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_atomic_uapi.h>
32 #include <drm/drm_crtc_helper.h>
33 #include <drm/drm_encoder.h>
34 #include <drm/drm_atomic_helper.h>
36 #define SUBPIXEL_MASK 0xffff
41 * This helper library has two parts. The first part has support to implement
42 * primary plane support on top of the normal CRTC configuration interface.
43 * Since the legacy &drm_mode_config_funcs.set_config interface ties the primary
44 * plane together with the CRTC state this does not allow userspace to disable
45 * the primary plane itself. The default primary plane only expose XRBG8888 and
46 * ARGB8888 as valid pixel formats for the attached framebuffer.
48 * Drivers are highly recommended to implement proper support for primary
49 * planes, and newly merged drivers must not rely upon these transitional
52 * The second part also implements transitional helpers which allow drivers to
53 * gradually switch to the atomic helper infrastructure for plane updates. Once
54 * that switch is complete drivers shouldn't use these any longer, instead using
55 * the proper legacy implementations for update and disable plane hooks provided
56 * by the atomic helpers.
58 * Again drivers are strongly urged to switch to the new interfaces.
60 * The plane helpers share the function table structures with other helpers,
61 * specifically also the atomic helpers. See &struct drm_plane_helper_funcs for
66 * Returns the connectors currently associated with a CRTC. This function
67 * should be called twice: once with a NULL connector list to retrieve
68 * the list size, and once with the properly allocated list to be filled in.
70 static int get_connectors_for_crtc(struct drm_crtc *crtc,
71 struct drm_connector **connector_list,
74 struct drm_device *dev = crtc->dev;
75 struct drm_connector *connector;
76 struct drm_connector_list_iter conn_iter;
80 * Note: Once we change the plane hooks to more fine-grained locking we
81 * need to grab the connection_mutex here to be able to make these
84 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
86 drm_connector_list_iter_begin(dev, &conn_iter);
87 drm_for_each_connector_iter(connector, &conn_iter) {
88 if (connector->encoder && connector->encoder->crtc == crtc) {
89 if (connector_list != NULL && count < num_connectors)
90 *(connector_list++) = connector;
95 drm_connector_list_iter_end(&conn_iter);
100 static int drm_plane_helper_check_update(struct drm_plane *plane,
101 struct drm_crtc *crtc,
102 struct drm_framebuffer *fb,
103 struct drm_rect *src,
104 struct drm_rect *dst,
105 unsigned int rotation,
109 bool can_update_disabled,
112 struct drm_plane_state plane_state = {
118 .src_w = drm_rect_width(src),
119 .src_h = drm_rect_height(src),
122 .crtc_w = drm_rect_width(dst),
123 .crtc_h = drm_rect_height(dst),
124 .rotation = rotation,
127 struct drm_crtc_state crtc_state = {
129 .enable = crtc->enabled,
134 ret = drm_atomic_helper_check_plane_state(&plane_state, &crtc_state,
135 min_scale, max_scale,
137 can_update_disabled);
141 *src = plane_state.src;
142 *dst = plane_state.dst;
143 *visible = plane_state.visible;
148 static int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
149 struct drm_framebuffer *fb,
150 int crtc_x, int crtc_y,
151 unsigned int crtc_w, unsigned int crtc_h,
152 uint32_t src_x, uint32_t src_y,
153 uint32_t src_w, uint32_t src_h,
154 struct drm_modeset_acquire_ctx *ctx)
156 struct drm_mode_set set = {
163 struct drm_rect src = {
169 struct drm_rect dest = {
172 .x2 = crtc_x + crtc_w,
173 .y2 = crtc_y + crtc_h,
175 struct drm_connector **connector_list;
176 int num_connectors, ret;
179 ret = drm_plane_helper_check_update(plane, crtc, fb,
182 DRM_PLANE_HELPER_NO_SCALING,
183 DRM_PLANE_HELPER_NO_SCALING,
184 false, false, &visible);
190 * Primary plane isn't visible. Note that unless a driver
191 * provides their own disable function, this will just
192 * wind up returning -EINVAL to userspace.
194 return plane->funcs->disable_plane(plane, ctx);
196 /* Find current connectors for CRTC */
197 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
198 BUG_ON(num_connectors == 0);
199 connector_list = kcalloc(num_connectors, sizeof(*connector_list),
203 get_connectors_for_crtc(crtc, connector_list, num_connectors);
205 set.connectors = connector_list;
206 set.num_connectors = num_connectors;
209 * We call set_config() directly here rather than using
210 * drm_mode_set_config_internal. We're reprogramming the same
211 * connectors that were already in use, so we shouldn't need the extra
212 * cross-CRTC fb refcounting to accomodate stealing connectors.
213 * drm_mode_setplane() already handles the basic refcounting for the
214 * framebuffers involved in this operation.
216 ret = crtc->funcs->set_config(&set, ctx);
218 kfree(connector_list);
222 static int drm_primary_helper_disable(struct drm_plane *plane,
223 struct drm_modeset_acquire_ctx *ctx)
229 * drm_primary_helper_destroy() - Helper for primary plane destruction
230 * @plane: plane to destroy
232 * Provides a default plane destroy handler for primary planes. This handler
233 * is called during CRTC destruction. We disable the primary plane, remove
234 * it from the DRM plane list, and deallocate the plane structure.
236 void drm_primary_helper_destroy(struct drm_plane *plane)
238 drm_plane_cleanup(plane);
241 EXPORT_SYMBOL(drm_primary_helper_destroy);
243 const struct drm_plane_funcs drm_primary_helper_funcs = {
244 .update_plane = drm_primary_helper_update,
245 .disable_plane = drm_primary_helper_disable,
246 .destroy = drm_primary_helper_destroy,
248 EXPORT_SYMBOL(drm_primary_helper_funcs);