[RFT PATCH 04/15] drm/kmb: Call drm_atomic_helper_shutdown() at shutdown time

[Douglas Anderson]

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 at kernel.org>
Signed-off-by: Douglas Anderson <dianders at chromium.org>
---
This commit is only compile-time tested.

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

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index 24035b53441c..af9bd34fefc0 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -476,6 +476,11 @@ static int kmb_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void kmb_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static int kmb_probe(struct platform_device *pdev)
 {
 	struct device *dev = get_device(&pdev->dev);
@@ -622,6 +627,7 @@ static SIMPLE_DEV_PM_OPS(kmb_pm_ops, kmb_pm_suspend, kmb_pm_resume);
 static struct platform_driver kmb_platform_driver = {
 	.probe = kmb_probe,
 	.remove = kmb_remove,
+	.shutdown = kmb_shutdown,
 	.driver = {
 		.name = "kmb-drm",
 		.pm = &kmb_pm_ops,
-- 
2.42.0.283.g2d96d420d3-goog