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drm/object: Add drm_object_property_get_default_value() function 

Some functions to create properties (drm_plane_create_zpos_property or
drm_plane_create_color_properties for example) will ask for a range of
acceptable value and an initial one.

This initial value is then stored in the values array for that property.

Let's provide an helper to access this property.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220221095918.18763-7-maxime@cerno.tech
This commit is contained in:
Dave Stevenson 2022-02-21 10:59:02 +01:00 committed by Maxime Ripard
parent f6e63222c0
commit adf47b7529
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GPG Key ID: E3EF0D6F671851C5
2 changed files with 50 additions and 10 deletions
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53
drivers/gpu/drm/drm_mode_object.c
View File

@ -297,11 +297,26 @@ int drm_object_property_set_value(struct drm_mode_object *obj,
}
EXPORT_SYMBOL(drm_object_property_set_value);
static int __drm_object_property_get_prop_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t *val)
{
int i;
for (i = 0; i < obj->properties->count; i++) {
if (obj->properties->properties[i] == property) {
*val = obj->properties->values[i];
return 0;
}
}
return -EINVAL;
}
static int __drm_object_property_get_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t *val)
{
int i;
/* read-only properties bypass atomic mechanism and still store
* their value in obj->properties->values[].. mostly to avoid
@ -311,15 +326,7 @@ static int __drm_object_property_get_value(struct drm_mode_object *obj,
!(property->flags & DRM_MODE_PROP_IMMUTABLE))
return drm_atomic_get_property(obj, property, val);
for (i = 0; i < obj->properties->count; i++) {
if (obj->properties->properties[i] == property) {
*val = obj->properties->values[i];
return 0;
}
}
return -EINVAL;
return __drm_object_property_get_prop_value(obj, property, val);
}
/**
@ -348,6 +355,32 @@ int drm_object_property_get_value(struct drm_mode_object *obj,
}
EXPORT_SYMBOL(drm_object_property_get_value);
/**
* drm_object_property_get_default_value - retrieve the default value of a
* property when in atomic mode.
* @obj: drm mode object to get property value from
* @property: property to retrieve
* @val: storage for the property value
*
* This function retrieves the default state of the given property as passed in
* to drm_object_attach_property
*
* Only atomic drivers should call this function directly, as for non-atomic
* drivers it will return the current value.
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_object_property_get_default_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t *val)
{
WARN_ON(!drm_drv_uses_atomic_modeset(property->dev));
return __drm_object_property_get_prop_value(obj, property, val);
}
EXPORT_SYMBOL(drm_object_property_get_default_value);
/* helper for getconnector and getproperties ioctls */
int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
uint32_t __user *prop_ptr,

7
include/drm/drm_mode_object.h
View File

@ -98,6 +98,10 @@ struct drm_object_properties {
* Hence atomic drivers should not use drm_object_property_set_value()
* and drm_object_property_get_value() on mutable objects, i.e. those
* without the DRM_MODE_PROP_IMMUTABLE flag set.
*
* For atomic drivers the default value of properties is stored in this
* array, so drm_object_property_get_default_value can be used to
* retrieve it.
*/
uint64_t values[DRM_OBJECT_MAX_PROPERTY];
};
@ -126,6 +130,9 @@ int drm_object_property_set_value(struct drm_mode_object *obj,
int drm_object_property_get_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t *value);
int drm_object_property_get_default_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t *val);
void drm_object_attach_property(struct drm_mode_object *obj,
struct drm_property *property,