Re: [PATCH v2 2/2] drm/tegra: gr2d/gr3d: Contain PM in the gr*d_probe/gr*d_remove

[Svyatoslav Ryhel <clamor95@gmail.com>]

нд, 3 трав. 2026 р. о 19:38 Svyatoslav Ryhel <clamor95@gmail.com> пише:
>
> From: Ion Agorria <ion@agorria.com>
>
> The current power management configuration causes GR2G/GR3D to malfunction
> after resume. Reconfigure all PM actions to be handled within the GR*D
> probe and remove operations to address this.
>
> Fixes: 62fa0a985e2c ("drm/tegra: Enable runtime PM during probe")
> Acked-by: Mikko Perttunen <mperttunen@nvidia.com>
> Signed-off-by: Ion Agorria <ion@agorria.com>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
>  drivers/gpu/drm/tegra/gr2d.c | 11 ++++-------
>  drivers/gpu/drm/tegra/gr3d.c | 11 ++++-------
>  2 files changed, 8 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/tegra/gr2d.c b/drivers/gpu/drm/tegra/gr2d.c
> index e4148b034af7..ffcd076b5831 100644
> --- a/drivers/gpu/drm/tegra/gr2d.c
> +++ b/drivers/gpu/drm/tegra/gr2d.c
> @@ -100,9 +100,6 @@ static int gr2d_exit(struct host1x_client *client)
>         if (err < 0)
>                 return err;
>
> -       pm_runtime_dont_use_autosuspend(client->dev);
> -       pm_runtime_force_suspend(client->dev);
> -
>         host1x_client_iommu_detach(client);
>         host1x_syncpt_put(client->syncpts[0]);
>         host1x_channel_put(gr2d->channel);
> @@ -286,6 +283,10 @@ static int gr2d_probe(struct platform_device *pdev)
>                 return err;
>         }
>
> +       pm_runtime_enable(dev);
> +       pm_runtime_use_autosuspend(dev);
> +       pm_runtime_set_autosuspend_delay(dev, 500);
> +

Hello Mikko!

I have used same setup as in VIC. May you please take a look to sashiko's check
https://sashiko.dev/#/patchset/20260502124055.22475-1-clamor95%40gmail.com

I do agree with statement that pm_runtime_enable should be before
host1x_client_register since this same approach is widely used in the
media subsystem too.

But I am more interested in your thoughts regarding sashiko's
gr2d_exit situation reasoning.

Thank you!

>         return 0;
>  }
>
> @@ -367,10 +368,6 @@ 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 47b0c6c56bfd..cd5554e2117f 100644
> --- a/drivers/gpu/drm/tegra/gr3d.c
> +++ b/drivers/gpu/drm/tegra/gr3d.c
> @@ -109,9 +109,6 @@ static int gr3d_exit(struct host1x_client *client)
>         if (err < 0)
>                 return err;
>
> -       pm_runtime_dont_use_autosuspend(client->dev);
> -       pm_runtime_force_suspend(client->dev);
> -
>         host1x_client_iommu_detach(client);
>         host1x_syncpt_put(client->syncpts[0]);
>         host1x_channel_put(gr3d->channel);
> @@ -517,6 +514,10 @@ static int gr3d_probe(struct platform_device *pdev)
>                 return err;
>         }
>
> +       pm_runtime_enable(&pdev->dev);
> +       pm_runtime_use_autosuspend(&pdev->dev);
> +       pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
> +
>         return 0;
>  }
>
> @@ -578,10 +579,6 @@ 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:
> --
> 2.51.0
>