1 /*
2  * Copyright 2005-2006 Erik Waling
3  * Copyright 2006 Stephane Marchesin
4  * Copyright 2007-2009 Stuart Bennett
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
21  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22  * SOFTWARE.
23  */
24 
25 #include "nouveau_drv.h"
26 #include "nouveau_reg.h"
27 #include "dispnv04/hw.h"
28 #include "nouveau_encoder.h"
29 
30 #include <linux/io-mapping.h>
31 #include <linux/firmware.h>
32 
33 /* these defines are made up */
34 #define NV_CIO_CRE_44_HEADA 0x0
35 #define NV_CIO_CRE_44_HEADB 0x3
36 #define FEATURE_MOBILE 0x10	/* also FEATURE_QUADRO for BMP */
37 
38 #define EDID1_LEN 128
39 
40 #define BIOSLOG(sip, fmt, arg...) NV_DEBUG(sip->dev, fmt, ##arg)
41 #define LOG_OLD_VALUE(x)
42 
43 struct init_exec {
44 	bool execute;
45 	bool repeat;
46 };
47 
48 static bool nv_cksum(const uint8_t *data, unsigned int length)
49 {
50 	/*
51 	 * There's a few checksums in the BIOS, so here's a generic checking
52 	 * function.
53 	 */
54 	int i;
55 	uint8_t sum = 0;
56 
57 	for (i = 0; i < length; i++)
58 		sum += data[i];
59 
60 	if (sum)
61 		return true;
62 
63 	return false;
64 }
65 
66 static uint16_t clkcmptable(struct nvbios *bios, uint16_t clktable, int pxclk)
67 {
68 	int compare_record_len, i = 0;
69 	uint16_t compareclk, scriptptr = 0;
70 
71 	if (bios->major_version < 5) /* pre BIT */
72 		compare_record_len = 3;
73 	else
74 		compare_record_len = 4;
75 
76 	do {
77 		compareclk = ROM16(bios->data[clktable + compare_record_len * i]);
78 		if (pxclk >= compareclk * 10) {
79 			if (bios->major_version < 5) {
80 				uint8_t tmdssub = bios->data[clktable + 2 + compare_record_len * i];
81 				scriptptr = ROM16(bios->data[bios->init_script_tbls_ptr + tmdssub * 2]);
82 			} else
83 				scriptptr = ROM16(bios->data[clktable + 2 + compare_record_len * i]);
84 			break;
85 		}
86 		i++;
87 	} while (compareclk);
88 
89 	return scriptptr;
90 }
91 
92 static void
93 run_digital_op_script(struct drm_device *dev, uint16_t scriptptr,
94 		      struct dcb_output *dcbent, int head, bool dl)
95 {
96 	struct nouveau_drm *drm = nouveau_drm(dev);
97 
98 	NV_INFO(drm, "0x%04X: Parsing digital output script table\n",
99 		 scriptptr);
100 	NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_44, head ? NV_CIO_CRE_44_HEADB :
101 					         NV_CIO_CRE_44_HEADA);
102 	nouveau_bios_run_init_table(dev, scriptptr, dcbent, head);
103 
104 	nv04_dfp_bind_head(dev, dcbent, head, dl);
105 }
106 
107 static int call_lvds_manufacturer_script(struct drm_device *dev, struct dcb_output *dcbent, int head, enum LVDS_script script)
108 {
109 	struct nouveau_drm *drm = nouveau_drm(dev);
110 	struct nvbios *bios = &drm->vbios;
111 	uint8_t sub = bios->data[bios->fp.xlated_entry + script] + (bios->fp.link_c_increment && dcbent->or & DCB_OUTPUT_C ? 1 : 0);
112 	uint16_t scriptofs = ROM16(bios->data[bios->init_script_tbls_ptr + sub * 2]);
113 
114 	if (!bios->fp.xlated_entry || !sub || !scriptofs)
115 		return -EINVAL;
116 
117 	run_digital_op_script(dev, scriptofs, dcbent, head, bios->fp.dual_link);
118 
119 	if (script == LVDS_PANEL_OFF) {
120 		/* off-on delay in ms */
121 		mdelay(ROM16(bios->data[bios->fp.xlated_entry + 7]));
122 	}
123 #ifdef __powerpc__
124 	/* Powerbook specific quirks */
125 	if (script == LVDS_RESET &&
126 	    (dev->pdev->device == 0x0179 || dev->pdev->device == 0x0189 ||
127 	     dev->pdev->device == 0x0329))
128 		nv_write_tmds(dev, dcbent->or, 0, 0x02, 0x72);
129 #endif
130 
131 	return 0;
132 }
133 
134 static int run_lvds_table(struct drm_device *dev, struct dcb_output *dcbent, int head, enum LVDS_script script, int pxclk)
135 {
136 	/*
137 	 * The BIT LVDS table's header has the information to setup the
138 	 * necessary registers. Following the standard 4 byte header are:
139 	 * A bitmask byte and a dual-link transition pxclk value for use in
140 	 * selecting the init script when not using straps; 4 script pointers
141 	 * for panel power, selected by output and on/off; and 8 table pointers
142 	 * for panel init, the needed one determined by output, and bits in the
143 	 * conf byte. These tables are similar to the TMDS tables, consisting
144 	 * of a list of pxclks and script pointers.
145 	 */
146 	struct nouveau_drm *drm = nouveau_drm(dev);
147 	struct nvbios *bios = &drm->vbios;
148 	unsigned int outputset = (dcbent->or == 4) ? 1 : 0;
149 	uint16_t scriptptr = 0, clktable;
150 
151 	/*
152 	 * For now we assume version 3.0 table - g80 support will need some
153 	 * changes
154 	 */
155 
156 	switch (script) {
157 	case LVDS_INIT:
158 		return -ENOSYS;
159 	case LVDS_BACKLIGHT_ON:
160 	case LVDS_PANEL_ON:
161 		scriptptr = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 7 + outputset * 2]);
162 		break;
163 	case LVDS_BACKLIGHT_OFF:
164 	case LVDS_PANEL_OFF:
165 		scriptptr = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 11 + outputset * 2]);
166 		break;
167 	case LVDS_RESET:
168 		clktable = bios->fp.lvdsmanufacturerpointer + 15;
169 		if (dcbent->or == 4)
170 			clktable += 8;
171 
172 		if (dcbent->lvdsconf.use_straps_for_mode) {
173 			if (bios->fp.dual_link)
174 				clktable += 4;
175 			if (bios->fp.if_is_24bit)
176 				clktable += 2;
177 		} else {
178 			/* using EDID */
179 			int cmpval_24bit = (dcbent->or == 4) ? 4 : 1;
180 
181 			if (bios->fp.dual_link) {
182 				clktable += 4;
183 				cmpval_24bit <<= 1;
184 			}
185 
186 			if (bios->fp.strapless_is_24bit & cmpval_24bit)
187 				clktable += 2;
188 		}
189 
190 		clktable = ROM16(bios->data[clktable]);
191 		if (!clktable) {
192 			NV_ERROR(drm, "Pixel clock comparison table not found\n");
193 			return -ENOENT;
194 		}
195 		scriptptr = clkcmptable(bios, clktable, pxclk);
196 	}
197 
198 	if (!scriptptr) {
199 		NV_ERROR(drm, "LVDS output init script not found\n");
200 		return -ENOENT;
201 	}
202 	run_digital_op_script(dev, scriptptr, dcbent, head, bios->fp.dual_link);
203 
204 	return 0;
205 }
206 
207 int call_lvds_script(struct drm_device *dev, struct dcb_output *dcbent, int head, enum LVDS_script script, int pxclk)
208 {
209 	/*
210 	 * LVDS operations are multiplexed in an effort to present a single API
211 	 * which works with two vastly differing underlying structures.
212 	 * This acts as the demux
213 	 */
214 
215 	struct nouveau_drm *drm = nouveau_drm(dev);
216 	struct nvif_object *device = &drm->client.device.object;
217 	struct nvbios *bios = &drm->vbios;
218 	uint8_t lvds_ver = bios->data[bios->fp.lvdsmanufacturerpointer];
219 	uint32_t sel_clk_binding, sel_clk;
220 	int ret;
221 
222 	if (bios->fp.last_script_invoc == (script << 1 | head) || !lvds_ver ||
223 	    (lvds_ver >= 0x30 && script == LVDS_INIT))
224 		return 0;
225 
226 	if (!bios->fp.lvds_init_run) {
227 		bios->fp.lvds_init_run = true;
228 		call_lvds_script(dev, dcbent, head, LVDS_INIT, pxclk);
229 	}
230 
231 	if (script == LVDS_PANEL_ON && bios->fp.reset_after_pclk_change)
232 		call_lvds_script(dev, dcbent, head, LVDS_RESET, pxclk);
233 	if (script == LVDS_RESET && bios->fp.power_off_for_reset)
234 		call_lvds_script(dev, dcbent, head, LVDS_PANEL_OFF, pxclk);
235 
236 	NV_INFO(drm, "Calling LVDS script %d:\n", script);
237 
238 	/* don't let script change pll->head binding */
239 	sel_clk_binding = nvif_rd32(device, NV_PRAMDAC_SEL_CLK) & 0x50000;
240 
241 	if (lvds_ver < 0x30)
242 		ret = call_lvds_manufacturer_script(dev, dcbent, head, script);
243 	else
244 		ret = run_lvds_table(dev, dcbent, head, script, pxclk);
245 
246 	bios->fp.last_script_invoc = (script << 1 | head);
247 
248 	sel_clk = NVReadRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK) & ~0x50000;
249 	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK, sel_clk | sel_clk_binding);
250 	/* some scripts set a value in NV_PBUS_POWERCTRL_2 and break video overlay */
251 	nvif_wr32(device, NV_PBUS_POWERCTRL_2, 0);
252 
253 	return ret;
254 }
255 
256 struct lvdstableheader {
257 	uint8_t lvds_ver, headerlen, recordlen;
258 };
259 
260 static int parse_lvds_manufacturer_table_header(struct drm_device *dev, struct nvbios *bios, struct lvdstableheader *lth)
261 {
262 	/*
263 	 * BMP version (0xa) LVDS table has a simple header of version and
264 	 * record length. The BIT LVDS table has the typical BIT table header:
265 	 * version byte, header length byte, record length byte, and a byte for
266 	 * the maximum number of records that can be held in the table.
267 	 */
268 
269 	struct nouveau_drm *drm = nouveau_drm(dev);
270 	uint8_t lvds_ver, headerlen, recordlen;
271 
272 	memset(lth, 0, sizeof(struct lvdstableheader));
273 
274 	if (bios->fp.lvdsmanufacturerpointer == 0x0) {
275 		NV_ERROR(drm, "Pointer to LVDS manufacturer table invalid\n");
276 		return -EINVAL;
277 	}
278 
279 	lvds_ver = bios->data[bios->fp.lvdsmanufacturerpointer];
280 
281 	switch (lvds_ver) {
282 	case 0x0a:	/* pre NV40 */
283 		headerlen = 2;
284 		recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
285 		break;
286 	case 0x30:	/* NV4x */
287 		headerlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
288 		if (headerlen < 0x1f) {
289 			NV_ERROR(drm, "LVDS table header not understood\n");
290 			return -EINVAL;
291 		}
292 		recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 2];
293 		break;
294 	case 0x40:	/* G80/G90 */
295 		headerlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
296 		if (headerlen < 0x7) {
297 			NV_ERROR(drm, "LVDS table header not understood\n");
298 			return -EINVAL;
299 		}
300 		recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 2];
301 		break;
302 	default:
303 		NV_ERROR(drm,
304 			 "LVDS table revision %d.%d not currently supported\n",
305 			 lvds_ver >> 4, lvds_ver & 0xf);
306 		return -ENOSYS;
307 	}
308 
309 	lth->lvds_ver = lvds_ver;
310 	lth->headerlen = headerlen;
311 	lth->recordlen = recordlen;
312 
313 	return 0;
314 }
315 
316 static int
317 get_fp_strap(struct drm_device *dev, struct nvbios *bios)
318 {
319 	struct nouveau_drm *drm = nouveau_drm(dev);
320 	struct nvif_object *device = &drm->client.device.object;
321 
322 	/*
323 	 * The fp strap is normally dictated by the "User Strap" in
324 	 * PEXTDEV_BOOT_0[20:16], but on BMP cards when bit 2 of the
325 	 * Internal_Flags struct at 0x48 is set, the user strap gets overriden
326 	 * by the PCI subsystem ID during POST, but not before the previous user
327 	 * strap has been committed to CR58 for CR57=0xf on head A, which may be
328 	 * read and used instead
329 	 */
330 
331 	if (bios->major_version < 5 && bios->data[0x48] & 0x4)
332 		return NVReadVgaCrtc5758(dev, 0, 0xf) & 0xf;
333 
334 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_MAXWELL)
335 		return nvif_rd32(device, 0x001800) & 0x0000000f;
336 	else
337 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA)
338 		return (nvif_rd32(device, NV_PEXTDEV_BOOT_0) >> 24) & 0xf;
339 	else
340 		return (nvif_rd32(device, NV_PEXTDEV_BOOT_0) >> 16) & 0xf;
341 }
342 
343 static int parse_fp_mode_table(struct drm_device *dev, struct nvbios *bios)
344 {
345 	struct nouveau_drm *drm = nouveau_drm(dev);
346 	uint8_t *fptable;
347 	uint8_t fptable_ver, headerlen = 0, recordlen, fpentries = 0xf, fpindex;
348 	int ret, ofs, fpstrapping;
349 	struct lvdstableheader lth;
350 
351 	if (bios->fp.fptablepointer == 0x0) {
352 		/* Most laptop cards lack an fp table. They use DDC. */
353 		NV_DEBUG(drm, "Pointer to flat panel table invalid\n");
354 		bios->digital_min_front_porch = 0x4b;
355 		return 0;
356 	}
357 
358 	fptable = &bios->data[bios->fp.fptablepointer];
359 	fptable_ver = fptable[0];
360 
361 	switch (fptable_ver) {
362 	/*
363 	 * BMP version 0x5.0x11 BIOSen have version 1 like tables, but no
364 	 * version field, and miss one of the spread spectrum/PWM bytes.
365 	 * This could affect early GF2Go parts (not seen any appropriate ROMs
366 	 * though). Here we assume that a version of 0x05 matches this case
367 	 * (combining with a BMP version check would be better), as the
368 	 * common case for the panel type field is 0x0005, and that is in
369 	 * fact what we are reading the first byte of.
370 	 */
371 	case 0x05:	/* some NV10, 11, 15, 16 */
372 		recordlen = 42;
373 		ofs = -1;
374 		break;
375 	case 0x10:	/* some NV15/16, and NV11+ */
376 		recordlen = 44;
377 		ofs = 0;
378 		break;
379 	case 0x20:	/* NV40+ */
380 		headerlen = fptable[1];
381 		recordlen = fptable[2];
382 		fpentries = fptable[3];
383 		/*
384 		 * fptable[4] is the minimum
385 		 * RAMDAC_FP_HCRTC -> RAMDAC_FP_HSYNC_START gap
386 		 */
387 		bios->digital_min_front_porch = fptable[4];
388 		ofs = -7;
389 		break;
390 	default:
391 		NV_ERROR(drm,
392 			 "FP table revision %d.%d not currently supported\n",
393 			 fptable_ver >> 4, fptable_ver & 0xf);
394 		return -ENOSYS;
395 	}
396 
397 	if (!bios->is_mobile) /* !mobile only needs digital_min_front_porch */
398 		return 0;
399 
400 	ret = parse_lvds_manufacturer_table_header(dev, bios, &lth);
401 	if (ret)
402 		return ret;
403 
404 	if (lth.lvds_ver == 0x30 || lth.lvds_ver == 0x40) {
405 		bios->fp.fpxlatetableptr = bios->fp.lvdsmanufacturerpointer +
406 							lth.headerlen + 1;
407 		bios->fp.xlatwidth = lth.recordlen;
408 	}
409 	if (bios->fp.fpxlatetableptr == 0x0) {
410 		NV_ERROR(drm, "Pointer to flat panel xlat table invalid\n");
411 		return -EINVAL;
412 	}
413 
414 	fpstrapping = get_fp_strap(dev, bios);
415 
416 	fpindex = bios->data[bios->fp.fpxlatetableptr +
417 					fpstrapping * bios->fp.xlatwidth];
418 
419 	if (fpindex > fpentries) {
420 		NV_ERROR(drm, "Bad flat panel table index\n");
421 		return -ENOENT;
422 	}
423 
424 	/* nv4x cards need both a strap value and fpindex of 0xf to use DDC */
425 	if (lth.lvds_ver > 0x10)
426 		bios->fp_no_ddc = fpstrapping != 0xf || fpindex != 0xf;
427 
428 	/*
429 	 * If either the strap or xlated fpindex value are 0xf there is no
430 	 * panel using a strap-derived bios mode present.  this condition
431 	 * includes, but is different from, the DDC panel indicator above
432 	 */
433 	if (fpstrapping == 0xf || fpindex == 0xf)
434 		return 0;
435 
436 	bios->fp.mode_ptr = bios->fp.fptablepointer + headerlen +
437 			    recordlen * fpindex + ofs;
438 
439 	NV_INFO(drm, "BIOS FP mode: %dx%d (%dkHz pixel clock)\n",
440 		 ROM16(bios->data[bios->fp.mode_ptr + 11]) + 1,
441 		 ROM16(bios->data[bios->fp.mode_ptr + 25]) + 1,
442 		 ROM16(bios->data[bios->fp.mode_ptr + 7]) * 10);
443 
444 	return 0;
445 }
446 
447 bool nouveau_bios_fp_mode(struct drm_device *dev, struct drm_display_mode *mode)
448 {
449 	struct nouveau_drm *drm = nouveau_drm(dev);
450 	struct nvbios *bios = &drm->vbios;
451 	uint8_t *mode_entry = &bios->data[bios->fp.mode_ptr];
452 
453 	if (!mode)	/* just checking whether we can produce a mode */
454 		return bios->fp.mode_ptr;
455 
456 	memset(mode, 0, sizeof(struct drm_display_mode));
457 	/*
458 	 * For version 1.0 (version in byte 0):
459 	 * bytes 1-2 are "panel type", including bits on whether Colour/mono,
460 	 * single/dual link, and type (TFT etc.)
461 	 * bytes 3-6 are bits per colour in RGBX
462 	 */
463 	mode->clock = ROM16(mode_entry[7]) * 10;
464 	/* bytes 9-10 is HActive */
465 	mode->hdisplay = ROM16(mode_entry[11]) + 1;
466 	/*
467 	 * bytes 13-14 is HValid Start
468 	 * bytes 15-16 is HValid End
469 	 */
470 	mode->hsync_start = ROM16(mode_entry[17]) + 1;
471 	mode->hsync_end = ROM16(mode_entry[19]) + 1;
472 	mode->htotal = ROM16(mode_entry[21]) + 1;
473 	/* bytes 23-24, 27-30 similarly, but vertical */
474 	mode->vdisplay = ROM16(mode_entry[25]) + 1;
475 	mode->vsync_start = ROM16(mode_entry[31]) + 1;
476 	mode->vsync_end = ROM16(mode_entry[33]) + 1;
477 	mode->vtotal = ROM16(mode_entry[35]) + 1;
478 	mode->flags |= (mode_entry[37] & 0x10) ?
479 			DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
480 	mode->flags |= (mode_entry[37] & 0x1) ?
481 			DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
482 	/*
483 	 * bytes 38-39 relate to spread spectrum settings
484 	 * bytes 40-43 are something to do with PWM
485 	 */
486 
487 	mode->status = MODE_OK;
488 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
489 	drm_mode_set_name(mode);
490 	return bios->fp.mode_ptr;
491 }
492 
493 int nouveau_bios_parse_lvds_table(struct drm_device *dev, int pxclk, bool *dl, bool *if_is_24bit)
494 {
495 	/*
496 	 * The LVDS table header is (mostly) described in
497 	 * parse_lvds_manufacturer_table_header(): the BIT header additionally
498 	 * contains the dual-link transition pxclk (in 10s kHz), at byte 5 - if
499 	 * straps are not being used for the panel, this specifies the frequency
500 	 * at which modes should be set up in the dual link style.
501 	 *
502 	 * Following the header, the BMP (ver 0xa) table has several records,
503 	 * indexed by a separate xlat table, indexed in turn by the fp strap in
504 	 * EXTDEV_BOOT. Each record had a config byte, followed by 6 script
505 	 * numbers for use by INIT_SUB which controlled panel init and power,
506 	 * and finally a dword of ms to sleep between power off and on
507 	 * operations.
508 	 *
509 	 * In the BIT versions, the table following the header serves as an
510 	 * integrated config and xlat table: the records in the table are
511 	 * indexed by the FP strap nibble in EXTDEV_BOOT, and each record has
512 	 * two bytes - the first as a config byte, the second for indexing the
513 	 * fp mode table pointed to by the BIT 'D' table
514 	 *
515 	 * DDC is not used until after card init, so selecting the correct table
516 	 * entry and setting the dual link flag for EDID equipped panels,
517 	 * requiring tests against the native-mode pixel clock, cannot be done
518 	 * until later, when this function should be called with non-zero pxclk
519 	 */
520 	struct nouveau_drm *drm = nouveau_drm(dev);
521 	struct nvbios *bios = &drm->vbios;
522 	int fpstrapping = get_fp_strap(dev, bios), lvdsmanufacturerindex = 0;
523 	struct lvdstableheader lth;
524 	uint16_t lvdsofs;
525 	int ret, chip_version = bios->chip_version;
526 
527 	ret = parse_lvds_manufacturer_table_header(dev, bios, &lth);
528 	if (ret)
529 		return ret;
530 
531 	switch (lth.lvds_ver) {
532 	case 0x0a:	/* pre NV40 */
533 		lvdsmanufacturerindex = bios->data[
534 					bios->fp.fpxlatemanufacturertableptr +
535 					fpstrapping];
536 
537 		/* we're done if this isn't the EDID panel case */
538 		if (!pxclk)
539 			break;
540 
541 		if (chip_version < 0x25) {
542 			/* nv17 behaviour
543 			 *
544 			 * It seems the old style lvds script pointer is reused
545 			 * to select 18/24 bit colour depth for EDID panels.
546 			 */
547 			lvdsmanufacturerindex =
548 				(bios->legacy.lvds_single_a_script_ptr & 1) ?
549 									2 : 0;
550 			if (pxclk >= bios->fp.duallink_transition_clk)
551 				lvdsmanufacturerindex++;
552 		} else if (chip_version < 0x30) {
553 			/* nv28 behaviour (off-chip encoder)
554 			 *
555 			 * nv28 does a complex dance of first using byte 121 of
556 			 * the EDID to choose the lvdsmanufacturerindex, then
557 			 * later attempting to match the EDID manufacturer and
558 			 * product IDs in a table (signature 'pidt' (panel id
559 			 * table?)), setting an lvdsmanufacturerindex of 0 and
560 			 * an fp strap of the match index (or 0xf if none)
561 			 */
562 			lvdsmanufacturerindex = 0;
563 		} else {
564 			/* nv31, nv34 behaviour */
565 			lvdsmanufacturerindex = 0;
566 			if (pxclk >= bios->fp.duallink_transition_clk)
567 				lvdsmanufacturerindex = 2;
568 			if (pxclk >= 140000)
569 				lvdsmanufacturerindex = 3;
570 		}
571 
572 		/*
573 		 * nvidia set the high nibble of (cr57=f, cr58) to
574 		 * lvdsmanufacturerindex in this case; we don't
575 		 */
576 		break;
577 	case 0x30:	/* NV4x */
578 	case 0x40:	/* G80/G90 */
579 		lvdsmanufacturerindex = fpstrapping;
580 		break;
581 	default:
582 		NV_ERROR(drm, "LVDS table revision not currently supported\n");
583 		return -ENOSYS;
584 	}
585 
586 	lvdsofs = bios->fp.xlated_entry = bios->fp.lvdsmanufacturerpointer + lth.headerlen + lth.recordlen * lvdsmanufacturerindex;
587 	switch (lth.lvds_ver) {
588 	case 0x0a:
589 		bios->fp.power_off_for_reset = bios->data[lvdsofs] & 1;
590 		bios->fp.reset_after_pclk_change = bios->data[lvdsofs] & 2;
591 		bios->fp.dual_link = bios->data[lvdsofs] & 4;
592 		bios->fp.link_c_increment = bios->data[lvdsofs] & 8;
593 		*if_is_24bit = bios->data[lvdsofs] & 16;
594 		break;
595 	case 0x30:
596 	case 0x40:
597 		/*
598 		 * No sign of the "power off for reset" or "reset for panel
599 		 * on" bits, but it's safer to assume we should
600 		 */
601 		bios->fp.power_off_for_reset = true;
602 		bios->fp.reset_after_pclk_change = true;
603 
604 		/*
605 		 * It's ok lvdsofs is wrong for nv4x edid case; dual_link is
606 		 * over-written, and if_is_24bit isn't used
607 		 */
608 		bios->fp.dual_link = bios->data[lvdsofs] & 1;
609 		bios->fp.if_is_24bit = bios->data[lvdsofs] & 2;
610 		bios->fp.strapless_is_24bit = bios->data[bios->fp.lvdsmanufacturerpointer + 4];
611 		bios->fp.duallink_transition_clk = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 5]) * 10;
612 		break;
613 	}
614 
615 	/* set dual_link flag for EDID case */
616 	if (pxclk && (chip_version < 0x25 || chip_version > 0x28))
617 		bios->fp.dual_link = (pxclk >= bios->fp.duallink_transition_clk);
618 
619 	*dl = bios->fp.dual_link;
620 
621 	return 0;
622 }
623 
624 int run_tmds_table(struct drm_device *dev, struct dcb_output *dcbent, int head, int pxclk)
625 {
626 	/*
627 	 * the pxclk parameter is in kHz
628 	 *
629 	 * This runs the TMDS regs setting code found on BIT bios cards
630 	 *
631 	 * For ffs(or) == 1 use the first table, for ffs(or) == 2 and
632 	 * ffs(or) == 3, use the second.
633 	 */
634 
635 	struct nouveau_drm *drm = nouveau_drm(dev);
636 	struct nvif_object *device = &drm->client.device.object;
637 	struct nvbios *bios = &drm->vbios;
638 	int cv = bios->chip_version;
639 	uint16_t clktable = 0, scriptptr;
640 	uint32_t sel_clk_binding, sel_clk;
641 
642 	/* pre-nv17 off-chip tmds uses scripts, post nv17 doesn't */
643 	if (cv >= 0x17 && cv != 0x1a && cv != 0x20 &&
644 	    dcbent->location != DCB_LOC_ON_CHIP)
645 		return 0;
646 
647 	switch (ffs(dcbent->or)) {
648 	case 1:
649 		clktable = bios->tmds.output0_script_ptr;
650 		break;
651 	case 2:
652 	case 3:
653 		clktable = bios->tmds.output1_script_ptr;
654 		break;
655 	}
656 
657 	if (!clktable) {
658 		NV_ERROR(drm, "Pixel clock comparison table not found\n");
659 		return -EINVAL;
660 	}
661 
662 	scriptptr = clkcmptable(bios, clktable, pxclk);
663 
664 	if (!scriptptr) {
665 		NV_ERROR(drm, "TMDS output init script not found\n");
666 		return -ENOENT;
667 	}
668 
669 	/* don't let script change pll->head binding */
670 	sel_clk_binding = nvif_rd32(device, NV_PRAMDAC_SEL_CLK) & 0x50000;
671 	run_digital_op_script(dev, scriptptr, dcbent, head, pxclk >= 165000);
672 	sel_clk = NVReadRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK) & ~0x50000;
673 	NVWriteRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK, sel_clk | sel_clk_binding);
674 
675 	return 0;
676 }
677 
678 static void parse_script_table_pointers(struct nvbios *bios, uint16_t offset)
679 {
680 	/*
681 	 * Parses the init table segment for pointers used in script execution.
682 	 *
683 	 * offset + 0  (16 bits): init script tables pointer
684 	 * offset + 2  (16 bits): macro index table pointer
685 	 * offset + 4  (16 bits): macro table pointer
686 	 * offset + 6  (16 bits): condition table pointer
687 	 * offset + 8  (16 bits): io condition table pointer
688 	 * offset + 10 (16 bits): io flag condition table pointer
689 	 * offset + 12 (16 bits): init function table pointer
690 	 */
691 
692 	bios->init_script_tbls_ptr = ROM16(bios->data[offset]);
693 }
694 
695 static int parse_bit_A_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
696 {
697 	/*
698 	 * Parses the load detect values for g80 cards.
699 	 *
700 	 * offset + 0 (16 bits): loadval table pointer
701 	 */
702 
703 	struct nouveau_drm *drm = nouveau_drm(dev);
704 	uint16_t load_table_ptr;
705 	uint8_t version, headerlen, entrylen, num_entries;
706 
707 	if (bitentry->length != 3) {
708 		NV_ERROR(drm, "Do not understand BIT A table\n");
709 		return -EINVAL;
710 	}
711 
712 	load_table_ptr = ROM16(bios->data[bitentry->offset]);
713 
714 	if (load_table_ptr == 0x0) {
715 		NV_DEBUG(drm, "Pointer to BIT loadval table invalid\n");
716 		return -EINVAL;
717 	}
718 
719 	version = bios->data[load_table_ptr];
720 
721 	if (version != 0x10) {
722 		NV_ERROR(drm, "BIT loadval table version %d.%d not supported\n",
723 			 version >> 4, version & 0xF);
724 		return -ENOSYS;
725 	}
726 
727 	headerlen = bios->data[load_table_ptr + 1];
728 	entrylen = bios->data[load_table_ptr + 2];
729 	num_entries = bios->data[load_table_ptr + 3];
730 
731 	if (headerlen != 4 || entrylen != 4 || num_entries != 2) {
732 		NV_ERROR(drm, "Do not understand BIT loadval table\n");
733 		return -EINVAL;
734 	}
735 
736 	/* First entry is normal dac, 2nd tv-out perhaps? */
737 	bios->dactestval = ROM32(bios->data[load_table_ptr + headerlen]) & 0x3ff;
738 
739 	return 0;
740 }
741 
742 static int parse_bit_display_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
743 {
744 	/*
745 	 * Parses the flat panel table segment that the bit entry points to.
746 	 * Starting at bitentry->offset:
747 	 *
748 	 * offset + 0  (16 bits): ??? table pointer - seems to have 18 byte
749 	 * records beginning with a freq.
750 	 * offset + 2  (16 bits): mode table pointer
751 	 */
752 	struct nouveau_drm *drm = nouveau_drm(dev);
753 
754 	if (bitentry->length != 4) {
755 		NV_ERROR(drm, "Do not understand BIT display table\n");
756 		return -EINVAL;
757 	}
758 
759 	bios->fp.fptablepointer = ROM16(bios->data[bitentry->offset + 2]);
760 
761 	return 0;
762 }
763 
764 static int parse_bit_init_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
765 {
766 	/*
767 	 * Parses the init table segment that the bit entry points to.
768 	 *
769 	 * See parse_script_table_pointers for layout
770 	 */
771 	struct nouveau_drm *drm = nouveau_drm(dev);
772 
773 	if (bitentry->length < 14) {
774 		NV_ERROR(drm, "Do not understand init table\n");
775 		return -EINVAL;
776 	}
777 
778 	parse_script_table_pointers(bios, bitentry->offset);
779 	return 0;
780 }
781 
782 static int parse_bit_i_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
783 {
784 	/*
785 	 * BIT 'i' (info?) table
786 	 *
787 	 * offset + 0  (32 bits): BIOS version dword (as in B table)
788 	 * offset + 5  (8  bits): BIOS feature byte (same as for BMP?)
789 	 * offset + 13 (16 bits): pointer to table containing DAC load
790 	 * detection comparison values
791 	 *
792 	 * There's other things in the table, purpose unknown
793 	 */
794 
795 	struct nouveau_drm *drm = nouveau_drm(dev);
796 	uint16_t daccmpoffset;
797 	uint8_t dacver, dacheaderlen;
798 
799 	if (bitentry->length < 6) {
800 		NV_ERROR(drm, "BIT i table too short for needed information\n");
801 		return -EINVAL;
802 	}
803 
804 	/*
805 	 * bit 4 seems to indicate a mobile bios (doesn't suffer from BMP's
806 	 * Quadro identity crisis), other bits possibly as for BMP feature byte
807 	 */
808 	bios->feature_byte = bios->data[bitentry->offset + 5];
809 	bios->is_mobile = bios->feature_byte & FEATURE_MOBILE;
810 
811 	if (bitentry->length < 15) {
812 		NV_WARN(drm, "BIT i table not long enough for DAC load "
813 			       "detection comparison table\n");
814 		return -EINVAL;
815 	}
816 
817 	daccmpoffset = ROM16(bios->data[bitentry->offset + 13]);
818 
819 	/* doesn't exist on g80 */
820 	if (!daccmpoffset)
821 		return 0;
822 
823 	/*
824 	 * The first value in the table, following the header, is the
825 	 * comparison value, the second entry is a comparison value for
826 	 * TV load detection.
827 	 */
828 
829 	dacver = bios->data[daccmpoffset];
830 	dacheaderlen = bios->data[daccmpoffset + 1];
831 
832 	if (dacver != 0x00 && dacver != 0x10) {
833 		NV_WARN(drm, "DAC load detection comparison table version "
834 			       "%d.%d not known\n", dacver >> 4, dacver & 0xf);
835 		return -ENOSYS;
836 	}
837 
838 	bios->dactestval = ROM32(bios->data[daccmpoffset + dacheaderlen]);
839 	bios->tvdactestval = ROM32(bios->data[daccmpoffset + dacheaderlen + 4]);
840 
841 	return 0;
842 }
843 
844 static int parse_bit_lvds_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
845 {
846 	/*
847 	 * Parses the LVDS table segment that the bit entry points to.
848 	 * Starting at bitentry->offset:
849 	 *
850 	 * offset + 0  (16 bits): LVDS strap xlate table pointer
851 	 */
852 
853 	struct nouveau_drm *drm = nouveau_drm(dev);
854 
855 	if (bitentry->length != 2) {
856 		NV_ERROR(drm, "Do not understand BIT LVDS table\n");
857 		return -EINVAL;
858 	}
859 
860 	/*
861 	 * No idea if it's still called the LVDS manufacturer table, but
862 	 * the concept's close enough.
863 	 */
864 	bios->fp.lvdsmanufacturerpointer = ROM16(bios->data[bitentry->offset]);
865 
866 	return 0;
867 }
868 
869 static int
870 parse_bit_M_tbl_entry(struct drm_device *dev, struct nvbios *bios,
871 		      struct bit_entry *bitentry)
872 {
873 	/*
874 	 * offset + 2  (8  bits): number of options in an
875 	 * 	INIT_RAM_RESTRICT_ZM_REG_GROUP opcode option set
876 	 * offset + 3  (16 bits): pointer to strap xlate table for RAM
877 	 * 	restrict option selection
878 	 *
879 	 * There's a bunch of bits in this table other than the RAM restrict
880 	 * stuff that we don't use - their use currently unknown
881 	 */
882 
883 	/*
884 	 * Older bios versions don't have a sufficiently long table for
885 	 * what we want
886 	 */
887 	if (bitentry->length < 0x5)
888 		return 0;
889 
890 	if (bitentry->version < 2) {
891 		bios->ram_restrict_group_count = bios->data[bitentry->offset + 2];
892 		bios->ram_restrict_tbl_ptr = ROM16(bios->data[bitentry->offset + 3]);
893 	} else {
894 		bios->ram_restrict_group_count = bios->data[bitentry->offset + 0];
895 		bios->ram_restrict_tbl_ptr = ROM16(bios->data[bitentry->offset + 1]);
896 	}
897 
898 	return 0;
899 }
900 
901 static int parse_bit_tmds_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
902 {
903 	/*
904 	 * Parses the pointer to the TMDS table
905 	 *
906 	 * Starting at bitentry->offset:
907 	 *
908 	 * offset + 0  (16 bits): TMDS table pointer
909 	 *
910 	 * The TMDS table is typically found just before the DCB table, with a
911 	 * characteristic signature of 0x11,0x13 (1.1 being version, 0x13 being
912 	 * length?)
913 	 *
914 	 * At offset +7 is a pointer to a script, which I don't know how to
915 	 * run yet.
916 	 * At offset +9 is a pointer to another script, likewise
917 	 * Offset +11 has a pointer to a table where the first word is a pxclk
918 	 * frequency and the second word a pointer to a script, which should be
919 	 * run if the comparison pxclk frequency is less than the pxclk desired.
920 	 * This repeats for decreasing comparison frequencies
921 	 * Offset +13 has a pointer to a similar table
922 	 * The selection of table (and possibly +7/+9 script) is dictated by
923 	 * "or" from the DCB.
924 	 */
925 
926 	struct nouveau_drm *drm = nouveau_drm(dev);
927 	uint16_t tmdstableptr, script1, script2;
928 
929 	if (bitentry->length != 2) {
930 		NV_ERROR(drm, "Do not understand BIT TMDS table\n");
931 		return -EINVAL;
932 	}
933 
934 	tmdstableptr = ROM16(bios->data[bitentry->offset]);
935 	if (!tmdstableptr) {
936 		NV_INFO(drm, "Pointer to TMDS table not found\n");
937 		return -EINVAL;
938 	}
939 
940 	NV_INFO(drm, "TMDS table version %d.%d\n",
941 		bios->data[tmdstableptr] >> 4, bios->data[tmdstableptr] & 0xf);
942 
943 	/* nv50+ has v2.0, but we don't parse it atm */
944 	if (bios->data[tmdstableptr] != 0x11)
945 		return -ENOSYS;
946 
947 	/*
948 	 * These two scripts are odd: they don't seem to get run even when
949 	 * they are not stubbed.
950 	 */
951 	script1 = ROM16(bios->data[tmdstableptr + 7]);
952 	script2 = ROM16(bios->data[tmdstableptr + 9]);
953 	if (bios->data[script1] != 'q' || bios->data[script2] != 'q')
954 		NV_WARN(drm, "TMDS table script pointers not stubbed\n");
955 
956 	bios->tmds.output0_script_ptr = ROM16(bios->data[tmdstableptr + 11]);
957 	bios->tmds.output1_script_ptr = ROM16(bios->data[tmdstableptr + 13]);
958 
959 	return 0;
960 }
961 
962 struct bit_table {
963 	const char id;
964 	int (* const parse_fn)(struct drm_device *, struct nvbios *, struct bit_entry *);
965 };
966 
967 #define BIT_TABLE(id, funcid) ((struct bit_table){ id, parse_bit_##funcid##_tbl_entry })
968 
969 int
970 bit_table(struct drm_device *dev, u8 id, struct bit_entry *bit)
971 {
972 	struct nouveau_drm *drm = nouveau_drm(dev);
973 	struct nvbios *bios = &drm->vbios;
974 	u8 entries, *entry;
975 
976 	if (bios->type != NVBIOS_BIT)
977 		return -ENODEV;
978 
979 	entries = bios->data[bios->offset + 10];
980 	entry   = &bios->data[bios->offset + 12];
981 	while (entries--) {
982 		if (entry[0] == id) {
983 			bit->id = entry[0];
984 			bit->version = entry[1];
985 			bit->length = ROM16(entry[2]);
986 			bit->offset = ROM16(entry[4]);
987 			bit->data = ROMPTR(dev, entry[4]);
988 			return 0;
989 		}
990 
991 		entry += bios->data[bios->offset + 9];
992 	}
993 
994 	return -ENOENT;
995 }
996 
997 static int
998 parse_bit_table(struct nvbios *bios, const uint16_t bitoffset,
999 		struct bit_table *table)
1000 {
1001 	struct drm_device *dev = bios->dev;
1002 	struct nouveau_drm *drm = nouveau_drm(dev);
1003 	struct bit_entry bitentry;
1004 
1005 	if (bit_table(dev, table->id, &bitentry) == 0)
1006 		return table->parse_fn(dev, bios, &bitentry);
1007 
1008 	NV_INFO(drm, "BIT table '%c' not found\n", table->id);
1009 	return -ENOSYS;
1010 }
1011 
1012 static int
1013 parse_bit_structure(struct nvbios *bios, const uint16_t bitoffset)
1014 {
1015 	int ret;
1016 
1017 	/*
1018 	 * The only restriction on parsing order currently is having 'i' first
1019 	 * for use of bios->*_version or bios->feature_byte while parsing;
1020 	 * functions shouldn't be actually *doing* anything apart from pulling
1021 	 * data from the image into the bios struct, thus no interdependencies
1022 	 */
1023 	ret = parse_bit_table(bios, bitoffset, &BIT_TABLE('i', i));
1024 	if (ret) /* info? */
1025 		return ret;
1026 	if (bios->major_version >= 0x60) /* g80+ */
1027 		parse_bit_table(bios, bitoffset, &BIT_TABLE('A', A));
1028 	parse_bit_table(bios, bitoffset, &BIT_TABLE('D', display));
1029 	ret = parse_bit_table(bios, bitoffset, &BIT_TABLE('I', init));
1030 	if (ret)
1031 		return ret;
1032 	parse_bit_table(bios, bitoffset, &BIT_TABLE('M', M)); /* memory? */
1033 	parse_bit_table(bios, bitoffset, &BIT_TABLE('L', lvds));
1034 	parse_bit_table(bios, bitoffset, &BIT_TABLE('T', tmds));
1035 
1036 	return 0;
1037 }
1038 
1039 static int parse_bmp_structure(struct drm_device *dev, struct nvbios *bios, unsigned int offset)
1040 {
1041 	/*
1042 	 * Parses the BMP structure for useful things, but does not act on them
1043 	 *
1044 	 * offset +   5: BMP major version
1045 	 * offset +   6: BMP minor version
1046 	 * offset +   9: BMP feature byte
1047 	 * offset +  10: BCD encoded BIOS version
1048 	 *
1049 	 * offset +  18: init script table pointer (for bios versions < 5.10h)
1050 	 * offset +  20: extra init script table pointer (for bios
1051 	 * versions < 5.10h)
1052 	 *
1053 	 * offset +  24: memory init table pointer (used on early bios versions)
1054 	 * offset +  26: SDR memory sequencing setup data table
1055 	 * offset +  28: DDR memory sequencing setup data table
1056 	 *
1057 	 * offset +  54: index of I2C CRTC pair to use for CRT output
1058 	 * offset +  55: index of I2C CRTC pair to use for TV output
1059 	 * offset +  56: index of I2C CRTC pair to use for flat panel output
1060 	 * offset +  58: write CRTC index for I2C pair 0
1061 	 * offset +  59: read CRTC index for I2C pair 0
1062 	 * offset +  60: write CRTC index for I2C pair 1
1063 	 * offset +  61: read CRTC index for I2C pair 1
1064 	 *
1065 	 * offset +  67: maximum internal PLL frequency (single stage PLL)
1066 	 * offset +  71: minimum internal PLL frequency (single stage PLL)
1067 	 *
1068 	 * offset +  75: script table pointers, as described in
1069 	 * parse_script_table_pointers
1070 	 *
1071 	 * offset +  89: TMDS single link output A table pointer
1072 	 * offset +  91: TMDS single link output B table pointer
1073 	 * offset +  95: LVDS single link output A table pointer
1074 	 * offset + 105: flat panel timings table pointer
1075 	 * offset + 107: flat panel strapping translation table pointer
1076 	 * offset + 117: LVDS manufacturer panel config table pointer
1077 	 * offset + 119: LVDS manufacturer strapping translation table pointer
1078 	 *
1079 	 * offset + 142: PLL limits table pointer
1080 	 *
1081 	 * offset + 156: minimum pixel clock for LVDS dual link
1082 	 */
1083 
1084 	struct nouveau_drm *drm = nouveau_drm(dev);
1085 	uint8_t *bmp = &bios->data[offset], bmp_version_major, bmp_version_minor;
1086 	uint16_t bmplength;
1087 	uint16_t legacy_scripts_offset, legacy_i2c_offset;
1088 
1089 	/* load needed defaults in case we can't parse this info */
1090 	bios->digital_min_front_porch = 0x4b;
1091 	bios->fmaxvco = 256000;
1092 	bios->fminvco = 128000;
1093 	bios->fp.duallink_transition_clk = 90000;
1094 
1095 	bmp_version_major = bmp[5];
1096 	bmp_version_minor = bmp[6];
1097 
1098 	NV_INFO(drm, "BMP version %d.%d\n",
1099 		 bmp_version_major, bmp_version_minor);
1100 
1101 	/*
1102 	 * Make sure that 0x36 is blank and can't be mistaken for a DCB
1103 	 * pointer on early versions
1104 	 */
1105 	if (bmp_version_major < 5)
1106 		*(uint16_t *)&bios->data[0x36] = 0;
1107 
1108 	/*
1109 	 * Seems that the minor version was 1 for all major versions prior
1110 	 * to 5. Version 6 could theoretically exist, but I suspect BIT
1111 	 * happened instead.
1112 	 */
1113 	if ((bmp_version_major < 5 && bmp_version_minor != 1) || bmp_version_major > 5) {
1114 		NV_ERROR(drm, "You have an unsupported BMP version. "
1115 				"Please send in your bios\n");
1116 		return -ENOSYS;
1117 	}
1118 
1119 	if (bmp_version_major == 0)
1120 		/* nothing that's currently useful in this version */
1121 		return 0;
1122 	else if (bmp_version_major == 1)
1123 		bmplength = 44; /* exact for 1.01 */
1124 	else if (bmp_version_major == 2)
1125 		bmplength = 48; /* exact for 2.01 */
1126 	else if (bmp_version_major == 3)
1127 		bmplength = 54;
1128 		/* guessed - mem init tables added in this version */
1129 	else if (bmp_version_major == 4 || bmp_version_minor < 0x1)
1130 		/* don't know if 5.0 exists... */
1131 		bmplength = 62;
1132 		/* guessed - BMP I2C indices added in version 4*/
1133 	else if (bmp_version_minor < 0x6)
1134 		bmplength = 67; /* exact for 5.01 */
1135 	else if (bmp_version_minor < 0x10)
1136 		bmplength = 75; /* exact for 5.06 */
1137 	else if (bmp_version_minor == 0x10)
1138 		bmplength = 89; /* exact for 5.10h */
1139 	else if (bmp_version_minor < 0x14)
1140 		bmplength = 118; /* exact for 5.11h */
1141 	else if (bmp_version_minor < 0x24)
1142 		/*
1143 		 * Not sure of version where pll limits came in;
1144 		 * certainly exist by 0x24 though.
1145 		 */
1146 		/* length not exact: this is long enough to get lvds members */
1147 		bmplength = 123;
1148 	else if (bmp_version_minor < 0x27)
1149 		/*
1150 		 * Length not exact: this is long enough to get pll limit
1151 		 * member
1152 		 */
1153 		bmplength = 144;
1154 	else
1155 		/*
1156 		 * Length not exact: this is long enough to get dual link
1157 		 * transition clock.
1158 		 */
1159 		bmplength = 158;
1160 
1161 	/* checksum */
1162 	if (nv_cksum(bmp, 8)) {
1163 		NV_ERROR(drm, "Bad BMP checksum\n");
1164 		return -EINVAL;
1165 	}
1166 
1167 	/*
1168 	 * Bit 4 seems to indicate either a mobile bios or a quadro card --
1169 	 * mobile behaviour consistent (nv11+), quadro only seen nv18gl-nv36gl
1170 	 * (not nv10gl), bit 5 that the flat panel tables are present, and
1171 	 * bit 6 a tv bios.
1172 	 */
1173 	bios->feature_byte = bmp[9];
1174 
1175 	if (bmp_version_major < 5 || bmp_version_minor < 0x10)
1176 		bios->old_style_init = true;
1177 	legacy_scripts_offset = 18;
1178 	if (bmp_version_major < 2)
1179 		legacy_scripts_offset -= 4;
1180 	bios->init_script_tbls_ptr = ROM16(bmp[legacy_scripts_offset]);
1181 	bios->extra_init_script_tbl_ptr = ROM16(bmp[legacy_scripts_offset + 2]);
1182 
1183 	if (bmp_version_major > 2) {	/* appears in BMP 3 */
1184 		bios->legacy.mem_init_tbl_ptr = ROM16(bmp[24]);
1185 		bios->legacy.sdr_seq_tbl_ptr = ROM16(bmp[26]);
1186 		bios->legacy.ddr_seq_tbl_ptr = ROM16(bmp[28]);
1187 	}
1188 
1189 	legacy_i2c_offset = 0x48;	/* BMP version 2 & 3 */
1190 	if (bmplength > 61)
1191 		legacy_i2c_offset = offset + 54;
1192 	bios->legacy.i2c_indices.crt = bios->data[legacy_i2c_offset];
1193 	bios->legacy.i2c_indices.tv = bios->data[legacy_i2c_offset + 1];
1194 	bios->legacy.i2c_indices.panel = bios->data[legacy_i2c_offset + 2];
1195 
1196 	if (bmplength > 74) {
1197 		bios->fmaxvco = ROM32(bmp[67]);
1198 		bios->fminvco = ROM32(bmp[71]);
1199 	}
1200 	if (bmplength > 88)
1201 		parse_script_table_pointers(bios, offset + 75);
1202 	if (bmplength > 94) {
1203 		bios->tmds.output0_script_ptr = ROM16(bmp[89]);
1204 		bios->tmds.output1_script_ptr = ROM16(bmp[91]);
1205 		/*
1206 		 * Never observed in use with lvds scripts, but is reused for
1207 		 * 18/24 bit panel interface default for EDID equipped panels
1208 		 * (if_is_24bit not set directly to avoid any oscillation).
1209 		 */
1210 		bios->legacy.lvds_single_a_script_ptr = ROM16(bmp[95]);
1211 	}
1212 	if (bmplength > 108) {
1213 		bios->fp.fptablepointer = ROM16(bmp[105]);
1214 		bios->fp.fpxlatetableptr = ROM16(bmp[107]);
1215 		bios->fp.xlatwidth = 1;
1216 	}
1217 	if (bmplength > 120) {
1218 		bios->fp.lvdsmanufacturerpointer = ROM16(bmp[117]);
1219 		bios->fp.fpxlatemanufacturertableptr = ROM16(bmp[119]);
1220 	}
1221 #if 0
1222 	if (bmplength > 143)
1223 		bios->pll_limit_tbl_ptr = ROM16(bmp[142]);
1224 #endif
1225 
1226 	if (bmplength > 157)
1227 		bios->fp.duallink_transition_clk = ROM16(bmp[156]) * 10;
1228 
1229 	return 0;
1230 }
1231 
1232 static uint16_t findstr(uint8_t *data, int n, const uint8_t *str, int len)
1233 {
1234 	int i, j;
1235 
1236 	for (i = 0; i <= (n - len); i++) {
1237 		for (j = 0; j < len; j++)
1238 			if (data[i + j] != str[j])
1239 				break;
1240 		if (j == len)
1241 			return i;
1242 	}
1243 
1244 	return 0;
1245 }
1246 
1247 void *
1248 olddcb_table(struct drm_device *dev)
1249 {
1250 	struct nouveau_drm *drm = nouveau_drm(dev);
1251 	u8 *dcb = NULL;
1252 
1253 	if (drm->client.device.info.family > NV_DEVICE_INFO_V0_TNT)
1254 		dcb = ROMPTR(dev, drm->vbios.data[0x36]);
1255 	if (!dcb) {
1256 		NV_WARN(drm, "No DCB data found in VBIOS\n");
1257 		return NULL;
1258 	}
1259 
1260 	if (dcb[0] >= 0x42) {
1261 		NV_WARN(drm, "DCB version 0x%02x unknown\n", dcb[0]);
1262 		return NULL;
1263 	} else
1264 	if (dcb[0] >= 0x30) {
1265 		if (ROM32(dcb[6]) == 0x4edcbdcb)
1266 			return dcb;
1267 	} else
1268 	if (dcb[0] >= 0x20) {
1269 		if (ROM32(dcb[4]) == 0x4edcbdcb)
1270 			return dcb;
1271 	} else
1272 	if (dcb[0] >= 0x15) {
1273 		if (!memcmp(&dcb[-7], "DEV_REC", 7))
1274 			return dcb;
1275 	} else {
1276 		/*
1277 		 * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but
1278 		 * always has the same single (crt) entry, even when tv-out
1279 		 * present, so the conclusion is this version cannot really
1280 		 * be used.
1281 		 *
1282 		 * v1.2 tables (some NV6/10, and NV15+) normally have the
1283 		 * same 5 entries, which are not specific to the card and so
1284 		 * no use.
1285 		 *
1286 		 * v1.2 does have an I2C table that read_dcb_i2c_table can
1287 		 * handle, but cards exist (nv11 in #14821) with a bad i2c
1288 		 * table pointer, so use the indices parsed in
1289 		 * parse_bmp_structure.
1290 		 *
1291 		 * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
1292 		 */
1293 		NV_WARN(drm, "No useful DCB data in VBIOS\n");
1294 		return NULL;
1295 	}
1296 
1297 	NV_WARN(drm, "DCB header validation failed\n");
1298 	return NULL;
1299 }
1300 
1301 void *
1302 olddcb_outp(struct drm_device *dev, u8 idx)
1303 {
1304 	u8 *dcb = olddcb_table(dev);
1305 	if (dcb && dcb[0] >= 0x30) {
1306 		if (idx < dcb[2])
1307 			return dcb + dcb[1] + (idx * dcb[3]);
1308 	} else
1309 	if (dcb && dcb[0] >= 0x20) {
1310 		u8 *i2c = ROMPTR(dev, dcb[2]);
1311 		u8 *ent = dcb + 8 + (idx * 8);
1312 		if (i2c && ent < i2c)
1313 			return ent;
1314 	} else
1315 	if (dcb && dcb[0] >= 0x15) {
1316 		u8 *i2c = ROMPTR(dev, dcb[2]);
1317 		u8 *ent = dcb + 4 + (idx * 10);
1318 		if (i2c && ent < i2c)
1319 			return ent;
1320 	}
1321 
1322 	return NULL;
1323 }
1324 
1325 int
1326 olddcb_outp_foreach(struct drm_device *dev, void *data,
1327 		 int (*exec)(struct drm_device *, void *, int idx, u8 *outp))
1328 {
1329 	int ret, idx = -1;
1330 	u8 *outp = NULL;
1331 	while ((outp = olddcb_outp(dev, ++idx))) {
1332 		if (ROM32(outp[0]) == 0x00000000)
1333 			break; /* seen on an NV11 with DCB v1.5 */
1334 		if (ROM32(outp[0]) == 0xffffffff)
1335 			break; /* seen on an NV17 with DCB v2.0 */
1336 
1337 		if ((outp[0] & 0x0f) == DCB_OUTPUT_UNUSED)
1338 			continue;
1339 		if ((outp[0] & 0x0f) == DCB_OUTPUT_EOL)
1340 			break;
1341 
1342 		ret = exec(dev, data, idx, outp);
1343 		if (ret)
1344 			return ret;
1345 	}
1346 
1347 	return 0;
1348 }
1349 
1350 u8 *
1351 olddcb_conntab(struct drm_device *dev)
1352 {
1353 	u8 *dcb = olddcb_table(dev);
1354 	if (dcb && dcb[0] >= 0x30 && dcb[1] >= 0x16) {
1355 		u8 *conntab = ROMPTR(dev, dcb[0x14]);
1356 		if (conntab && conntab[0] >= 0x30 && conntab[0] <= 0x40)
1357 			return conntab;
1358 	}
1359 	return NULL;
1360 }
1361 
1362 u8 *
1363 olddcb_conn(struct drm_device *dev, u8 idx)
1364 {
1365 	u8 *conntab = olddcb_conntab(dev);
1366 	if (conntab && idx < conntab[2])
1367 		return conntab + conntab[1] + (idx * conntab[3]);
1368 	return NULL;
1369 }
1370 
1371 static struct dcb_output *new_dcb_entry(struct dcb_table *dcb)
1372 {
1373 	struct dcb_output *entry = &dcb->entry[dcb->entries];
1374 
1375 	memset(entry, 0, sizeof(struct dcb_output));
1376 	entry->index = dcb->entries++;
1377 
1378 	return entry;
1379 }
1380 
1381 static void fabricate_dcb_output(struct dcb_table *dcb, int type, int i2c,
1382 				 int heads, int or)
1383 {
1384 	struct dcb_output *entry = new_dcb_entry(dcb);
1385 
1386 	entry->type = type;
1387 	entry->i2c_index = i2c;
1388 	entry->heads = heads;
1389 	if (type != DCB_OUTPUT_ANALOG)
1390 		entry->location = !DCB_LOC_ON_CHIP; /* ie OFF CHIP */
1391 	entry->or = or;
1392 }
1393 
1394 static bool
1395 parse_dcb20_entry(struct drm_device *dev, struct dcb_table *dcb,
1396 		  uint32_t conn, uint32_t conf, struct dcb_output *entry)
1397 {
1398 	struct nouveau_drm *drm = nouveau_drm(dev);
1399 	int link = 0;
1400 
1401 	entry->type = conn & 0xf;
1402 	entry->i2c_index = (conn >> 4) & 0xf;
1403 	entry->heads = (conn >> 8) & 0xf;
1404 	entry->connector = (conn >> 12) & 0xf;
1405 	entry->bus = (conn >> 16) & 0xf;
1406 	entry->location = (conn >> 20) & 0x3;
1407 	entry->or = (conn >> 24) & 0xf;
1408 
1409 	switch (entry->type) {
1410 	case DCB_OUTPUT_ANALOG:
1411 		/*
1412 		 * Although the rest of a CRT conf dword is usually
1413 		 * zeros, mac biosen have stuff there so we must mask
1414 		 */
1415 		entry->crtconf.maxfreq = (dcb->version < 0x30) ?
1416 					 (conf & 0xffff) * 10 :
1417 					 (conf & 0xff) * 10000;
1418 		break;
1419 	case DCB_OUTPUT_LVDS:
1420 		{
1421 		uint32_t mask;
1422 		if (conf & 0x1)
1423 			entry->lvdsconf.use_straps_for_mode = true;
1424 		if (dcb->version < 0x22) {
1425 			mask = ~0xd;
1426 			/*
1427 			 * The laptop in bug 14567 lies and claims to not use
1428 			 * straps when it does, so assume all DCB 2.0 laptops
1429 			 * use straps, until a broken EDID using one is produced
1430 			 */
1431 			entry->lvdsconf.use_straps_for_mode = true;
1432 			/*
1433 			 * Both 0x4 and 0x8 show up in v2.0 tables; assume they
1434 			 * mean the same thing (probably wrong, but might work)
1435 			 */
1436 			if (conf & 0x4 || conf & 0x8)
1437 				entry->lvdsconf.use_power_scripts = true;
1438 		} else {
1439 			mask = ~0x7;
1440 			if (conf & 0x2)
1441 				entry->lvdsconf.use_acpi_for_edid = true;
1442 			if (conf & 0x4)
1443 				entry->lvdsconf.use_power_scripts = true;
1444 			entry->lvdsconf.sor.link = (conf & 0x00000030) >> 4;
1445 			link = entry->lvdsconf.sor.link;
1446 		}
1447 		if (conf & mask) {
1448 			/*
1449 			 * Until we even try to use these on G8x, it's
1450 			 * useless reporting unknown bits.  They all are.
1451 			 */
1452 			if (dcb->version >= 0x40)
1453 				break;
1454 
1455 			NV_ERROR(drm, "Unknown LVDS configuration bits, "
1456 				      "please report\n");
1457 		}
1458 		break;
1459 		}
1460 	case DCB_OUTPUT_TV:
1461 	{
1462 		if (dcb->version >= 0x30)
1463 			entry->tvconf.has_component_output = conf & (0x8 << 4);
1464 		else
1465 			entry->tvconf.has_component_output = false;
1466 
1467 		break;
1468 	}
1469 	case DCB_OUTPUT_DP:
1470 		entry->dpconf.sor.link = (conf & 0x00000030) >> 4;
1471 		entry->extdev = (conf & 0x0000ff00) >> 8;
1472 		switch ((conf & 0x00e00000) >> 21) {
1473 		case 0:
1474 			entry->dpconf.link_bw = 162000;
1475 			break;
1476 		case 1:
1477 			entry->dpconf.link_bw = 270000;
1478 			break;
1479 		case 2:
1480 			entry->dpconf.link_bw = 540000;
1481 			break;
1482 		case 3:
1483 		default:
1484 			entry->dpconf.link_bw = 810000;
1485 			break;
1486 		}
1487 		switch ((conf & 0x0f000000) >> 24) {
1488 		case 0xf:
1489 		case 0x4:
1490 			entry->dpconf.link_nr = 4;
1491 			break;
1492 		case 0x3:
1493 		case 0x2:
1494 			entry->dpconf.link_nr = 2;
1495 			break;
1496 		default:
1497 			entry->dpconf.link_nr = 1;
1498 			break;
1499 		}
1500 		link = entry->dpconf.sor.link;
1501 		break;
1502 	case DCB_OUTPUT_TMDS:
1503 		if (dcb->version >= 0x40) {
1504 			entry->tmdsconf.sor.link = (conf & 0x00000030) >> 4;
1505 			entry->extdev = (conf & 0x0000ff00) >> 8;
1506 			link = entry->tmdsconf.sor.link;
1507 		}
1508 		else if (dcb->version >= 0x30)
1509 			entry->tmdsconf.slave_addr = (conf & 0x00000700) >> 8;
1510 		else if (dcb->version >= 0x22)
1511 			entry->tmdsconf.slave_addr = (conf & 0x00000070) >> 4;
1512 		break;
1513 	case DCB_OUTPUT_EOL:
1514 		/* weird g80 mobile type that "nv" treats as a terminator */
1515 		dcb->entries--;
1516 		return false;
1517 	default:
1518 		break;
1519 	}
1520 
1521 	if (dcb->version < 0x40) {
1522 		/* Normal entries consist of a single bit, but dual link has
1523 		 * the next most significant bit set too
1524 		 */
1525 		entry->duallink_possible =
1526 			((1 << (ffs(entry->or) - 1)) * 3 == entry->or);
1527 	} else {
1528 		entry->duallink_possible = (entry->sorconf.link == 3);
1529 	}
1530 
1531 	/* unsure what DCB version introduces this, 3.0? */
1532 	if (conf & 0x100000)
1533 		entry->i2c_upper_default = true;
1534 
1535 	entry->hasht = (entry->extdev << 8) | (entry->location << 4) |
1536 			entry->type;
1537 	entry->hashm = (entry->heads << 8) | (link << 6) | entry->or;
1538 	return true;
1539 }
1540 
1541 static bool
1542 parse_dcb15_entry(struct drm_device *dev, struct dcb_table *dcb,
1543 		  uint32_t conn, uint32_t conf, struct dcb_output *entry)
1544 {
1545 	struct nouveau_drm *drm = nouveau_drm(dev);
1546 
1547 	switch (conn & 0x0000000f) {
1548 	case 0:
1549 		entry->type = DCB_OUTPUT_ANALOG;
1550 		break;
1551 	case 1:
1552 		entry->type = DCB_OUTPUT_TV;
1553 		break;
1554 	case 2:
1555 	case 4:
1556 		if (conn & 0x10)
1557 			entry->type = DCB_OUTPUT_LVDS;
1558 		else
1559 			entry->type = DCB_OUTPUT_TMDS;
1560 		break;
1561 	case 3:
1562 		entry->type = DCB_OUTPUT_LVDS;
1563 		break;
1564 	default:
1565 		NV_ERROR(drm, "Unknown DCB type %d\n", conn & 0x0000000f);
1566 		return false;
1567 	}
1568 
1569 	entry->i2c_index = (conn & 0x0003c000) >> 14;
1570 	entry->heads = ((conn & 0x001c0000) >> 18) + 1;
1571 	entry->or = entry->heads; /* same as heads, hopefully safe enough */
1572 	entry->location = (conn & 0x01e00000) >> 21;
1573 	entry->bus = (conn & 0x0e000000) >> 25;
1574 	entry->duallink_possible = false;
1575 
1576 	switch (entry->type) {
1577 	case DCB_OUTPUT_ANALOG:
1578 		entry->crtconf.maxfreq = (conf & 0xffff) * 10;
1579 		break;
1580 	case DCB_OUTPUT_TV:
1581 		entry->tvconf.has_component_output = false;
1582 		break;
1583 	case DCB_OUTPUT_LVDS:
1584 		if ((conn & 0x00003f00) >> 8 != 0x10)
1585 			entry->lvdsconf.use_straps_for_mode = true;
1586 		entry->lvdsconf.use_power_scripts = true;
1587 		break;
1588 	default:
1589 		break;
1590 	}
1591 
1592 	return true;
1593 }
1594 
1595 static
1596 void merge_like_dcb_entries(struct drm_device *dev, struct dcb_table *dcb)
1597 {
1598 	/*
1599 	 * DCB v2.0 lists each output combination separately.
1600 	 * Here we merge compatible entries to have fewer outputs, with
1601 	 * more options
1602 	 */
1603 
1604 	struct nouveau_drm *drm = nouveau_drm(dev);
1605 	int i, newentries = 0;
1606 
1607 	for (i = 0; i < dcb->entries; i++) {
1608 		struct dcb_output *ient = &dcb->entry[i];
1609 		int j;
1610 
1611 		for (j = i + 1; j < dcb->entries; j++) {
1612 			struct dcb_output *jent = &dcb->entry[j];
1613 
1614 			if (jent->type == 100) /* already merged entry */
1615 				continue;
1616 
1617 			/* merge heads field when all other fields the same */
1618 			if (jent->i2c_index == ient->i2c_index &&
1619 			    jent->type == ient->type &&
1620 			    jent->location == ient->location &&
1621 			    jent->or == ient->or) {
1622 				NV_INFO(drm, "Merging DCB entries %d and %d\n",
1623 					 i, j);
1624 				ient->heads |= jent->heads;
1625 				jent->type = 100; /* dummy value */
1626 			}
1627 		}
1628 	}
1629 
1630 	/* Compact entries merged into others out of dcb */
1631 	for (i = 0; i < dcb->entries; i++) {
1632 		if (dcb->entry[i].type == 100)
1633 			continue;
1634 
1635 		if (newentries != i) {
1636 			dcb->entry[newentries] = dcb->entry[i];
1637 			dcb->entry[newentries].index = newentries;
1638 		}
1639 		newentries++;
1640 	}
1641 
1642 	dcb->entries = newentries;
1643 }
1644 
1645 static bool
1646 apply_dcb_encoder_quirks(struct drm_device *dev, int idx, u32 *conn, u32 *conf)
1647 {
1648 	struct nouveau_drm *drm = nouveau_drm(dev);
1649 	struct dcb_table *dcb = &drm->vbios.dcb;
1650 
1651 	/* Dell Precision M6300
1652 	 *   DCB entry 2: 02025312 00000010
1653 	 *   DCB entry 3: 02026312 00000020
1654 	 *
1655 	 * Identical, except apparently a different connector on a
1656 	 * different SOR link.  Not a clue how we're supposed to know
1657 	 * which one is in use if it even shares an i2c line...
1658 	 *
1659 	 * Ignore the connector on the second SOR link to prevent
1660 	 * nasty problems until this is sorted (assuming it's not a
1661 	 * VBIOS bug).
1662 	 */
1663 	if (nv_match_device(dev, 0x040d, 0x1028, 0x019b)) {
1664 		if (*conn == 0x02026312 && *conf == 0x00000020)
1665 			return false;
1666 	}
1667 
1668 	/* GeForce3 Ti 200
1669 	 *
1670 	 * DCB reports an LVDS output that should be TMDS:
1671 	 *   DCB entry 1: f2005014 ffffffff
1672 	 */
1673 	if (nv_match_device(dev, 0x0201, 0x1462, 0x8851)) {
1674 		if (*conn == 0xf2005014 && *conf == 0xffffffff) {
1675 			fabricate_dcb_output(dcb, DCB_OUTPUT_TMDS, 1, 1, 1);
1676 			return false;
1677 		}
1678 	}
1679 
1680 	/* XFX GT-240X-YA
1681 	 *
1682 	 * So many things wrong here, replace the entire encoder table..
1683 	 */
1684 	if (nv_match_device(dev, 0x0ca3, 0x1682, 0x3003)) {
1685 		if (idx == 0) {
1686 			*conn = 0x02001300; /* VGA, connector 1 */
1687 			*conf = 0x00000028;
1688 		} else
1689 		if (idx == 1) {
1690 			*conn = 0x01010312; /* DVI, connector 0 */
1691 			*conf = 0x00020030;
1692 		} else
1693 		if (idx == 2) {
1694 			*conn = 0x01010310; /* VGA, connector 0 */
1695 			*conf = 0x00000028;
1696 		} else
1697 		if (idx == 3) {
1698 			*conn = 0x02022362; /* HDMI, connector 2 */
1699 			*conf = 0x00020010;
1700 		} else {
1701 			*conn = 0x0000000e; /* EOL */
1702 			*conf = 0x00000000;
1703 		}
1704 	}
1705 
1706 	/* Some other twisted XFX board (rhbz#694914)
1707 	 *
1708 	 * The DVI/VGA encoder combo that's supposed to represent the
1709 	 * DVI-I connector actually point at two different ones, and
1710 	 * the HDMI connector ends up paired with the VGA instead.
1711 	 *
1712 	 * Connector table is missing anything for VGA at all, pointing it
1713 	 * an invalid conntab entry 2 so we figure it out ourself.
1714 	 */
1715 	if (nv_match_device(dev, 0x0615, 0x1682, 0x2605)) {
1716 		if (idx == 0) {
1717 			*conn = 0x02002300; /* VGA, connector 2 */
1718 			*conf = 0x00000028;
1719 		} else
1720 		if (idx == 1) {
1721 			*conn = 0x01010312; /* DVI, connector 0 */
1722 			*conf = 0x00020030;
1723 		} else
1724 		if (idx == 2) {
1725 			*conn = 0x04020310; /* VGA, connector 0 */
1726 			*conf = 0x00000028;
1727 		} else
1728 		if (idx == 3) {
1729 			*conn = 0x02021322; /* HDMI, connector 1 */
1730 			*conf = 0x00020010;
1731 		} else {
1732 			*conn = 0x0000000e; /* EOL */
1733 			*conf = 0x00000000;
1734 		}
1735 	}
1736 
1737 	/* fdo#50830: connector indices for VGA and DVI-I are backwards */
1738 	if (nv_match_device(dev, 0x0421, 0x3842, 0xc793)) {
1739 		if (idx == 0 && *conn == 0x02000300)
1740 			*conn = 0x02011300;
1741 		else
1742 		if (idx == 1 && *conn == 0x04011310)
1743 			*conn = 0x04000310;
1744 		else
1745 		if (idx == 2 && *conn == 0x02011312)
1746 			*conn = 0x02000312;
1747 	}
1748 
1749 	return true;
1750 }
1751 
1752 static void
1753 fabricate_dcb_encoder_table(struct drm_device *dev, struct nvbios *bios)
1754 {
1755 	struct dcb_table *dcb = &bios->dcb;
1756 	int all_heads = (nv_two_heads(dev) ? 3 : 1);
1757 
1758 #ifdef __powerpc__
1759 	/* Apple iMac G4 NV17 */
1760 	if (of_machine_is_compatible("PowerMac4,5")) {
1761 		fabricate_dcb_output(dcb, DCB_OUTPUT_TMDS, 0, all_heads, 1);
1762 		fabricate_dcb_output(dcb, DCB_OUTPUT_ANALOG, 1, all_heads, 2);
1763 		return;
1764 	}
1765 #endif
1766 
1767 	/* Make up some sane defaults */
1768 	fabricate_dcb_output(dcb, DCB_OUTPUT_ANALOG,
1769 			     bios->legacy.i2c_indices.crt, 1, 1);
1770 
1771 	if (nv04_tv_identify(dev, bios->legacy.i2c_indices.tv) >= 0)
1772 		fabricate_dcb_output(dcb, DCB_OUTPUT_TV,
1773 				     bios->legacy.i2c_indices.tv,
1774 				     all_heads, 0);
1775 
1776 	else if (bios->tmds.output0_script_ptr ||
1777 		 bios->tmds.output1_script_ptr)
1778 		fabricate_dcb_output(dcb, DCB_OUTPUT_TMDS,
1779 				     bios->legacy.i2c_indices.panel,
1780 				     all_heads, 1);
1781 }
1782 
1783 static int
1784 parse_dcb_entry(struct drm_device *dev, void *data, int idx, u8 *outp)
1785 {
1786 	struct nouveau_drm *drm = nouveau_drm(dev);
1787 	struct dcb_table *dcb = &drm->vbios.dcb;
1788 	u32 conf = (dcb->version >= 0x20) ? ROM32(outp[4]) : ROM32(outp[6]);
1789 	u32 conn = ROM32(outp[0]);
1790 	bool ret;
1791 
1792 	if (apply_dcb_encoder_quirks(dev, idx, &conn, &conf)) {
1793 		struct dcb_output *entry = new_dcb_entry(dcb);
1794 
1795 		NV_INFO(drm, "DCB outp %02d: %08x %08x\n", idx, conn, conf);
1796 
1797 		if (dcb->version >= 0x20)
1798 			ret = parse_dcb20_entry(dev, dcb, conn, conf, entry);
1799 		else
1800 			ret = parse_dcb15_entry(dev, dcb, conn, conf, entry);
1801 		if (!ret)
1802 			return 1; /* stop parsing */
1803 
1804 		/* Ignore the I2C index for on-chip TV-out, as there
1805 		 * are cards with bogus values (nv31m in bug 23212),
1806 		 * and it's otherwise useless.
1807 		 */
1808 		if (entry->type == DCB_OUTPUT_TV &&
1809 		    entry->location == DCB_LOC_ON_CHIP)
1810 			entry->i2c_index = 0x0f;
1811 	}
1812 
1813 	return 0;
1814 }
1815 
1816 static void
1817 dcb_fake_connectors(struct nvbios *bios)
1818 {
1819 	struct dcb_table *dcbt = &bios->dcb;
1820 	u8 map[16] = { };
1821 	int i, idx = 0;
1822 
1823 	/* heuristic: if we ever get a non-zero connector field, assume
1824 	 * that all the indices are valid and we don't need fake them.
1825 	 *
1826 	 * and, as usual, a blacklist of boards with bad bios data..
1827 	 */
1828 	if (!nv_match_device(bios->dev, 0x0392, 0x107d, 0x20a2)) {
1829 		for (i = 0; i < dcbt->entries; i++) {
1830 			if (dcbt->entry[i].connector)
1831 				return;
1832 		}
1833 	}
1834 
1835 	/* no useful connector info available, we need to make it up
1836 	 * ourselves.  the rule here is: anything on the same i2c bus
1837 	 * is considered to be on the same connector.  any output
1838 	 * without an associated i2c bus is assigned its own unique
1839 	 * connector index.
1840 	 */
1841 	for (i = 0; i < dcbt->entries; i++) {
1842 		u8 i2c = dcbt->entry[i].i2c_index;
1843 		if (i2c == 0x0f) {
1844 			dcbt->entry[i].connector = idx++;
1845 		} else {
1846 			if (!map[i2c])
1847 				map[i2c] = ++idx;
1848 			dcbt->entry[i].connector = map[i2c] - 1;
1849 		}
1850 	}
1851 
1852 	/* if we created more than one connector, destroy the connector
1853 	 * table - just in case it has random, rather than stub, entries.
1854 	 */
1855 	if (i > 1) {
1856 		u8 *conntab = olddcb_conntab(bios->dev);
1857 		if (conntab)
1858 			conntab[0] = 0x00;
1859 	}
1860 }
1861 
1862 static int
1863 parse_dcb_table(struct drm_device *dev, struct nvbios *bios)
1864 {
1865 	struct nouveau_drm *drm = nouveau_drm(dev);
1866 	struct dcb_table *dcb = &bios->dcb;
1867 	u8 *dcbt, *conn;
1868 	int idx;
1869 
1870 	dcbt = olddcb_table(dev);
1871 	if (!dcbt) {
1872 		/* handle pre-DCB boards */
1873 		if (bios->type == NVBIOS_BMP) {
1874 			fabricate_dcb_encoder_table(dev, bios);
1875 			return 0;
1876 		}
1877 
1878 		return -EINVAL;
1879 	}
1880 
1881 	NV_INFO(drm, "DCB version %d.%d\n", dcbt[0] >> 4, dcbt[0] & 0xf);
1882 
1883 	dcb->version = dcbt[0];
1884 	olddcb_outp_foreach(dev, NULL, parse_dcb_entry);
1885 
1886 	/*
1887 	 * apart for v2.1+ not being known for requiring merging, this
1888 	 * guarantees dcbent->index is the index of the entry in the rom image
1889 	 */
1890 	if (dcb->version < 0x21)
1891 		merge_like_dcb_entries(dev, dcb);
1892 
1893 	/* dump connector table entries to log, if any exist */
1894 	idx = -1;
1895 	while ((conn = olddcb_conn(dev, ++idx))) {
1896 		if (conn[0] != 0xff) {
1897 			if (olddcb_conntab(dev)[3] < 4)
1898 				NV_INFO(drm, "DCB conn %02d: %04x\n",
1899 					idx, ROM16(conn[0]));
1900 			else
1901 				NV_INFO(drm, "DCB conn %02d: %08x\n",
1902 					idx, ROM32(conn[0]));
1903 		}
1904 	}
1905 	dcb_fake_connectors(bios);
1906 	return 0;
1907 }
1908 
1909 static int load_nv17_hwsq_ucode_entry(struct drm_device *dev, struct nvbios *bios, uint16_t hwsq_offset, int entry)
1910 {
1911 	/*
1912 	 * The header following the "HWSQ" signature has the number of entries,
1913 	 * and the entry size
1914 	 *
1915 	 * An entry consists of a dword to write to the sequencer control reg
1916 	 * (0x00001304), followed by the ucode bytes, written sequentially,
1917 	 * starting at reg 0x00001400
1918 	 */
1919 
1920 	struct nouveau_drm *drm = nouveau_drm(dev);
1921 	struct nvif_object *device = &drm->client.device.object;
1922 	uint8_t bytes_to_write;
1923 	uint16_t hwsq_entry_offset;
1924 	int i;
1925 
1926 	if (bios->data[hwsq_offset] <= entry) {
1927 		NV_ERROR(drm, "Too few entries in HW sequencer table for "
1928 				"requested entry\n");
1929 		return -ENOENT;
1930 	}
1931 
1932 	bytes_to_write = bios->data[hwsq_offset + 1];
1933 
1934 	if (bytes_to_write != 36) {
1935 		NV_ERROR(drm, "Unknown HW sequencer entry size\n");
1936 		return -EINVAL;
1937 	}
1938 
1939 	NV_INFO(drm, "Loading NV17 power sequencing microcode\n");
1940 
1941 	hwsq_entry_offset = hwsq_offset + 2 + entry * bytes_to_write;
1942 
1943 	/* set sequencer control */
1944 	nvif_wr32(device, 0x00001304, ROM32(bios->data[hwsq_entry_offset]));
1945 	bytes_to_write -= 4;
1946 
1947 	/* write ucode */
1948 	for (i = 0; i < bytes_to_write; i += 4)
1949 		nvif_wr32(device, 0x00001400 + i, ROM32(bios->data[hwsq_entry_offset + i + 4]));
1950 
1951 	/* twiddle NV_PBUS_DEBUG_4 */
1952 	nvif_wr32(device, NV_PBUS_DEBUG_4, nvif_rd32(device, NV_PBUS_DEBUG_4) | 0x18);
1953 
1954 	return 0;
1955 }
1956 
1957 static int load_nv17_hw_sequencer_ucode(struct drm_device *dev,
1958 					struct nvbios *bios)
1959 {
1960 	/*
1961 	 * BMP based cards, from NV17, need a microcode loading to correctly
1962 	 * control the GPIO etc for LVDS panels
1963 	 *
1964 	 * BIT based cards seem to do this directly in the init scripts
1965 	 *
1966 	 * The microcode entries are found by the "HWSQ" signature.
1967 	 */
1968 
1969 	static const uint8_t hwsq_signature[] = { 'H', 'W', 'S', 'Q' };
1970 	const int sz = sizeof(hwsq_signature);
1971 	int hwsq_offset;
1972 
1973 	hwsq_offset = findstr(bios->data, bios->length, hwsq_signature, sz);
1974 	if (!hwsq_offset)
1975 		return 0;
1976 
1977 	/* always use entry 0? */
1978 	return load_nv17_hwsq_ucode_entry(dev, bios, hwsq_offset + sz, 0);
1979 }
1980 
1981 uint8_t *nouveau_bios_embedded_edid(struct drm_device *dev)
1982 {
1983 	struct nouveau_drm *drm = nouveau_drm(dev);
1984 	struct nvbios *bios = &drm->vbios;
1985 	static const uint8_t edid_sig[] = {
1986 			0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
1987 	uint16_t offset = 0;
1988 	uint16_t newoffset;
1989 	int searchlen = NV_PROM_SIZE;
1990 
1991 	if (bios->fp.edid)
1992 		return bios->fp.edid;
1993 
1994 	while (searchlen) {
1995 		newoffset = findstr(&bios->data[offset], searchlen,
1996 								edid_sig, 8);
1997 		if (!newoffset)
1998 			return NULL;
1999 		offset += newoffset;
2000 		if (!nv_cksum(&bios->data[offset], EDID1_LEN))
2001 			break;
2002 
2003 		searchlen -= offset;
2004 		offset++;
2005 	}
2006 
2007 	NV_INFO(drm, "Found EDID in BIOS\n");
2008 
2009 	return bios->fp.edid = &bios->data[offset];
2010 }
2011 
2012 static bool NVInitVBIOS(struct drm_device *dev)
2013 {
2014 	struct nouveau_drm *drm = nouveau_drm(dev);
2015 	struct nvkm_bios *bios = nvxx_bios(&drm->client.device);
2016 	struct nvbios *legacy = &drm->vbios;
2017 
2018 	memset(legacy, 0, sizeof(struct nvbios));
2019 	spin_lock_init(&legacy->lock);
2020 	legacy->dev = dev;
2021 
2022 	legacy->data = bios->data;
2023 	legacy->length = bios->size;
2024 	legacy->major_version = bios->version.major;
2025 	legacy->chip_version = bios->version.chip;
2026 	if (bios->bit_offset) {
2027 		legacy->type = NVBIOS_BIT;
2028 		legacy->offset = bios->bit_offset;
2029 		return !parse_bit_structure(legacy, legacy->offset + 6);
2030 	} else
2031 	if (bios->bmp_offset) {
2032 		legacy->type = NVBIOS_BMP;
2033 		legacy->offset = bios->bmp_offset;
2034 		return !parse_bmp_structure(dev, legacy, legacy->offset);
2035 	}
2036 
2037 	return false;
2038 }
2039 
2040 int
2041 nouveau_run_vbios_init(struct drm_device *dev)
2042 {
2043 	struct nouveau_drm *drm = nouveau_drm(dev);
2044 	struct nvbios *bios = &drm->vbios;
2045 	int ret = 0;
2046 
2047 	/* Reset the BIOS head to 0. */
2048 	bios->state.crtchead = 0;
2049 
2050 	if (bios->major_version < 5)	/* BMP only */
2051 		load_nv17_hw_sequencer_ucode(dev, bios);
2052 
2053 	if (bios->execute) {
2054 		bios->fp.last_script_invoc = 0;
2055 		bios->fp.lvds_init_run = false;
2056 	}
2057 
2058 	return ret;
2059 }
2060 
2061 static bool
2062 nouveau_bios_posted(struct drm_device *dev)
2063 {
2064 	struct nouveau_drm *drm = nouveau_drm(dev);
2065 	unsigned htotal;
2066 
2067 	if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA)
2068 		return true;
2069 
2070 	htotal  = NVReadVgaCrtc(dev, 0, 0x06);
2071 	htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x01) << 8;
2072 	htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x20) << 4;
2073 	htotal |= (NVReadVgaCrtc(dev, 0, 0x25) & 0x01) << 10;
2074 	htotal |= (NVReadVgaCrtc(dev, 0, 0x41) & 0x01) << 11;
2075 	return (htotal != 0);
2076 }
2077 
2078 int
2079 nouveau_bios_init(struct drm_device *dev)
2080 {
2081 	struct nouveau_drm *drm = nouveau_drm(dev);
2082 	struct nvbios *bios = &drm->vbios;
2083 	int ret;
2084 
2085 	/* only relevant for PCI devices */
2086 	if (!dev->pdev)
2087 		return 0;
2088 
2089 	if (!NVInitVBIOS(dev))
2090 		return -ENODEV;
2091 
2092 	ret = parse_dcb_table(dev, bios);
2093 	if (ret)
2094 		return ret;
2095 
2096 	if (!bios->major_version)	/* we don't run version 0 bios */
2097 		return 0;
2098 
2099 	/* init script execution disabled */
2100 	bios->execute = false;
2101 
2102 	/* ... unless card isn't POSTed already */
2103 	if (!nouveau_bios_posted(dev)) {
2104 		NV_INFO(drm, "Adaptor not initialised, "
2105 			"running VBIOS init tables.\n");
2106 		bios->execute = true;
2107 	}
2108 
2109 	ret = nouveau_run_vbios_init(dev);
2110 	if (ret)
2111 		return ret;
2112 
2113 	/* feature_byte on BMP is poor, but init always sets CR4B */
2114 	if (bios->major_version < 5)
2115 		bios->is_mobile = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_4B) & 0x40;
2116 
2117 	/* all BIT systems need p_f_m_t for digital_min_front_porch */
2118 	if (bios->is_mobile || bios->major_version >= 5)
2119 		ret = parse_fp_mode_table(dev, bios);
2120 
2121 	/* allow subsequent scripts to execute */
2122 	bios->execute = true;
2123 
2124 	return 0;
2125 }
2126 
2127 void
2128 nouveau_bios_takedown(struct drm_device *dev)
2129 {
2130 }
2131