linux-kernel - [PATCH 5/6] Revert "drm/panel-simple: Support for delays between GPIO & regulator"

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Message-Id: <20210728094511.5.Ie44e3e5b7a926392541d575ca84c56931596513f@changeid>
Date:   Wed, 28 Jul 2021 09:45:56 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     dri-devel@...ts.freedesktop.org
Cc:     tzimmermann@...e.de, linux-arm-msm@...r.kernel.org,
        a.hajda@...sung.com, sam@...nborg.org, airlied@...ux.ie,
        bjorn.andersson@...aro.org, daniel@...ll.ch,
        devicetree@...r.kernel.org, rodrigo.vivi@...el.com,
        jonas@...boo.se, narmstrong@...libre.com,
        Laurent.pinchart@...asonboard.com, robert.foss@...aro.org,
        jernej.skrabec@...il.com, mripard@...nel.org,
        linus.walleij@...aro.org, maarten.lankhorst@...ux.intel.com,
        rajeevny@...eaurora.org, lyude@...hat.com,
        thierry.reding@...il.com, steev@...i.org,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] Revert "drm/panel-simple: Support for delays between GPIO & regulator"

This reverts commit 18a1488bf1e13fc3fc96d7948466b2166067c6c8.

Those delays were added to support the Samsung ATNA33XC20
panel. However, we've moving that to its own panel driver and out of
panel-simple. That means we don't need the ability to specify this
delay.

NOTE: it's unlikely we want to keep this delay "just in case" some
other panel needs it. The enable-gpio and the power supply are really
supposed to be different ways to specify the same thing: the main
enable of the panel. Supporting a delay between them doesn't really
make sense.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/gpu/drm/panel/panel-simple.c | 28 ----------------------------
 1 file changed, 28 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index c8694f7f8e0f..ff8b59471c71 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -132,22 +132,6 @@ 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.
 		 *
@@ -363,10 +347,6 @@ 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();
 
@@ -427,9 +407,6 @@ 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;
@@ -803,11 +780,6 @@ 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);
 
 	/*
-- 
2.32.0.432.gabb21c7263-goog