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sys/dev/drm/core/drm_blend.c
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/* | |||||
* Copyright (C) 2016 Samsung Electronics Co.Ltd | |||||
* Authors: | |||||
* Marek Szyprowski <m.szyprowski@samsung.com> | |||||
* | |||||
* DRM core plane blending related functions | |||||
* | |||||
* Permission to use, copy, modify, distribute, and sell this software and its | |||||
* documentation for any purpose is hereby granted without fee, provided that | |||||
* the above copyright notice appear in all copies and that both that copyright | |||||
* notice and this permission notice appear in supporting documentation, and | |||||
* that the name of the copyright holders not be used in advertising or | |||||
* publicity pertaining to distribution of the software without specific, | |||||
* written prior permission. The copyright holders make no representations | |||||
* about the suitability of this software for any purpose. It is provided "as | |||||
* is" without express or implied warranty. | |||||
* | |||||
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |||||
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |||||
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |||||
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |||||
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |||||
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |||||
* OF THIS SOFTWARE. | |||||
*/ | |||||
#include <linux/export.h> | |||||
#include <linux/slab.h> | |||||
#include <linux/sort.h> | |||||
#include <drm/drm_atomic.h> | |||||
#include <drm/drm_blend.h> | |||||
#include <drm/drm_device.h> | |||||
#include <drm/drm_print.h> | |||||
#include "drm_crtc_internal.h" | |||||
/** | |||||
* DOC: overview | |||||
* | |||||
* The basic plane composition model supported by standard plane properties only | |||||
* has a source rectangle (in logical pixels within the &drm_framebuffer), with | |||||
* sub-pixel accuracy, which is scaled up to a pixel-aligned destination | |||||
* rectangle in the visible area of a &drm_crtc. The visible area of a CRTC is | |||||
* defined by the horizontal and vertical visible pixels (stored in @hdisplay | |||||
* and @vdisplay) of the requested mode (stored in &drm_crtc_state.mode). These | |||||
* two rectangles are both stored in the &drm_plane_state. | |||||
* | |||||
* For the atomic ioctl the following standard (atomic) properties on the plane object | |||||
* encode the basic plane composition model: | |||||
* | |||||
* SRC_X: | |||||
* X coordinate offset for the source rectangle within the | |||||
* &drm_framebuffer, in 16.16 fixed point. Must be positive. | |||||
* SRC_Y: | |||||
* Y coordinate offset for the source rectangle within the | |||||
* &drm_framebuffer, in 16.16 fixed point. Must be positive. | |||||
* SRC_W: | |||||
* Width for the source rectangle within the &drm_framebuffer, in 16.16 | |||||
* fixed point. SRC_X plus SRC_W must be within the width of the source | |||||
* framebuffer. Must be positive. | |||||
* SRC_H: | |||||
* Height for the source rectangle within the &drm_framebuffer, in 16.16 | |||||
* fixed point. SRC_Y plus SRC_H must be within the height of the source | |||||
* framebuffer. Must be positive. | |||||
* CRTC_X: | |||||
* X coordinate offset for the destination rectangle. Can be negative. | |||||
* CRTC_Y: | |||||
* Y coordinate offset for the destination rectangle. Can be negative. | |||||
* CRTC_W: | |||||
* Width for the destination rectangle. CRTC_X plus CRTC_W can extend past | |||||
* the currently visible horizontal area of the &drm_crtc. | |||||
* CRTC_H: | |||||
* Height for the destination rectangle. CRTC_Y plus CRTC_H can extend past | |||||
* the currently visible vertical area of the &drm_crtc. | |||||
* FB_ID: | |||||
* Mode object ID of the &drm_framebuffer this plane should scan out. | |||||
* CRTC_ID: | |||||
* Mode object ID of the &drm_crtc this plane should be connected to. | |||||
* | |||||
* Note that the source rectangle must fully lie within the bounds of the | |||||
* &drm_framebuffer. The destination rectangle can lie outside of the visible | |||||
* area of the current mode of the CRTC. It must be apprpriately clipped by the | |||||
* driver, which can be done by calling drm_plane_helper_check_update(). Drivers | |||||
* are also allowed to round the subpixel sampling positions appropriately, but | |||||
* only to the next full pixel. No pixel outside of the source rectangle may | |||||
* ever be sampled, which is important when applying more sophisticated | |||||
* filtering than just a bilinear one when scaling. The filtering mode when | |||||
* scaling is unspecified. | |||||
* | |||||
* On top of this basic transformation additional properties can be exposed by | |||||
* the driver: | |||||
* | |||||
* alpha: | |||||
* Alpha is setup with drm_plane_create_alpha_property(). It controls the | |||||
* plane-wide opacity, from transparent (0) to opaque (0xffff). It can be | |||||
* combined with pixel alpha. | |||||
* The pixel values in the framebuffers are expected to not be | |||||
* pre-multiplied by the global alpha associated to the plane. | |||||
* | |||||
* rotation: | |||||
* Rotation is set up with drm_plane_create_rotation_property(). It adds a | |||||
* rotation and reflection step between the source and destination rectangles. | |||||
* Without this property the rectangle is only scaled, but not rotated or | |||||
* reflected. | |||||
* | |||||
* Possbile values: | |||||
* | |||||
* "rotate-<degrees>": | |||||
* Signals that a drm plane is rotated <degrees> degrees in counter | |||||
* clockwise direction. | |||||
* | |||||
* "reflect-<axis>": | |||||
* Signals that the contents of a drm plane is reflected along the | |||||
* <axis> axis, in the same way as mirroring. | |||||
* | |||||
* reflect-x:: | |||||
* | |||||
* |o | | o| | |||||
* | | -> | | | |||||
* | v| |v | | |||||
* | |||||
* reflect-y:: | |||||
* | |||||
* |o | | ^| | |||||
* | | -> | | | |||||
* | v| |o | | |||||
* | |||||
* zpos: | |||||
* Z position is set up with drm_plane_create_zpos_immutable_property() and | |||||
* drm_plane_create_zpos_property(). It controls the visibility of overlapping | |||||
* planes. Without this property the primary plane is always below the cursor | |||||
* plane, and ordering between all other planes is undefined. | |||||
* | |||||
* pixel blend mode: | |||||
* Pixel blend mode is set up with drm_plane_create_blend_mode_property(). | |||||
* It adds a blend mode for alpha blending equation selection, describing | |||||
* how the pixels from the current plane are composited with the | |||||
* background. | |||||
* | |||||
* Three alpha blending equations are defined: | |||||
* | |||||
* "None": | |||||
* Blend formula that ignores the pixel alpha:: | |||||
* | |||||
* out.rgb = plane_alpha * fg.rgb + | |||||
* (1 - plane_alpha) * bg.rgb | |||||
* | |||||
* "Pre-multiplied": | |||||
* Blend formula that assumes the pixel color values | |||||
* have been already pre-multiplied with the alpha | |||||
* channel values:: | |||||
* | |||||
* out.rgb = plane_alpha * fg.rgb + | |||||
* (1 - (plane_alpha * fg.alpha)) * bg.rgb | |||||
* | |||||
* "Coverage": | |||||
* Blend formula that assumes the pixel color values have not | |||||
* been pre-multiplied and will do so when blending them to the | |||||
* background color values:: | |||||
* | |||||
* out.rgb = plane_alpha * fg.alpha * fg.rgb + | |||||
* (1 - (plane_alpha * fg.alpha)) * bg.rgb | |||||
* | |||||
* Using the following symbols: | |||||
* | |||||
* "fg.rgb": | |||||
* Each of the RGB component values from the plane's pixel | |||||
* "fg.alpha": | |||||
* Alpha component value from the plane's pixel. If the plane's | |||||
* pixel format has no alpha component, then this is assumed to be | |||||
* 1.0. In these cases, this property has no effect, as all three | |||||
* equations become equivalent. | |||||
* "bg.rgb": | |||||
* Each of the RGB component values from the background | |||||
* "plane_alpha": | |||||
* Plane alpha value set by the plane "alpha" property. If the | |||||
* plane does not expose the "alpha" property, then this is | |||||
* assumed to be 1.0 | |||||
* | |||||
* Note that all the property extensions described here apply either to the | |||||
* plane or the CRTC (e.g. for the background color, which currently is not | |||||
* exposed and assumed to be black). | |||||
*/ | |||||
/** | |||||
* drm_plane_create_alpha_property - create a new alpha property | |||||
* @plane: drm plane | |||||
* | |||||
* This function creates a generic, mutable, alpha property and enables support | |||||
* for it in the DRM core. It is attached to @plane. | |||||
* | |||||
* The alpha property will be allowed to be within the bounds of 0 | |||||
* (transparent) to 0xffff (opaque). | |||||
* | |||||
* Returns: | |||||
* 0 on success, negative error code on failure. | |||||
*/ | |||||
int drm_plane_create_alpha_property(struct drm_plane *plane) | |||||
{ | |||||
struct drm_property *prop; | |||||
prop = drm_property_create_range(plane->dev, 0, "alpha", | |||||
0, DRM_BLEND_ALPHA_OPAQUE); | |||||
if (!prop) | |||||
return -ENOMEM; | |||||
drm_object_attach_property(&plane->base, prop, DRM_BLEND_ALPHA_OPAQUE); | |||||
plane->alpha_property = prop; | |||||
if (plane->state) | |||||
plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE; | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_plane_create_alpha_property); | |||||
/** | |||||
* drm_plane_create_rotation_property - create a new rotation property | |||||
* @plane: drm plane | |||||
* @rotation: initial value of the rotation property | |||||
* @supported_rotations: bitmask of supported rotations and reflections | |||||
* | |||||
* This creates a new property with the selected support for transformations. | |||||
* | |||||
* Since a rotation by 180° degress is the same as reflecting both along the x | |||||
* and the y axis the rotation property is somewhat redundant. Drivers can use | |||||
* drm_rotation_simplify() to normalize values of this property. | |||||
* | |||||
* The property exposed to userspace is a bitmask property (see | |||||
* drm_property_create_bitmask()) called "rotation" and has the following | |||||
* bitmask enumaration values: | |||||
* | |||||
* DRM_MODE_ROTATE_0: | |||||
* "rotate-0" | |||||
* DRM_MODE_ROTATE_90: | |||||
* "rotate-90" | |||||
* DRM_MODE_ROTATE_180: | |||||
* "rotate-180" | |||||
* DRM_MODE_ROTATE_270: | |||||
* "rotate-270" | |||||
* DRM_MODE_REFLECT_X: | |||||
* "reflect-x" | |||||
* DRM_MODE_REFLECT_Y: | |||||
* "reflect-y" | |||||
* | |||||
* Rotation is the specified amount in degrees in counter clockwise direction, | |||||
* the X and Y axis are within the source rectangle, i.e. the X/Y axis before | |||||
* rotation. After reflection, the rotation is applied to the image sampled from | |||||
* the source rectangle, before scaling it to fit the destination rectangle. | |||||
*/ | |||||
int drm_plane_create_rotation_property(struct drm_plane *plane, | |||||
unsigned int rotation, | |||||
unsigned int supported_rotations) | |||||
{ | |||||
static const struct drm_prop_enum_list props[] = { | |||||
{ __builtin_ffs(DRM_MODE_ROTATE_0) - 1, "rotate-0" }, | |||||
{ __builtin_ffs(DRM_MODE_ROTATE_90) - 1, "rotate-90" }, | |||||
{ __builtin_ffs(DRM_MODE_ROTATE_180) - 1, "rotate-180" }, | |||||
{ __builtin_ffs(DRM_MODE_ROTATE_270) - 1, "rotate-270" }, | |||||
{ __builtin_ffs(DRM_MODE_REFLECT_X) - 1, "reflect-x" }, | |||||
{ __builtin_ffs(DRM_MODE_REFLECT_Y) - 1, "reflect-y" }, | |||||
}; | |||||
struct drm_property *prop; | |||||
WARN_ON((supported_rotations & DRM_MODE_ROTATE_MASK) == 0); | |||||
WARN_ON(!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK)); | |||||
WARN_ON(rotation & ~supported_rotations); | |||||
prop = drm_property_create_bitmask(plane->dev, 0, "rotation", | |||||
props, ARRAY_SIZE(props), | |||||
supported_rotations); | |||||
if (!prop) | |||||
return -ENOMEM; | |||||
drm_object_attach_property(&plane->base, prop, rotation); | |||||
if (plane->state) | |||||
plane->state->rotation = rotation; | |||||
plane->rotation_property = prop; | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_plane_create_rotation_property); | |||||
/** | |||||
* drm_rotation_simplify() - Try to simplify the rotation | |||||
* @rotation: Rotation to be simplified | |||||
* @supported_rotations: Supported rotations | |||||
* | |||||
* Attempt to simplify the rotation to a form that is supported. | |||||
* Eg. if the hardware supports everything except DRM_MODE_REFLECT_X | |||||
* one could call this function like this: | |||||
* | |||||
* drm_rotation_simplify(rotation, DRM_MODE_ROTATE_0 | | |||||
* DRM_MODE_ROTATE_90 | DRM_MODE_ROTATE_180 | | |||||
* DRM_MODE_ROTATE_270 | DRM_MODE_REFLECT_Y); | |||||
* | |||||
* to eliminate the DRM_MODE_ROTATE_X flag. Depending on what kind of | |||||
* transforms the hardware supports, this function may not | |||||
* be able to produce a supported transform, so the caller should | |||||
* check the result afterwards. | |||||
*/ | |||||
unsigned int drm_rotation_simplify(unsigned int rotation, | |||||
unsigned int supported_rotations) | |||||
{ | |||||
if (rotation & ~supported_rotations) { | |||||
rotation ^= DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y; | |||||
rotation = (rotation & DRM_MODE_REFLECT_MASK) | | |||||
BIT((ffs(rotation & DRM_MODE_ROTATE_MASK) + 1) | |||||
% 4); | |||||
} | |||||
return rotation; | |||||
} | |||||
EXPORT_SYMBOL(drm_rotation_simplify); | |||||
/** | |||||
* drm_plane_create_zpos_property - create mutable zpos property | |||||
* @plane: drm plane | |||||
* @zpos: initial value of zpos property | |||||
* @min: minimal possible value of zpos property | |||||
* @max: maximal possible value of zpos property | |||||
* | |||||
* This function initializes generic mutable zpos property and enables support | |||||
* for it in drm core. Drivers can then attach this property to planes to enable | |||||
* support for configurable planes arrangement during blending operation. | |||||
* Drivers that attach a mutable zpos property to any plane should call the | |||||
* drm_atomic_normalize_zpos() helper during their implementation of | |||||
* &drm_mode_config_funcs.atomic_check(), which will update the normalized zpos | |||||
* values and store them in &drm_plane_state.normalized_zpos. Usually min | |||||
* should be set to 0 and max to maximal number of planes for given crtc - 1. | |||||
* | |||||
* If zpos of some planes cannot be changed (like fixed background or | |||||
* cursor/topmost planes), driver should adjust min/max values and assign those | |||||
* planes immutable zpos property with lower or higher values (for more | |||||
* information, see drm_plane_create_zpos_immutable_property() function). In such | |||||
* case driver should also assign proper initial zpos values for all planes in | |||||
* its plane_reset() callback, so the planes will be always sorted properly. | |||||
* | |||||
* See also drm_atomic_normalize_zpos(). | |||||
* | |||||
* The property exposed to userspace is called "zpos". | |||||
* | |||||
* Returns: | |||||
* Zero on success, negative errno on failure. | |||||
*/ | |||||
int drm_plane_create_zpos_property(struct drm_plane *plane, | |||||
unsigned int zpos, | |||||
unsigned int min, unsigned int max) | |||||
{ | |||||
struct drm_property *prop; | |||||
prop = drm_property_create_range(plane->dev, 0, "zpos", min, max); | |||||
if (!prop) | |||||
return -ENOMEM; | |||||
drm_object_attach_property(&plane->base, prop, zpos); | |||||
plane->zpos_property = prop; | |||||
if (plane->state) { | |||||
plane->state->zpos = zpos; | |||||
plane->state->normalized_zpos = zpos; | |||||
} | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_plane_create_zpos_property); | |||||
/** | |||||
* drm_plane_create_zpos_immutable_property - create immuttable zpos property | |||||
* @plane: drm plane | |||||
* @zpos: value of zpos property | |||||
* | |||||
* This function initializes generic immutable zpos property and enables | |||||
* support for it in drm core. Using this property driver lets userspace | |||||
* to get the arrangement of the planes for blending operation and notifies | |||||
* it that the hardware (or driver) doesn't support changing of the planes' | |||||
* order. For mutable zpos see drm_plane_create_zpos_property(). | |||||
* | |||||
* The property exposed to userspace is called "zpos". | |||||
* | |||||
* Returns: | |||||
* Zero on success, negative errno on failure. | |||||
*/ | |||||
int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, | |||||
unsigned int zpos) | |||||
{ | |||||
struct drm_property *prop; | |||||
prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE, | |||||
"zpos", zpos, zpos); | |||||
if (!prop) | |||||
return -ENOMEM; | |||||
drm_object_attach_property(&plane->base, prop, zpos); | |||||
plane->zpos_property = prop; | |||||
if (plane->state) { | |||||
plane->state->zpos = zpos; | |||||
plane->state->normalized_zpos = zpos; | |||||
} | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property); | |||||
static int drm_atomic_state_zpos_cmp(const void *a, const void *b) | |||||
{ | |||||
const struct drm_plane_state *sa = *(struct drm_plane_state **)a; | |||||
const struct drm_plane_state *sb = *(struct drm_plane_state **)b; | |||||
if (sa->zpos != sb->zpos) | |||||
return sa->zpos - sb->zpos; | |||||
else | |||||
return sa->plane->base.id - sb->plane->base.id; | |||||
} | |||||
static int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc, | |||||
struct drm_crtc_state *crtc_state) | |||||
{ | |||||
struct drm_atomic_state *state = crtc_state->state; | |||||
struct drm_device *dev = crtc->dev; | |||||
int total_planes = dev->mode_config.num_total_plane; | |||||
struct drm_plane_state **states; | |||||
struct drm_plane *plane; | |||||
int i, n = 0; | |||||
int ret = 0; | |||||
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] calculating normalized zpos values\n", | |||||
crtc->base.id, crtc->name); | |||||
states = kmalloc_array(total_planes, sizeof(*states), GFP_KERNEL); | |||||
if (!states) | |||||
return -ENOMEM; | |||||
/* | |||||
* Normalization process might create new states for planes which | |||||
* normalized_zpos has to be recalculated. | |||||
*/ | |||||
drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { | |||||
struct drm_plane_state *plane_state = | |||||
drm_atomic_get_plane_state(state, plane); | |||||
if (IS_ERR(plane_state)) { | |||||
ret = PTR_ERR(plane_state); | |||||
goto done; | |||||
} | |||||
states[n++] = plane_state; | |||||
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] processing zpos value %d\n", | |||||
plane->base.id, plane->name, | |||||
plane_state->zpos); | |||||
} | |||||
sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL); | |||||
for (i = 0; i < n; i++) { | |||||
plane = states[i]->plane; | |||||
states[i]->normalized_zpos = i; | |||||
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] normalized zpos value %d\n", | |||||
plane->base.id, plane->name, i); | |||||
} | |||||
crtc_state->zpos_changed = true; | |||||
done: | |||||
kfree(states); | |||||
return ret; | |||||
} | |||||
/** | |||||
* drm_atomic_normalize_zpos - calculate normalized zpos values for all crtcs | |||||
* @dev: DRM device | |||||
* @state: atomic state of DRM device | |||||
* | |||||
* This function calculates normalized zpos value for all modified planes in | |||||
* the provided atomic state of DRM device. | |||||
* | |||||
* For every CRTC this function checks new states of all planes assigned to | |||||
* it and calculates normalized zpos value for these planes. Planes are compared | |||||
* first by their zpos values, then by plane id (if zpos is equal). The plane | |||||
* with lowest zpos value is at the bottom. The &drm_plane_state.normalized_zpos | |||||
* is then filled with unique values from 0 to number of active planes in crtc | |||||
* minus one. | |||||
* | |||||
* RETURNS | |||||
* Zero for success or -errno | |||||
*/ | |||||
int drm_atomic_normalize_zpos(struct drm_device *dev, | |||||
struct drm_atomic_state *state) | |||||
{ | |||||
struct drm_crtc *crtc; | |||||
struct drm_crtc_state *old_crtc_state, *new_crtc_state; | |||||
struct drm_plane *plane; | |||||
struct drm_plane_state *old_plane_state, *new_plane_state; | |||||
int i, ret = 0; | |||||
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { | |||||
crtc = new_plane_state->crtc; | |||||
if (!crtc) | |||||
continue; | |||||
if (old_plane_state->zpos != new_plane_state->zpos) { | |||||
new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); | |||||
new_crtc_state->zpos_changed = true; | |||||
} | |||||
} | |||||
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { | |||||
if (old_crtc_state->plane_mask != new_crtc_state->plane_mask || | |||||
new_crtc_state->zpos_changed) { | |||||
ret = drm_atomic_helper_crtc_normalize_zpos(crtc, | |||||
new_crtc_state); | |||||
if (ret) | |||||
return ret; | |||||
} | |||||
} | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_atomic_normalize_zpos); | |||||
/** | |||||
* drm_plane_create_blend_mode_property - create a new blend mode property | |||||
* @plane: drm plane | |||||
* @supported_modes: bitmask of supported modes, must include | |||||
* BIT(DRM_MODE_BLEND_PREMULTI). Current DRM assumption is | |||||
* that alpha is premultiplied, and old userspace can break if | |||||
* the property defaults to anything else. | |||||
* | |||||
* This creates a new property describing the blend mode. | |||||
* | |||||
* The property exposed to userspace is an enumeration property (see | |||||
* drm_property_create_enum()) called "pixel blend mode" and has the | |||||
* following enumeration values: | |||||
* | |||||
* "None": | |||||
* Blend formula that ignores the pixel alpha. | |||||
* | |||||
* "Pre-multiplied": | |||||
* Blend formula that assumes the pixel color values have been already | |||||
* pre-multiplied with the alpha channel values. | |||||
* | |||||
* "Coverage": | |||||
* Blend formula that assumes the pixel color values have not been | |||||
* pre-multiplied and will do so when blending them to the background color | |||||
* values. | |||||
* | |||||
* RETURNS: | |||||
* Zero for success or -errno | |||||
*/ | |||||
int drm_plane_create_blend_mode_property(struct drm_plane *plane, | |||||
unsigned int supported_modes) | |||||
{ | |||||
struct drm_device *dev = plane->dev; | |||||
struct drm_property *prop; | |||||
static const struct drm_prop_enum_list props[] = { | |||||
{ DRM_MODE_BLEND_PIXEL_NONE, "None" }, | |||||
{ DRM_MODE_BLEND_PREMULTI, "Pre-multiplied" }, | |||||
{ DRM_MODE_BLEND_COVERAGE, "Coverage" }, | |||||
}; | |||||
unsigned int valid_mode_mask = BIT(DRM_MODE_BLEND_PIXEL_NONE) | | |||||
BIT(DRM_MODE_BLEND_PREMULTI) | | |||||
BIT(DRM_MODE_BLEND_COVERAGE); | |||||
int i; | |||||
if (WARN_ON((supported_modes & ~valid_mode_mask) || | |||||
((supported_modes & BIT(DRM_MODE_BLEND_PREMULTI)) == 0))) | |||||
return -EINVAL; | |||||
prop = drm_property_create(dev, DRM_MODE_PROP_ENUM, | |||||
"pixel blend mode", | |||||
hweight32(supported_modes)); | |||||
if (!prop) | |||||
return -ENOMEM; | |||||
for (i = 0; i < ARRAY_SIZE(props); i++) { | |||||
int ret; | |||||
if (!(BIT(props[i].type) & supported_modes)) | |||||
continue; | |||||
ret = drm_property_add_enum(prop, props[i].type, | |||||
props[i].name); | |||||
if (ret) { | |||||
drm_property_destroy(dev, prop); | |||||
return ret; | |||||
} | |||||
} | |||||
drm_object_attach_property(&plane->base, prop, DRM_MODE_BLEND_PREMULTI); | |||||
plane->blend_mode_property = prop; | |||||
return 0; | |||||
} | |||||
EXPORT_SYMBOL(drm_plane_create_blend_mode_property); |