Root/drivers/gpu/drm/drm_modes.c

1/*
2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 * Copyright 2005-2006 Luc Verhaegen
7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Except as contained in this notice, the name of the copyright holder(s)
28 * and author(s) shall not be used in advertising or otherwise to promote
29 * the sale, use or other dealings in this Software without prior written
30 * authorization from the copyright holder(s) and author(s).
31 */
32
33#include <linux/list.h>
34#include <linux/list_sort.h>
35#include <linux/export.h>
36#include "drmP.h"
37#include "drm.h"
38#include "drm_crtc.h"
39
40/**
41 * drm_mode_debug_printmodeline - debug print a mode
42 * @dev: DRM device
43 * @mode: mode to print
44 *
45 * LOCKING:
46 * None.
47 *
48 * Describe @mode using DRM_DEBUG.
49 */
50void drm_mode_debug_printmodeline(struct drm_display_mode *mode)
51{
52    DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
53            "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);
59}
60EXPORT_SYMBOL(drm_mode_debug_printmodeline);
61
62/**
63 * drm_cvt_mode -create a modeline based on CVT algorithm
64 * @dev: DRM device
65 * @hdisplay: hdisplay size
66 * @vdisplay: vdisplay size
67 * @vrefresh : vrefresh rate
68 * @reduced : Whether the GTF calculation is simplified
69 * @interlaced:Whether the interlace is supported
70 *
71 * LOCKING:
72 * none.
73 *
74 * return the modeline based on CVT algorithm
75 *
76 * This function is called to generate the modeline based on CVT algorithm
77 * according to the hdisplay, vdisplay, vrefresh.
78 * It is based from the VESA(TM) Coordinated Video Timing Generator by
79 * Graham Loveridge April 9, 2003 available at
80 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
81 *
82 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
83 * What I have done is to translate it by using integer calculation.
84 */
85#define HV_FACTOR 1000
86struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
87                      int vdisplay, int vrefresh,
88                      bool reduced, bool interlaced, bool margins)
89{
90    /* 1) top/bottom margin size (% of height) - default: 1.8, */
91#define CVT_MARGIN_PERCENTAGE 18
92    /* 2) character cell horizontal granularity (pixels) - default 8 */
93#define CVT_H_GRANULARITY 8
94    /* 3) Minimum vertical porch (lines) - default 3 */
95#define CVT_MIN_V_PORCH 3
96    /* 4) Minimum number of vertical back porch lines - default 6 */
97#define CVT_MIN_V_BPORCH 6
98    /* Pixel Clock step (kHz) */
99#define CVT_CLOCK_STEP 250
100    struct drm_display_mode *drm_mode;
101    unsigned int vfieldrate, hperiod;
102    int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
103    int interlace;
104
105    /* allocate the drm_display_mode structure. If failure, we will
106     * return directly
107     */
108    drm_mode = drm_mode_create(dev);
109    if (!drm_mode)
110        return NULL;
111
112    /* the CVT default refresh rate is 60Hz */
113    if (!vrefresh)
114        vrefresh = 60;
115
116    /* the required field fresh rate */
117    if (interlaced)
118        vfieldrate = vrefresh * 2;
119    else
120        vfieldrate = vrefresh;
121
122    /* horizontal pixels */
123    hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
124
125    /* determine the left&right borders */
126    hmargin = 0;
127    if (margins) {
128        hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
129        hmargin -= hmargin % CVT_H_GRANULARITY;
130    }
131    /* find the total active pixels */
132    drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
133
134    /* find the number of lines per field */
135    if (interlaced)
136        vdisplay_rnd = vdisplay / 2;
137    else
138        vdisplay_rnd = vdisplay;
139
140    /* find the top & bottom borders */
141    vmargin = 0;
142    if (margins)
143        vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
144
145    drm_mode->vdisplay = vdisplay + 2 * vmargin;
146
147    /* Interlaced */
148    if (interlaced)
149        interlace = 1;
150    else
151        interlace = 0;
152
153    /* Determine VSync Width from aspect ratio */
154    if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
155        vsync = 4;
156    else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
157        vsync = 5;
158    else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
159        vsync = 6;
160    else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
161        vsync = 7;
162    else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
163        vsync = 7;
164    else /* custom */
165        vsync = 10;
166
167    if (!reduced) {
168        /* simplify the GTF calculation */
169        /* 4) Minimum time of vertical sync + back porch interval (µs)
170         * default 550.0
171         */
172        int tmp1, tmp2;
173#define CVT_MIN_VSYNC_BP 550
174        /* 3) Nominal HSync width (% of line period) - default 8 */
175#define CVT_HSYNC_PERCENTAGE 8
176        unsigned int hblank_percentage;
177        int vsyncandback_porch, vback_porch, hblank;
178
179        /* estimated the horizontal period */
180        tmp1 = HV_FACTOR * 1000000 -
181                CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
182        tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
183                interlace;
184        hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
185
186        tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
187        /* 9. Find number of lines in sync + backporch */
188        if (tmp1 < (vsync + CVT_MIN_V_PORCH))
189            vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
190        else
191            vsyncandback_porch = tmp1;
192        /* 10. Find number of lines in back porch */
193        vback_porch = vsyncandback_porch - vsync;
194        drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
195                vsyncandback_porch + CVT_MIN_V_PORCH;
196        /* 5) Definition of Horizontal blanking time limitation */
197        /* Gradient (%/kHz) - default 600 */
198#define CVT_M_FACTOR 600
199        /* Offset (%) - default 40 */
200#define CVT_C_FACTOR 40
201        /* Blanking time scaling factor - default 128 */
202#define CVT_K_FACTOR 128
203        /* Scaling factor weighting - default 20 */
204#define CVT_J_FACTOR 20
205#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
206#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
207             CVT_J_FACTOR)
208        /* 12. Find ideal blanking duty cycle from formula */
209        hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
210                    hperiod / 1000;
211        /* 13. Blanking time */
212        if (hblank_percentage < 20 * HV_FACTOR)
213            hblank_percentage = 20 * HV_FACTOR;
214        hblank = drm_mode->hdisplay * hblank_percentage /
215             (100 * HV_FACTOR - hblank_percentage);
216        hblank -= hblank % (2 * CVT_H_GRANULARITY);
217        /* 14. find the total pixes per line */
218        drm_mode->htotal = drm_mode->hdisplay + hblank;
219        drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
220        drm_mode->hsync_start = drm_mode->hsync_end -
221            (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
222        drm_mode->hsync_start += CVT_H_GRANULARITY -
223            drm_mode->hsync_start % CVT_H_GRANULARITY;
224        /* fill the Vsync values */
225        drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
226        drm_mode->vsync_end = drm_mode->vsync_start + vsync;
227    } else {
228        /* Reduced blanking */
229        /* Minimum vertical blanking interval time (µs)- default 460 */
230#define CVT_RB_MIN_VBLANK 460
231        /* Fixed number of clocks for horizontal sync */
232#define CVT_RB_H_SYNC 32
233        /* Fixed number of clocks for horizontal blanking */
234#define CVT_RB_H_BLANK 160
235        /* Fixed number of lines for vertical front porch - default 3*/
236#define CVT_RB_VFPORCH 3
237        int vbilines;
238        int tmp1, tmp2;
239        /* 8. Estimate Horizontal period. */
240        tmp1 = HV_FACTOR * 1000000 -
241            CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
242        tmp2 = vdisplay_rnd + 2 * vmargin;
243        hperiod = tmp1 / (tmp2 * vfieldrate);
244        /* 9. Find number of lines in vertical blanking */
245        vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
246        /* 10. Check if vertical blanking is sufficient */
247        if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
248            vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
249        /* 11. Find total number of lines in vertical field */
250        drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
251        /* 12. Find total number of pixels in a line */
252        drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
253        /* Fill in HSync values */
254        drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
255        drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
256        /* Fill in VSync values */
257        drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
258        drm_mode->vsync_end = drm_mode->vsync_start + vsync;
259    }
260    /* 15/13. Find pixel clock frequency (kHz for xf86) */
261    drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
262    drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
263    /* 18/16. Find actual vertical frame frequency */
264    /* ignore - just set the mode flag for interlaced */
265    if (interlaced) {
266        drm_mode->vtotal *= 2;
267        drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
268    }
269    /* Fill the mode line name */
270    drm_mode_set_name(drm_mode);
271    if (reduced)
272        drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
273                    DRM_MODE_FLAG_NVSYNC);
274    else
275        drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
276                    DRM_MODE_FLAG_NHSYNC);
277
278    return drm_mode;
279}
280EXPORT_SYMBOL(drm_cvt_mode);
281
282/**
283 * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
284 *
285 * @dev :drm device
286 * @hdisplay :hdisplay size
287 * @vdisplay :vdisplay size
288 * @vrefresh :vrefresh rate.
289 * @interlaced :whether the interlace is supported
290 * @margins :desired margin size
291 * @GTF_[MCKJ] :extended GTF formula parameters
292 *
293 * LOCKING.
294 * none.
295 *
296 * return the modeline based on full GTF algorithm.
297 *
298 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
299 * in here multiplied by two. For a C of 40, pass in 80.
300 */
301struct drm_display_mode *
302drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
303             int vrefresh, bool interlaced, int margins,
304             int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
305{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
306#define GTF_MARGIN_PERCENTAGE 18
307    /* 2) character cell horizontal granularity (pixels) - default 8 */
308#define GTF_CELL_GRAN 8
309    /* 3) Minimum vertical porch (lines) - default 3 */
310#define GTF_MIN_V_PORCH 1
311    /* width of vsync in lines */
312#define V_SYNC_RQD 3
313    /* width of hsync as % of total line */
314#define H_SYNC_PERCENT 8
315    /* min time of vsync + back porch (microsec) */
316#define MIN_VSYNC_PLUS_BP 550
317    /* C' and M' are part of the Blanking Duty Cycle computation */
318#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
319#define GTF_M_PRIME (GTF_K * GTF_M / 256)
320    struct drm_display_mode *drm_mode;
321    unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
322    int top_margin, bottom_margin;
323    int interlace;
324    unsigned int hfreq_est;
325    int vsync_plus_bp, vback_porch;
326    unsigned int vtotal_lines, vfieldrate_est, hperiod;
327    unsigned int vfield_rate, vframe_rate;
328    int left_margin, right_margin;
329    unsigned int total_active_pixels, ideal_duty_cycle;
330    unsigned int hblank, total_pixels, pixel_freq;
331    int hsync, hfront_porch, vodd_front_porch_lines;
332    unsigned int tmp1, tmp2;
333
334    drm_mode = drm_mode_create(dev);
335    if (!drm_mode)
336        return NULL;
337
338    /* 1. In order to give correct results, the number of horizontal
339     * pixels requested is first processed to ensure that it is divisible
340     * by the character size, by rounding it to the nearest character
341     * cell boundary:
342     */
343    hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
344    hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
345
346    /* 2. If interlace is requested, the number of vertical lines assumed
347     * by the calculation must be halved, as the computation calculates
348     * the number of vertical lines per field.
349     */
350    if (interlaced)
351        vdisplay_rnd = vdisplay / 2;
352    else
353        vdisplay_rnd = vdisplay;
354
355    /* 3. Find the frame rate required: */
356    if (interlaced)
357        vfieldrate_rqd = vrefresh * 2;
358    else
359        vfieldrate_rqd = vrefresh;
360
361    /* 4. Find number of lines in Top margin: */
362    top_margin = 0;
363    if (margins)
364        top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
365                1000;
366    /* 5. Find number of lines in bottom margin: */
367    bottom_margin = top_margin;
368
369    /* 6. If interlace is required, then set variable interlace: */
370    if (interlaced)
371        interlace = 1;
372    else
373        interlace = 0;
374
375    /* 7. Estimate the Horizontal frequency */
376    {
377        tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
378        tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
379                2 + interlace;
380        hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
381    }
382
383    /* 8. Find the number of lines in V sync + back porch */
384    /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
385    vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
386    vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
387    /* 9. Find the number of lines in V back porch alone: */
388    vback_porch = vsync_plus_bp - V_SYNC_RQD;
389    /* 10. Find the total number of lines in Vertical field period: */
390    vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
391            vsync_plus_bp + GTF_MIN_V_PORCH;
392    /* 11. Estimate the Vertical field frequency: */
393    vfieldrate_est = hfreq_est / vtotal_lines;
394    /* 12. Find the actual horizontal period: */
395    hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
396
397    /* 13. Find the actual Vertical field frequency: */
398    vfield_rate = hfreq_est / vtotal_lines;
399    /* 14. Find the Vertical frame frequency: */
400    if (interlaced)
401        vframe_rate = vfield_rate / 2;
402    else
403        vframe_rate = vfield_rate;
404    /* 15. Find number of pixels in left margin: */
405    if (margins)
406        left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
407                1000;
408    else
409        left_margin = 0;
410
411    /* 16.Find number of pixels in right margin: */
412    right_margin = left_margin;
413    /* 17.Find total number of active pixels in image and left and right */
414    total_active_pixels = hdisplay_rnd + left_margin + right_margin;
415    /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
416    ideal_duty_cycle = GTF_C_PRIME * 1000 -
417                (GTF_M_PRIME * 1000000 / hfreq_est);
418    /* 19.Find the number of pixels in the blanking time to the nearest
419     * double character cell: */
420    hblank = total_active_pixels * ideal_duty_cycle /
421            (100000 - ideal_duty_cycle);
422    hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
423    hblank = hblank * 2 * GTF_CELL_GRAN;
424    /* 20.Find total number of pixels: */
425    total_pixels = total_active_pixels + hblank;
426    /* 21.Find pixel clock frequency: */
427    pixel_freq = total_pixels * hfreq_est / 1000;
428    /* Stage 1 computations are now complete; I should really pass
429     * the results to another function and do the Stage 2 computations,
430     * but I only need a few more values so I'll just append the
431     * computations here for now */
432    /* 17. Find the number of pixels in the horizontal sync period: */
433    hsync = H_SYNC_PERCENT * total_pixels / 100;
434    hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
435    hsync = hsync * GTF_CELL_GRAN;
436    /* 18. Find the number of pixels in horizontal front porch period */
437    hfront_porch = hblank / 2 - hsync;
438    /* 36. Find the number of lines in the odd front porch period: */
439    vodd_front_porch_lines = GTF_MIN_V_PORCH ;
440
441    /* finally, pack the results in the mode struct */
442    drm_mode->hdisplay = hdisplay_rnd;
443    drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
444    drm_mode->hsync_end = drm_mode->hsync_start + hsync;
445    drm_mode->htotal = total_pixels;
446    drm_mode->vdisplay = vdisplay_rnd;
447    drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
448    drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
449    drm_mode->vtotal = vtotal_lines;
450
451    drm_mode->clock = pixel_freq;
452
453    if (interlaced) {
454        drm_mode->vtotal *= 2;
455        drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
456    }
457
458    drm_mode_set_name(drm_mode);
459    if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
460        drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
461    else
462        drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
463
464    return drm_mode;
465}
466EXPORT_SYMBOL(drm_gtf_mode_complex);
467
468/**
469 * drm_gtf_mode - create the modeline based on GTF algorithm
470 *
471 * @dev :drm device
472 * @hdisplay :hdisplay size
473 * @vdisplay :vdisplay size
474 * @vrefresh :vrefresh rate.
475 * @interlaced :whether the interlace is supported
476 * @margins :whether the margin is supported
477 *
478 * LOCKING.
479 * none.
480 *
481 * return the modeline based on GTF algorithm
482 *
483 * This function is to create the modeline based on the GTF algorithm.
484 * Generalized Timing Formula is derived from:
485 * GTF Spreadsheet by Andy Morrish (1/5/97)
486 * available at http://www.vesa.org
487 *
488 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
489 * What I have done is to translate it by using integer calculation.
490 * I also refer to the function of fb_get_mode in the file of
491 * drivers/video/fbmon.c
492 *
493 * Standard GTF parameters:
494 * M = 600
495 * C = 40
496 * K = 128
497 * J = 20
498 */
499struct drm_display_mode *
500drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
501         bool lace, int margins)
502{
503    return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, lace,
504                    margins, 600, 40 * 2, 128, 20 * 2);
505}
506EXPORT_SYMBOL(drm_gtf_mode);
507
508/**
509 * drm_mode_set_name - set the name on a mode
510 * @mode: name will be set in this mode
511 *
512 * LOCKING:
513 * None.
514 *
515 * Set the name of @mode to a standard format.
516 */
517void drm_mode_set_name(struct drm_display_mode *mode)
518{
519    bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
520
521    snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
522         mode->hdisplay, mode->vdisplay,
523         interlaced ? "i" : "");
524}
525EXPORT_SYMBOL(drm_mode_set_name);
526
527/**
528 * drm_mode_list_concat - move modes from one list to another
529 * @head: source list
530 * @new: dst list
531 *
532 * LOCKING:
533 * Caller must ensure both lists are locked.
534 *
535 * Move all the modes from @head to @new.
536 */
537void drm_mode_list_concat(struct list_head *head, struct list_head *new)
538{
539
540    struct list_head *entry, *tmp;
541
542    list_for_each_safe(entry, tmp, head) {
543        list_move_tail(entry, new);
544    }
545}
546EXPORT_SYMBOL(drm_mode_list_concat);
547
548/**
549 * drm_mode_width - get the width of a mode
550 * @mode: mode
551 *
552 * LOCKING:
553 * None.
554 *
555 * Return @mode's width (hdisplay) value.
556 *
557 * FIXME: is this needed?
558 *
559 * RETURNS:
560 * @mode->hdisplay
561 */
562int drm_mode_width(struct drm_display_mode *mode)
563{
564    return mode->hdisplay;
565
566}
567EXPORT_SYMBOL(drm_mode_width);
568
569/**
570 * drm_mode_height - get the height of a mode
571 * @mode: mode
572 *
573 * LOCKING:
574 * None.
575 *
576 * Return @mode's height (vdisplay) value.
577 *
578 * FIXME: is this needed?
579 *
580 * RETURNS:
581 * @mode->vdisplay
582 */
583int drm_mode_height(struct drm_display_mode *mode)
584{
585    return mode->vdisplay;
586}
587EXPORT_SYMBOL(drm_mode_height);
588
589/** drm_mode_hsync - get the hsync of a mode
590 * @mode: mode
591 *
592 * LOCKING:
593 * None.
594 *
595 * Return @modes's hsync rate in kHz, rounded to the nearest int.
596 */
597int drm_mode_hsync(const struct drm_display_mode *mode)
598{
599    unsigned int calc_val;
600
601    if (mode->hsync)
602        return mode->hsync;
603
604    if (mode->htotal < 0)
605        return 0;
606
607    calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
608    calc_val += 500; /* round to 1000Hz */
609    calc_val /= 1000; /* truncate to kHz */
610
611    return calc_val;
612}
613EXPORT_SYMBOL(drm_mode_hsync);
614
615/**
616 * drm_mode_vrefresh - get the vrefresh of a mode
617 * @mode: mode
618 *
619 * LOCKING:
620 * None.
621 *
622 * Return @mode's vrefresh rate in Hz or calculate it if necessary.
623 *
624 * FIXME: why is this needed? shouldn't vrefresh be set already?
625 *
626 * RETURNS:
627 * Vertical refresh rate. It will be the result of actual value plus 0.5.
628 * If it is 70.288, it will return 70Hz.
629 * If it is 59.6, it will return 60Hz.
630 */
631int drm_mode_vrefresh(const struct drm_display_mode *mode)
632{
633    int refresh = 0;
634    unsigned int calc_val;
635
636    if (mode->vrefresh > 0)
637        refresh = mode->vrefresh;
638    else if (mode->htotal > 0 && mode->vtotal > 0) {
639        int vtotal;
640        vtotal = mode->vtotal;
641        /* work out vrefresh the value will be x1000 */
642        calc_val = (mode->clock * 1000);
643        calc_val /= mode->htotal;
644        refresh = (calc_val + vtotal / 2) / vtotal;
645
646        if (mode->flags & DRM_MODE_FLAG_INTERLACE)
647            refresh *= 2;
648        if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
649            refresh /= 2;
650        if (mode->vscan > 1)
651            refresh /= mode->vscan;
652    }
653    return refresh;
654}
655EXPORT_SYMBOL(drm_mode_vrefresh);
656
657/**
658 * drm_mode_set_crtcinfo - set CRTC modesetting parameters
659 * @p: mode
660 * @adjust_flags: unused? (FIXME)
661 *
662 * LOCKING:
663 * None.
664 *
665 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
666 */
667void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
668{
669    if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
670        return;
671
672    p->crtc_hdisplay = p->hdisplay;
673    p->crtc_hsync_start = p->hsync_start;
674    p->crtc_hsync_end = p->hsync_end;
675    p->crtc_htotal = p->htotal;
676    p->crtc_hskew = p->hskew;
677    p->crtc_vdisplay = p->vdisplay;
678    p->crtc_vsync_start = p->vsync_start;
679    p->crtc_vsync_end = p->vsync_end;
680    p->crtc_vtotal = p->vtotal;
681
682    if (p->flags & DRM_MODE_FLAG_INTERLACE) {
683        if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
684            p->crtc_vdisplay /= 2;
685            p->crtc_vsync_start /= 2;
686            p->crtc_vsync_end /= 2;
687            p->crtc_vtotal /= 2;
688        }
689    }
690
691    if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
692        p->crtc_vdisplay *= 2;
693        p->crtc_vsync_start *= 2;
694        p->crtc_vsync_end *= 2;
695        p->crtc_vtotal *= 2;
696    }
697
698    if (p->vscan > 1) {
699        p->crtc_vdisplay *= p->vscan;
700        p->crtc_vsync_start *= p->vscan;
701        p->crtc_vsync_end *= p->vscan;
702        p->crtc_vtotal *= p->vscan;
703    }
704
705    p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
706    p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
707    p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
708    p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
709}
710EXPORT_SYMBOL(drm_mode_set_crtcinfo);
711
712
713/**
714 * drm_mode_copy - copy the mode
715 * @dst: mode to overwrite
716 * @src: mode to copy
717 *
718 * LOCKING:
719 * None.
720 *
721 * Copy an existing mode into another mode, preserving the object id
722 * of the destination mode.
723 */
724void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
725{
726    int id = dst->base.id;
727
728    *dst = *src;
729    dst->base.id = id;
730    INIT_LIST_HEAD(&dst->head);
731}
732EXPORT_SYMBOL(drm_mode_copy);
733
734/**
735 * drm_mode_duplicate - allocate and duplicate an existing mode
736 * @m: mode to duplicate
737 *
738 * LOCKING:
739 * None.
740 *
741 * Just allocate a new mode, copy the existing mode into it, and return
742 * a pointer to it. Used to create new instances of established modes.
743 */
744struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
745                        const struct drm_display_mode *mode)
746{
747    struct drm_display_mode *nmode;
748
749    nmode = drm_mode_create(dev);
750    if (!nmode)
751        return NULL;
752
753    drm_mode_copy(nmode, mode);
754
755    return nmode;
756}
757EXPORT_SYMBOL(drm_mode_duplicate);
758
759/**
760 * drm_mode_equal - test modes for equality
761 * @mode1: first mode
762 * @mode2: second mode
763 *
764 * LOCKING:
765 * None.
766 *
767 * Check to see if @mode1 and @mode2 are equivalent.
768 *
769 * RETURNS:
770 * True if the modes are equal, false otherwise.
771 */
772bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
773{
774    /* do clock check convert to PICOS so fb modes get matched
775     * the same */
776    if (mode1->clock && mode2->clock) {
777        if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
778            return false;
779    } else if (mode1->clock != mode2->clock)
780        return false;
781
782    if (mode1->hdisplay == mode2->hdisplay &&
783        mode1->hsync_start == mode2->hsync_start &&
784        mode1->hsync_end == mode2->hsync_end &&
785        mode1->htotal == mode2->htotal &&
786        mode1->hskew == mode2->hskew &&
787        mode1->vdisplay == mode2->vdisplay &&
788        mode1->vsync_start == mode2->vsync_start &&
789        mode1->vsync_end == mode2->vsync_end &&
790        mode1->vtotal == mode2->vtotal &&
791        mode1->vscan == mode2->vscan &&
792        mode1->flags == mode2->flags)
793        return true;
794
795    return false;
796}
797EXPORT_SYMBOL(drm_mode_equal);
798
799/**
800 * drm_mode_validate_size - make sure modes adhere to size constraints
801 * @dev: DRM device
802 * @mode_list: list of modes to check
803 * @maxX: maximum width
804 * @maxY: maximum height
805 * @maxPitch: max pitch
806 *
807 * LOCKING:
808 * Caller must hold a lock protecting @mode_list.
809 *
810 * The DRM device (@dev) has size and pitch limits. Here we validate the
811 * modes we probed for @dev against those limits and set their status as
812 * necessary.
813 */
814void drm_mode_validate_size(struct drm_device *dev,
815                struct list_head *mode_list,
816                int maxX, int maxY, int maxPitch)
817{
818    struct drm_display_mode *mode;
819
820    list_for_each_entry(mode, mode_list, head) {
821        if (maxPitch > 0 && mode->hdisplay > maxPitch)
822            mode->status = MODE_BAD_WIDTH;
823
824        if (maxX > 0 && mode->hdisplay > maxX)
825            mode->status = MODE_VIRTUAL_X;
826
827        if (maxY > 0 && mode->vdisplay > maxY)
828            mode->status = MODE_VIRTUAL_Y;
829    }
830}
831EXPORT_SYMBOL(drm_mode_validate_size);
832
833/**
834 * drm_mode_validate_clocks - validate modes against clock limits
835 * @dev: DRM device
836 * @mode_list: list of modes to check
837 * @min: minimum clock rate array
838 * @max: maximum clock rate array
839 * @n_ranges: number of clock ranges (size of arrays)
840 *
841 * LOCKING:
842 * Caller must hold a lock protecting @mode_list.
843 *
844 * Some code may need to check a mode list against the clock limits of the
845 * device in question. This function walks the mode list, testing to make
846 * sure each mode falls within a given range (defined by @min and @max
847 * arrays) and sets @mode->status as needed.
848 */
849void drm_mode_validate_clocks(struct drm_device *dev,
850                  struct list_head *mode_list,
851                  int *min, int *max, int n_ranges)
852{
853    struct drm_display_mode *mode;
854    int i;
855
856    list_for_each_entry(mode, mode_list, head) {
857        bool good = false;
858        for (i = 0; i < n_ranges; i++) {
859            if (mode->clock >= min[i] && mode->clock <= max[i]) {
860                good = true;
861                break;
862            }
863        }
864        if (!good)
865            mode->status = MODE_CLOCK_RANGE;
866    }
867}
868EXPORT_SYMBOL(drm_mode_validate_clocks);
869
870/**
871 * drm_mode_prune_invalid - remove invalid modes from mode list
872 * @dev: DRM device
873 * @mode_list: list of modes to check
874 * @verbose: be verbose about it
875 *
876 * LOCKING:
877 * Caller must hold a lock protecting @mode_list.
878 *
879 * Once mode list generation is complete, a caller can use this routine to
880 * remove invalid modes from a mode list. If any of the modes have a
881 * status other than %MODE_OK, they are removed from @mode_list and freed.
882 */
883void drm_mode_prune_invalid(struct drm_device *dev,
884                struct list_head *mode_list, bool verbose)
885{
886    struct drm_display_mode *mode, *t;
887
888    list_for_each_entry_safe(mode, t, mode_list, head) {
889        if (mode->status != MODE_OK) {
890            list_del(&mode->head);
891            if (verbose) {
892                drm_mode_debug_printmodeline(mode);
893                DRM_DEBUG_KMS("Not using %s mode %d\n",
894                    mode->name, mode->status);
895            }
896            drm_mode_destroy(dev, mode);
897        }
898    }
899}
900EXPORT_SYMBOL(drm_mode_prune_invalid);
901
902/**
903 * drm_mode_compare - compare modes for favorability
904 * @priv: unused
905 * @lh_a: list_head for first mode
906 * @lh_b: list_head for second mode
907 *
908 * LOCKING:
909 * None.
910 *
911 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
912 * which is better.
913 *
914 * RETURNS:
915 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
916 * positive if @lh_b is better than @lh_a.
917 */
918static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
919{
920    struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
921    struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
922    int diff;
923
924    diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
925        ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
926    if (diff)
927        return diff;
928    diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
929    if (diff)
930        return diff;
931    diff = b->clock - a->clock;
932    return diff;
933}
934
935/**
936 * drm_mode_sort - sort mode list
937 * @mode_list: list to sort
938 *
939 * LOCKING:
940 * Caller must hold a lock protecting @mode_list.
941 *
942 * Sort @mode_list by favorability, putting good modes first.
943 */
944void drm_mode_sort(struct list_head *mode_list)
945{
946    list_sort(NULL, mode_list, drm_mode_compare);
947}
948EXPORT_SYMBOL(drm_mode_sort);
949
950/**
951 * drm_mode_connector_list_update - update the mode list for the connector
952 * @connector: the connector to update
953 *
954 * LOCKING:
955 * Caller must hold a lock protecting @mode_list.
956 *
957 * This moves the modes from the @connector probed_modes list
958 * to the actual mode list. It compares the probed mode against the current
959 * list and only adds different modes. All modes unverified after this point
960 * will be removed by the prune invalid modes.
961 */
962void drm_mode_connector_list_update(struct drm_connector *connector)
963{
964    struct drm_display_mode *mode;
965    struct drm_display_mode *pmode, *pt;
966    int found_it;
967
968    list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
969                 head) {
970        found_it = 0;
971        /* go through current modes checking for the new probed mode */
972        list_for_each_entry(mode, &connector->modes, head) {
973            if (drm_mode_equal(pmode, mode)) {
974                found_it = 1;
975                /* if equal delete the probed mode */
976                mode->status = pmode->status;
977                /* Merge type bits together */
978                mode->type |= pmode->type;
979                list_del(&pmode->head);
980                drm_mode_destroy(connector->dev, pmode);
981                break;
982            }
983        }
984
985        if (!found_it) {
986            list_move_tail(&pmode->head, &connector->modes);
987        }
988    }
989}
990EXPORT_SYMBOL(drm_mode_connector_list_update);
991
992/**
993 * drm_mode_parse_command_line_for_connector - parse command line for connector
994 * @mode_option - per connector mode option
995 * @connector - connector to parse line for
996 *
997 * This parses the connector specific then generic command lines for
998 * modes and options to configure the connector.
999 *
1000 * This uses the same parameters as the fb modedb.c, except for extra
1001 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1002 *
1003 * enable/enable Digital/disable bit at the end
1004 */
1005bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1006                           struct drm_connector *connector,
1007                           struct drm_cmdline_mode *mode)
1008{
1009    const char *name;
1010    unsigned int namelen;
1011    bool res_specified = false, bpp_specified = false, refresh_specified = false;
1012    unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1013    bool yres_specified = false, cvt = false, rb = false;
1014    bool interlace = false, margins = false, was_digit = false;
1015    int i;
1016    enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1017
1018#ifdef CONFIG_FB
1019    if (!mode_option)
1020        mode_option = fb_mode_option;
1021#endif
1022
1023    if (!mode_option) {
1024        mode->specified = false;
1025        return false;
1026    }
1027
1028    name = mode_option;
1029    namelen = strlen(name);
1030    for (i = namelen-1; i >= 0; i--) {
1031        switch (name[i]) {
1032        case '@':
1033            if (!refresh_specified && !bpp_specified &&
1034                !yres_specified && !cvt && !rb && was_digit) {
1035                refresh = simple_strtol(&name[i+1], NULL, 10);
1036                refresh_specified = true;
1037                was_digit = false;
1038            } else
1039                goto done;
1040            break;
1041        case '-':
1042            if (!bpp_specified && !yres_specified && !cvt &&
1043                !rb && was_digit) {
1044                bpp = simple_strtol(&name[i+1], NULL, 10);
1045                bpp_specified = true;
1046                was_digit = false;
1047            } else
1048                goto done;
1049            break;
1050        case 'x':
1051            if (!yres_specified && was_digit) {
1052                yres = simple_strtol(&name[i+1], NULL, 10);
1053                yres_specified = true;
1054                was_digit = false;
1055            } else
1056                goto done;
1057        case '0' ... '9':
1058            was_digit = true;
1059            break;
1060        case 'M':
1061            if (yres_specified || cvt || was_digit)
1062                goto done;
1063            cvt = true;
1064            break;
1065        case 'R':
1066            if (yres_specified || cvt || rb || was_digit)
1067                goto done;
1068            rb = true;
1069            break;
1070        case 'm':
1071            if (cvt || yres_specified || was_digit)
1072                goto done;
1073            margins = true;
1074            break;
1075        case 'i':
1076            if (cvt || yres_specified || was_digit)
1077                goto done;
1078            interlace = true;
1079            break;
1080        case 'e':
1081            if (yres_specified || bpp_specified || refresh_specified ||
1082                was_digit || (force != DRM_FORCE_UNSPECIFIED))
1083                goto done;
1084
1085            force = DRM_FORCE_ON;
1086            break;
1087        case 'D':
1088            if (yres_specified || bpp_specified || refresh_specified ||
1089                was_digit || (force != DRM_FORCE_UNSPECIFIED))
1090                goto done;
1091
1092            if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1093                (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1094                force = DRM_FORCE_ON;
1095            else
1096                force = DRM_FORCE_ON_DIGITAL;
1097            break;
1098        case 'd':
1099            if (yres_specified || bpp_specified || refresh_specified ||
1100                was_digit || (force != DRM_FORCE_UNSPECIFIED))
1101                goto done;
1102
1103            force = DRM_FORCE_OFF;
1104            break;
1105        default:
1106            goto done;
1107        }
1108    }
1109
1110    if (i < 0 && yres_specified) {
1111        char *ch;
1112        xres = simple_strtol(name, &ch, 10);
1113        if ((ch != NULL) && (*ch == 'x'))
1114            res_specified = true;
1115        else
1116            i = ch - name;
1117    } else if (!yres_specified && was_digit) {
1118        /* catch mode that begins with digits but has no 'x' */
1119        i = 0;
1120    }
1121done:
1122    if (i >= 0) {
1123        printk(KERN_WARNING
1124            "parse error at position %i in video mode '%s'\n",
1125            i, name);
1126        mode->specified = false;
1127        return false;
1128    }
1129
1130    if (res_specified) {
1131        mode->specified = true;
1132        mode->xres = xres;
1133        mode->yres = yres;
1134    }
1135
1136    if (refresh_specified) {
1137        mode->refresh_specified = true;
1138        mode->refresh = refresh;
1139    }
1140
1141    if (bpp_specified) {
1142        mode->bpp_specified = true;
1143        mode->bpp = bpp;
1144    }
1145    mode->rb = rb;
1146    mode->cvt = cvt;
1147    mode->interlace = interlace;
1148    mode->margins = margins;
1149    mode->force = force;
1150
1151    return true;
1152}
1153EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1154
1155struct drm_display_mode *
1156drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1157                  struct drm_cmdline_mode *cmd)
1158{
1159    struct drm_display_mode *mode;
1160
1161    if (cmd->cvt)
1162        mode = drm_cvt_mode(dev,
1163                    cmd->xres, cmd->yres,
1164                    cmd->refresh_specified ? cmd->refresh : 60,
1165                    cmd->rb, cmd->interlace,
1166                    cmd->margins);
1167    else
1168        mode = drm_gtf_mode(dev,
1169                    cmd->xres, cmd->yres,
1170                    cmd->refresh_specified ? cmd->refresh : 60,
1171                    cmd->interlace,
1172                    cmd->margins);
1173    if (!mode)
1174        return NULL;
1175
1176    drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1177    return mode;
1178}
1179EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1180

Archive Download this file



interactive