linux-kernel - [v4 2/4] drm/panel-simple: Support for delays between GPIO & regulator

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Message-Id: <1621927831-29471-3-git-send-email-rajeevny@codeaurora.org>
Date:   Tue, 25 May 2021 13:00:29 +0530
From:   Rajeev Nandan <rajeevny@...eaurora.org>
To:     y@...lcomm.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Cc:     Rajeev Nandan <rajeevny@...eaurora.org>,
        linux-kernel@...r.kernel.org, thierry.reding@...il.com,
        sam@...nborg.org, robdclark@...il.com, dianders@...omium.org,
        lyude@...hat.com, jani.nikula@...el.com, robh@...nel.org,
        laurent.pinchart@...asonboard.com, a.hajda@...sung.com,
        daniel.thompson@...aro.org, hoegsberg@...omium.org,
        abhinavk@...eaurora.org, seanpaul@...omium.org,
        kalyan_t@...eaurora.org, mkrishn@...eaurora.org
Subject: [v4 2/4] drm/panel-simple: Support for delays between GPIO & regulator

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@...eaurora.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