From cda0fc9ebcf23137c861d5af84bf7c26a744481a Mon Sep 17 00:00:00 2001
From: Zhibin Huang <zhibin.huang@rock-chips.com>
Date: Tue, 16 Apr 2024 20:33:13 +0800
Subject: [PATCH] drm/panel: panel-simple: add panel notifier for tp
 resume/suspend

The tp of some screens has strict timing requirements (especially the
display and tp are integrated on a screen IC), while kernel-6.1 does
not have fb function. The notifier is added to correlate the sleep and
wake-up timing of display and tp. For screens with low requirements
for tp and display timing, you can choose whether to use it to notify
on wake-up and sleep.

Type: Function
Redmine ID: #474634 #468692
Associated modifications: N/A
Test: N/A

Signed-off-by: Zhibin Huang <zhibin.huang@rock-chips.com>
Change-Id: I11cb63564fce97b6ca6b02cf12bc19db5d82124b
---
 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 b38b48fc378e..2ba0ab03c2bf 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -31,6 +31,7 @@
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 #include <linux/spi/spi.h>
+#include <linux/rockchip-panel-notifier.h>
 
 #include <video/display_timing.h>
 #include <video/mipi_display.h>
@@ -217,6 +218,8 @@ struct panel_simple {
 
 	struct drm_dsc_picture_parameter_set *pps;
 	enum drm_panel_orientation orientation;
+
+	struct rockchip_panel_notifier panel_notifier;
 };
 
 static inline void panel_simple_msleep(unsigned int msecs)
@@ -530,6 +533,9 @@ int panel_simple_loader_protect(struct drm_panel *panel)
 	p->prepared = true;
 	p->enabled = true;
 
+	rockchip_panel_notifier_call_chain(&p->panel_notifier,
+					   PANEL_ENABLED, NULL);
+
 	return 0;
 }
 EXPORT_SYMBOL(panel_simple_loader_protect);
@@ -538,6 +544,13 @@ static int panel_simple_disable(struct drm_panel *panel)
 {
 	struct panel_simple *p = to_panel_simple(panel);
 
+	/*
+	 * notify other devices (such as TP) to perform the action before the
+	 * panel is disabled.
+	 */
+	rockchip_panel_notifier_call_chain(&p->panel_notifier,
+					   PANEL_PRE_DISABLE, NULL);
+
 	if (!p->enabled)
 		return 0;
 
@@ -641,6 +654,13 @@ static int panel_simple_enable(struct drm_panel *panel)
 
 	p->enabled = true;
 
+	/*
+	 * notify other devices (such as TP) to perform the action after the
+	 * panel is enabled.
+	 */
+	rockchip_panel_notifier_call_chain(&p->panel_notifier,
+					   PANEL_ENABLED, NULL);
+
 	return 0;
 }
 
@@ -973,6 +993,9 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
 
 	dev_set_drvdata(dev, panel);
 
+	devm_rockchip_panel_notifier_register(dev, &panel->base,
+					      &panel->panel_notifier);
+
 	drm_panel_init(&panel->base, dev, &panel_simple_funcs, connector_type);
 
 	err = drm_panel_of_backlight(&panel->base);