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1 /*
2  * Copyright (c) 2012 The Chromium OS Authors.
3  *
4  * (C) Copyright 2010
5  * Petr Stetiar <ynezz@true.cz>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  *
9  * Contains stolen code from ddcprobe project which is:
10  * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
11  */
12
13 #include <common.h>
14 #include <edid.h>
15 #include <errno.h>
16 #include <fdtdec.h>
17 #include <linux/ctype.h>
18 #include <linux/string.h>
19
20 int edid_check_info(struct edid1_info *edid_info)
21 {
22         if ((edid_info == NULL) || (edid_info->version == 0))
23                 return -1;
24
25         if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
26                 return -1;
27
28         if (edid_info->version == 0xff && edid_info->revision == 0xff)
29                 return -1;
30
31         return 0;
32 }
33
34 int edid_check_checksum(u8 *edid_block)
35 {
36         u8 checksum = 0;
37         int i;
38
39         for (i = 0; i < 128; i++)
40                 checksum += edid_block[i];
41
42         return (checksum == 0) ? 0 : -EINVAL;
43 }
44
45 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
46                     unsigned int *hmax, unsigned int *vmin,
47                     unsigned int *vmax)
48 {
49         int i;
50         struct edid_monitor_descriptor *monitor;
51
52         *hmin = *hmax = *vmin = *vmax = 0;
53         if (edid_check_info(edid))
54                 return -1;
55
56         for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
57                 monitor = &edid->monitor_details.descriptor[i];
58                 if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
59                         *hmin = monitor->data.range_data.horizontal_min;
60                         *hmax = monitor->data.range_data.horizontal_max;
61                         *vmin = monitor->data.range_data.vertical_min;
62                         *vmax = monitor->data.range_data.vertical_max;
63                         return 0;
64                 }
65         }
66         return -1;
67 }
68
69 /* Set all parts of a timing entry to the same value */
70 static void set_entry(struct timing_entry *entry, u32 value)
71 {
72         entry->min = value;
73         entry->typ = value;
74         entry->max = value;
75 }
76
77 /**
78  * decode_timing() - Decoding an 18-byte detailed timing record
79  *
80  * @buf:        Pointer to EDID detailed timing record
81  * @timing:     Place to put timing
82  */
83 static void decode_timing(u8 *buf, struct display_timing *timing)
84 {
85         uint x_mm, y_mm;
86         unsigned int ha, hbl, hso, hspw, hborder;
87         unsigned int va, vbl, vso, vspw, vborder;
88
89         /* Edid contains pixel clock in terms of 10KHz */
90         set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000);
91         x_mm = (buf[12] + ((buf[14] & 0xf0) << 4));
92         y_mm = (buf[13] + ((buf[14] & 0x0f) << 8));
93         ha = (buf[2] + ((buf[4] & 0xf0) << 4));
94         hbl = (buf[3] + ((buf[4] & 0x0f) << 8));
95         hso = (buf[8] + ((buf[11] & 0xc0) << 2));
96         hspw = (buf[9] + ((buf[11] & 0x30) << 4));
97         hborder = buf[15];
98         va = (buf[5] + ((buf[7] & 0xf0) << 4));
99         vbl = (buf[6] + ((buf[7] & 0x0f) << 8));
100         vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2));
101         vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4));
102         vborder = buf[16];
103
104         set_entry(&timing->hactive, ha);
105         set_entry(&timing->hfront_porch, hso);
106         set_entry(&timing->hback_porch, hbl - hso - hspw);
107         set_entry(&timing->hsync_len, hspw);
108
109         set_entry(&timing->vactive, va);
110         set_entry(&timing->vfront_porch, vso);
111         set_entry(&timing->vback_porch, vbl - vso - vspw);
112         set_entry(&timing->vsync_len, vspw);
113
114         debug("Detailed mode clock %u Hz, %d mm x %d mm\n"
115               "               %04x %04x %04x %04x hborder %x\n"
116               "               %04x %04x %04x %04x vborder %x\n",
117               timing->pixelclock.typ,
118               x_mm, y_mm,
119               ha, ha + hso, ha + hso + hspw,
120               ha + hbl, hborder,
121               va, va + vso, va + vso + vspw,
122               va + vbl, vborder);
123 }
124
125 int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
126                     int *panel_bits_per_colourp)
127 {
128         struct edid1_info *edid = (struct edid1_info *)buf;
129         bool timing_done;
130         int i;
131
132         if (buf_size < sizeof(*edid) || edid_check_info(edid)) {
133                 debug("%s: Invalid buffer\n", __func__);
134                 return -EINVAL;
135         }
136
137         if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) {
138                 debug("%s: No preferred timing\n", __func__);
139                 return -ENOENT;
140         }
141
142         /* Look for detailed timing */
143         timing_done = false;
144         for (i = 0; i < 4; i++) {
145                 struct edid_monitor_descriptor *desc;
146
147                 desc = &edid->monitor_details.descriptor[i];
148                 if (desc->zero_flag_1 != 0) {
149                         decode_timing((u8 *)desc, timing);
150                         timing_done = true;
151                         break;
152                 }
153         }
154         if (!timing_done)
155                 return -EINVAL;
156
157         if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) {
158                 debug("%s: Not a digital display\n", __func__);
159                 return -ENOSYS;
160         }
161         if (edid->version != 1 || edid->revision < 4) {
162                 debug("%s: EDID version %d.%d does not have required info\n",
163                       __func__, edid->version, edid->revision);
164                 *panel_bits_per_colourp = -1;
165         } else  {
166                 *panel_bits_per_colourp =
167                         ((edid->video_input_definition & 0x70) >> 3) + 4;
168         }
169
170         return 0;
171 }
172
173 /**
174  * Snip the tailing whitespace/return of a string.
175  *
176  * @param string        The string to be snipped
177  * @return the snipped string
178  */
179 static char *snip(char *string)
180 {
181         char *s;
182
183         /*
184          * This is always a 13 character buffer
185          * and it's not always terminated.
186          */
187         string[12] = '\0';
188         s = &string[strlen(string) - 1];
189
190         while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
191                         *s == '\0'))
192                 *(s--) = '\0';
193
194         return string;
195 }
196
197 /**
198  * Print an EDID monitor descriptor block
199  *
200  * @param monitor       The EDID monitor descriptor block
201  * @have_timing         Modifies to 1 if the desciptor contains timing info
202  */
203 static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
204                            unsigned int *have_timing)
205 {
206         unsigned char *bytes = (unsigned char *)monitor;
207         struct edid_detailed_timing *timing =
208                         (struct edid_detailed_timing *)monitor;
209
210         if (bytes[0] == 0 && bytes[1] == 0) {
211                 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
212                         printf("Monitor serial number: %s\n",
213                                snip(monitor->data.string));
214                 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
215                         printf("Monitor ID: %s\n",
216                                snip(monitor->data.string));
217                 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
218                         printf("Monitor name: %s\n",
219                                snip(monitor->data.string));
220                 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
221                         printf("Monitor range limits, horizontal sync: "
222                                "%d-%d kHz, vertical refresh: "
223                                "%d-%d Hz, max pixel clock: "
224                                "%d MHz\n",
225                                monitor->data.range_data.horizontal_min,
226                                monitor->data.range_data.horizontal_max,
227                                monitor->data.range_data.vertical_min,
228                                monitor->data.range_data.vertical_max,
229                                monitor->data.range_data.pixel_clock_max * 10);
230         } else {
231                 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
232                 uint32_t h_total, v_total, vfreq;
233
234                 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
235                 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
236                 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
237                 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
238                 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
239
240                 h_total = h_active + h_blanking;
241                 v_total = v_active + v_blanking;
242                 if (v_total * h_total)
243                         vfreq = pixclock / (v_total * h_total);
244                 else
245                         vfreq = 1; /* Error case */
246                 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
247                        v_active, h_active > 1000 ? ' ' : '\t', vfreq);
248                 *have_timing = 1;
249         }
250 }
251
252 /**
253  * Get the manufacturer name from an EDID info.
254  *
255  * @param edid_info     The EDID info to be printed
256  * @param name          Returns the string of the manufacturer name
257  */
258 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
259 {
260         name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
261         name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
262         name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
263         name[3] = '\0';
264 }
265
266 void edid_print_info(struct edid1_info *edid_info)
267 {
268         int i;
269         char manufacturer[4];
270         unsigned int have_timing = 0;
271         uint32_t serial_number;
272
273         if (edid_check_info(edid_info)) {
274                 printf("Not a valid EDID\n");
275                 return;
276         }
277
278         printf("EDID version: %d.%d\n",
279                edid_info->version, edid_info->revision);
280
281         printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
282
283         edid_get_manufacturer_name(edid_info, manufacturer);
284         printf("Manufacturer: %s\n", manufacturer);
285
286         serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
287         if (serial_number != 0xffffffff) {
288                 if (strcmp(manufacturer, "MAG") == 0)
289                         serial_number -= 0x7000000;
290                 if (strcmp(manufacturer, "OQI") == 0)
291                         serial_number -= 456150000;
292                 if (strcmp(manufacturer, "VSC") == 0)
293                         serial_number -= 640000000;
294         }
295         printf("Serial number: %08x\n", serial_number);
296         printf("Manufactured in week: %d year: %d\n",
297                edid_info->week, edid_info->year + 1990);
298
299         printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
300                EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
301                "digital signal, " : "analog signal, ",
302                EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
303                EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
304                ", blank to black" : "",
305                EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
306                ", separate sync" : "",
307                EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
308                ", composite sync" : "",
309                EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
310                ", sync on green" : "",
311                EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
312                ", serration v" : "");
313
314         printf("Monitor is %s\n",
315                EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
316
317         printf("Maximum visible display size: %d cm x %d cm\n",
318                edid_info->max_size_horizontal,
319                edid_info->max_size_vertical);
320
321         printf("Power management features: %s%s, %s%s, %s%s\n",
322                EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
323                "" : "no ", "active off",
324                EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
325                EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
326
327         printf("Estabilished timings:\n");
328         if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
329                 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
330         if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
331                 printf("\t720x400\t\t88 Hz (XGA2)\n");
332         if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
333                 printf("\t640x480\t\t60 Hz (VGA)\n");
334         if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
335                 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
336         if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
337                 printf("\t640x480\t\t72 Hz (VESA)\n");
338         if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
339                 printf("\t640x480\t\t75 Hz (VESA)\n");
340         if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
341                 printf("\t800x600\t\t56 Hz (VESA)\n");
342         if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
343                 printf("\t800x600\t\t60 Hz (VESA)\n");
344         if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
345                 printf("\t800x600\t\t72 Hz (VESA)\n");
346         if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
347                 printf("\t800x600\t\t75 Hz (VESA)\n");
348         if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
349                 printf("\t832x624\t\t75 Hz (Mac II)\n");
350         if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
351                 printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
352         if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
353                 printf("\t1024x768\t60 Hz (VESA)\n");
354         if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
355                 printf("\t1024x768\t70 Hz (VESA)\n");
356         if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
357                 printf("\t1024x768\t75 Hz (VESA)\n");
358         if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
359                 printf("\t1280x1024\t75 (VESA)\n");
360         if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
361                 printf("\t1152x870\t75 (Mac II)\n");
362
363         /* Standard timings. */
364         printf("Standard timings:\n");
365         for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
366                 unsigned int aspect = 10000;
367                 unsigned int x, y;
368                 unsigned char xres, vfreq;
369
370                 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
371                 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
372                 if ((xres != vfreq) ||
373                     ((xres != 0) && (xres != 1)) ||
374                     ((vfreq != 0) && (vfreq != 1))) {
375                         switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
376                                         i)) {
377                         case ASPECT_625:
378                                 aspect = 6250;
379                                 break;
380                         case ASPECT_75:
381                                 aspect = 7500;
382                                 break;
383                         case ASPECT_8:
384                                 aspect = 8000;
385                                 break;
386                         case ASPECT_5625:
387                                 aspect = 5625;
388                                 break;
389                         }
390                         x = (xres + 31) * 8;
391                         y = x * aspect / 10000;
392                         printf("\t%dx%d%c\t%d Hz\n", x, y,
393                                x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
394                         have_timing = 1;
395                 }
396         }
397
398         /* Detailed timing information. */
399         for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
400                         i++) {
401                 edid_print_dtd(&edid_info->monitor_details.descriptor[i],
402                                &have_timing);
403         }
404
405         if (!have_timing)
406                 printf("\tNone\n");
407 }