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_atomic.h>
29 #include <drm/drm_atomic_helper.h>
30 #include <drm/drm_atomic_uapi.h>
31 #include <drm/drm_crtc_helper.h>
32 #include <drm/drm_device.h>
33 #include <drm/drm_drv.h>
34 #include <drm/drm_encoder.h>
35 #include <drm/drm_plane_helper.h>
36 #include <drm/drm_print.h>
37 #include <drm/drm_rect.h>
39 #define SUBPIXEL_MASK 0xffff
44 * This helper library has two parts. The first part has support to implement
45 * primary plane support on top of the normal CRTC configuration interface.
46 * Since the legacy &drm_mode_config_funcs.set_config interface ties the primary
47 * plane together with the CRTC state this does not allow userspace to disable
48 * the primary plane itself. The default primary plane only expose XRBG8888 and
49 * ARGB8888 as valid pixel formats for the attached framebuffer.
51 * Drivers are highly recommended to implement proper support for primary
52 * planes, and newly merged drivers must not rely upon these transitional
55 * The second part also implements transitional helpers which allow drivers to
56 * gradually switch to the atomic helper infrastructure for plane updates. Once
57 * that switch is complete drivers shouldn't use these any longer, instead using
58 * the proper legacy implementations for update and disable plane hooks provided
59 * by the atomic helpers.
61 * Again drivers are strongly urged to switch to the new interfaces.
63 * The plane helpers share the function table structures with other helpers,
64 * specifically also the atomic helpers. See &struct drm_plane_helper_funcs for
69 * Returns the connectors currently associated with a CRTC. This function
70 * should be called twice: once with a NULL connector list to retrieve
71 * the list size, and once with the properly allocated list to be filled in.
73 static int get_connectors_for_crtc(struct drm_crtc *crtc,
74 struct drm_connector **connector_list,
77 struct drm_device *dev = crtc->dev;
78 struct drm_connector *connector;
79 struct drm_connector_list_iter conn_iter;
83 * Note: Once we change the plane hooks to more fine-grained locking we
84 * need to grab the connection_mutex here to be able to make these
87 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
89 drm_connector_list_iter_begin(dev, &conn_iter);
90 drm_for_each_connector_iter(connector, &conn_iter) {
91 if (connector->encoder && connector->encoder->crtc == crtc) {
92 if (connector_list != NULL && count < num_connectors)
93 *(connector_list++) = connector;
98 drm_connector_list_iter_end(&conn_iter);
103 static int drm_plane_helper_check_update(struct drm_plane *plane,
104 struct drm_crtc *crtc,
105 struct drm_framebuffer *fb,
106 struct drm_rect *src,
107 struct drm_rect *dst,
108 unsigned int rotation,
112 bool can_update_disabled,
115 struct drm_plane_state plane_state = {
121 .src_w = drm_rect_width(src),
122 .src_h = drm_rect_height(src),
125 .crtc_w = drm_rect_width(dst),
126 .crtc_h = drm_rect_height(dst),
127 .rotation = rotation,
129 struct drm_crtc_state crtc_state = {
131 .enable = crtc->enabled,
136 ret = drm_atomic_helper_check_plane_state(&plane_state, &crtc_state,
137 min_scale, max_scale,
139 can_update_disabled);
143 *src = plane_state.src;
144 *dst = plane_state.dst;
145 *visible = plane_state.visible;
151 * drm_plane_helper_update_primary - Helper for updating primary planes
152 * @plane: plane to update
153 * @crtc: the plane's new CRTC
154 * @fb: the plane's new framebuffer
155 * @crtc_x: x coordinate within CRTC
156 * @crtc_y: y coordinate within CRTC
157 * @crtc_w: width coordinate within CRTC
158 * @crtc_h: height coordinate within CRTC
159 * @src_x: x coordinate within source
160 * @src_y: y coordinate within source
161 * @src_w: width coordinate within source
162 * @src_h: height coordinate within source
163 * @ctx: modeset locking context
165 * This helper validates the given parameters and updates the primary plane.
167 * This function is only useful for non-atomic modesetting. Don't use
171 * Zero on success, or an errno code otherwise.
173 int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *crtc,
174 struct drm_framebuffer *fb,
175 int crtc_x, int crtc_y,
176 unsigned int crtc_w, unsigned int crtc_h,
177 uint32_t src_x, uint32_t src_y,
178 uint32_t src_w, uint32_t src_h,
179 struct drm_modeset_acquire_ctx *ctx)
181 struct drm_mode_set set = {
188 struct drm_rect src = {
194 struct drm_rect dest = {
197 .x2 = crtc_x + crtc_w,
198 .y2 = crtc_y + crtc_h,
200 struct drm_device *dev = plane->dev;
201 struct drm_connector **connector_list;
202 int num_connectors, ret;
205 if (drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev)))
208 ret = drm_plane_helper_check_update(plane, crtc, fb,
211 DRM_PLANE_NO_SCALING,
212 DRM_PLANE_NO_SCALING,
213 false, false, &visible);
219 * Primary plane isn't visible. Note that unless a driver
220 * provides their own disable function, this will just
221 * wind up returning -EINVAL to userspace.
223 return plane->funcs->disable_plane(plane, ctx);
225 /* Find current connectors for CRTC */
226 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
227 BUG_ON(num_connectors == 0);
228 connector_list = kcalloc(num_connectors, sizeof(*connector_list),
232 get_connectors_for_crtc(crtc, connector_list, num_connectors);
234 set.connectors = connector_list;
235 set.num_connectors = num_connectors;
238 * We call set_config() directly here rather than using
239 * drm_mode_set_config_internal. We're reprogramming the same
240 * connectors that were already in use, so we shouldn't need the extra
241 * cross-CRTC fb refcounting to accommodate stealing connectors.
242 * drm_mode_setplane() already handles the basic refcounting for the
243 * framebuffers involved in this operation.
245 ret = crtc->funcs->set_config(&set, ctx);
247 kfree(connector_list);
250 EXPORT_SYMBOL(drm_plane_helper_update_primary);
253 * drm_plane_helper_disable_primary - Helper for disabling primary planes
254 * @plane: plane to disable
255 * @ctx: modeset locking context
257 * This helper returns an error when trying to disable the primary
260 * This function is only useful for non-atomic modesetting. Don't use
266 int drm_plane_helper_disable_primary(struct drm_plane *plane,
267 struct drm_modeset_acquire_ctx *ctx)
269 struct drm_device *dev = plane->dev;
271 drm_WARN_ON_ONCE(dev, drm_drv_uses_atomic_modeset(dev));
275 EXPORT_SYMBOL(drm_plane_helper_disable_primary);
278 * drm_plane_helper_destroy() - Helper for primary plane destruction
279 * @plane: plane to destroy
281 * Provides a default plane destroy handler for primary planes. This handler
282 * is called during CRTC destruction. We disable the primary plane, remove
283 * it from the DRM plane list, and deallocate the plane structure.
285 void drm_plane_helper_destroy(struct drm_plane *plane)
287 drm_plane_cleanup(plane);
290 EXPORT_SYMBOL(drm_plane_helper_destroy);
293 * drm_plane_helper_atomic_check() - Helper to check plane atomic-state
294 * @plane: plane to check
295 * @state: atomic state object
297 * Provides a default plane-state check handler for planes whose atomic-state
298 * scale and positioning are not expected to change since the plane is always
299 * a fullscreen scanout buffer.
301 * This is often the case for the primary plane of simple framebuffers.
304 * Zero on success, or an errno code otherwise.
306 int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state)
308 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
309 struct drm_crtc *new_crtc = new_plane_state->crtc;
310 struct drm_crtc_state *new_crtc_state = NULL;
313 new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
315 return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
316 DRM_PLANE_NO_SCALING,
317 DRM_PLANE_NO_SCALING,
320 EXPORT_SYMBOL(drm_plane_helper_atomic_check);