2 * The list_sort function is (presumably) licensed under the GPL (see the
3 * top level "COPYING" file for details).
5 * The remainder of this file is:
7 * Copyright © 1997-2003 by The XFree86 Project, Inc.
8 * Copyright © 2007 Dave Airlie
9 * Copyright © 2007-2008 Intel Corporation
10 * Jesse Barnes <jesse.barnes@intel.com>
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included in
20 * all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
30 * Except as contained in this notice, the name of the copyright holder(s)
31 * and author(s) shall not be used in advertising or otherwise to promote
32 * the sale, use or other dealings in this Software without prior written
33 * authorization from the copyright holder(s) and author(s).
36 #include <linux/list.h>
42 * drm_mode_debug_printmodeline - debug print a mode
44 * @mode: mode to print
49 * Describe @mode using DRM_DEBUG.
51 void drm_mode_debug_printmodeline(struct drm_display_mode *mode)
53 DRM_DEBUG("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
54 mode->base.id, mode->name, mode->vrefresh, mode->clock,
55 mode->hdisplay, mode->hsync_start,
56 mode->hsync_end, mode->htotal,
57 mode->vdisplay, mode->vsync_start,
58 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
60 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
63 * drm_mode_set_name - set the name on a mode
64 * @mode: name will be set in this mode
69 * Set the name of @mode to a standard format.
71 void drm_mode_set_name(struct drm_display_mode *mode)
73 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d", mode->hdisplay,
76 EXPORT_SYMBOL(drm_mode_set_name);
79 * drm_mode_list_concat - move modes from one list to another
84 * Caller must ensure both lists are locked.
86 * Move all the modes from @head to @new.
88 void drm_mode_list_concat(struct list_head *head, struct list_head *new)
91 struct list_head *entry, *tmp;
93 list_for_each_safe(entry, tmp, head) {
94 list_move_tail(entry, new);
97 EXPORT_SYMBOL(drm_mode_list_concat);
100 * drm_mode_width - get the width of a mode
106 * Return @mode's width (hdisplay) value.
108 * FIXME: is this needed?
113 int drm_mode_width(struct drm_display_mode *mode)
115 return mode->hdisplay;
118 EXPORT_SYMBOL(drm_mode_width);
121 * drm_mode_height - get the height of a mode
127 * Return @mode's height (vdisplay) value.
129 * FIXME: is this needed?
134 int drm_mode_height(struct drm_display_mode *mode)
136 return mode->vdisplay;
138 EXPORT_SYMBOL(drm_mode_height);
141 * drm_mode_vrefresh - get the vrefresh of a mode
147 * Return @mode's vrefresh rate or calculate it if necessary.
149 * FIXME: why is this needed? shouldn't vrefresh be set already?
152 * Vertical refresh rate of @mode x 1000. For precision reasons.
154 int drm_mode_vrefresh(struct drm_display_mode *mode)
157 unsigned int calc_val;
159 if (mode->vrefresh > 0)
160 refresh = mode->vrefresh;
161 else if (mode->htotal > 0 && mode->vtotal > 0) {
162 /* work out vrefresh the value will be x1000 */
163 calc_val = (mode->clock * 1000);
165 calc_val /= mode->htotal;
167 calc_val /= mode->vtotal;
170 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
172 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
175 refresh /= mode->vscan;
179 EXPORT_SYMBOL(drm_mode_vrefresh);
182 * drm_mode_set_crtcinfo - set CRTC modesetting parameters
184 * @adjust_flags: unused? (FIXME)
189 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
191 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
193 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
196 p->crtc_hdisplay = p->hdisplay;
197 p->crtc_hsync_start = p->hsync_start;
198 p->crtc_hsync_end = p->hsync_end;
199 p->crtc_htotal = p->htotal;
200 p->crtc_hskew = p->hskew;
201 p->crtc_vdisplay = p->vdisplay;
202 p->crtc_vsync_start = p->vsync_start;
203 p->crtc_vsync_end = p->vsync_end;
204 p->crtc_vtotal = p->vtotal;
206 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
207 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
208 p->crtc_vdisplay /= 2;
209 p->crtc_vsync_start /= 2;
210 p->crtc_vsync_end /= 2;
217 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
218 p->crtc_vdisplay *= 2;
219 p->crtc_vsync_start *= 2;
220 p->crtc_vsync_end *= 2;
225 p->crtc_vdisplay *= p->vscan;
226 p->crtc_vsync_start *= p->vscan;
227 p->crtc_vsync_end *= p->vscan;
228 p->crtc_vtotal *= p->vscan;
231 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
232 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
233 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
234 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
236 p->crtc_hadjusted = false;
237 p->crtc_vadjusted = false;
239 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
243 * drm_mode_duplicate - allocate and duplicate an existing mode
244 * @m: mode to duplicate
249 * Just allocate a new mode, copy the existing mode into it, and return
250 * a pointer to it. Used to create new instances of established modes.
252 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
253 struct drm_display_mode *mode)
255 struct drm_display_mode *nmode;
258 nmode = drm_mode_create(dev);
262 new_id = nmode->base.id;
264 nmode->base.id = new_id;
265 INIT_LIST_HEAD(&nmode->head);
268 EXPORT_SYMBOL(drm_mode_duplicate);
271 * drm_mode_equal - test modes for equality
273 * @mode2: second mode
278 * Check to see if @mode1 and @mode2 are equivalent.
281 * True if the modes are equal, false otherwise.
283 bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
285 /* do clock check convert to PICOS so fb modes get matched
287 if (mode1->clock && mode2->clock) {
288 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
290 } else if (mode1->clock != mode2->clock)
293 if (mode1->hdisplay == mode2->hdisplay &&
294 mode1->hsync_start == mode2->hsync_start &&
295 mode1->hsync_end == mode2->hsync_end &&
296 mode1->htotal == mode2->htotal &&
297 mode1->hskew == mode2->hskew &&
298 mode1->vdisplay == mode2->vdisplay &&
299 mode1->vsync_start == mode2->vsync_start &&
300 mode1->vsync_end == mode2->vsync_end &&
301 mode1->vtotal == mode2->vtotal &&
302 mode1->vscan == mode2->vscan &&
303 mode1->flags == mode2->flags)
308 EXPORT_SYMBOL(drm_mode_equal);
311 * drm_mode_validate_size - make sure modes adhere to size constraints
313 * @mode_list: list of modes to check
314 * @maxX: maximum width
315 * @maxY: maximum height
316 * @maxPitch: max pitch
319 * Caller must hold a lock protecting @mode_list.
321 * The DRM device (@dev) has size and pitch limits. Here we validate the
322 * modes we probed for @dev against those limits and set their status as
325 void drm_mode_validate_size(struct drm_device *dev,
326 struct list_head *mode_list,
327 int maxX, int maxY, int maxPitch)
329 struct drm_display_mode *mode;
331 list_for_each_entry(mode, mode_list, head) {
332 if (maxPitch > 0 && mode->hdisplay > maxPitch)
333 mode->status = MODE_BAD_WIDTH;
335 if (maxX > 0 && mode->hdisplay > maxX)
336 mode->status = MODE_VIRTUAL_X;
338 if (maxY > 0 && mode->vdisplay > maxY)
339 mode->status = MODE_VIRTUAL_Y;
342 EXPORT_SYMBOL(drm_mode_validate_size);
345 * drm_mode_validate_clocks - validate modes against clock limits
347 * @mode_list: list of modes to check
348 * @min: minimum clock rate array
349 * @max: maximum clock rate array
350 * @n_ranges: number of clock ranges (size of arrays)
353 * Caller must hold a lock protecting @mode_list.
355 * Some code may need to check a mode list against the clock limits of the
356 * device in question. This function walks the mode list, testing to make
357 * sure each mode falls within a given range (defined by @min and @max
358 * arrays) and sets @mode->status as needed.
360 void drm_mode_validate_clocks(struct drm_device *dev,
361 struct list_head *mode_list,
362 int *min, int *max, int n_ranges)
364 struct drm_display_mode *mode;
367 list_for_each_entry(mode, mode_list, head) {
369 for (i = 0; i < n_ranges; i++) {
370 if (mode->clock >= min[i] && mode->clock <= max[i]) {
376 mode->status = MODE_CLOCK_RANGE;
379 EXPORT_SYMBOL(drm_mode_validate_clocks);
382 * drm_mode_prune_invalid - remove invalid modes from mode list
384 * @mode_list: list of modes to check
385 * @verbose: be verbose about it
388 * Caller must hold a lock protecting @mode_list.
390 * Once mode list generation is complete, a caller can use this routine to
391 * remove invalid modes from a mode list. If any of the modes have a
392 * status other than %MODE_OK, they are removed from @mode_list and freed.
394 void drm_mode_prune_invalid(struct drm_device *dev,
395 struct list_head *mode_list, bool verbose)
397 struct drm_display_mode *mode, *t;
399 list_for_each_entry_safe(mode, t, mode_list, head) {
400 if (mode->status != MODE_OK) {
401 list_del(&mode->head);
403 drm_mode_debug_printmodeline(mode);
404 DRM_DEBUG("Not using %s mode %d\n", mode->name, mode->status);
406 drm_mode_destroy(dev, mode);
410 EXPORT_SYMBOL(drm_mode_prune_invalid);
413 * drm_mode_compare - compare modes for favorability
414 * @lh_a: list_head for first mode
415 * @lh_b: list_head for second mode
420 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
424 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
425 * positive if @lh_b is better than @lh_a.
427 static int drm_mode_compare(struct list_head *lh_a, struct list_head *lh_b)
429 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
430 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
433 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
434 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
437 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
440 diff = b->clock - a->clock;
444 /* FIXME: what we don't have a list sort function? */
445 /* list sort from Mark J Roberts (mjr@znex.org) */
446 void list_sort(struct list_head *head,
447 int (*cmp)(struct list_head *a, struct list_head *b))
449 struct list_head *p, *q, *e, *list, *tail, *oldhead;
450 int insize, nmerges, psize, qsize, i;
464 for (i = 0; i < insize; i++) {
466 q = q->next == oldhead ? NULL : q->next;
472 while (psize > 0 || (qsize > 0 && q)) {
479 } else if (!qsize || !q) {
485 } else if (cmp(p, q) <= 0) {
518 head->prev = list->prev;
519 list->prev->next = head;
524 * drm_mode_sort - sort mode list
525 * @mode_list: list to sort
528 * Caller must hold a lock protecting @mode_list.
530 * Sort @mode_list by favorability, putting good modes first.
532 void drm_mode_sort(struct list_head *mode_list)
534 list_sort(mode_list, drm_mode_compare);
536 EXPORT_SYMBOL(drm_mode_sort);
539 * drm_mode_connector_list_update - update the mode list for the connector
540 * @connector: the connector to update
543 * Caller must hold a lock protecting @mode_list.
545 * This moves the modes from the @connector probed_modes list
546 * to the actual mode list. It compares the probed mode against the current
547 * list and only adds different modes. All modes unverified after this point
548 * will be removed by the prune invalid modes.
550 void drm_mode_connector_list_update(struct drm_connector *connector)
552 struct drm_display_mode *mode;
553 struct drm_display_mode *pmode, *pt;
556 list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
559 /* go through current modes checking for the new probed mode */
560 list_for_each_entry(mode, &connector->modes, head) {
561 if (drm_mode_equal(pmode, mode)) {
563 /* if equal delete the probed mode */
564 mode->status = pmode->status;
565 list_del(&pmode->head);
566 drm_mode_destroy(connector->dev, pmode);
572 list_move_tail(&pmode->head, &connector->modes);
576 EXPORT_SYMBOL(drm_mode_connector_list_update);