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.
63 * This is the minimal list of formats that seem to be safe for modeset use
64 * with all current DRM drivers. Most hardware can actually support more
65 * formats than this and drivers may specify a more accurate list when
66 * creating the primary plane. However drivers that still call
67 * drm_plane_init() will use this minimal format list as the default.
69 static const uint32_t safe_modeset_formats[] = {
75 * Returns the connectors currently associated with a CRTC. This function
76 * should be called twice: once with a NULL connector list to retrieve
77 * the list size, and once with the properly allocated list to be filled in.
79 static int get_connectors_for_crtc(struct drm_crtc *crtc,
80 struct drm_connector **connector_list,
83 struct drm_device *dev = crtc->dev;
84 struct drm_connector *connector;
88 * Note: Once we change the plane hooks to more fine-grained locking we
89 * need to grab the connection_mutex here to be able to make these
92 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
94 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
95 if (connector->encoder && connector->encoder->crtc == crtc) {
96 if (connector_list != NULL && count < num_connectors)
97 *(connector_list++) = connector;
106 * drm_plane_helper_check_update() - Check plane update for validity
107 * @plane: plane object to update
108 * @crtc: owning CRTC of owning plane
109 * @fb: framebuffer to flip onto plane
110 * @src: source coordinates in 16.16 fixed point
111 * @dest: integer destination coordinates
112 * @clip: integer clipping coordinates
113 * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
114 * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
115 * @can_position: is it legal to position the plane such that it
116 * doesn't cover the entire crtc? This will generally
117 * only be false for primary planes.
118 * @can_update_disabled: can the plane be updated while the crtc
120 * @visible: output parameter indicating whether plane is still visible after
123 * Checks that a desired plane update is valid. Drivers that provide
124 * their own plane handling rather than helper-provided implementations may
125 * still wish to call this function to avoid duplication of error checking
129 * Zero if update appears valid, error code on failure
131 int drm_plane_helper_check_update(struct drm_plane *plane,
132 struct drm_crtc *crtc,
133 struct drm_framebuffer *fb,
134 struct drm_rect *src,
135 struct drm_rect *dest,
136 const struct drm_rect *clip,
140 bool can_update_disabled,
145 if (!crtc->enabled && !can_update_disabled) {
146 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
151 hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale);
152 vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale);
153 if (hscale < 0 || vscale < 0) {
154 DRM_DEBUG_KMS("Invalid scaling of plane\n");
158 *visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
161 * Plane isn't visible; some drivers can handle this
162 * so we just return success here. Drivers that can't
163 * (including those that use the primary plane helper's
164 * update function) will return an error from their
165 * update_plane handler.
169 if (!can_position && !drm_rect_equals(dest, clip)) {
170 DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
176 EXPORT_SYMBOL(drm_plane_helper_check_update);
179 * drm_primary_helper_update() - Helper for primary plane update
180 * @plane: plane object to update
181 * @crtc: owning CRTC of owning plane
182 * @fb: framebuffer to flip onto plane
183 * @crtc_x: x offset of primary plane on crtc
184 * @crtc_y: y offset of primary plane on crtc
185 * @crtc_w: width of primary plane rectangle on crtc
186 * @crtc_h: height of primary plane rectangle on crtc
187 * @src_x: x offset of @fb for panning
188 * @src_y: y offset of @fb for panning
189 * @src_w: width of source rectangle in @fb
190 * @src_h: height of source rectangle in @fb
192 * Provides a default plane update handler for primary planes. This is handler
193 * is called in response to a userspace SetPlane operation on the plane with a
194 * non-NULL framebuffer. We call the driver's modeset handler to update the
197 * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
200 * Note that we make some assumptions about hardware limitations that may not be
201 * true for all hardware --
202 * 1) Primary plane cannot be repositioned.
203 * 2) Primary plane cannot be scaled.
204 * 3) Primary plane must cover the entire CRTC.
205 * 4) Subpixel positioning is not supported.
206 * Drivers for hardware that don't have these restrictions can provide their
207 * own implementation rather than using this helper.
210 * Zero on success, error code on failure
212 int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
213 struct drm_framebuffer *fb,
214 int crtc_x, int crtc_y,
215 unsigned int crtc_w, unsigned int crtc_h,
216 uint32_t src_x, uint32_t src_y,
217 uint32_t src_w, uint32_t src_h)
219 struct drm_mode_set set = {
226 struct drm_rect src = {
232 struct drm_rect dest = {
235 .x2 = crtc_x + crtc_w,
236 .y2 = crtc_y + crtc_h,
238 const struct drm_rect clip = {
239 .x2 = crtc->mode.hdisplay,
240 .y2 = crtc->mode.vdisplay,
242 struct drm_connector **connector_list;
243 int num_connectors, ret;
246 ret = drm_plane_helper_check_update(plane, crtc, fb,
248 DRM_PLANE_HELPER_NO_SCALING,
249 DRM_PLANE_HELPER_NO_SCALING,
250 false, false, &visible);
256 * Primary plane isn't visible. Note that unless a driver
257 * provides their own disable function, this will just
258 * wind up returning -EINVAL to userspace.
260 return plane->funcs->disable_plane(plane);
262 /* Find current connectors for CRTC */
263 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
264 BUG_ON(num_connectors == 0);
265 connector_list = kzalloc(num_connectors * sizeof(*connector_list),
269 get_connectors_for_crtc(crtc, connector_list, num_connectors);
271 set.connectors = connector_list;
272 set.num_connectors = num_connectors;
275 * We call set_config() directly here rather than using
276 * drm_mode_set_config_internal. We're reprogramming the same
277 * connectors that were already in use, so we shouldn't need the extra
278 * cross-CRTC fb refcounting to accomodate stealing connectors.
279 * drm_mode_setplane() already handles the basic refcounting for the
280 * framebuffers involved in this operation.
282 ret = crtc->funcs->set_config(&set);
284 kfree(connector_list);
287 EXPORT_SYMBOL(drm_primary_helper_update);
290 * drm_primary_helper_disable() - Helper for primary plane disable
291 * @plane: plane to disable
293 * Provides a default plane disable handler for primary planes. This is handler
294 * is called in response to a userspace SetPlane operation on the plane with a
295 * NULL framebuffer parameter. It unconditionally fails the disable call with
296 * -EINVAL the only way to disable the primary plane without driver support is
297 * to disable the entier CRTC. Which does not match the plane ->disable hook.
299 * Note that some hardware may be able to disable the primary plane without
300 * disabling the whole CRTC. Drivers for such hardware should provide their
301 * own disable handler that disables just the primary plane (and they'll likely
302 * need to provide their own update handler as well to properly re-enable a
303 * disabled primary plane).
306 * Unconditionally returns -EINVAL.
308 int drm_primary_helper_disable(struct drm_plane *plane)
312 EXPORT_SYMBOL(drm_primary_helper_disable);
315 * drm_primary_helper_destroy() - Helper for primary plane destruction
316 * @plane: plane to destroy
318 * Provides a default plane destroy handler for primary planes. This handler
319 * is called during CRTC destruction. We disable the primary plane, remove
320 * it from the DRM plane list, and deallocate the plane structure.
322 void drm_primary_helper_destroy(struct drm_plane *plane)
324 drm_plane_cleanup(plane);
327 EXPORT_SYMBOL(drm_primary_helper_destroy);
329 const struct drm_plane_funcs drm_primary_helper_funcs = {
330 .update_plane = drm_primary_helper_update,
331 .disable_plane = drm_primary_helper_disable,
332 .destroy = drm_primary_helper_destroy,
334 EXPORT_SYMBOL(drm_primary_helper_funcs);
337 * drm_primary_helper_create_plane() - Create a generic primary plane
339 * @formats: pixel formats supported, or NULL for a default safe list
340 * @num_formats: size of @formats; ignored if @formats is NULL
342 * Allocates and initializes a primary plane that can be used with the primary
343 * plane helpers. Drivers that wish to use driver-specific plane structures or
344 * provide custom handler functions may perform their own allocation and
345 * initialization rather than calling this function.
347 struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
348 const uint32_t *formats,
351 struct drm_plane *primary;
354 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
355 if (primary == NULL) {
356 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
360 if (formats == NULL) {
361 formats = safe_modeset_formats;
362 num_formats = ARRAY_SIZE(safe_modeset_formats);
365 /* possible_crtc's will be filled in later by crtc_init */
366 ret = drm_universal_plane_init(dev, primary, 0,
367 &drm_primary_helper_funcs,
368 formats, num_formats,
369 DRM_PLANE_TYPE_PRIMARY);
377 EXPORT_SYMBOL(drm_primary_helper_create_plane);
380 * drm_crtc_init - Legacy CRTC initialization function
382 * @crtc: CRTC object to init
383 * @funcs: callbacks for the new CRTC
385 * Initialize a CRTC object with a default helper-provided primary plane and no
389 * Zero on success, error code on failure.
391 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
392 const struct drm_crtc_funcs *funcs)
394 struct drm_plane *primary;
396 primary = drm_primary_helper_create_plane(dev, NULL, 0);
397 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);
399 EXPORT_SYMBOL(drm_crtc_init);
401 int drm_plane_helper_commit(struct drm_plane *plane,
402 struct drm_plane_state *plane_state,
403 struct drm_framebuffer *old_fb)
405 struct drm_plane_helper_funcs *plane_funcs;
406 struct drm_crtc *crtc[2];
407 struct drm_crtc_helper_funcs *crtc_funcs[2];
410 plane_funcs = plane->helper_private;
412 /* Since this is a transitional helper we can't assume that plane->state
413 * is always valid. Hence we need to use plane->crtc instead of
414 * plane->state->crtc as the old crtc. */
415 crtc[0] = plane->crtc;
416 crtc[1] = crtc[0] != plane_state->crtc ? plane_state->crtc : NULL;
418 for (i = 0; i < 2; i++)
419 crtc_funcs[i] = crtc[i] ? crtc[i]->helper_private : NULL;
421 if (plane_funcs->atomic_check) {
422 ret = plane_funcs->atomic_check(plane, plane_state);
427 if (plane_funcs->prepare_fb && plane_state->fb) {
428 ret = plane_funcs->prepare_fb(plane, plane_state->fb);
433 /* Point of no return, commit sw state. */
434 swap(plane->state, plane_state);
436 for (i = 0; i < 2; i++) {
437 if (crtc_funcs[i] && crtc_funcs[i]->atomic_begin)
438 crtc_funcs[i]->atomic_begin(crtc[i]);
441 plane_funcs->atomic_update(plane);
443 for (i = 0; i < 2; i++) {
444 if (crtc_funcs[i] && crtc_funcs[i]->atomic_flush)
445 crtc_funcs[i]->atomic_flush(crtc[i]);
448 for (i = 0; i < 2; i++) {
452 /* There's no other way to figure out whether the crtc is running. */
453 ret = drm_crtc_vblank_get(crtc[i]);
455 drm_crtc_wait_one_vblank(crtc[i]);
456 drm_crtc_vblank_put(crtc[i]);
462 if (plane_funcs->cleanup_fb && old_fb)
463 plane_funcs->cleanup_fb(plane, old_fb);
466 if (plane->funcs->atomic_destroy_state)
467 plane->funcs->atomic_destroy_state(plane, plane_state);
469 drm_atomic_helper_plane_destroy_state(plane, plane_state);
476 * drm_plane_helper_update() - Helper for primary plane update
477 * @plane: plane object to update
478 * @crtc: owning CRTC of owning plane
479 * @fb: framebuffer to flip onto plane
480 * @crtc_x: x offset of primary plane on crtc
481 * @crtc_y: y offset of primary plane on crtc
482 * @crtc_w: width of primary plane rectangle on crtc
483 * @crtc_h: height of primary plane rectangle on crtc
484 * @src_x: x offset of @fb for panning
485 * @src_y: y offset of @fb for panning
486 * @src_w: width of source rectangle in @fb
487 * @src_h: height of source rectangle in @fb
489 * Provides a default plane update handler using the atomic plane update
490 * functions. It is fully left to the driver to check plane constraints and
491 * handle corner-cases like a fully occluded or otherwise invisible plane.
493 * This is useful for piecewise transitioning of a driver to the atomic helpers.
496 * Zero on success, error code on failure
498 int drm_plane_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
499 struct drm_framebuffer *fb,
500 int crtc_x, int crtc_y,
501 unsigned int crtc_w, unsigned int crtc_h,
502 uint32_t src_x, uint32_t src_y,
503 uint32_t src_w, uint32_t src_h)
505 struct drm_plane_state *plane_state;
507 if (plane->funcs->atomic_duplicate_state)
508 plane_state = plane->funcs->atomic_duplicate_state(plane);
509 else if (plane->state)
510 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
512 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);
516 plane_state->crtc = crtc;
517 drm_atomic_set_fb_for_plane(plane_state, fb);
518 plane_state->crtc_x = crtc_x;
519 plane_state->crtc_y = crtc_y;
520 plane_state->crtc_h = crtc_h;
521 plane_state->crtc_w = crtc_w;
522 plane_state->src_x = src_x;
523 plane_state->src_y = src_y;
524 plane_state->src_h = src_h;
525 plane_state->src_w = src_w;
527 return drm_plane_helper_commit(plane, plane_state, plane->fb);
529 EXPORT_SYMBOL(drm_plane_helper_update);
532 * drm_plane_helper_disable() - Helper for primary plane disable
533 * @plane: plane to disable
535 * Provides a default plane disable handler using the atomic plane update
536 * functions. It is fully left to the driver to check plane constraints and
537 * handle corner-cases like a fully occluded or otherwise invisible plane.
539 * This is useful for piecewise transitioning of a driver to the atomic helpers.
542 * Zero on success, error code on failure
544 int drm_plane_helper_disable(struct drm_plane *plane)
546 struct drm_plane_state *plane_state;
548 /* crtc helpers love to call disable functions for already disabled hw
549 * functions. So cope with that. */
553 if (plane->funcs->atomic_duplicate_state)
554 plane_state = plane->funcs->atomic_duplicate_state(plane);
555 else if (plane->state)
556 plane_state = drm_atomic_helper_plane_duplicate_state(plane);
558 plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);
562 plane_state->crtc = NULL;
563 drm_atomic_set_fb_for_plane(plane_state, NULL);
565 return drm_plane_helper_commit(plane, plane_state, plane->fb);
567 EXPORT_SYMBOL(drm_plane_helper_disable);