1 /* 2 * Copyright (C) 2016 Samsung Electronics Co.Ltd 3 * Authors: 4 * Marek Szyprowski <m.szyprowski@samsung.com> 5 * 6 * DRM core plane blending related functions 7 * 8 * Permission to use, copy, modify, distribute, and sell this software and its 9 * documentation for any purpose is hereby granted without fee, provided that 10 * the above copyright notice appear in all copies and that both that copyright 11 * notice and this permission notice appear in supporting documentation, and 12 * that the name of the copyright holders not be used in advertising or 13 * publicity pertaining to distribution of the software without specific, 14 * written prior permission. The copyright holders make no representations 15 * about the suitability of this software for any purpose. It is provided "as 16 * is" without express or implied warranty. 17 * 18 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 20 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 21 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 22 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 23 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 */ 26 27 #include <linux/export.h> 28 #include <linux/slab.h> 29 #include <linux/sort.h> 30 31 #include <drm/drm_atomic.h> 32 #include <drm/drm_blend.h> 33 #include <drm/drm_device.h> 34 #include <drm/drm_print.h> 35 36 #include "drm_crtc_internal.h" 37 38 /** 39 * DOC: overview 40 * 41 * The basic plane composition model supported by standard plane properties only 42 * has a source rectangle (in logical pixels within the &drm_framebuffer), with 43 * sub-pixel accuracy, which is scaled up to a pixel-aligned destination 44 * rectangle in the visible area of a &drm_crtc. The visible area of a CRTC is 45 * defined by the horizontal and vertical visible pixels (stored in @hdisplay 46 * and @vdisplay) of the requested mode (stored in &drm_crtc_state.mode). These 47 * two rectangles are both stored in the &drm_plane_state. 48 * 49 * For the atomic ioctl the following standard (atomic) properties on the plane object 50 * encode the basic plane composition model: 51 * 52 * SRC_X: 53 * X coordinate offset for the source rectangle within the 54 * &drm_framebuffer, in 16.16 fixed point. Must be positive. 55 * SRC_Y: 56 * Y coordinate offset for the source rectangle within the 57 * &drm_framebuffer, in 16.16 fixed point. Must be positive. 58 * SRC_W: 59 * Width for the source rectangle within the &drm_framebuffer, in 16.16 60 * fixed point. SRC_X plus SRC_W must be within the width of the source 61 * framebuffer. Must be positive. 62 * SRC_H: 63 * Height for the source rectangle within the &drm_framebuffer, in 16.16 64 * fixed point. SRC_Y plus SRC_H must be within the height of the source 65 * framebuffer. Must be positive. 66 * CRTC_X: 67 * X coordinate offset for the destination rectangle. Can be negative. 68 * CRTC_Y: 69 * Y coordinate offset for the destination rectangle. Can be negative. 70 * CRTC_W: 71 * Width for the destination rectangle. CRTC_X plus CRTC_W can extend past 72 * the currently visible horizontal area of the &drm_crtc. 73 * CRTC_H: 74 * Height for the destination rectangle. CRTC_Y plus CRTC_H can extend past 75 * the currently visible vertical area of the &drm_crtc. 76 * FB_ID: 77 * Mode object ID of the &drm_framebuffer this plane should scan out. 78 * 79 * When a KMS client is performing front-buffer rendering, it should set 80 * FB_ID to the same front-buffer FB on each atomic commit. This implies 81 * to the driver that it needs to re-read the same FB again. Otherwise 82 * drivers which do not employ continuously repeated scanout cycles might 83 * not update the screen. 84 * CRTC_ID: 85 * Mode object ID of the &drm_crtc this plane should be connected to. 86 * 87 * Note that the source rectangle must fully lie within the bounds of the 88 * &drm_framebuffer. The destination rectangle can lie outside of the visible 89 * area of the current mode of the CRTC. It must be appropriately clipped by the 90 * driver, which can be done by calling drm_plane_helper_check_update(). Drivers 91 * are also allowed to round the subpixel sampling positions appropriately, but 92 * only to the next full pixel. No pixel outside of the source rectangle may 93 * ever be sampled, which is important when applying more sophisticated 94 * filtering than just a bilinear one when scaling. The filtering mode when 95 * scaling is unspecified. 96 * 97 * On top of this basic transformation additional properties can be exposed by 98 * the driver: 99 * 100 * alpha: 101 * Alpha is setup with drm_plane_create_alpha_property(). It controls the 102 * plane-wide opacity, from transparent (0) to opaque (0xffff). It can be 103 * combined with pixel alpha. 104 * The pixel values in the framebuffers are expected to not be 105 * pre-multiplied by the global alpha associated to the plane. 106 * 107 * rotation: 108 * Rotation is set up with drm_plane_create_rotation_property(). It adds a 109 * rotation and reflection step between the source and destination rectangles. 110 * Without this property the rectangle is only scaled, but not rotated or 111 * reflected. 112 * 113 * Possbile values: 114 * 115 * "rotate-<degrees>": 116 * Signals that a drm plane is rotated <degrees> degrees in counter 117 * clockwise direction. 118 * 119 * "reflect-<axis>": 120 * Signals that the contents of a drm plane is reflected along the 121 * <axis> axis, in the same way as mirroring. 122 * 123 * reflect-x:: 124 * 125 * |o | | o| 126 * | | -> | | 127 * | v| |v | 128 * 129 * reflect-y:: 130 * 131 * |o | | ^| 132 * | | -> | | 133 * | v| |o | 134 * 135 * zpos: 136 * Z position is set up with drm_plane_create_zpos_immutable_property() and 137 * drm_plane_create_zpos_property(). It controls the visibility of overlapping 138 * planes. Without this property the primary plane is always below the cursor 139 * plane, and ordering between all other planes is undefined. The positive 140 * Z axis points towards the user, i.e. planes with lower Z position values 141 * are underneath planes with higher Z position values. Two planes with the 142 * same Z position value have undefined ordering. Note that the Z position 143 * value can also be immutable, to inform userspace about the hard-coded 144 * stacking of planes, see drm_plane_create_zpos_immutable_property(). If 145 * any plane has a zpos property (either mutable or immutable), then all 146 * planes shall have a zpos property. 147 * 148 * pixel blend mode: 149 * Pixel blend mode is set up with drm_plane_create_blend_mode_property(). 150 * It adds a blend mode for alpha blending equation selection, describing 151 * how the pixels from the current plane are composited with the 152 * background. 153 * 154 * Three alpha blending equations are defined: 155 * 156 * "None": 157 * Blend formula that ignores the pixel alpha:: 158 * 159 * out.rgb = plane_alpha * fg.rgb + 160 * (1 - plane_alpha) * bg.rgb 161 * 162 * "Pre-multiplied": 163 * Blend formula that assumes the pixel color values 164 * have been already pre-multiplied with the alpha 165 * channel values:: 166 * 167 * out.rgb = plane_alpha * fg.rgb + 168 * (1 - (plane_alpha * fg.alpha)) * bg.rgb 169 * 170 * "Coverage": 171 * Blend formula that assumes the pixel color values have not 172 * been pre-multiplied and will do so when blending them to the 173 * background color values:: 174 * 175 * out.rgb = plane_alpha * fg.alpha * fg.rgb + 176 * (1 - (plane_alpha * fg.alpha)) * bg.rgb 177 * 178 * Using the following symbols: 179 * 180 * "fg.rgb": 181 * Each of the RGB component values from the plane's pixel 182 * "fg.alpha": 183 * Alpha component value from the plane's pixel. If the plane's 184 * pixel format has no alpha component, then this is assumed to be 185 * 1.0. In these cases, this property has no effect, as all three 186 * equations become equivalent. 187 * "bg.rgb": 188 * Each of the RGB component values from the background 189 * "plane_alpha": 190 * Plane alpha value set by the plane "alpha" property. If the 191 * plane does not expose the "alpha" property, then this is 192 * assumed to be 1.0 193 * 194 * SCALING_FILTER: 195 * Indicates scaling filter to be used for plane scaler 196 * 197 * The value of this property can be one of the following: 198 * 199 * Default: 200 * Driver's default scaling filter 201 * Nearest Neighbor: 202 * Nearest Neighbor scaling filter 203 * 204 * Drivers can set up this property for a plane by calling 205 * drm_plane_create_scaling_filter_property 206 * 207 * The property extensions described above all apply to the plane. Drivers 208 * may also expose the following crtc property extension: 209 * 210 * BACKGROUND_COLOR: 211 * Background color is set up with drm_crtc_attach_background_color_property(), 212 * and expects a 64-bit ARGB value following DRM_FORMAT_ARGB16161616, as 213 * generated by the DRM_ARGB64_PREP*() helpers. It controls the color of a 214 * full-screen layer that exists below all planes. This color will be used 215 * for pixels not covered by any plane and may also be blended with plane 216 * contents as allowed by a plane's alpha values. 217 * The background color defaults to black, and is assumed to be black for 218 * drivers that do not expose this property. Although background color 219 * isn't a plane, it is assumed that the color provided here undergoes the 220 * CRTC degamma/CSC/gamma transformations applied after the planes blending. 221 * Note that the color value includes an alpha channel, hence non-opaque 222 * background color values are allowed, but since physically transparent 223 * monitors do not (yet) exists, the final alpha value may not reach the 224 * video sink or it may simply ignore it. 225 */ 226 227 /** 228 * drm_plane_create_alpha_property - create a new alpha property 229 * @plane: drm plane 230 * 231 * This function creates a generic, mutable, alpha property and enables support 232 * for it in the DRM core. It is attached to @plane. 233 * 234 * The alpha property will be allowed to be within the bounds of 0 235 * (transparent) to 0xffff (opaque). 236 * 237 * Returns: 238 * 0 on success, negative error code on failure. 239 */ 240 int drm_plane_create_alpha_property(struct drm_plane *plane) 241 { 242 struct drm_property *prop; 243 244 prop = drm_property_create_range(plane->dev, 0, "alpha", 245 0, DRM_BLEND_ALPHA_OPAQUE); 246 if (!prop) 247 return -ENOMEM; 248 249 drm_object_attach_property(&plane->base, prop, DRM_BLEND_ALPHA_OPAQUE); 250 plane->alpha_property = prop; 251 252 if (plane->state) 253 plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE; 254 255 return 0; 256 } 257 EXPORT_SYMBOL(drm_plane_create_alpha_property); 258 259 /** 260 * drm_plane_create_rotation_property - create a new rotation property 261 * @plane: drm plane 262 * @rotation: initial value of the rotation property 263 * @supported_rotations: bitmask of supported rotations and reflections 264 * 265 * This creates a new property with the selected support for transformations. 266 * 267 * Since a rotation by 180° degress is the same as reflecting both along the x 268 * and the y axis the rotation property is somewhat redundant. Drivers can use 269 * drm_rotation_simplify() to normalize values of this property. 270 * 271 * The property exposed to userspace is a bitmask property (see 272 * drm_property_create_bitmask()) called "rotation" and has the following 273 * bitmask enumaration values: 274 * 275 * DRM_MODE_ROTATE_0: 276 * "rotate-0" 277 * DRM_MODE_ROTATE_90: 278 * "rotate-90" 279 * DRM_MODE_ROTATE_180: 280 * "rotate-180" 281 * DRM_MODE_ROTATE_270: 282 * "rotate-270" 283 * DRM_MODE_REFLECT_X: 284 * "reflect-x" 285 * DRM_MODE_REFLECT_Y: 286 * "reflect-y" 287 * 288 * Rotation is the specified amount in degrees in counter clockwise direction, 289 * the X and Y axis are within the source rectangle, i.e. the X/Y axis before 290 * rotation. After reflection, the rotation is applied to the image sampled from 291 * the source rectangle, before scaling it to fit the destination rectangle. 292 */ 293 int drm_plane_create_rotation_property(struct drm_plane *plane, 294 unsigned int rotation, 295 unsigned int supported_rotations) 296 { 297 static const struct drm_prop_enum_list props[] = { 298 { __builtin_ffs(DRM_MODE_ROTATE_0) - 1, "rotate-0" }, 299 { __builtin_ffs(DRM_MODE_ROTATE_90) - 1, "rotate-90" }, 300 { __builtin_ffs(DRM_MODE_ROTATE_180) - 1, "rotate-180" }, 301 { __builtin_ffs(DRM_MODE_ROTATE_270) - 1, "rotate-270" }, 302 { __builtin_ffs(DRM_MODE_REFLECT_X) - 1, "reflect-x" }, 303 { __builtin_ffs(DRM_MODE_REFLECT_Y) - 1, "reflect-y" }, 304 }; 305 struct drm_property *prop; 306 307 WARN_ON((supported_rotations & DRM_MODE_ROTATE_MASK) == 0); 308 WARN_ON(!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK)); 309 WARN_ON(rotation & ~supported_rotations); 310 311 prop = drm_property_create_bitmask(plane->dev, 0, "rotation", 312 props, ARRAY_SIZE(props), 313 supported_rotations); 314 if (!prop) 315 return -ENOMEM; 316 317 drm_object_attach_property(&plane->base, prop, rotation); 318 319 if (plane->state) 320 plane->state->rotation = rotation; 321 322 plane->rotation_property = prop; 323 324 return 0; 325 } 326 EXPORT_SYMBOL(drm_plane_create_rotation_property); 327 328 /** 329 * drm_rotation_simplify() - Try to simplify the rotation 330 * @rotation: Rotation to be simplified 331 * @supported_rotations: Supported rotations 332 * 333 * Attempt to simplify the rotation to a form that is supported. 334 * Eg. if the hardware supports everything except DRM_MODE_REFLECT_X 335 * one could call this function like this: 336 * 337 * drm_rotation_simplify(rotation, DRM_MODE_ROTATE_0 | 338 * DRM_MODE_ROTATE_90 | DRM_MODE_ROTATE_180 | 339 * DRM_MODE_ROTATE_270 | DRM_MODE_REFLECT_Y); 340 * 341 * to eliminate the DRM_MODE_REFLECT_X flag. Depending on what kind of 342 * transforms the hardware supports, this function may not 343 * be able to produce a supported transform, so the caller should 344 * check the result afterwards. 345 */ 346 unsigned int drm_rotation_simplify(unsigned int rotation, 347 unsigned int supported_rotations) 348 { 349 if (rotation & ~supported_rotations) { 350 rotation ^= DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y; 351 rotation = (rotation & DRM_MODE_REFLECT_MASK) | 352 BIT((ffs(rotation & DRM_MODE_ROTATE_MASK) + 1) 353 % 4); 354 } 355 356 return rotation; 357 } 358 EXPORT_SYMBOL(drm_rotation_simplify); 359 360 /** 361 * drm_plane_create_zpos_property - create mutable zpos property 362 * @plane: drm plane 363 * @zpos: initial value of zpos property 364 * @min: minimal possible value of zpos property 365 * @max: maximal possible value of zpos property 366 * 367 * This function initializes generic mutable zpos property and enables support 368 * for it in drm core. Drivers can then attach this property to planes to enable 369 * support for configurable planes arrangement during blending operation. 370 * Drivers that attach a mutable zpos property to any plane should call the 371 * drm_atomic_normalize_zpos() helper during their implementation of 372 * &drm_mode_config_funcs.atomic_check(), which will update the normalized zpos 373 * values and store them in &drm_plane_state.normalized_zpos. Usually min 374 * should be set to 0 and max to maximal number of planes for given crtc - 1. 375 * 376 * If zpos of some planes cannot be changed (like fixed background or 377 * cursor/topmost planes), drivers shall adjust the min/max values and assign 378 * those planes immutable zpos properties with lower or higher values (for more 379 * information, see drm_plane_create_zpos_immutable_property() function). In such 380 * case drivers shall also assign proper initial zpos values for all planes in 381 * its plane_reset() callback, so the planes will be always sorted properly. 382 * 383 * See also drm_atomic_normalize_zpos(). 384 * 385 * The property exposed to userspace is called "zpos". 386 * 387 * Returns: 388 * Zero on success, negative errno on failure. 389 */ 390 int drm_plane_create_zpos_property(struct drm_plane *plane, 391 unsigned int zpos, 392 unsigned int min, unsigned int max) 393 { 394 struct drm_property *prop; 395 396 prop = drm_property_create_range(plane->dev, 0, "zpos", min, max); 397 if (!prop) 398 return -ENOMEM; 399 400 drm_object_attach_property(&plane->base, prop, zpos); 401 402 plane->zpos_property = prop; 403 404 if (plane->state) { 405 plane->state->zpos = zpos; 406 plane->state->normalized_zpos = zpos; 407 } 408 409 return 0; 410 } 411 EXPORT_SYMBOL(drm_plane_create_zpos_property); 412 413 /** 414 * drm_plane_create_zpos_immutable_property - create immuttable zpos property 415 * @plane: drm plane 416 * @zpos: value of zpos property 417 * 418 * This function initializes generic immutable zpos property and enables 419 * support for it in drm core. Using this property driver lets userspace 420 * to get the arrangement of the planes for blending operation and notifies 421 * it that the hardware (or driver) doesn't support changing of the planes' 422 * order. For mutable zpos see drm_plane_create_zpos_property(). 423 * 424 * The property exposed to userspace is called "zpos". 425 * 426 * Returns: 427 * Zero on success, negative errno on failure. 428 */ 429 int drm_plane_create_zpos_immutable_property(struct drm_plane *plane, 430 unsigned int zpos) 431 { 432 struct drm_property *prop; 433 434 prop = drm_property_create_range(plane->dev, DRM_MODE_PROP_IMMUTABLE, 435 "zpos", zpos, zpos); 436 if (!prop) 437 return -ENOMEM; 438 439 drm_object_attach_property(&plane->base, prop, zpos); 440 441 plane->zpos_property = prop; 442 443 if (plane->state) { 444 plane->state->zpos = zpos; 445 plane->state->normalized_zpos = zpos; 446 } 447 448 return 0; 449 } 450 EXPORT_SYMBOL(drm_plane_create_zpos_immutable_property); 451 452 static int drm_atomic_state_zpos_cmp(const void *a, const void *b) 453 { 454 const struct drm_plane_state *sa = *(struct drm_plane_state **)a; 455 const struct drm_plane_state *sb = *(struct drm_plane_state **)b; 456 457 if (sa->zpos != sb->zpos) 458 return sa->zpos - sb->zpos; 459 else 460 return sa->plane->base.id - sb->plane->base.id; 461 } 462 463 static int drm_atomic_helper_crtc_normalize_zpos(struct drm_crtc *crtc, 464 struct drm_crtc_state *crtc_state) 465 { 466 struct drm_atomic_state *state = crtc_state->state; 467 struct drm_device *dev = crtc->dev; 468 int total_planes = dev->mode_config.num_total_plane; 469 struct drm_plane_state **states; 470 struct drm_plane *plane; 471 int i, n = 0; 472 int ret = 0; 473 474 drm_dbg_atomic(dev, "[CRTC:%d:%s] calculating normalized zpos values\n", 475 crtc->base.id, crtc->name); 476 477 states = kmalloc_objs(*states, total_planes); 478 if (!states) 479 return -ENOMEM; 480 481 /* 482 * Normalization process might create new states for planes which 483 * normalized_zpos has to be recalculated. 484 */ 485 drm_for_each_plane_mask(plane, dev, crtc_state->plane_mask) { 486 struct drm_plane_state *plane_state = 487 drm_atomic_get_plane_state(state, plane); 488 if (IS_ERR(plane_state)) { 489 ret = PTR_ERR(plane_state); 490 goto done; 491 } 492 states[n++] = plane_state; 493 drm_dbg_atomic(dev, "[PLANE:%d:%s] processing zpos value %d\n", 494 plane->base.id, plane->name, plane_state->zpos); 495 } 496 497 sort(states, n, sizeof(*states), drm_atomic_state_zpos_cmp, NULL); 498 499 for (i = 0; i < n; i++) { 500 plane = states[i]->plane; 501 502 states[i]->normalized_zpos = i; 503 drm_dbg_atomic(dev, "[PLANE:%d:%s] normalized zpos value %d\n", 504 plane->base.id, plane->name, i); 505 } 506 crtc_state->zpos_changed = true; 507 508 done: 509 kfree(states); 510 return ret; 511 } 512 513 /** 514 * drm_atomic_normalize_zpos - calculate normalized zpos values for all crtcs 515 * @dev: DRM device 516 * @state: atomic state of DRM device 517 * 518 * This function calculates normalized zpos value for all modified planes in 519 * the provided atomic state of DRM device. 520 * 521 * For every CRTC this function checks new states of all planes assigned to 522 * it and calculates normalized zpos value for these planes. Planes are compared 523 * first by their zpos values, then by plane id (if zpos is equal). The plane 524 * with lowest zpos value is at the bottom. The &drm_plane_state.normalized_zpos 525 * is then filled with unique values from 0 to number of active planes in crtc 526 * minus one. 527 * 528 * RETURNS 529 * Zero for success or -errno 530 */ 531 int drm_atomic_normalize_zpos(struct drm_device *dev, 532 struct drm_atomic_state *state) 533 { 534 struct drm_crtc *crtc; 535 struct drm_crtc_state *old_crtc_state, *new_crtc_state; 536 struct drm_plane *plane; 537 struct drm_plane_state *old_plane_state, *new_plane_state; 538 int i, ret = 0; 539 540 for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) { 541 crtc = new_plane_state->crtc; 542 if (!crtc) 543 continue; 544 if (old_plane_state->zpos != new_plane_state->zpos) { 545 new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 546 new_crtc_state->zpos_changed = true; 547 } 548 } 549 550 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { 551 if (old_crtc_state->plane_mask != new_crtc_state->plane_mask || 552 new_crtc_state->zpos_changed) { 553 ret = drm_atomic_helper_crtc_normalize_zpos(crtc, 554 new_crtc_state); 555 if (ret) 556 return ret; 557 } 558 } 559 return 0; 560 } 561 EXPORT_SYMBOL(drm_atomic_normalize_zpos); 562 563 /** 564 * drm_plane_create_blend_mode_property - create a new blend mode property 565 * @plane: drm plane 566 * @supported_modes: bitmask of supported modes, must include 567 * BIT(DRM_MODE_BLEND_PREMULTI). Current DRM assumption is 568 * that alpha is premultiplied, and old userspace can break if 569 * the property defaults to anything else. 570 * 571 * This creates a new property describing the blend mode. 572 * 573 * The property exposed to userspace is an enumeration property (see 574 * drm_property_create_enum()) called "pixel blend mode" and has the 575 * following enumeration values: 576 * 577 * "None": 578 * Blend formula that ignores the pixel alpha. 579 * 580 * "Pre-multiplied": 581 * Blend formula that assumes the pixel color values have been already 582 * pre-multiplied with the alpha channel values. 583 * 584 * "Coverage": 585 * Blend formula that assumes the pixel color values have not been 586 * pre-multiplied and will do so when blending them to the background color 587 * values. 588 * 589 * RETURNS: 590 * Zero for success or -errno 591 */ 592 int drm_plane_create_blend_mode_property(struct drm_plane *plane, 593 unsigned int supported_modes) 594 { 595 struct drm_device *dev = plane->dev; 596 struct drm_property *prop; 597 static const struct drm_prop_enum_list props[] = { 598 { DRM_MODE_BLEND_PIXEL_NONE, "None" }, 599 { DRM_MODE_BLEND_PREMULTI, "Pre-multiplied" }, 600 { DRM_MODE_BLEND_COVERAGE, "Coverage" }, 601 }; 602 unsigned int valid_mode_mask = BIT(DRM_MODE_BLEND_PIXEL_NONE) | 603 BIT(DRM_MODE_BLEND_PREMULTI) | 604 BIT(DRM_MODE_BLEND_COVERAGE); 605 int i; 606 607 if (WARN_ON((supported_modes & ~valid_mode_mask) || 608 ((supported_modes & BIT(DRM_MODE_BLEND_PREMULTI)) == 0))) 609 return -EINVAL; 610 611 prop = drm_property_create(dev, DRM_MODE_PROP_ENUM, 612 "pixel blend mode", 613 hweight32(supported_modes)); 614 if (!prop) 615 return -ENOMEM; 616 617 for (i = 0; i < ARRAY_SIZE(props); i++) { 618 int ret; 619 620 if (!(BIT(props[i].type) & supported_modes)) 621 continue; 622 623 ret = drm_property_add_enum(prop, props[i].type, 624 props[i].name); 625 626 if (ret) { 627 drm_property_destroy(dev, prop); 628 629 return ret; 630 } 631 } 632 633 drm_object_attach_property(&plane->base, prop, DRM_MODE_BLEND_PREMULTI); 634 plane->blend_mode_property = prop; 635 636 return 0; 637 } 638 EXPORT_SYMBOL(drm_plane_create_blend_mode_property); 639 640 /** 641 * drm_crtc_attach_background_color_property - attach background color property 642 * @crtc: drm crtc 643 * 644 * Attaches the background color property to @crtc. The property defaults to 645 * solid black and will accept 64-bit ARGB values in the format generated by 646 * DRM_ARGB64_PREP*() helpers. 647 */ 648 void drm_crtc_attach_background_color_property(struct drm_crtc *crtc) 649 { 650 drm_object_attach_property(&crtc->base, 651 crtc->dev->mode_config.background_color_property, 652 DRM_ARGB64_PREP(0xffff, 0, 0, 0)); 653 } 654 EXPORT_SYMBOL(drm_crtc_attach_background_color_property); 655