[PATCH v4 03/11] drm: Add drm_mode_create_rotation_property() (original) (raw)
sagar.a.kamble at intel.com sagar.a.kamble at intel.com
Fri Feb 7 05:45:08 PST 2014
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From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Add a function to create a standards compliant rotation property.
v4: For creating rotation bitmask property send number of values as only number of set rotations
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com> Signed-off-by: Sagar Kamble <sagar.a.kamble at intel.com> Tested-by: Sagar Kamble <sagar.a.kamble at intel.com>
drivers/gpu/drm/drm_crtc.c | 33 +++++++++++++++++++++++++++++++++ include/drm/drm_crtc.h | 2 ++ 2 files changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 628d3d3..e7bbbad 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -4118,3 +4118,36 @@ void drm_mode_config_cleanup(struct drm_device dev) idr_destroy(&dev->mode_config.crtc_idr); } EXPORT_SYMBOL(drm_mode_config_cleanup); + +/ +* Function to get number of bits set in bitmask +* using Brian Kernighan's Algorithm +*/ +unsigned int bits_set(unsigned int n) +{ + unsigned int count = 0; + + while (n) { + n &= (n-1); + count ++; + } + return count; +} + +struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev, + unsigned int supported_rotations) +{ + static const struct drm_prop_enum_list props[] = { + { DRM_ROTATE_0, "rotate-0" }, + { DRM_ROTATE_90, "rotate-90" }, + { DRM_ROTATE_180, "rotate-180" }, + { DRM_ROTATE_270, "rotate-270" }, + { DRM_REFLECT_X, "reflect-x" }, + { DRM_REFLECT_Y, "reflect-y" }, + }; + + return drm_property_create_bitmask(dev, 0, "rotation", + props, bits_set(supported_rotations), + supported_rotations); +} +EXPORT_SYMBOL(drm_mode_create_rotation_property); diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 41b86d2..4b3ac70 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1183,6 +1183,8 @@ extern int drm_format_plane_cpp(uint32_t format, int plane); extern int drm_format_horz_chroma_subsampling(uint32_t format); extern int drm_format_vert_chroma_subsampling(uint32_t format); extern const char *drm_get_format_name(uint32_t format); +extern struct drm_property *drm_mode_create_rotation_property(struct drm_device dev, + unsigned int supported_rotations); / Helpers */ static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev,
1.8.5
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