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drm: add drm_core_check_all_features() to check for a mask of features

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Add new drm_core_check_all_features() function to check for a mask of
features. All features in the mask are required.

Redefine existing drm_core_check_feature() in terms of this function,
using the drm_driver_feature enum for the parameter.

v3:
- add drm_core_check_all_features() (Thomas)

v2:
- fix kernel-doc (Ville)
- add an extra variable for clarity (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123124801.14958-1-jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2020-01-23 14:48:00 +02:00
parent c6cccafa91
commit 12a1d4e093
1 changed files with 22 additions and 2 deletions
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24
include/drm/drm_drv.h
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@ -823,6 +823,25 @@ static inline bool drm_dev_is_unplugged(struct drm_device *dev)
return true;
}
/**
* drm_core_check_all_features - check driver feature flags mask
* @dev: DRM device to check
* @features: feature flag(s) mask
*
* This checks @dev for driver features, see &drm_driver.driver_features,
* &drm_device.driver_features, and the various &enum drm_driver_feature flags.
*
* Returns true if all features in the @features mask are supported, false
* otherwise.
*/
static inline bool drm_core_check_all_features(const struct drm_device *dev,
u32 features)
{
u32 supported = dev->driver->driver_features & dev->driver_features;
return features && (supported & features) == features;
}
/**
* drm_core_check_feature - check driver feature flags
* @dev: DRM device to check
@ -833,9 +852,10 @@ static inline bool drm_dev_is_unplugged(struct drm_device *dev)
*
* Returns true if the @feature is supported, false otherwise.
*/
static inline bool drm_core_check_feature(const struct drm_device *dev, u32 feature)
static inline bool drm_core_check_feature(const struct drm_device *dev,
enum drm_driver_feature feature)
{
return dev->driver->driver_features & dev->driver_features & feature;
return drm_core_check_all_features(dev, feature);
}
/**