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drm/tegra: Enable runtime PM during probe 

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>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230613095215.2497004-1-cyndis@kapsi.fi
This commit is contained in:
Mikko Perttunen 2023-06-13 12:52:14 +03:00 committed by Thierry Reding
parent 3c5a5df9c3
commit 62fa0a985e
4 changed files with 28 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/tegra/gr2d.c
View File

@ -71,22 +71,15 @@ 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]);
@ -300,6 +293,7 @@ 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);
}
@ -373,6 +367,10 @@ 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:

16
drivers/gpu/drm/tegra/gr3d.c
View File

@ -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:

17
drivers/gpu/drm/tegra/nvdec.c
View File

@ -175,13 +175,9 @@ 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
@ -191,10 +187,7 @@ 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);
}

17
drivers/gpu/drm/tegra/vic.c
View File

@ -141,13 +141,9 @@ 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
@ -157,10 +153,7 @@ 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);
@ -527,6 +520,10 @@ 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:
@ -539,8 +536,8 @@ 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);
}