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    Subject[v4 2/4] drm/panel-simple: Support for delays between GPIO & regulator
    Date
    Some panels datasheets may specify a delay between the enable GPIO and
    the regulator. Support this in panel-simple.

    Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
    ---

    Changes in v4:
    - New

    drivers/gpu/drm/panel/panel-simple.c | 23 +++++++++++++++++++++++
    1 file changed, 23 insertions(+)

    diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
    index f9e4e60..caed71b 100644
    --- a/drivers/gpu/drm/panel/panel-simple.c
    +++ b/drivers/gpu/drm/panel/panel-simple.c
    @@ -134,6 +134,22 @@ struct panel_desc {
    unsigned int prepare_to_enable;

    /**
    + * @delay.power_to_enable: Time for the power to enable the display on.
    + *
    + * The time (in milliseconds) that it takes for the panel to
    + * turn the display on.
    + */
    + unsigned int power_to_enable;
    +
    + /**
    + * @delay.disable_to_power_off: Time for the disable to power the display off.
    + *
    + * The time (in milliseconds) that it takes for the panel to
    + * turn the display off.
    + */
    + unsigned int disable_to_power_off;
    +
    + /**
    * @delay.enable: Time for the panel to display a valid frame.
    *
    * The time (in milliseconds) that it takes for the panel to
    @@ -367,6 +383,10 @@ static int panel_simple_suspend(struct device *dev)
    struct panel_simple *p = dev_get_drvdata(dev);

    gpiod_set_value_cansleep(p->enable_gpio, 0);
    +
    + if (p->desc->delay.disable_to_power_off)
    + msleep(p->desc->delay.disable_to_power_off);
    +
    regulator_disable(p->supply);
    p->unprepared_time = ktime_get();

    @@ -427,6 +447,9 @@ static int panel_simple_prepare_once(struct panel_simple *p)
    return err;
    }

    + if (p->desc->delay.power_to_enable)
    + msleep(p->desc->delay.power_to_enable);
    +
    gpiod_set_value_cansleep(p->enable_gpio, 1);

    delay = p->desc->delay.prepare;
    --
    2.7.4
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