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Subject[RESEND PATCH 4/5] drm: Add a drm_drv_enabled() helper function
Date
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@suse.de>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

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
--
2.33.1
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