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drm/panel-simple: Support for delays between GPIO & regulator

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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>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1624726268-14869-4-git-send-email-rajeevny@codeaurora.org
This commit is contained in:
Rajeev Nandan 2021-06-26 22:21:05 +05:30 committed by Douglas Anderson
parent bfd451403d
commit 18a1488bf1
1 changed files with 28 additions and 0 deletions
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28
drivers/gpu/drm/panel/panel-simple.c
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@ -132,6 +132,22 @@ 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) to wait after powering up the display
* before asserting its enable pin.
*/
unsigned int power_to_enable;
/**
* @delay.disable_to_power_off: Time for the disable to power the display off.
*
* The time (in milliseconds) to wait before powering off the display
* after deasserting its enable pin.
*/
unsigned int disable_to_power_off;
/**
* @delay.enable: Time for the panel to display a valid frame.
*
@ -347,6 +363,10 @@ 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();
@ -407,6 +427,9 @@ 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;
@ -782,6 +805,11 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc,
break;
}
if (!panel->enable_gpio && desc->delay.disable_to_power_off)
dev_warn(dev, "Need a delay after disabling panel GPIO, but a GPIO wasn't provided\n");
if (!panel->enable_gpio && desc->delay.power_to_enable)
dev_warn(dev, "Need a delay before enabling panel GPIO, but a GPIO wasn't provided\n");
dev_set_drvdata(dev, panel);
/*