On Wed, 03 Nov 2021, Javier Martinez Canillas <javierm@xxxxxxxxxx> wrote:
> DRM drivers can use this to determine whether they can be enabled or not.
>
> For now it's just a wrapper around drm_modeset_disabled() but having the
> indirection level will allow to add other conditions besides "nomodeset".
>
> Suggested-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
Can't see i915 trivially using this due to the drm_driver
parameter. Please let's not merge helpers like this without actual
users.
BR,
Jani.
> ---
>
> drivers/gpu/drm/drm_drv.c | 21 +++++++++++++++++++++
> include/drm/drm_drv.h | 1 +
> 2 files changed, 22 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 8214a0b1ab7f..70ef08941e06 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -975,6 +975,27 @@ int drm_dev_set_unique(struct drm_device *dev, const char *name)
> }
> EXPORT_SYMBOL(drm_dev_set_unique);
>
> +/**
> + * drm_drv_enabled - Checks if a DRM driver can be enabled
> + * @driver: DRM driver to check
> + *
> + * Checks whether a DRM driver can be enabled or not. This may be the case
> + * if the "nomodeset" kernel command line parameter is used.
> + *
> + * Returns:
> + * True if the DRM driver is enabled and false otherwise.
> + */
> +bool drm_drv_enabled(const struct drm_driver *driver)
> +{
> + if (drm_modeset_disabled()) {
> + DRM_INFO("%s driver is disabled\n", driver->name);
> + return false;
> + }
> +
> + return true;
> +}
> +EXPORT_SYMBOL(drm_drv_enabled);
> +
> /*
> * DRM Core
> * The DRM core module initializes all global DRM objects and makes them
> diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
> index 0cd95953cdf5..48f2b6eec012 100644
> --- a/include/drm/drm_drv.h
> +++ b/include/drm/drm_drv.h
> @@ -598,5 +598,6 @@ static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
>
> int drm_dev_set_unique(struct drm_device *dev, const char *name);
>
> +bool drm_drv_enabled(const struct drm_driver *driver);
>
> #endif
--
Jani Nikula, Intel Open Source Graphics Center
