diff options
| author | Vamsee Vardhan Thummala <vthummala@nvidia.com> | 2025-07-08 21:18:08 +0900 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2025-09-11 18:56:38 +0200 |
| commit | fab823d82ee50c7953bd67d152e35e0bddaeee86 (patch) | |
| tree | 7a7805d70bf3190acfc0bef77399e311fabda641 /drivers/gpu/host1x | |
| parent | 63d47cc6eeb27fa0f5b2d9e2e9b950d728b6ca24 (diff) | |
gpu: host1x: Allow loading tegra-drm without enabled engines
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
Diffstat (limited to 'drivers/gpu/host1x')
| -rw-r--r-- | drivers/gpu/host1x/bus.c | 12 | ||||
| -rw-r--r-- | drivers/gpu/host1x/dev.c | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c index 344cc9e741c1..723a80895cd4 100644 --- a/drivers/gpu/host1x/bus.c +++ b/drivers/gpu/host1x/bus.c @@ -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; } diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c index 1f93e5e276c0..e1a9246d35f4 100644 --- a/drivers/gpu/host1x/dev.c +++ b/drivers/gpu/host1x/dev.c @@ -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"); |