From fb6593a0617734375cebd626296461a509e902e2 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Tue, 23 Mar 2021 02:09:53 +0200
Subject: [PATCH] drm: rcar-du: Shutdown the display on system shutdown
Git-commit: 015f2ebb93767d40c442e749642fffaf10316d78
Patch-mainline: v5.15-rc1
References: stable-5.14.6

[ Upstream commit 015f2ebb93767d40c442e749642fffaf10316d78 ]

When the system shuts down or warm reboots, the display may be active,
with the hardware accessing system memory. Upon reboot, the DDR will not
be accessible, which may cause issues.

Implement the platform_driver .shutdown() operation and shut down the
display to fix this.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/rcar-du/rcar_du_drv.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index c22551c2facb..2a06ec1cbefb 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -559,6 +559,13 @@ static int rcar_du_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void rcar_du_shutdown(struct platform_device *pdev)
+{
+	struct rcar_du_device *rcdu = platform_get_drvdata(pdev);
+
+	drm_atomic_helper_shutdown(&rcdu->ddev);
+}
+
 static int rcar_du_probe(struct platform_device *pdev)
 {
 	struct rcar_du_device *rcdu;
@@ -615,6 +622,7 @@ static int rcar_du_probe(struct platform_device *pdev)
 static struct platform_driver rcar_du_platform_driver = {
 	.probe		= rcar_du_probe,
 	.remove		= rcar_du_remove,
+	.shutdown	= rcar_du_shutdown,
 	.driver		= {
 		.name	= "rcar-du",
 		.pm	= &rcar_du_pm_ops,
-- 
2.26.2