Some panels datasheets may specify a delay between the enable GPIO and
the regulator. Support this in panel-simple.
Signed-off-by: Rajeev Nandan <rajee...@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
