1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2012 The Chromium OS Authors.
4 *
5 * (C) Copyright 2010
6 * Petr Stetiar <ynezz@true.cz>
7 *
8 * Contains stolen code from ddcprobe project which is:
9 * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
10 */
11
12 #include <edid.h>
13 #include <errno.h>
14 #include <fdtdec.h>
15 #include <log.h>
16 #include <linux/ctype.h>
17 #include <linux/string.h>
18
19 #if CONFIG_IS_ENABLED(I2C_EDID_STANDARD)
20 #define TIMING(c, ha, hfp, hbp, hsl, va, vfp, vbp, vsl, f) \
21 .pixelclock = { (c), (c), (c) }, \
22 .hactive = { (ha), (ha), (ha) }, \
23 .hfront_porch = { (hfp), (hfp), (hfp) }, \
24 .hback_porch = { (hbp), (hbp), (hbp) }, \
25 .hsync_len = { (hsl), (hsl), (hsl) }, \
26 .vactive = { (va), (va), (va) }, \
27 .vfront_porch = { (vfp), (vfp), (vfp) }, \
28 .vback_porch = { (vbp), (vbp), (vbp) }, \
29 .vsync_len = { (vsl), (vsl), (vsl) }, \
30 .flags = (f)
31
32 static const struct display_timing dmt_timings[] = {
33 { TIMING(31500000, 640, 32, 64, 96, 350, 32, 3, 60,
34 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
35 { TIMING(31500000, 640, 32, 64, 96, 400, 1, 3, 41,
36 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
37 { TIMING(35500000, 720, 36, 72, 108, 400, 1, 3, 42,
38 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
39 { TIMING(25175000, 640, 16, 96, 48, 480, 10, 2, 33,
40 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
41 { TIMING(31500000, 640, 24, 40, 128, 480, 9, 3, 28,
42 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
43 { TIMING(31500000, 640, 16, 64, 120, 480, 1, 3, 16,
44 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
45 { TIMING(36000000, 640, 56, 56, 80, 480, 1, 3, 25,
46 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
47 { TIMING(36000000, 800, 24, 72, 128, 600, 1, 2, 22,
48 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
49 { TIMING(40000000, 800, 40, 128, 88, 600, 1, 4, 23,
50 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
51 { TIMING(50000000, 800, 56, 120, 64, 600, 37, 6, 23,
52 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
53 { TIMING(49500000, 800, 16, 80, 160, 600, 1, 3, 21,
54 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
55 { TIMING(56250000, 800, 32, 64, 152, 600, 1, 3, 27,
56 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
57 { TIMING(73250000, 800, 48, 32, 80, 600, 3, 4, 29,
58 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
59 { TIMING(33750000, 848, 16, 112, 112, 480, 6, 8, 23,
60 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
61 { TIMING(44900000, 1024, 8, 176, 56, 768, 0, 8, 41,
62 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
63 { TIMING(65000000, 1024, 24, 136, 160, 768, 3, 6, 29,
64 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
65 { TIMING(75000000, 1024, 24, 136, 144, 768, 3, 6, 29,
66 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
67 { TIMING(78750000, 1024, 16, 96, 176, 768, 1, 3, 28,
68 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
69 { TIMING(94500000, 1024, 48, 96, 208, 768, 1, 3, 36,
70 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
71 { TIMING(115500000, 1024, 48, 32, 80, 768, 3, 4, 38,
72 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
73 { TIMING(108000000, 1152, 64, 128, 256, 864, 1, 3, 32,
74 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
75 { TIMING(74250000, 1280, 110, 40, 220, 720, 5, 5, 20,
76 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
77 { TIMING(68250000, 1280, 48, 32, 80, 768, 3, 7, 12,
78 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
79 { TIMING(79500000, 1280, 64, 128, 192, 768, 3, 7, 20,
80 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
81 { TIMING(102250000, 1280, 80, 128, 208, 768, 3, 7, 27,
82 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
83 { TIMING(117500000, 1280, 80, 136, 216, 768, 3, 7, 31,
84 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
85 { TIMING(140250000, 1280, 48, 32, 80, 768, 3, 7, 35,
86 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
87 { TIMING(71000000, 1280, 48, 32, 80, 800, 3, 6, 14,
88 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
89 { TIMING(83500000, 1280, 72, 128, 200, 800, 3, 6, 22,
90 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
91 { TIMING(106500000, 1280, 80, 128, 208, 800, 3, 6, 29,
92 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
93 { TIMING(122500000, 1280, 80, 136, 216, 800, 3, 6, 34,
94 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
95 { TIMING(146250000, 1280, 48, 32, 80, 800, 3, 6, 38,
96 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
97 { TIMING(108000000, 1280, 96, 112, 312, 960, 1, 3, 36,
98 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
99 { TIMING(148500000, 1280, 64, 160, 224, 960, 1, 3, 47,
100 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
101 { TIMING(175500000, 1280, 48, 32, 80, 960, 3, 4, 50,
102 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
103 { TIMING(108000000, 1280, 48, 112, 248, 1024, 1, 3, 38,
104 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
105 { TIMING(135000000, 1280, 16, 144, 248, 1024, 1, 3, 38,
106 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
107 { TIMING(157500000, 1280, 64, 160, 224, 1024, 1, 3, 44,
108 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
109 { TIMING(187250000, 1280, 48, 32, 80, 1024, 3, 7, 50,
110 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
111 { TIMING(85500000, 1360, 64, 112, 256, 768, 3, 6, 18,
112 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
113 { TIMING(148250000, 1360, 48, 32, 80, 768, 3, 5, 37,
114 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
115 { TIMING(85500000, 1366, 70, 143, 213, 768, 3, 3, 24,
116 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
117 { TIMING(72000000, 1366, 14, 56, 64, 768, 1, 3, 28,
118 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
119 { TIMING(101000000, 1400, 48, 32, 80, 1050, 3, 4, 23,
120 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
121 { TIMING(121750000, 1400, 88, 144, 232, 1050, 3, 4, 32,
122 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
123 { TIMING(156000000, 1400, 104, 144, 248, 1050, 3, 4, 42,
124 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
125 { TIMING(179500000, 1400, 104, 152, 256, 1050, 3, 4, 48,
126 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
127 { TIMING(208000000, 1400, 48, 32, 80, 1050, 3, 4, 55,
128 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
129 { TIMING(88750000, 1440, 48, 32, 80, 900, 3, 6, 17,
130 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
131 { TIMING(106500000, 1440, 80, 152, 232, 900, 3, 6, 25,
132 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
133 { TIMING(136750000, 1440, 96, 152, 248, 900, 3, 6, 33,
134 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
135 { TIMING(157000000, 1440, 104, 152, 256, 900, 3, 6, 39,
136 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
137 { TIMING(182750000, 1440, 48, 32, 80, 900, 3, 6, 44,
138 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
139 { TIMING(108000000, 1600, 24, 80, 96, 900, 1, 3, 96,
140 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
141 { TIMING(162000000, 1600, 64, 192, 304, 1200, 1, 3, 46,
142 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
143 { TIMING(175500000, 1600, 64, 192, 304, 1200, 1, 3, 46,
144 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
145 { TIMING(189000000, 1600, 64, 192, 304, 1200, 1, 3, 46,
146 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
147 { TIMING(202500000, 1600, 64, 192, 304, 1200, 1, 3, 46,
148 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
149 { TIMING(229500000, 1600, 64, 192, 304, 1200, 1, 3, 46,
150 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
151 { TIMING(268250000, 1600, 48, 32, 80, 1200, 3, 4, 64,
152 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
153 { TIMING(119000000, 1680, 48, 32, 80, 1050, 3, 6, 21,
154 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
155 { TIMING(146250000, 1680, 104, 176, 280, 1050, 3, 6, 30,
156 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
157 { TIMING(187000000, 1680, 120, 176, 296, 1050, 3, 6, 40,
158 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
159 { TIMING(214750000, 1680, 128, 176, 304, 1050, 3, 6, 46,
160 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
161 { TIMING(245500000, 1680, 48, 32, 80, 1050, 3, 6, 53,
162 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
163 { TIMING(204750000, 1792, 128, 200, 328, 1344, 1, 3, 46,
164 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
165 { TIMING(261000000, 1792, 96, 216, 352, 1344, 1, 3, 69,
166 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
167 { TIMING(333250000, 1792, 48, 32, 80, 1344, 3, 4, 72,
168 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
169 { TIMING(218250000, 1856, 96, 224, 352, 1392, 1, 3, 43,
170 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
171 { TIMING(288000000, 1856, 128, 224, 352, 1392, 1, 3, 104,
172 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
173 { TIMING(356500000, 1856, 48, 32, 80, 1392, 3, 4, 75,
174 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
175 { TIMING(148500000, 1920, 88, 44, 148, 1080, 4, 5, 36,
176 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW) },
177 { TIMING(154000000, 1920, 48, 32, 80, 1200, 3, 6, 26,
178 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
179 { TIMING(193250000, 1920, 136, 200, 336, 1200, 3, 6, 36,
180 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
181 { TIMING(245250000, 1920, 136, 208, 344, 1200, 3, 6, 46,
182 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
183 { TIMING(281250000, 1920, 144, 208, 352, 1200, 3, 6, 53,
184 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
185 { TIMING(317000000, 1920, 48, 32, 80, 1200, 3, 6, 62,
186 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
187 { TIMING(234000000, 1920, 128, 208, 344, 1440, 1, 3, 56,
188 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
189 { TIMING(297000000, 1920, 144, 224, 352, 1440, 1, 3, 56,
190 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
191 { TIMING(380500000, 1920, 48, 32, 80, 1440, 3, 4, 78,
192 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
193 { TIMING(162000000, 2048, 26, 80, 96, 1152, 1, 3, 44,
194 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_HIGH) },
195 { TIMING(268500000, 2560, 48, 32, 80, 1600, 3, 6, 37,
196 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
197 { TIMING(348500000, 2560, 192, 280, 472, 1600, 3, 6, 49,
198 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
199 { TIMING(443250000, 2560, 208, 280, 488, 1600, 3, 6, 63,
200 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
201 { TIMING(505250000, 2560, 208, 280, 488, 1600, 3, 6, 73,
202 DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_HIGH) },
203 { TIMING(552750000, 2560, 48, 32, 80, 1600, 3, 6, 85,
204 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
205 { TIMING(556744000, 4096, 8, 32, 40, 2160, 48, 8, 6,
206 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
207 { TIMING(556188000, 4096, 8, 32, 40, 2160, 48, 8, 6,
208 DISPLAY_FLAGS_HSYNC_HIGH | DISPLAY_FLAGS_VSYNC_LOW) },
209 };
210 #endif
211
edid_check_info(struct edid1_info * edid_info)212 int edid_check_info(struct edid1_info *edid_info)
213 {
214 if ((edid_info == NULL) || (edid_info->version == 0))
215 return -1;
216
217 if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
218 return -1;
219
220 if (edid_info->version == 0xff && edid_info->revision == 0xff)
221 return -1;
222
223 return 0;
224 }
225
edid_check_checksum(u8 * edid_block)226 int edid_check_checksum(u8 *edid_block)
227 {
228 u8 checksum = 0;
229 int i;
230
231 for (i = 0; i < 128; i++)
232 checksum += edid_block[i];
233
234 return (checksum == 0) ? 0 : -EINVAL;
235 }
236
edid_get_ranges(struct edid1_info * edid,unsigned int * hmin,unsigned int * hmax,unsigned int * vmin,unsigned int * vmax)237 int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
238 unsigned int *hmax, unsigned int *vmin,
239 unsigned int *vmax)
240 {
241 int i;
242 struct edid_monitor_descriptor *monitor;
243
244 *hmin = *hmax = *vmin = *vmax = 0;
245 if (edid_check_info(edid))
246 return -1;
247
248 for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
249 monitor = &edid->monitor_details.descriptor[i];
250 if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
251 *hmin = monitor->data.range_data.horizontal_min;
252 *hmax = monitor->data.range_data.horizontal_max;
253 *vmin = monitor->data.range_data.vertical_min;
254 *vmax = monitor->data.range_data.vertical_max;
255 return 0;
256 }
257 }
258 return -1;
259 }
260
261 /* Set all parts of a timing entry to the same value */
set_entry(struct timing_entry * entry,u32 value)262 static void set_entry(struct timing_entry *entry, u32 value)
263 {
264 entry->min = value;
265 entry->typ = value;
266 entry->max = value;
267 }
268
269 /**
270 * decode_timing() - Decoding an 18-byte detailed timing record
271 *
272 * @buf: Pointer to EDID detailed timing record
273 * @timing: Place to put timing
274 */
decode_timing(u8 * buf,struct display_timing * timing)275 static void decode_timing(u8 *buf, struct display_timing *timing)
276 {
277 uint x_mm, y_mm;
278 unsigned int ha, hbl, hso, hspw, hborder;
279 unsigned int va, vbl, vso, vspw, vborder;
280 struct edid_detailed_timing *t = (struct edid_detailed_timing *)buf;
281
282 /* Edid contains pixel clock in terms of 10KHz */
283 set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000);
284 x_mm = (buf[12] + ((buf[14] & 0xf0) << 4));
285 y_mm = (buf[13] + ((buf[14] & 0x0f) << 8));
286 ha = (buf[2] + ((buf[4] & 0xf0) << 4));
287 hbl = (buf[3] + ((buf[4] & 0x0f) << 8));
288 hso = (buf[8] + ((buf[11] & 0xc0) << 2));
289 hspw = (buf[9] + ((buf[11] & 0x30) << 4));
290 hborder = buf[15];
291 va = (buf[5] + ((buf[7] & 0xf0) << 4));
292 vbl = (buf[6] + ((buf[7] & 0x0f) << 8));
293 vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2));
294 vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4));
295 vborder = buf[16];
296
297 set_entry(&timing->hactive, ha);
298 set_entry(&timing->hfront_porch, hso);
299 set_entry(&timing->hback_porch, hbl - hso - hspw);
300 set_entry(&timing->hsync_len, hspw);
301
302 set_entry(&timing->vactive, va);
303 set_entry(&timing->vfront_porch, vso);
304 set_entry(&timing->vback_porch, vbl - vso - vspw);
305 set_entry(&timing->vsync_len, vspw);
306
307 timing->flags = 0;
308 if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t))
309 timing->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
310 else
311 timing->flags |= DISPLAY_FLAGS_HSYNC_LOW;
312 if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t))
313 timing->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
314 else
315 timing->flags |= DISPLAY_FLAGS_VSYNC_LOW;
316
317 if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t))
318 timing->flags = DISPLAY_FLAGS_INTERLACED;
319
320 debug("Detailed mode clock %u Hz, %d mm x %d mm\n"
321 " %04x %04x %04x %04x hborder %x\n"
322 " %04x %04x %04x %04x vborder %x\n",
323 timing->pixelclock.typ,
324 x_mm, y_mm,
325 ha, ha + hso, ha + hso + hspw,
326 ha + hbl, hborder,
327 va, va + vso, va + vso + vspw,
328 va + vbl, vborder);
329 }
330
331 /**
332 * Check if HDMI vendor specific data block is present in CEA block
333 * @param info CEA extension block
334 * Return: true if block is found
335 */
cea_is_hdmi_vsdb_present(struct edid_cea861_info * info)336 static bool cea_is_hdmi_vsdb_present(struct edid_cea861_info *info)
337 {
338 u8 end, i = 0;
339
340 /* check for end of data block */
341 end = info->dtd_offset;
342 if (end == 0)
343 end = sizeof(info->data);
344 if (end < 4 || end > sizeof(info->data))
345 return false;
346 end -= 4;
347
348 while (i < end) {
349 /* Look for vendor specific data block of appropriate size */
350 if ((EDID_CEA861_DB_TYPE(*info, i) == EDID_CEA861_DB_VENDOR) &&
351 (EDID_CEA861_DB_LEN(*info, i) >= 5)) {
352 u8 *db = &info->data[i + 1];
353 u32 oui = db[0] | (db[1] << 8) | (db[2] << 16);
354
355 if (oui == HDMI_IEEE_OUI)
356 return true;
357 }
358 i += EDID_CEA861_DB_LEN(*info, i) + 1;
359 }
360
361 return false;
362 }
363
edid_find_valid_detailed_timing(void * buf,int count,struct display_timing * timing,bool (* mode_valid)(void * priv,const struct display_timing * timing),void * mode_valid_priv)364 static bool edid_find_valid_detailed_timing(void *buf, int count,
365 struct display_timing *timing,
366 bool (*mode_valid)(void *priv,
367 const struct display_timing *timing),
368 void *mode_valid_priv)
369 {
370 struct edid_detailed_timing *t = buf;
371 bool found = false;
372 int i;
373
374 for (i = 0; i < count && !found; i++, t++)
375 if (EDID_DETAILED_TIMING_PIXEL_CLOCK(*t) != 0) {
376 decode_timing((u8 *)t, timing);
377 if (mode_valid)
378 found = mode_valid(mode_valid_priv,
379 timing);
380 else
381 found = true;
382 }
383
384 return found;
385 }
386
edid_get_standard_timing(struct edid1_info * edid,int i,unsigned int * x,unsigned int * y,unsigned int * freq)387 static bool edid_get_standard_timing(struct edid1_info *edid, int i, unsigned int *x,
388 unsigned int *y, unsigned int *freq)
389 {
390 unsigned int aspect = 10000;
391 unsigned char xres, vfreq;
392
393 xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid, i);
394 vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid, i);
395 if (xres != vfreq || (xres != 0 && xres != 1) ||
396 (vfreq != 0 && vfreq != 1)) {
397 switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid, i)) {
398 case ASPECT_625: // 16:10
399 aspect = 6250;
400 break;
401 case ASPECT_75: // 4:3
402 aspect = 7500;
403 break;
404 case ASPECT_8: // 5:4
405 aspect = 8000;
406 break;
407 case ASPECT_5625: // 16:9
408 aspect = 5625;
409 break;
410 }
411
412 *x = (xres + 31) * 8;
413 *y = *x * aspect / 10000;
414 *freq = (vfreq & 0x3f) + 60;
415
416 return true;
417 }
418
419 return false;
420 }
421
422 #if CONFIG_IS_ENABLED(I2C_EDID_STANDARD)
edid_find_valid_standard_timing(struct edid1_info * buf,struct display_timing * timing,bool (* mode_valid)(void * priv,const struct display_timing * timing),void * mode_valid_priv)423 static bool edid_find_valid_standard_timing(struct edid1_info *buf,
424 struct display_timing *timing,
425 bool (*mode_valid)(void *priv,
426 const struct display_timing *timing),
427 void *mode_valid_priv)
428 {
429 unsigned int x, y, freq;
430 bool found = false;
431 int i, k;
432
433 for (i = 0; i < ARRAY_SIZE(buf->standard_timings); i++) {
434 if (!edid_get_standard_timing(buf, i, &x, &y, &freq))
435 continue;
436
437 for (k = 0; k < ARRAY_SIZE(dmt_timings); k++) {
438 const struct display_timing *dt = &dmt_timings[k];
439
440 if (dt->hactive.typ == x && dt->vactive.typ == y) {
441 found = mode_valid(mode_valid_priv, dt);
442 if (found) {
443 memcpy(timing, dt, sizeof(*timing));
444 return true;
445 }
446 }
447 }
448 }
449
450 return found;
451 }
452 #endif
453
edid_get_timing_validate(u8 * buf,int buf_size,struct display_timing * timing,int * panel_bits_per_colourp,bool (* mode_valid)(void * priv,const struct display_timing * timing),void * mode_valid_priv)454 int edid_get_timing_validate(u8 *buf, int buf_size,
455 struct display_timing *timing,
456 int *panel_bits_per_colourp,
457 bool (*mode_valid)(void *priv,
458 const struct display_timing *timing),
459 void *mode_valid_priv)
460 {
461 struct edid1_info *edid = (struct edid1_info *)buf;
462 bool found;
463
464 if (buf_size < sizeof(*edid) || edid_check_info(edid)) {
465 debug("%s: Invalid buffer\n", __func__);
466 return -EINVAL;
467 }
468
469 if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) {
470 debug("%s: Not a digital display\n", __func__);
471 return -ENOSYS;
472 }
473
474 if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) {
475 debug("%s: No preferred timing\n", __func__);
476 return -ENOENT;
477 }
478
479 /* Look for detailed timing in base EDID */
480 found = edid_find_valid_detailed_timing(edid->monitor_details.descriptor, 4,
481 timing, mode_valid, mode_valid_priv);
482
483 /* Look for detailed timing in CTA-861 Extension Block */
484 if (!found && edid->extension_flag && buf_size >= EDID_EXT_SIZE) {
485 struct edid_cea861_info *info =
486 (struct edid_cea861_info *)(buf + sizeof(*edid));
487
488 if (info->extension_tag == EDID_CEA861_EXTENSION_TAG) {
489 int count = EDID_CEA861_DTD_COUNT(*info);
490 int offset = info->dtd_offset;
491 int size = count * sizeof(struct edid_detailed_timing);
492
493 if (offset >= 4 && offset + size < EDID_SIZE)
494 found = edid_find_valid_detailed_timing(
495 (u8 *)info + offset, count, timing,
496 mode_valid, mode_valid_priv);
497 }
498 }
499
500 #if CONFIG_IS_ENABLED(I2C_EDID_STANDARD)
501 /* Look for timing in Standard Timings */
502 if (!found)
503 found = edid_find_valid_standard_timing(edid, timing, mode_valid,
504 mode_valid_priv);
505 #endif
506
507 if (!found)
508 return -EINVAL;
509
510 if (edid->version != 1 || edid->revision < 4) {
511 debug("%s: EDID version %d.%d does not have required info\n",
512 __func__, edid->version, edid->revision);
513 *panel_bits_per_colourp = -1;
514 } else {
515 *panel_bits_per_colourp =
516 ((edid->video_input_definition & 0x70) >> 3) + 4;
517 }
518
519 timing->hdmi_monitor = false;
520 if (edid->extension_flag && (buf_size >= EDID_EXT_SIZE)) {
521 struct edid_cea861_info *info =
522 (struct edid_cea861_info *)(buf + sizeof(*edid));
523
524 if (info->extension_tag == EDID_CEA861_EXTENSION_TAG)
525 timing->hdmi_monitor = cea_is_hdmi_vsdb_present(info);
526 }
527
528 return 0;
529 }
530
edid_get_timing(u8 * buf,int buf_size,struct display_timing * timing,int * panel_bits_per_colourp)531 int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
532 int *panel_bits_per_colourp)
533 {
534 return edid_get_timing_validate(buf, buf_size, timing,
535 panel_bits_per_colourp, NULL, NULL);
536 }
537
538 /**
539 * Snip the tailing whitespace/return of a string.
540 *
541 * @param string The string to be snipped
542 * Return: the snipped string
543 */
snip(char * string)544 static char *snip(char *string)
545 {
546 char *s;
547
548 /*
549 * This is always a 13 character buffer
550 * and it's not always terminated.
551 */
552 string[12] = '\0';
553 s = &string[strlen(string) - 1];
554
555 while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
556 *s == '\0'))
557 *(s--) = '\0';
558
559 return string;
560 }
561
562 /**
563 * Print an EDID monitor descriptor block
564 *
565 * @param monitor The EDID monitor descriptor block
566 * @have_timing Modifies to 1 if the desciptor contains timing info
567 */
edid_print_dtd(struct edid_monitor_descriptor * monitor,unsigned int * have_timing)568 static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
569 unsigned int *have_timing)
570 {
571 unsigned char *bytes = (unsigned char *)monitor;
572 struct edid_detailed_timing *timing =
573 (struct edid_detailed_timing *)monitor;
574
575 if (bytes[0] == 0 && bytes[1] == 0) {
576 if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
577 printf("Monitor serial number: %s\n",
578 snip(monitor->data.string));
579 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
580 printf("Monitor ID: %s\n",
581 snip(monitor->data.string));
582 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
583 printf("Monitor name: %s\n",
584 snip(monitor->data.string));
585 else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
586 printf("Monitor range limits, horizontal sync: "
587 "%d-%d kHz, vertical refresh: "
588 "%d-%d Hz, max pixel clock: "
589 "%d MHz\n",
590 monitor->data.range_data.horizontal_min,
591 monitor->data.range_data.horizontal_max,
592 monitor->data.range_data.vertical_min,
593 monitor->data.range_data.vertical_max,
594 monitor->data.range_data.pixel_clock_max * 10);
595 } else {
596 uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
597 uint32_t h_total, v_total, vfreq;
598
599 pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
600 h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
601 h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
602 v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
603 v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
604
605 h_total = h_active + h_blanking;
606 v_total = v_active + v_blanking;
607 if (v_total > 0 && h_total > 0)
608 vfreq = pixclock / (v_total * h_total);
609 else
610 vfreq = 1; /* Error case */
611 printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
612 v_active, h_active > 1000 ? ' ' : '\t', vfreq);
613 *have_timing = 1;
614 }
615 }
616
617 /**
618 * Get the manufacturer name from an EDID info.
619 *
620 * @param edid_info The EDID info to be printed
621 * @param name Returns the string of the manufacturer name
622 */
edid_get_manufacturer_name(struct edid1_info * edid,char * name)623 static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
624 {
625 name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
626 name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
627 name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
628 name[3] = '\0';
629 }
630
edid_print_info(struct edid1_info * edid_info)631 void edid_print_info(struct edid1_info *edid_info)
632 {
633 int i;
634 char manufacturer[4];
635 unsigned int have_timing = 0;
636 uint32_t serial_number;
637
638 if (edid_check_info(edid_info)) {
639 printf("Not a valid EDID\n");
640 return;
641 }
642
643 printf("EDID version: %d.%d\n",
644 edid_info->version, edid_info->revision);
645
646 printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
647
648 edid_get_manufacturer_name(edid_info, manufacturer);
649 printf("Manufacturer: %s\n", manufacturer);
650
651 serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
652 if (serial_number != 0xffffffff) {
653 if (strcmp(manufacturer, "MAG") == 0)
654 serial_number -= 0x7000000;
655 if (strcmp(manufacturer, "OQI") == 0)
656 serial_number -= 456150000;
657 if (strcmp(manufacturer, "VSC") == 0)
658 serial_number -= 640000000;
659 }
660 printf("Serial number: %08x\n", serial_number);
661 printf("Manufactured in week: %d year: %d\n",
662 edid_info->week, edid_info->year + 1990);
663
664 printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
665 EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
666 "digital signal, " : "analog signal, ",
667 EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
668 EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
669 ", blank to black" : "",
670 EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
671 ", separate sync" : "",
672 EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
673 ", composite sync" : "",
674 EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
675 ", sync on green" : "",
676 EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
677 ", serration v" : "");
678
679 printf("Monitor is %s\n",
680 EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
681
682 printf("Maximum visible display size: %d cm x %d cm\n",
683 edid_info->max_size_horizontal,
684 edid_info->max_size_vertical);
685
686 printf("Power management features: %s%s, %s%s, %s%s\n",
687 EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
688 "" : "no ", "active off",
689 EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
690 EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
691
692 printf("Estabilished timings:\n");
693 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
694 printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
695 if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
696 printf("\t720x400\t\t88 Hz (XGA2)\n");
697 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
698 printf("\t640x480\t\t60 Hz (VGA)\n");
699 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
700 printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
701 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
702 printf("\t640x480\t\t72 Hz (VESA)\n");
703 if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
704 printf("\t640x480\t\t75 Hz (VESA)\n");
705 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
706 printf("\t800x600\t\t56 Hz (VESA)\n");
707 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
708 printf("\t800x600\t\t60 Hz (VESA)\n");
709 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
710 printf("\t800x600\t\t72 Hz (VESA)\n");
711 if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
712 printf("\t800x600\t\t75 Hz (VESA)\n");
713 if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
714 printf("\t832x624\t\t75 Hz (Mac II)\n");
715 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
716 printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
717 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
718 printf("\t1024x768\t60 Hz (VESA)\n");
719 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
720 printf("\t1024x768\t70 Hz (VESA)\n");
721 if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
722 printf("\t1024x768\t75 Hz (VESA)\n");
723 if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
724 printf("\t1280x1024\t75 (VESA)\n");
725 if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
726 printf("\t1152x870\t75 (Mac II)\n");
727
728 /* Standard timings. */
729 printf("Standard timings:\n");
730 for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
731 unsigned int x, y, freq;
732
733 if (edid_get_standard_timing(edid_info, i, &x, &y, &freq)) {
734 printf("\t%dx%d%c\t%d Hz\n", x, y,
735 x > 1000 ? ' ' : '\t', freq);
736 have_timing = 1;
737 }
738 }
739
740 /* Detailed timing information. */
741 for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
742 i++) {
743 edid_print_dtd(&edid_info->monitor_details.descriptor[i],
744 &have_timing);
745 }
746
747 if (!have_timing)
748 printf("\tNone\n");
749 }
750