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1/*␊
2 * edid.c␊
3 * ␊
4 *␊
5 * Created by Evan Lojewski on 12/1/09.␊
6 * Copyright 2009. All rights reserved.␊
7 * ␊
8 *␉Slice 2010␊
9 */␊
10␊
11␊
12//#include "libsaio.h"␊
13#include "edid.h"␊
14#include "vbe.h"␊
15#include "graphics.h"␊
16#include "boot.h"␊
17//----------------------------------------------------------------------------------␊
18␊
19#define FBMON_FIX_HEADER 1␊
20#define FBMON_FIX_INPUT 2␊
21#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))␊
22␊
23//----------------------------------------------------------------------------------␊
24/*␊
25struct broken_edid {␊
26␉const char manufacturer[4];␊
27␉UInt32 model;␊
28␉UInt32 fix;␊
29};␊
30␊
31//----------------------------------------------------------------------------------␊
32␊
33broken_edid brokendb[] = {␊
34␉// DEC FR-PCXAV-YZ *␊
35␉{ "DEC", 0x073a, FBMON_FIX_HEADER,},␊
36␉// ViewSonic PF775a *␊
37␉{ "VSC", 0x5a44, FBMON_FIX_INPUT,␉}␊
38};␊
39//----------------------------------------------------------------------------------␊
40*/␊
41const unsigned char edid_v1_header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00␉};␊
42␊
43//----------------------------------------------------------------------------------␊
44int edid_compare(unsigned char *edid1, unsigned char *edid2)␊
45{␊
46␉int result = 0;␊
47␉unsigned char *block = edid1 + ID_MANUFACTURER_NAME, manufacturer1[4], manufacturer2[4];;␊
48␉manufacturer1[0] = ((block[0] & 0x7c) >> 2) + '@';␊
49␉manufacturer1[1] = ((block[0] & 0x03) << 3) + ((block[1] & 0xe0) >> 5) + '@';␊
50␉manufacturer1[2] = (block[1] & 0x1f) + '@';␊
51␉manufacturer1[3] = 0;␊
52␉␊
53␉block = edid2 + ID_MANUFACTURER_NAME;␊
54␉manufacturer2[0] = ((block[0] & 0x7c) >> 2) + '@';␊
55␉manufacturer2[1] = ((block[0] & 0x03) << 3) + ((block[1] & 0xe0) >> 5) + '@';␊
56␉manufacturer2[2] = (block[1] & 0x1f) + '@';␊
57␉manufacturer2[3] = 0;␊
58␉int x;␊
59␉for(x = 0; x < 4; x++)␊
60␉{␊
61␉␉if(manufacturer1[x] == manufacturer2[x])␊
62␉␉␉result++;␊
63␉}␊
64␉␊
65␉return result;␊
66}␊
67␊
68int check_edid(unsigned char *edid)␊
69{␊
70␉unsigned char *block = edid + ID_MANUFACTURER_NAME, manufacturer[4];␊
71␉//unsigned char *b;␊
72␉UInt32 model;␊
73␉//int i, fix = 0, ret = 0;␊
74␉␊
75␉manufacturer[0] = ((block[0] & 0x7c) >> 2) + '@';␊
76␉manufacturer[1] = ((block[0] & 0x03) << 3) +␊
77␉((block[1] & 0xe0) >> 5) + '@';␊
78␉manufacturer[2] = (block[1] & 0x1f) + '@';␊
79␉manufacturer[3] = 0;␊
80␉model = block[2] + (block[3] << 8);␊
81/*␉␊
82␉for (i = 0; i < (int)ARRAY_SIZE(brokendb); i++) {␊
83␉␉if (!strncmp((const char *)manufacturer, brokendb[i].manufacturer, 4) &&␊
84␉␉␉brokendb[i].model == model) {␊
85␉␉␉DEBG("ATIFB: The EDID Block of "␊
86␉␉␉␉ "Manufacturer: %s Model: 0x%08lx is known to "␊
87␉␉␉␉ "be broken,\n", manufacturer, model);␊
88␉␉␉fix = brokendb[i].fix;␊
89␉␉␉break;␊
90␉␉}␊
91␉}␊
92␉␊
93␉switch (fix) {␊
94␉␉case FBMON_FIX_HEADER:␊
95␉␉␉for (i = 0; i < 8; i++) {␊
96␉␉␉␉if (edid[i] != edid_v1_header[i])␊
97␉␉␉␉␉ret = fix;␊
98␉␉␉}␊
99␉␉␉break;␊
100␉␉case FBMON_FIX_INPUT:␊
101␉␉␉b = edid + EDID_STRUCT_DISPLAY;␊
102␉␉␉/// Only if display is GTF capable will␊
103␉␉␉ //the input type be reset to analog *␊
104␉␉␉if (b[4] & 0x01 && b[0] & 0x80)␊
105␉␉␉␉ret = fix;␊
106␉␉␉break;␊
107␉}␊
108*/␉␊
109␉return 0; //ret;␊
110}␊
111␊
112//----------------------------------------------------------------------------------␊
113␊
114static void fix_edid(unsigned char *edid, int fix)␊
115{␊
116␉unsigned char *b;␊
117␉␊
118␉switch (fix) {␊
119␉␉case FBMON_FIX_HEADER:␊
120␉␉␉msglog("EDID: trying a header reconstruct\n");␊
121␉␉␉memcpy(edid, edid_v1_header, 8);␊
122␉␉␉break;␊
123␉␉case FBMON_FIX_INPUT:␊
124␉␉␉msglog("EDID: trying to fix input type\n");␊
125␉␉␉b = edid + EDID_STRUCT_DISPLAY;␊
126␉␉␉b[0] &= ~0x80;␊
127␉␉␉edid[127] += 0x80;␊
128␉}␊
129}␊
130␊
131//----------------------------------------------------------------------------------␊
132␊
133int edid_checksum(unsigned char *edid)␊
134{␊
135␉unsigned char i, csum = 0, all_null = 0;␊
136␉int err = 0, fix = check_edid(edid);␊
137␉␊
138␉if (fix)␊
139␉␉fix_edid(edid, fix);␊
140␉␊
141␉for (i = 0; i < EDID_LENGTH; i++) {␊
142␉␉csum += edid[i];␊
143␉␉all_null |= edid[i];␊
144␉}␊
145␉␊
146␉if (csum == 0x00 && all_null) {␊
147␉␉/* checksum passed, everything's good */␊
148␉␉err = 1;␊
149␉}␊
150␉␊
151␉return err;␊
152}␊
153␊
154//----------------------------------------------------------------------------------␊
155␊
156static int edid_check_header(unsigned char *edid)␊
157{␊
158␉int i, err = 1, fix = check_edid(edid);␊
159␉␊
160␉if (fix)␊
161␉␉fix_edid(edid, fix);␊
162␉␊
163␉for (i = 0; i < 8; i++) {␊
164␉␉if (edid[i] != edid_v1_header[i])␊
165␉␉␉err = 0;␊
166␉}␊
167␉␊
168␉return err;␊
169}␊
170//------------------------------------------------------------------------␊
171bool verifyEDID(unsigned char *edid)␊
172{␊
173␉if (edid == NULL || !edid_checksum(edid) ||␉!edid_check_header(edid)) ␊
174␉{␊
175␉␉return false;␊
176␉}␊
177␉return true;␊
178}␊
179␊
180int edid_is_timing_block(unsigned char *block)␊
181{␊
182␉if ((block[0] != 0x00) || (block[1] != 0x00) ||␊
183␉␉(block[2] != 0x00) || (block[4] != 0x00))␊
184␉␉return 1;␊
185␉else␊
186␉␉return 0;␊
187}␊
188//----------------------------------------------------------------------------------␊
189␊
190int fb_parse_edid(struct EDID *edid, UInt32* x, UInt32* y)␊
191{␊
192␉int i;␊
193␉unsigned char *block;␊
194␉␊
195␉if(!verifyEDID((unsigned char *)edid)) return 1;␊
196␉␊
197␉block = (unsigned char *)edid + DETAILED_TIMING_DESCRIPTIONS_START; //54␊
198␉␊
199␉for (i = 0; i < 4; i++, block += DETAILED_TIMING_DESCRIPTION_SIZE) {␊
200␉␉if (edid_is_timing_block(block)) {␊
201␉␉␉*x = H_ACTIVE;␊
202␉␉␉*y = V_ACTIVE;␊
203␉␉␉/*␊
204␉␉␉var->xres = var->xres_virtual = H_ACTIVE;␊
205␉␉␉var->yres = var->yres_virtual = V_ACTIVE;␊
206␉␉␉var->height = var->width = -1;␊
207␉␉␉var->right_margin = H_SYNC_OFFSET;␊
208␉␉␉var->left_margin = (H_ACTIVE + H_BLANKING) -␊
209␉␉␉(H_ACTIVE + H_SYNC_OFFSET + H_SYNC_WIDTH);␊
210␉␉␉var->upper_margin = V_BLANKING - V_SYNC_OFFSET -␊
211␉␉␉V_SYNC_WIDTH;␊
212␉␉␉var->lower_margin = V_SYNC_OFFSET;␊
213␉␉␉var->hsync_len = H_SYNC_WIDTH;␊
214␉␉␉var->vsync_len = V_SYNC_WIDTH;␊
215␉␉␉var->pixclock = PIXEL_CLOCK;␊
216␉␉␉var->pixclock /= 1000;␊
217␉␉␉var->pixclock = KHZ2PICOS(var->pixclock);␊
218␉␉␉␊
219␉␉␉if (HSYNC_POSITIVE)␊
220␉␉␉␉var->sync |= FB_SYNC_HOR_HIGH_ACT;␊
221␉␉␉if (VSYNC_POSITIVE)␊
222␉␉␉␉var->sync |= FB_SYNC_VERT_HIGH_ACT;␊
223␉␉␉ */␊
224␉␉␉return 0;␊
225␉␉}␊
226␉}␊
227␉return 1;␊
228}␊
229␊
230void getResolution(UInt32* x, UInt32* y, UInt32* bp)␊
231{␊
232␉int val;␊
233␉static UInt32 xResolution, yResolution, bpResolution;␊
234␊
235␉if(getIntForKey(kScreenWidth, &val, &bootInfo->bootConfig))␊
236␉{␊
237␉␉xResolution = val;␊
238␉}␊
239␉␊
240␉if(getIntForKey(kScreenHeight, &val, &bootInfo->bootConfig))␊
241␉{␊
242␉␉yResolution = val;␊
243␉}␊
244␊
245␉bpResolution = 32;␉// assume 32bits␊
246␊
247␉␊
248␉if(!xResolution || !yResolution || !bpResolution)␊
249␉{␊
250␉␉␊
251␉␉char* edidInfo = readEDID();␊
252␉␉␊
253␉␉if(!edidInfo) return;␊
254␉␉␊
255␉␉// TODO: check *all* resolutions reported and either use the highest, or the native resolution (if there is a flag for that)␊
256␉␉//xResolution = edidInfo[56] | ((edidInfo[58] & 0xF0) << 4); ␊
257␉␉//yResolution = edidInfo[59] | ((edidInfo[61] & 0xF0) << 4); ␊
258␉␉if(fb_parse_edid(edidInfo, &xResolution, &yResolution))␊
259␉␉{␊
260␉␉␉xResolution = DEFAULT_SCREEN_WIDTH;␊
261␉␉␉yResolution = DEFAULT_SCREEN_HEIGHT;␊
262␉␉}␊
263␉␉/*␊
264␉␉ 0x00 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0x00 0x32 0x0C␊
265␉␉ 0x00 0xDF 0x00 0x00 0x00 0x00 0xFF 0xFF 0xFF 0x00␊
266␉␉ 0x0C 0xDF 0x00 0x00 0x12 0x03 0x21 0x78 0xE9 0x99 ␊
267␉␉ 0x53 0x28 0xFF 0xFF 0x32 0xDF 0x00 0x12 0x80 0x78 ␊
268␉␉ 0xD5 0x53 0x26 0x00 0x01 0x01 0x01 0x01 0xFF 0x00 ␊
269␉␉ 0xDF 0x00 0x03 0x78 0x99 0x28 0x00 0x01 0x01 0x01 ␊
270␉␉ 0x01 0x21 0x84 0x20 0xFF 0x0C 0x00 0x03 0x0A 0x53 ␊
271␉␉ 0x54 0x01 0x01 0x01 0xDE 0x84 0x56 0x00 0xA0 0x30␊
272␉␉ 0xFF 0xDF 0x12 0x78 0x53 0x00 0x01 0x01 0x01 0x84 ␊
273␉␉ 0x00 0x18 0x84 0x00 0x00 0x57 0xFF 0x00 0x80 0x99␊
274␉␉ 0x54 0x01 0x01 0x21 0x20 0x00 0x50 0x00 0x00 0x35␊
275␉␉ 0x57 0xFE 0x00 0x00 0x78 0x28 0x01 0x01 0x21 0x20␊
276␉␉ 0x18 0x30 0x00 0x57 0x34 0xFE 0xAA 0x9A ␊
277␊
278␉␉ */␊
279␉␉␊
280␉␉//msglog("H Active = %d ", edidInfo[56] | ((edidInfo[58] & 0xF0) << 4) );␊
281␉␉//msglog("V Active = %d \n", edidInfo[59] | ((edidInfo[61] & 0xF0) << 4) );␊
282␉␉␊
283␉␉free( edidInfo );␊
284␉␉␊
285␉␉//if(!xResolution) xResolution = DEFAULT_SCREEN_WIDTH;␊
286␉␉//if(!yResolution) yResolution = DEFAULT_SCREEN_HEIGHT;␊
287␊
288␉}␊
289␊
290␉*x = xResolution;␊
291␉*y = yResolution;␊
292␉*bp = bpResolution;␊
293␊
294}␊
295␊
296char* readEDID()␊
297{␊
298␉SInt16 last_reported = -1;␊
299␉UInt8 edidInfo[EDID_BLOCK_SIZE];␊
300␊
301␉UInt8 header1[] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00};␊
302␉UInt8 header2[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};␊
303␉␊
304␉SInt16 status;␊
305␉UInt16 blocks_left = 1;␊
306␉msglog("readEDID\n");␊
307␉do␊
308␉{␊
309␉␉// TODO: This currently only retrieves the *last* block, make the block buffer expand as needed / calculated from the first block␊
310␊
311␉␉bzero( edidInfo, EDID_BLOCK_SIZE);␊
312␊
313␉␉status = getEDID(edidInfo, blocks_left);␊
314␉␉␊
315␉␉␊
316␉␉msglog("Buffer location: 0x%X status: %d\n", SEG(edidInfo) << 16 | OFF(edidInfo), status);␊
317␉␉␊
318␉␉int j, i;␊
319␉␉for (j = 0; j < 8; j++) {␊
320␉␉␉for(i = 0; i < 16; i++) msglog("0x%02X ", edidInfo[((i+1) * (j + 1)) - 1]);␊
321␉␉␉msglog("\n");␊
322␉␉}␊
323␉␉␊
324␉␉␊
325␉␉␊
326␉␉if(status == 0)␊
327␉␉{␊
328␉␉␉//if( edidInfo[0] == 0x00 || edidInfo[0] == 0xFF)␊
329␉␉␉if((memcmp(edidInfo, header1, sizeof(header1)) != 0) ||␊
330␉␉␉ (memcmp(edidInfo, header2, sizeof(header2)) != 0) )␊
331␉␉␉{␊
332␉␉␉␉blocks_left--;␊
333␉␉␉␉int reported = edidInfo[ EDID_V1_BLOCKS_TO_GO_OFFSET ];␊
334␉␉␉␉␊
335␉␉␉␉if ( reported > blocks_left )␊
336␉␉␉␉{␊
337␉␉␉␉␉␊
338␉␉␉␉␉msglog("EDID claims %d more blocks left\n", reported);␊
339␉␉␉␉}␊
340␉␉␉␉␊
341␉␉␉␉if ( (last_reported <= reported && last_reported != -1)␊
342␉␉␉␉␉|| reported == 0xff␊
343␉␉␉␉␉/* 0xff frequently comes up in corrupt edids */␊
344␉␉␉␉␉//|| reported == MAGIC␊
345␉␉␉␉␉)␊
346␉␉␉␉{␊
347␉␉␉␉␉msglog("Last reported %d\n", last_reported);␊
348␉␉␉␉␉msglog( "EDID blocks left is wrong.\n"␊
349␉␉␉␉␉␉ "Your EDID is probably invalid.\n");␊
350␉␉␉␉␉return 0;␊
351␉␉␉␉}␊
352␉␉␉␉else␊
353␉␉␉␉{␊
354␉␉␉␉␉//printf("Reading EDID block\n");␊
355␉␉␉␉␉//printf("H Active = %d", ebiosInfo[56] | ((ebiosInfo[58] & 0xF0) << 4) );␊
356␉␉␉␉␉//printf("V Active = %d", ebiosInfo[59] | ((ebiosInfo[61] & 0xF0) << 4) );␊
357␊
358␉␉␉␉␉last_reported = reported;␊
359␉␉␉␉␉blocks_left = reported;␊
360␉␉␉␉}␊
361␉␉␉} ␊
362␉␉␉else␊
363␉␉␉{␊
364␉␉␉␉msglog("Invalid block %d\n", blocks_left);␊
365␉␉␉␉msglog("Header1 = %d", memcmp(edidInfo, header1, sizeof(header1)) );␊
366␉␉␉␉msglog("Header2 = %d", memcmp(edidInfo, header2, sizeof(header2)) );␊
367␉␉␉␉return 0;␊
368␉␉␉}␊
369␉␉}␊
370␉␉blocks_left = 0;␉␊
371␉} while(blocks_left);␊
372␊
373␉char* ret = malloc(sizeof(edidInfo));␊
374␉memcpy(ret, edidInfo, sizeof(edidInfo));␊
375␉return ret;␊
376}␊
377

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