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gpu: host1x: Allow loading tegra-drm without enabled engines

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Add support to register host1x devices without requiring subdevices.
This ensures syncpoint functionality remains available even when engine
subdevices are not present.

Add softdep for tegra-drm to make userspace interface available
without module autoloading through device tree entries.

Signed-off-by: Vamsee Vardhan Thummala <vthummala@nvidia.com>
[mperttunen@nvidia.com: some rewording]
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20250708-host1x-allow-no-subdevs-v1-1-93c66c251f03@nvidia.com
This commit is contained in:
Vamsee Vardhan Thummala
2025-07-08 21:18:08 +09:00
committed by Thierry Reding
parent 63d47cc6ee
commit fab823d82e
2 changed files with 13 additions and 0 deletions
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12
drivers/gpu/host1x/bus.c
View File

@@ -471,6 +471,18 @@ static int host1x_device_add(struct host1x *host1x,
mutex_unlock(&clients_lock);
/*
* Add device even if there are no subdevs to ensure syncpoint functionality
* is available regardless of whether any engine subdevices are present
*/
if (list_empty(&device->subdevs)) {
err = device_add(&device->dev);
if (err < 0)
dev_err(&device->dev, "failed to add device: %d\n", err);
else
device->registered = true;
}
return 0;
}

1
drivers/gpu/host1x/dev.c
View File

@@ -821,6 +821,7 @@ u64 host1x_get_dma_mask(struct host1x *host1x)
}
EXPORT_SYMBOL(host1x_get_dma_mask);
MODULE_SOFTDEP("post: tegra-drm");
MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
MODULE_AUTHOR("Terje Bergstrom <tbergstrom@nvidia.com>");
MODULE_DESCRIPTION("Host1x driver for Tegra products");