2 * Copyright (C) 2014 Intel Corporation
4 * DRM universal plane helper functions
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26 #include <linux/list.h>
28 #include <drm/drm_plane_helper.h>
29 #include <drm/drm_rect.h>
30 #include <drm/drm_atomic.h>
31 #include <drm/drm_crtc_helper.h>
32 #include <drm/drm_atomic_helper.h>
34 #define SUBPIXEL_MASK 0xffff
39 * This helper library has two parts. The first part has support to implement
40 * primary plane support on top of the normal CRTC configuration interface.
41 * Since the legacy ->set_config interface ties the primary plane together with
42 * the CRTC state this does not allow userspace to disable the primary plane
43 * itself. To avoid too much duplicated code use
44 * drm_plane_helper_check_update() which can be used to enforce the same
45 * restrictions as primary planes had thus. The default primary plane only
46 * expose XRBG8888 and ARGB8888 as valid pixel formats for the attached
49 * Drivers are highly recommended to implement proper support for primary
50 * planes, and newly merged drivers must not rely upon these transitional
53 * The second part also implements transitional helpers which allow drivers to
54 * gradually switch to the atomic helper infrastructure for plane updates. Once
55 * that switch is complete drivers shouldn't use these any longer, instead using
56 * the proper legacy implementations for update and disable plane hooks provided
57 * by the atomic helpers.
59 * Again drivers are strongly urged to switch to the new interfaces.
61 * The plane helpers share the function table structures with other helpers,
62 * specifically also the atomic helpers. See struct &drm_plane_helper_funcs for
67 * This is the minimal list of formats that seem to be safe for modeset use
68 * with all current DRM drivers. Most hardware can actually support more
69 * formats than this and drivers may specify a more accurate list when
70 * creating the primary plane. However drivers that still call
71 * drm_plane_init() will use this minimal format list as the default.
73 static const uint32_t safe_modeset_formats[] = {
79 * Returns the connectors currently associated with a CRTC. This function
80 * should be called twice: once with a NULL connector list to retrieve
81 * the list size, and once with the properly allocated list to be filled in.
83 static int get_connectors_for_crtc(struct drm_crtc *crtc,
84 struct drm_connector **connector_list,
87 struct drm_device *dev = crtc->dev;
88 struct drm_connector *connector;
92 * Note: Once we change the plane hooks to more fine-grained locking we
93 * need to grab the connection_mutex here to be able to make these
96 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
98 drm_for_each_connector(connector, dev) {
99 if (connector->encoder && connector->encoder->crtc == crtc) {
100 if (connector_list != NULL && count < num_connectors)
101 *(connector_list++) = connector;
111 * drm_plane_helper_check_update() - Check plane update for validity
112 * @plane: plane object to update
113 * @crtc: owning CRTC of owning plane
114 * @fb: framebuffer to flip onto plane
115 * @src: source coordinates in 16.16 fixed point
116 * @dest: integer destination coordinates
117 * @clip: integer clipping coordinates
118 * @rotation: plane rotation
119 * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
120 * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
121 * @can_position: is it legal to position the plane such that it
122 * doesn't cover the entire crtc? This will generally
123 * only be false for primary planes.
124 * @can_update_disabled: can the plane be updated while the crtc
126 * @visible: output parameter indicating whether plane is still visible after
129 * Checks that a desired plane update is valid. Drivers that provide
130 * their own plane handling rather than helper-provided implementations may
131 * still wish to call this function to avoid duplication of error checking
135 * Zero if update appears valid, error code on failure
137 int drm_plane_helper_check_update(struct drm_plane *plane,
138 struct drm_crtc *crtc,
139 struct drm_framebuffer *fb,
140 struct drm_rect *src,
141 struct drm_rect *dest,
142 const struct drm_rect *clip,
143 unsigned int rotation,
147 bool can_update_disabled,
157 /* crtc should only be NULL when disabling (i.e., !fb) */
158 if (WARN_ON(!crtc)) {
163 if (!crtc->enabled && !can_update_disabled) {
164 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
168 drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
171 hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale);
172 vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale);
173 if (hscale < 0 || vscale < 0) {
174 DRM_DEBUG_KMS("Invalid scaling of plane\n");
175 drm_rect_debug_print("src: ", src, true);
176 drm_rect_debug_print("dst: ", dest, false);
180 *visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
182 drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
186 * Plane isn't visible; some drivers can handle this
187 * so we just return success here. Drivers that can't
188 * (including those that use the primary plane helper's
189 * update function) will return an error from their
190 * update_plane handler.
194 if (!can_position && !drm_rect_equals(dest, clip)) {
195 DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
196 drm_rect_debug_print("dst: ", dest, false);
197 drm_rect_debug_print("clip: ", clip, false);
203 EXPORT_SYMBOL(drm_plane_helper_check_update);
206 * drm_primary_helper_update() - Helper for primary plane update
207 * @plane: plane object to update
208 * @crtc: owning CRTC of owning plane
209 * @fb: framebuffer to flip onto plane
210 * @crtc_x: x offset of primary plane on crtc
211 * @crtc_y: y offset of primary plane on crtc
212 * @crtc_w: width of primary plane rectangle on crtc
213 * @crtc_h: height of primary plane rectangle on crtc
214 * @src_x: x offset of @fb for panning
215 * @src_y: y offset of @fb for panning
216 * @src_w: width of source rectangle in @fb
217 * @src_h: height of source rectangle in @fb
219 * Provides a default plane update handler for primary planes. This is handler
220 * is called in response to a userspace SetPlane operation on the plane with a
221 * non-NULL framebuffer. We call the driver's modeset handler to update the
224 * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
227 * Note that we make some assumptions about hardware limitations that may not be
228 * true for all hardware --
230 * 1. Primary plane cannot be repositioned.
231 * 2. Primary plane cannot be scaled.
232 * 3. Primary plane must cover the entire CRTC.
233 * 4. Subpixel positioning is not supported.
235 * Drivers for hardware that don't have these restrictions can provide their
236 * own implementation rather than using this helper.
239 * Zero on success, error code on failure
241 int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
242 struct drm_framebuffer *fb,
243 int crtc_x, int crtc_y,
244 unsigned int crtc_w, unsigned int crtc_h,
245 uint32_t src_x, uint32_t src_y,
246 uint32_t src_w, uint32_t src_h)
248 struct drm_mode_set set = {
255 struct drm_rect src = {
261 struct drm_rect dest = {
264 .x2 = crtc_x + crtc_w,
265 .y2 = crtc_y + crtc_h,
267 const struct drm_rect clip = {
268 .x2 = crtc->mode.hdisplay,
269 .y2 = crtc->mode.vdisplay,
271 struct drm_connector **connector_list;
272 int num_connectors, ret;
275 ret = drm_plane_helper_check_update(plane, crtc, fb,
278 DRM_PLANE_HELPER_NO_SCALING,
279 DRM_PLANE_HELPER_NO_SCALING,
280 false, false, &visible);
286 * Primary plane isn't visible. Note that unless a driver
287 * provides their own disable function, this will just
288 * wind up returning -EINVAL to userspace.
290 return plane->funcs->disable_plane(plane);
292 /* Find current connectors for CRTC */
293 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
294 BUG_ON(num_connectors == 0);
295 connector_list = kzalloc(num_connectors * sizeof(*connector_list),
299 get_connectors_for_crtc(crtc, connector_list, num_connectors);
301 set.connectors = connector_list;
302 set.num_connectors = num_connectors;
305 * We call set_config() directly here rather than using
306 * drm_mode_set_config_internal. We're reprogramming the same
307 * connectors that were already in use, so we shouldn't need the extra
308 * cross-CRTC fb refcounting to accomodate stealing connectors.
309 * drm_mode_setplane() already handles the basic refcounting for the
310 * framebuffers involved in this operation.
312 ret = crtc->funcs->set_config(&set);
314 kfree(connector_list);
317 EXPORT_SYMBOL(drm_primary_helper_update);
320 * drm_primary_helper_disable() - Helper for primary plane disable
321 * @plane: plane to disable
323 * Provides a default plane disable handler for primary planes. This is handler
324 * is called in response to a userspace SetPlane operation on the plane with a
325 * NULL framebuffer parameter. It unconditionally fails the disable call with
326 * -EINVAL the only way to disable the primary plane without driver support is
327 * to disable the entier CRTC. Which does not match the plane ->disable hook.
329 * Note that some hardware may be able to disable the primary plane without
330 * disabling the whole CRTC. Drivers for such hardware should provide their
331 * own disable handler that disables just the primary plane (and they'll likely
332 * need to provide their own update handler as well to properly re-enable a
333 * disabled primary plane).
336 * Unconditionally returns -EINVAL.
338 int drm_primary_helper_disable(struct drm_plane *plane)
342 EXPORT_SYMBOL(drm_primary_helper_disable);
345 * drm_primary_helper_destroy() - Helper for primary plane destruction
346 * @plane: plane to destroy
348 * Provides a default plane destroy handler for primary planes. This handler
349 * is called during CRTC destruction. We disable the primary plane, remove
350 * it from the DRM plane list, and deallocate the plane structure.
352 void drm_primary_helper_destroy(struct drm_plane *plane)
354 drm_plane_cleanup(plane);
357 EXPORT_SYMBOL(drm_primary_helper_destroy);
359 const struct drm_plane_funcs drm_primary_helper_funcs = {
360 .update_plane = drm_primary_helper_update,
361 .disable_plane = drm_primary_helper_disable,
362 .destroy = drm_primary_helper_destroy,
364 EXPORT_SYMBOL(drm_primary_helper_funcs);
366 static struct drm_plane *create_primary_plane(struct drm_device *dev)
368 struct drm_plane *primary;
371 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
372 if (primary == NULL) {
373 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
378 * Remove the format_default field from drm_plane when dropping
381 primary->format_default = true;
383 /* possible_crtc's will be filled in later by crtc_init */
384 ret = drm_universal_plane_init(dev, primary, 0,
385 &drm_primary_helper_funcs,
386 safe_modeset_formats,
387 ARRAY_SIZE(safe_modeset_formats),
388 DRM_PLANE_TYPE_PRIMARY, NULL);
398 * drm_crtc_init - Legacy CRTC initialization function
400 * @crtc: CRTC object to init
401 * @funcs: callbacks for the new CRTC
403 * Initialize a CRTC object with a default helper-provided primary plane and no
407 * Zero on success, error code on failure.
409 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
410 const struct drm_crtc_funcs *funcs)
412 struct drm_plane *primary;
414 primary = create_primary_plane(dev);
415 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs,
418 EXPORT_SYMBOL(drm_crtc_init);
420 int drm_plane_helper_commit(struct drm_plane *plane,
421 struct drm_plane_state *plane_state,
422 struct drm_framebuffer *old_fb)
424 const struct drm_plane_helper_funcs *plane_funcs;
425 struct drm_crtc *crtc[2];
426 const struct drm_crtc_helper_funcs *crtc_funcs[2];
429 plane_funcs = plane->helper_private;
431 /* Since this is a transitional helper we can't assume that plane->state
432 * is always valid. Hence we need to use plane->crtc instead of
433 * plane->state->crtc as the old crtc. */
434 crtc[0] = plane->crtc;
435 crtc[1] = crtc[0] != plane_state->crtc ? plane_state->crtc : NULL;
437 for (i = 0; i < 2; i++)
438 crtc_funcs[i] = crtc[i] ? crtc[i]->helper_private : NULL;
440 if (plane_funcs->atomic_check) {
441 ret = plane_funcs->atomic_check(plane, plane_state);
446 if (plane_funcs->prepare_fb && plane_state->fb &&
447 plane_state->fb != old_fb) {
448 ret = plane_funcs->prepare_fb(plane,
454 /* Point of no return, commit sw state. */
455 swap(plane->state, plane_state);
457 for (i = 0; i < 2; i++) {
458 if (crtc_funcs[i] && crtc_funcs[i]->atomic_begin)
459 crtc_funcs[i]->atomic_begin(crtc[i], crtc[i]->state);
463 * Drivers may optionally implement the ->atomic_disable callback, so
464 * special-case that here.
466 if (drm_atomic_plane_disabling(plane, plane_state) &&
467 plane_funcs->atomic_disable)
468 plane_funcs->atomic_disable(plane, plane_state);
470 plane_funcs->atomic_update(plane, plane_state);
472 for (i = 0; i < 2; i++) {
473 if (crtc_funcs[i] && crtc_funcs[i]->atomic_flush)
474 crtc_funcs[i]->atomic_flush(crtc[i], crtc[i]->state);
478 * If we only moved the plane and didn't change fb's, there's no need to
481 if (plane->state->fb == old_fb)
484 for (i = 0; i < 2; i++) {
488 if (crtc[i]->cursor == plane)
491 /* There's no other way to figure out whether the crtc is running. */
492 ret = drm_crtc_vblank_get(crtc[i]);
494 drm_crtc_wait_one_vblank(crtc[i]);
495 drm_crtc_vblank_put(crtc[i]);
501 if (plane_funcs->cleanup_fb)
502 plane_funcs->cleanup_fb(plane, plane_state);
505 if (plane->funcs->atomic_destroy_state)
506 plane->funcs->atomic_destroy_state(plane, plane_state);
508 drm_atomic_helper_plane_destroy_state(plane, plane_state);
515 * drm_plane_helper_update() - Transitional helper for plane update
516 * @plane: plane object to update
517 * @crtc: owning CRTC of owning plane
518 * @fb: framebuffer to flip onto plane
519 * @crtc_x: x offset of primary plane on crtc
520 * @crtc_y: y offset of primary plane on crtc
521 * @crtc_w: width of primary plane rectangle on crtc
522 * @crtc_h: height of primary plane rectangle on crtc
523 * @src_x: x offset of @fb for panning
524 * @src_y: y offset of @fb for panning
525 * @src_w: width of source rectangle in @fb
526 * @src_h: height of source rectangle in @fb
528 * Provides a default plane update handler using the atomic plane update
529 * functions. It is fully left to the driver to check plane constraints and
530 * handle corner-cases like a fully occluded or otherwise invisible plane.
532 * This is useful for piecewise transitioning of a driver to the atomic helpers.
535 * Zero on success, error code on failure
537 int drm_plane_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
538 struct drm_framebuffer *fb,
539 int crtc_x, int crtc_y,
540 unsigned int crtc_w, unsigned int crtc_h,
541 uint32_t src_x, uint32_t src_y,
542 uint32_t src_w, uint32_t src_h)
544 struct drm_plane_state *plane_state;
546 if (plane->funcs->atomic_duplicate_state)
547 plane_state = plane->funcs->atomic_duplicate_state(plane);
550 drm_atomic_helper_plane_reset(plane);
552 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
556 plane_state->plane = plane;
558 plane_state->crtc = crtc;
559 drm_atomic_set_fb_for_plane(plane_state, fb);
560 plane_state->crtc_x = crtc_x;
561 plane_state->crtc_y = crtc_y;
562 plane_state->crtc_h = crtc_h;
563 plane_state->crtc_w = crtc_w;
564 plane_state->src_x = src_x;
565 plane_state->src_y = src_y;
566 plane_state->src_h = src_h;
567 plane_state->src_w = src_w;
569 return drm_plane_helper_commit(plane, plane_state, plane->fb);
571 EXPORT_SYMBOL(drm_plane_helper_update);
574 * drm_plane_helper_disable() - Transitional helper for plane disable
575 * @plane: plane to disable
577 * Provides a default plane disable handler using the atomic plane update
578 * functions. It is fully left to the driver to check plane constraints and
579 * handle corner-cases like a fully occluded or otherwise invisible plane.
581 * This is useful for piecewise transitioning of a driver to the atomic helpers.
584 * Zero on success, error code on failure
586 int drm_plane_helper_disable(struct drm_plane *plane)
588 struct drm_plane_state *plane_state;
590 /* crtc helpers love to call disable functions for already disabled hw
591 * functions. So cope with that. */
595 if (plane->funcs->atomic_duplicate_state)
596 plane_state = plane->funcs->atomic_duplicate_state(plane);
599 drm_atomic_helper_plane_reset(plane);
601 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
605 plane_state->plane = plane;
607 plane_state->crtc = NULL;
608 drm_atomic_set_fb_for_plane(plane_state, NULL);
610 return drm_plane_helper_commit(plane, plane_state, plane->fb);
612 EXPORT_SYMBOL(drm_plane_helper_disable);