From b77c9c14b36e4cdb819132382ad72540e051636c Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <digetx@gmail.com>
Date: Wed, 1 Dec 2021 02:23:22 +0300
Subject: drm/tegra: vic: Stop channel on suspend
Git-commit: 1e15f5b911d6a1b4a5677e88527610946bd314dd
Patch-mainline: v5.17-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

CDMA must be stopped before hardware is suspended. Add channel stopping
to RPM suspend callback. Add system level suspend-resume callbacks.

Runtime PM initialization is moved to host1x client init phase because
RPM callback now uses host1x channel that is available only when host1x
client is registered.

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/tegra/vic.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index 7d2b719ed8d1..8ea653860e1a 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -152,9 +152,13 @@ static int vic_init(struct host1x_client *client)
 		goto free_channel;
 	}
 
+	pm_runtime_enable(client->dev);
+	pm_runtime_use_autosuspend(client->dev);
+	pm_runtime_set_autosuspend_delay(client->dev, 500);
+
 	err = tegra_drm_register_client(tegra, drm);
 	if (err < 0)
-		goto free_syncpt;
+		goto disable_rpm;
 
 	/*
 	 * Inherit the DMA parameters (such as maximum segment size) from the
@@ -164,7 +168,10 @@ static int vic_init(struct host1x_client *client)
 
 	return 0;
 
-free_syncpt:
+disable_rpm:
+	pm_runtime_dont_use_autosuspend(client->dev);
+	pm_runtime_force_suspend(client->dev);
+
 	host1x_syncpt_put(client->syncpts[0]);
 free_channel:
 	host1x_channel_put(vic->channel);
@@ -189,10 +196,15 @@ static int vic_exit(struct host1x_client *client)
 	if (err < 0)
 		return err;
 
+	pm_runtime_dont_use_autosuspend(client->dev);
+	pm_runtime_force_suspend(client->dev);
+
 	host1x_syncpt_put(client->syncpts[0]);
 	host1x_channel_put(vic->channel);
 	host1x_client_iommu_detach(client);
 
+	vic->channel = NULL;
+
 	if (client->group) {
 		dma_unmap_single(vic->dev, vic->falcon.firmware.phys,
 				 vic->falcon.firmware.size, DMA_TO_DEVICE);
@@ -316,6 +328,8 @@ static int vic_runtime_suspend(struct device *dev)
 	struct vic *vic = dev_get_drvdata(dev);
 	int err;
 
+	host1x_channel_stop(vic->channel);
+
 	err = reset_control_assert(vic->rst);
 	if (err < 0)
 		return err;
@@ -483,19 +497,8 @@ static int vic_probe(struct platform_device *pdev)
 		goto exit_falcon;
 	}
 
-	pm_runtime_enable(&pdev->dev);
-	if (!pm_runtime_enabled(&pdev->dev)) {
-		err = vic_runtime_resume(&pdev->dev);
-		if (err < 0)
-			goto unregister_client;
-	}
-	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
-	pm_runtime_use_autosuspend(&pdev->dev);
-
 	return 0;
 
-unregister_client:
-	host1x_client_unregister(&vic->client.base);
 exit_falcon:
 	falcon_exit(&vic->falcon);
 
@@ -514,11 +517,6 @@ static int vic_remove(struct platform_device *pdev)
 		return err;
 	}
 
-	if (pm_runtime_enabled(&pdev->dev))
-		pm_runtime_disable(&pdev->dev);
-	else
-		vic_runtime_suspend(&pdev->dev);
-
 	falcon_exit(&vic->falcon);
 
 	return 0;
@@ -526,6 +524,8 @@ static int vic_remove(struct platform_device *pdev)
 
 static const struct dev_pm_ops vic_pm_ops = {
 	SET_RUNTIME_PM_OPS(vic_runtime_suspend, vic_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 };
 
 struct platform_driver tegra_vic_driver = {
-- 
2.38.1