diff mbox series

drm/tegra: Enable runtime PM during probe

Message ID 20230613095215.2497004-1-cyndis@kapsi.fi
State Accepted
Headers show
Series drm/tegra: Enable runtime PM during probe | expand

Commit Message

Mikko Perttunen June 13, 2023, 9:52 a.m. UTC 
From: Mikko Perttunen <mperttunen@nvidia.com>

Currently, engine drivers only enable runtime PM during the host1x
init callback. This can happen slightly later than the probe, which
can cause the power domain to intermittently not be turned off after
probe.

My hypothesis is that there is a race condition between the post-probe
power domain poweroff that is done from a queued work, and the
pm_runtime_enable call happening in the host1x init callback.
If the pm_runtime_enable call happens first, everything is OK and
the power off work can disable the power domain as PM runtime is
enabled and the device is runtime suspended. If power off work runs
first, PM runtime is still disabled for the device and the domain
must be kept powered.

Resolve the issue by moving the runtime PM enablement to the
probe function.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
---
 drivers/gpu/drm/tegra/gr2d.c  | 16 +++++++---------
 drivers/gpu/drm/tegra/gr3d.c  | 16 +++++++---------
 drivers/gpu/drm/tegra/nvdec.c | 17 +++++++----------
 drivers/gpu/drm/tegra/vic.c   | 17 +++++++----------
 4 files changed, 28 insertions(+), 38 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
index 50f77fddda54..56468268df21 100644
--- a/drivers/gpu/drm/tegra/gr2d.c
+++ b/drivers/gpu/drm/tegra/gr2d.c
@@ -70,22 +70,15 @@  static int gr2d_init(struct host1x_client *client)
 		goto free;
 	}
 
-	pm_runtime_enable(client->dev);
-	pm_runtime_use_autosuspend(client->dev);
-	pm_runtime_set_autosuspend_delay(client->dev, 200);
-
 	err = tegra_drm_register_client(dev->dev_private, drm);
 	if (err < 0) {
 		dev_err(client->dev, "failed to register client: %d\n", err);
-		goto disable_rpm;
+		goto detach_iommu;
 	}
 
 	return 0;
 
-disable_rpm:
-	pm_runtime_dont_use_autosuspend(client->dev);
-	pm_runtime_force_suspend(client->dev);
-
+detach_iommu:
 	host1x_client_iommu_detach(client);
 free:
 	host1x_syncpt_put(client->syncpts[0]);
@@ -299,6 +292,7 @@  static void gr2d_remove(struct platform_device *pdev)
 {
 	struct gr2d *gr2d = platform_get_drvdata(pdev);
 
+	pm_runtime_disable(&pdev->dev);
 	host1x_client_unregister(&gr2d->client.base);
 }
 
@@ -372,6 +366,10 @@  static int __maybe_unused gr2d_runtime_resume(struct device *dev)
 		goto disable_clk;
 	}
 
+	pm_runtime_enable(dev);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, 500);
+
 	return 0;
 
 disable_clk:
diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
index c026c2c916c1..46d213620b70 100644
--- a/drivers/gpu/drm/tegra/gr3d.c
+++ b/drivers/gpu/drm/tegra/gr3d.c
@@ -80,22 +80,15 @@  static int gr3d_init(struct host1x_client *client)
 		goto free;
 	}
 
-	pm_runtime_enable(client->dev);
-	pm_runtime_use_autosuspend(client->dev);
-	pm_runtime_set_autosuspend_delay(client->dev, 200);
-
 	err = tegra_drm_register_client(dev->dev_private, drm);
 	if (err < 0) {
 		dev_err(client->dev, "failed to register client: %d\n", err);
-		goto disable_rpm;
+		goto detach_iommu;
 	}
 
 	return 0;
 
-disable_rpm:
-	pm_runtime_dont_use_autosuspend(client->dev);
-	pm_runtime_force_suspend(client->dev);
-
+detach_iommu:
 	host1x_client_iommu_detach(client);
 free:
 	host1x_syncpt_put(client->syncpts[0]);
@@ -554,6 +547,7 @@  static void gr3d_remove(struct platform_device *pdev)
 {
 	struct gr3d *gr3d = platform_get_drvdata(pdev);
 
+	pm_runtime_disable(&pdev->dev);
 	host1x_client_unregister(&gr3d->client.base);
 }
 
@@ -607,6 +601,10 @@  static int __maybe_unused gr3d_runtime_resume(struct device *dev)
 		goto disable_clk;
 	}
 
+	pm_runtime_enable(dev);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, 500);
+
 	return 0;
 
 disable_clk:
diff --git a/drivers/gpu/drm/tegra/nvdec.c b/drivers/gpu/drm/tegra/nvdec.c
index ae78a81e5eef..2bc75f4d539f 100644
--- a/drivers/gpu/drm/tegra/nvdec.c
+++ b/drivers/gpu/drm/tegra/nvdec.c
@@ -177,13 +177,9 @@  static int nvdec_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 disable_rpm;
+		goto free_syncpt;
 
 	/*
 	 * Inherit the DMA parameters (such as maximum segment size) from the
@@ -193,10 +189,7 @@  static int nvdec_init(struct host1x_client *client)
 
 	return 0;
 
-disable_rpm:
-	pm_runtime_dont_use_autosuspend(client->dev);
-	pm_runtime_force_suspend(client->dev);
-
+free_syncpt:
 	host1x_syncpt_put(client->syncpts[0]);
 free_channel:
 	host1x_channel_put(nvdec->channel);
@@ -539,6 +532,10 @@  static int nvdec_probe(struct platform_device *pdev)
 		goto exit_falcon;
 	}
 
+	pm_runtime_enable(dev);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, 500);
+
 	return 0;
 
 exit_falcon:
@@ -551,8 +548,8 @@  static void nvdec_remove(struct platform_device *pdev)
 {
 	struct nvdec *nvdec = platform_get_drvdata(pdev);
 
+	pm_runtime_disable(&pdev->dev);
 	host1x_client_unregister(&nvdec->client.base);
-
 	falcon_exit(&nvdec->falcon);
 }
 
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index da7a038dca20..19125406cf32 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -143,13 +143,9 @@  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 disable_rpm;
+		goto free_syncpt;
 
 	/*
 	 * Inherit the DMA parameters (such as maximum segment size) from the
@@ -159,10 +155,7 @@  static int vic_init(struct host1x_client *client)
 
 	return 0;
 
-disable_rpm:
-	pm_runtime_dont_use_autosuspend(client->dev);
-	pm_runtime_force_suspend(client->dev);
-
+free_syncpt:
 	host1x_syncpt_put(client->syncpts[0]);
 free_channel:
 	host1x_channel_put(vic->channel);
@@ -529,6 +522,10 @@  static int vic_probe(struct platform_device *pdev)
 		goto exit_falcon;
 	}
 
+	pm_runtime_enable(dev);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, 500);
+
 	return 0;
 
 exit_falcon:
@@ -541,8 +538,8 @@  static void vic_remove(struct platform_device *pdev)
 {
 	struct vic *vic = platform_get_drvdata(pdev);
 
+	pm_runtime_disable(&pdev->dev);
 	host1x_client_unregister(&vic->client.base);
-
 	falcon_exit(&vic->falcon);
 }