linux-kernel - [PATCH v2 4/8] drm/arcpgu: Call drm_atomic_helper

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Message-ID: <20240612152336.v2.4.I8a0a246fea222059881d01a8fff2adcf7ef3d7a4@changeid>
Date: Wed, 12 Jun 2024 15:23:44 -0700
From: Douglas Anderson <dianders@...omium.org>
To: dri-devel@...ts.freedesktop.org,
	Maxime Ripard <mripard@...nel.org>
Cc: Douglas Anderson <dianders@...omium.org>,
	Alexey Brodkin <abrodkin@...opsys.com>,
	Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/8] drm/arcpgu: Call drm_atomic_helper_shutdown() at shutdown time

Based on grepping through the source code this driver appears to be
missing a call to drm_atomic_helper_shutdown() at system shutdown
time. Among other things, this means that if a panel is in use that it
won't be cleanly powered off at system shutdown time.

The fact that we should call drm_atomic_helper_shutdown() in the case
of OS shutdown/restart comes straight out of the kernel doc "driver
instance overview" in drm_drv.c.

Suggested-by: Maxime Ripard <mripard@...nel.org>
Reviewed-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
This commit is only compile-time tested.

(no changes since v1)

 drivers/gpu/drm/tiny/arcpgu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/tiny/arcpgu.c b/drivers/gpu/drm/tiny/arcpgu.c
index 4f8f3172379e..85b21f5aac55 100644
--- a/drivers/gpu/drm/tiny/arcpgu.c
+++ b/drivers/gpu/drm/tiny/arcpgu.c
@@ -412,6 +412,11 @@ static void arcpgu_remove(struct platform_device *pdev)
 	arcpgu_unload(drm);
 }
 
+static void arcpgu_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id arcpgu_of_table[] = {
 	{.compatible = "snps,arcpgu"},
 	{}
@@ -422,6 +427,7 @@ MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 static struct platform_driver arcpgu_platform_driver = {
 	.probe = arcpgu_probe,
 	.remove_new = arcpgu_remove,
+	.shutdown = arcpgu_shutdown,
 	.driver = {
 		   .name = "arcpgu",
 		   .of_match_table = arcpgu_of_table,
-- 
2.45.2.505.gda0bf45e8d-goog