[v4 2/4] drm/panel-simple: Support for delays between GPIO & regulator
From: Rajeev Nandan <hidden>
Date: 2021-05-25 07:31:40
Also in:
dri-devel, linux-arm-msm, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm panel drivers, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Neil Armstrong, Linus Torvalds
Some panels datasheets may specify a delay between the enable GPIO and the regulator. Support this in panel-simple. Signed-off-by: Rajeev Nandan <redacted> --- 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