     unsigned int            scale;
>> >     bool                    legacy;
>> > +   unsigned int            post_pwm_on_delay;
>> > +   unsigned int            pwm_off_delay;
>> >     int                     (*notify)(struct device *,
>> >                                       int brightness);
>> >     void                    (*notify_after)(struct device *,
>> > @@ -56,6 +59,9 @@ static void pwm_backlight_power_on(struct pwm_bl_data
>> *pb, int brightness)
>> >
>> >     pwm_enable(pb->pwm);
>> >
>> > +   if (pb->post_pwm_on_delay)
>> > +           msleep(pb->post_pwm_on_delay);
>> > +
>> >     if (pb->enable_gpio)
>> >             gpiod_set_value_cansleep(pb->enable_gpio, 1);
>> >
>> > @@ -70,6 +76,9 @@ static void pwm_backlight_power_off(struct pwm_bl_data
>> *pb)
>> >     if (pb->enable_gpio)
>> >             gpiod_set_value_cansleep(pb->enable_gpio, 0);
>> >
>> > +   if (pb->pwm_off_delay)
>> > +           msleep(pb->pwm_off_delay);
>> > +
>> >     pwm_config(pb->pwm, 0, pb->period);
>> >     pwm_disable(pb->pwm);
>> >
>> > @@ -175,6 +184,14 @@ static int pwm_backlight_parse_dt(struct device
>> *dev,
>> >             data->max_brightness--;
>> >     }
>> >
>> > +   /*
>> > +    * These values are optional and set as 0 by default, the out
>> values
>> > +    * are modified only if a valid u32 value can be decoded.
>> > +    */
>> > +   of_property_read_u32(node, "post-pwm-on-delay-ms",
>> > +                        &data->post_pwm_on_delay);
>> > +   of_property_read_u32(node, "pwm-off-delay-ms", &data-
>> >pwm_off_delay);
>> > +
>> >     data->enable_gpio = -EINVAL;
>> >     return 0;
>> >   }
>> > @@ -273,6 +290,8 @@ static int pwm_backlight_probe(struct
>> platform_device *pdev)
>> >     pb->exit = data->exit;
>> >     pb->dev = &pdev->dev;
>> >     pb->enabled = false;
>> > +   pb->post_pwm_on_delay = data->post_pwm_on_delay;
>> > +   pb->pwm_off_delay = data->pwm_off_delay;
>> >
>> >     pb->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
>> >                                               GPIOD_ASIS);
>> > diff --git a/include/linux/pwm_backlight.h
>> b/include/linux/pwm_backlight.h
>> > index efdd922..62f59c4 100644
>> > --- a/include/linux/pwm_backlight.h
>> > +++ b/include/linux/pwm_backlight.h
>> > @@ -13,6 +13,8 @@ struct platform_pwm_backlight_data {
>> >     unsigned int lth_brightness;
>> >     unsigned int pwm_period_ns;
>> >     unsigned int *levels;
>> > +   unsigned int post_pwm_on_delay;
>> > +   unsigned int pwm_off_delay;
>> >     /* TODO remove once all users are switched to gpiod_* API */
>> >     int enable_gpio;
>> >     int (*init)(struct device *dev);
>> >
>
>