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_rect.h>
29 #include <drm/drm_plane_helper.h>
31 #define SUBPIXEL_MASK 0xffff
34 * This is the minimal list of formats that seem to be safe for modeset use
35 * with all current DRM drivers. Most hardware can actually support more
36 * formats than this and drivers may specify a more accurate list when
37 * creating the primary plane. However drivers that still call
38 * drm_plane_init() will use this minimal format list as the default.
40 static const uint32_t safe_modeset_formats[] = {
46 * Returns the connectors currently associated with a CRTC. This function
47 * should be called twice: once with a NULL connector list to retrieve
48 * the list size, and once with the properly allocated list to be filled in.
50 static int get_connectors_for_crtc(struct drm_crtc *crtc,
51 struct drm_connector **connector_list,
54 struct drm_device *dev = crtc->dev;
55 struct drm_connector *connector;
59 * Note: Once we change the plane hooks to more fine-grained locking we
60 * need to grab the connection_mutex here to be able to make these
63 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
65 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
66 if (connector->encoder && connector->encoder->crtc == crtc) {
67 if (connector_list != NULL && count < num_connectors)
68 *(connector_list++) = connector;
77 * drm_plane_helper_check_update() - Check plane update for validity
78 * @plane: plane object to update
79 * @crtc: owning CRTC of owning plane
80 * @fb: framebuffer to flip onto plane
81 * @src: source coordinates in 16.16 fixed point
82 * @dest: integer destination coordinates
83 * @clip: integer clipping coordinates
84 * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
85 * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
86 * @can_position: is it legal to position the plane such that it
87 * doesn't cover the entire crtc? This will generally
88 * only be false for primary planes.
89 * @can_update_disabled: can the plane be updated while the crtc
91 * @visible: output parameter indicating whether plane is still visible after
94 * Checks that a desired plane update is valid. Drivers that provide
95 * their own plane handling rather than helper-provided implementations may
96 * still wish to call this function to avoid duplication of error checking
100 * Zero if update appears valid, error code on failure
102 int drm_plane_helper_check_update(struct drm_plane *plane,
103 struct drm_crtc *crtc,
104 struct drm_framebuffer *fb,
105 struct drm_rect *src,
106 struct drm_rect *dest,
107 const struct drm_rect *clip,
111 bool can_update_disabled,
116 if (!crtc->enabled && !can_update_disabled) {
117 DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
122 hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale);
123 vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale);
124 if (hscale < 0 || vscale < 0) {
125 DRM_DEBUG_KMS("Invalid scaling of plane\n");
129 *visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
132 * Plane isn't visible; some drivers can handle this
133 * so we just return success here. Drivers that can't
134 * (including those that use the primary plane helper's
135 * update function) will return an error from their
136 * update_plane handler.
140 if (!can_position && !drm_rect_equals(dest, clip)) {
141 DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
147 EXPORT_SYMBOL(drm_plane_helper_check_update);
150 * drm_primary_helper_update() - Helper for primary plane update
151 * @plane: plane object to update
152 * @crtc: owning CRTC of owning plane
153 * @fb: framebuffer to flip onto plane
154 * @crtc_x: x offset of primary plane on crtc
155 * @crtc_y: y offset of primary plane on crtc
156 * @crtc_w: width of primary plane rectangle on crtc
157 * @crtc_h: height of primary plane rectangle on crtc
158 * @src_x: x offset of @fb for panning
159 * @src_y: y offset of @fb for panning
160 * @src_w: width of source rectangle in @fb
161 * @src_h: height of source rectangle in @fb
163 * Provides a default plane update handler for primary planes. This is handler
164 * is called in response to a userspace SetPlane operation on the plane with a
165 * non-NULL framebuffer. We call the driver's modeset handler to update the
168 * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
171 * Note that we make some assumptions about hardware limitations that may not be
172 * true for all hardware --
173 * 1) Primary plane cannot be repositioned.
174 * 2) Primary plane cannot be scaled.
175 * 3) Primary plane must cover the entire CRTC.
176 * 4) Subpixel positioning is not supported.
177 * Drivers for hardware that don't have these restrictions can provide their
178 * own implementation rather than using this helper.
181 * Zero on success, error code on failure
183 int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
184 struct drm_framebuffer *fb,
185 int crtc_x, int crtc_y,
186 unsigned int crtc_w, unsigned int crtc_h,
187 uint32_t src_x, uint32_t src_y,
188 uint32_t src_w, uint32_t src_h)
190 struct drm_mode_set set = {
197 struct drm_rect dest = {
200 .x2 = crtc_x + crtc_w,
201 .y2 = crtc_y + crtc_h,
203 struct drm_rect clip = {
204 .x2 = crtc->mode.hdisplay,
205 .y2 = crtc->mode.vdisplay,
207 struct drm_connector **connector_list;
208 int num_connectors, ret;
210 if (!crtc->enabled) {
211 DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n");
215 /* Disallow subpixel positioning */
216 if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
217 DRM_DEBUG_KMS("Primary plane does not support subpixel positioning\n");
221 /* Primary planes are locked to their owning CRTC */
222 if (plane->possible_crtcs != drm_crtc_mask(crtc)) {
223 DRM_DEBUG_KMS("Cannot change primary plane CRTC\n");
227 /* Disallow scaling */
230 if (crtc_w != src_w || crtc_h != src_h) {
231 DRM_DEBUG_KMS("Can't scale primary plane\n");
235 /* Make sure primary plane covers entire CRTC */
236 drm_rect_intersect(&dest, &clip);
237 if (dest.x1 != 0 || dest.y1 != 0 ||
238 dest.x2 != crtc->mode.hdisplay || dest.y2 != crtc->mode.vdisplay) {
239 DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n");
243 /* Framebuffer must be big enough to cover entire plane */
244 ret = drm_crtc_check_viewport(crtc, crtc_x, crtc_y, &crtc->mode, fb);
248 /* Find current connectors for CRTC */
249 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
250 BUG_ON(num_connectors == 0);
251 connector_list = kzalloc(num_connectors * sizeof(*connector_list),
255 get_connectors_for_crtc(crtc, connector_list, num_connectors);
257 set.connectors = connector_list;
258 set.num_connectors = num_connectors;
261 * We call set_config() directly here rather than using
262 * drm_mode_set_config_internal. We're reprogramming the same
263 * connectors that were already in use, so we shouldn't need the extra
264 * cross-CRTC fb refcounting to accomodate stealing connectors.
265 * drm_mode_setplane() already handles the basic refcounting for the
266 * framebuffers involved in this operation.
268 ret = crtc->funcs->set_config(&set);
270 kfree(connector_list);
273 EXPORT_SYMBOL(drm_primary_helper_update);
276 * drm_primary_helper_disable() - Helper for primary plane disable
277 * @plane: plane to disable
279 * Provides a default plane disable handler for primary planes. This is handler
280 * is called in response to a userspace SetPlane operation on the plane with a
281 * NULL framebuffer parameter. We call the driver's modeset handler with a NULL
282 * framebuffer to disable the CRTC if no other planes are currently enabled.
283 * If other planes are still enabled on the same CRTC, we return -EBUSY.
285 * Note that some hardware may be able to disable the primary plane without
286 * disabling the whole CRTC. Drivers for such hardware should provide their
287 * own disable handler that disables just the primary plane (and they'll likely
288 * need to provide their own update handler as well to properly re-enable a
289 * disabled primary plane).
292 * Zero on success, error code on failure
294 int drm_primary_helper_disable(struct drm_plane *plane)
297 struct drm_mode_set set = {
302 if (plane->crtc == NULL || plane->fb == NULL)
303 /* Already disabled */
306 list_for_each_entry(p, &plane->dev->mode_config.plane_list, head)
307 if (p != plane && p->fb) {
308 DRM_DEBUG_KMS("Cannot disable primary plane while other planes are still active on CRTC.\n");
313 * N.B. We call set_config() directly here rather than
314 * drm_mode_set_config_internal() since drm_mode_setplane() already
315 * handles the basic refcounting and we don't need the special
316 * cross-CRTC refcounting (no chance of stealing connectors from
317 * other CRTC's with this update).
319 return plane->crtc->funcs->set_config(&set);
321 EXPORT_SYMBOL(drm_primary_helper_disable);
324 * drm_primary_helper_destroy() - Helper for primary plane destruction
325 * @plane: plane to destroy
327 * Provides a default plane destroy handler for primary planes. This handler
328 * is called during CRTC destruction. We disable the primary plane, remove
329 * it from the DRM plane list, and deallocate the plane structure.
331 void drm_primary_helper_destroy(struct drm_plane *plane)
333 drm_plane_cleanup(plane);
336 EXPORT_SYMBOL(drm_primary_helper_destroy);
338 const struct drm_plane_funcs drm_primary_helper_funcs = {
339 .update_plane = drm_primary_helper_update,
340 .disable_plane = drm_primary_helper_disable,
341 .destroy = drm_primary_helper_destroy,
343 EXPORT_SYMBOL(drm_primary_helper_funcs);
346 * drm_primary_helper_create_plane() - Create a generic primary plane
348 * @formats: pixel formats supported, or NULL for a default safe list
349 * @num_formats: size of @formats; ignored if @formats is NULL
351 * Allocates and initializes a primary plane that can be used with the primary
352 * plane helpers. Drivers that wish to use driver-specific plane structures or
353 * provide custom handler functions may perform their own allocation and
354 * initialization rather than calling this function.
356 struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
357 const uint32_t *formats,
360 struct drm_plane *primary;
363 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
364 if (primary == NULL) {
365 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
369 if (formats == NULL) {
370 formats = safe_modeset_formats;
371 num_formats = ARRAY_SIZE(safe_modeset_formats);
374 /* possible_crtc's will be filled in later by crtc_init */
375 ret = drm_universal_plane_init(dev, primary, 0,
376 &drm_primary_helper_funcs,
377 formats, num_formats,
378 DRM_PLANE_TYPE_PRIMARY);
386 EXPORT_SYMBOL(drm_primary_helper_create_plane);
389 * drm_crtc_init - Legacy CRTC initialization function
391 * @crtc: CRTC object to init
392 * @funcs: callbacks for the new CRTC
394 * Initialize a CRTC object with a default helper-provided primary plane and no
398 * Zero on success, error code on failure.
400 int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
401 const struct drm_crtc_funcs *funcs)
403 struct drm_plane *primary;
405 primary = drm_primary_helper_create_plane(dev, NULL, 0);
406 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);
408 EXPORT_SYMBOL(drm_crtc_init);