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path: root/common/edid-decode.c
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/*
 * Copyright 2006-2015 Red Hat, Inc. and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Author: Adam Jackson <ajax@nwnk.net> and contributors
 *
 * This driver has been modified to support ODROID-C1/C2.
 *   Modified by Joy Cho <joy.cho@hardkernel.com>
 */

#include <linux/types.h>
#include <linux/stat.h>
#include <linux/ctype.h>
#include <common.h>
#include <malloc.h>
#include <fs.h>

#undef DEBUG_EDID

#ifdef  DEBUG_EDID
# define DEBUGF(fmt, args...)	printf(fmt ,##args)
#else
# define DEBUGF(fmt, args...)
#endif

static int claims_one_point_oh = 0;
static int claims_one_point_two = 0;
static int claims_one_point_three = 0;
static int claims_one_point_four = 0;
static int nonconformant_digital_display = 0;
static int nonconformant_extension = 0;
static int did_detailed_timing = 0;
static int has_name_descriptor = 0;
static int name_descriptor_terminated = 0;
static int has_range_descriptor = 0;
static int has_preferred_timing = 0;
static int has_valid_checksum = 1;
static int has_valid_cvt = 1;
static int has_valid_dummy_block = 1;
static int has_valid_week = 0;
static int has_valid_year = 0;
static int has_valid_detailed_blocks = 0;
static int has_valid_extension_count = 0;
static int has_valid_descriptor_ordering = 1;
static int has_valid_descriptor_pad = 1;
static int has_valid_range_descriptor = 1;
static int has_valid_max_dotclock = 1;
static int has_valid_string_termination = 1;
static int manufacturer_name_well_formed = 0;
static int seen_non_detailed_descriptor = 0;

static int warning_excessive_dotclock_correction = 0;
static int warning_zero_preferred_refresh = 0;

static int conformant = 1;

struct value {
	int value;
	const char *description;
};

struct field {
	const char *name;
	int start, end;
	struct value *values;
	int n_values;
};

#define DEFINE_FIELD(n, var, s, e, ...)				\
	static struct value var##_values[] =  {			\
		__VA_ARGS__					\
	};							\
static struct field var = {					\
	.name = n,						\
	.start = s,		        			\
	.end = e,						\
	.values = var##_values,	        			\
	.n_values = ARRAY_SIZE(var##_values),			\
}

struct timing_info {
	int width;
	int height;
	int refresh;
	int scanmode; /* progress 1, interlaced 0 */
};

struct detailed_timing_info {
	int width;
	int height;
	int pclk; /* in kHz unit */

	int hdisp;
	int hsyncstart;
	int hsyncend;
	int htotal;

	int vdisp;
	int vsyncstart;
	int vsyncend;
	int vtotal;

	int hsync_flag; /* 1 '+' , 0 '-' */
	int vsync_flag;

	int scanmode; /* progress 1, interlaced 0 */
};

/* max established timings : 17 */
struct timing_info established_timings[17];
static int established_cnt;
/* max standard timings : 8 */
struct timing_info standard_timings[8];
static int standard_cnt;
/* max detailed mode array : 4 * 2 (extension) */
struct detailed_timing_info detailed_timings[8];
static int detailed_cnt;

static unsigned int IEEEOUI;
static unsigned int extended_tag;
static char bestmode[20];
static char result[120];
static const char *c2_support_modes[] = {
	"480cvbs",
	"576cvbs",
	"480i60hz",
	"480p60hz",
	"576i50hz",
	"576p50hz",
	"720p60hz",
	"720p50hz",
	"1080p60hz",
	"1080p50hz",
	"1080p30hz",
	"1080p24hz",
	"1080i60hz",
	"1080i50hz",
	"2160p60hz",
	"2160p50hz",
	"2160p30hz",
	"2160p25hz",
	"2160p24hz",
	"2160p60hz420",
	"2160p50hz420",
	"640x480p60hz",
	"800x480p60hz",
	"800x600p60hz",
	"1024x600p60hz",
	"1024x768p60hz",
	"1280x800p60hz",
	"1280x1024p60hz",
	"1360x768p60hz",
	"1440x900p60hz",
	"1600x900p60hz",
	"1600x1200p60hz",
	"1680x1050p60hz",
	"1920x1200p60hz",
	"2560x1600p60hz",
	"2560x1440p60hz",
	"2560x1080p60hz",
	"3440x1440p60hz",
};

static void
decode_value(struct field *field, int val, const char *prefix)
{
	struct value *v;
	int i;

	for (i = 0; i < field->n_values; i++) {
		v = &field->values[i];

		if (v->value == val)
			break;
	}

	if (i == field->n_values) {
		printf("%s%s: %d\n", prefix, field->name, val);
		return;
	}

	printf("%s%s: (%d)\n", prefix, field->name, val);
}

static void
_decode(struct field **fields, int n_fields, int data, const char *prefix)
{
	int i;

	for (i = 0; i < n_fields; i++) {
		struct field *f = fields[i];
		int field_length = f->end - f->start + 1;
		int val;

		if (field_length == 32)
			val = data;
		else
			val = (data >> f->start) & ((1 << field_length) - 1);

		decode_value(f, val, prefix);
	}
}

#define decode(fields, data, prefix)    \
	_decode(fields, ARRAY_SIZE(fields), data, prefix)

static char *manufacturer_name(unsigned char *x)
{
	static char name[4];

	name[0] = ((x[0] & 0x7C) >> 2) + '@';
	name[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@';
	name[2] = (x[1] & 0x1F) + '@';
	name[3] = 0;

	if (isupper(name[0]) && isupper(name[1]) && isupper(name[2]))
		manufacturer_name_well_formed = 1;

	return name;
}

static int
detailed_cvt_descriptor(unsigned char *x, int first)
{
	const unsigned char empty[3] = { 0, 0, 0 };
	char *names[] = { "50", "60", "75", "85" };
	int width, height;
	int valid = 1;
	int fifty = 0, sixty = 0, seventyfive = 0, eightyfive = 0, reduced = 0;

	if (!first && !memcmp(x, empty, 3))
		return valid;

	height = x[0];
	height |= (x[1] & 0xf0) << 4;
	height++;
	height *= 2;

	switch (x[1] & 0x0c) {
	case 0x00:
		width = (height * 4) / 3;
		break;
	case 0x04:
		width = (height * 16) / 9;
		break;
	case 0x08:
		width = (height * 16) / 10;
		break;
	case 0x0c:
		width = (height * 15) / 9;
		break;
	/* default 16:9 */
	default:
		width = (height * 16) / 9;
		break;
	}

	if (x[1] & 0x03)
		valid = 0;
	if (x[2] & 0x80)
		valid = 0;
	if (!(x[2] & 0x1f))
		valid = 0;

	fifty	= (x[2] & 0x10);
	sixty	= (x[2] & 0x08);
	seventyfive = (x[2] & 0x04);
	eightyfive  = (x[2] & 0x02);
	reduced	= (x[2] & 0x01);

	if (!valid) {
		printf("    (broken)\n");
	} else {
		printf("    %dx%d @ ( %s%s%s%s%s) Hz (%s%s preferred)\n", width, height,
				fifty ? "50 " : "",
				sixty ? "60 " : "",
				seventyfive ? "75 " : "",
				eightyfive ? "85 " : "",
				reduced ? "60RB " : "",
				names[(x[2] & 0x60) >> 5],
				(((x[2] & 0x60) == 0x20) && reduced) ? "RB" : "");
	}

	return valid;
}

/* extract a string from a detailed subblock, checking for termination */
static char *
extract_string(unsigned char *x, int *valid_termination, int len)
{
	static char ret[128];
	int i, seen_newline = 0;

	memset(ret, 0, sizeof(ret));

	for (i = 0; i < len; i++) {
		if (seen_newline) {
			if (x[i] != 0x20) {
				*valid_termination = 0;
				return ret;
			}
		} else {
			if (x[i] == 0x0a) {
				seen_newline = 1;
			} else {
				if (((x[i] & 0x80) == 0) && isprint(x[i])) {
					ret[i] = x[i];
				} else {
					*valid_termination = 0;
					return ret;
				}
			}
		}
	}
	return ret;
}

/* 1 means valid data */
static int
detailed_block(unsigned char *x, int in_extension)
{
	static unsigned char name[53];
	int ha, hbl, hso, hspw, hborder, va, vbl, vso, vspw, vborder;
	int i;
	char phsync, pvsync, *syncmethod, *stereo;

	if (x[0] == 0 && x[1] == 0) {
		/* Monitor descriptor block, not detailed timing descriptor. */
		if (x[2] != 0) {
			/* 1.3, 3.10.3 */
			printf("Monitor descriptor block has byte 2 nonzero (0x%02x)\n",
					x[2]);
			has_valid_descriptor_pad = 0;
		}
		if (x[3] != 0xfd && x[4] != 0x00) {
			/* 1.3, 3.10.3 */
			printf("Monitor descriptor block has byte 4 nonzero (0x%02x)\n",
					x[4]);
			has_valid_descriptor_pad = 0;
		}

		seen_non_detailed_descriptor = 1;
		if (x[3] <= 0xF) {
			/*
			 * in principle we can decode these, if we know what they are.
			 * 0x0f seems to be common in laptop panels.
			 * 0x0e is used by EPI: http://www.epi-standard.org/
			 */
			printf("Manufacturer-specified data, tag %d\n", x[3]);
			return 1;
		}
		switch (x[3]) {
		case 0x10:
			printf("Dummy block\n");
			for (i = 5; i < 18; i++)
				if (x[i] != 0x00)
					has_valid_dummy_block = 0;
			return 1;
		case 0xF7:
			/* TODO */
			printf("Established timings III\n");
			return 1;
		case 0xF8:
		{
			int valid_cvt = 1; /* just this block */
			printf("CVT 3-byte code descriptor:\n");
			if (x[5] != 0x01) {
				has_valid_cvt = 0;
				return 0;
			}
			for (i = 0; i < 4; i++)
				valid_cvt &= detailed_cvt_descriptor(x + 6 + (i * 3), (i == 0));
			has_valid_cvt &= valid_cvt;
			return valid_cvt;
		}
		case 0xF9:
			/* TODO */
			printf("Color management data\n");
			return 1;
		case 0xFA:
			/* TODO */
			printf("More standard timings\n");
			return 1;
		case 0xFB:
			/* TODO */
			printf("Color point\n");
			return 1;
		case 0xFC:
			/* XXX should check for spaces after the \n */
			/* XXX check: terminated with 0x0A, padded with 0x20 */
			has_name_descriptor = 1;
			if (strchr((char *)name, '\n')) return 1;
			strncat((char *)name, (char *)x + 5, 13);
			if (strchr((char *)name, '\n')) {
				name_descriptor_terminated = 1;
				printf("Monitor name: %s\n",
					extract_string(name, &has_valid_string_termination,
					strlen((char *)name)));
			}
			return 1;
		case 0xFD:
		{
			int h_max_offset = 0, h_min_offset = 0;
			int v_max_offset = 0, v_min_offset = 0;
			int is_cvt = 0;
			has_range_descriptor = 1;
			char *range_class = "";
			/*
			 * XXX todo: implement feature flags, vtd blocks
			 * XXX check: ranges are well-formed; block termination if no vtd
			 */
			if (claims_one_point_four) {
				if (x[4] & 0x02) {
					v_max_offset = 255;
					if (x[4] & 0x01) {
						v_min_offset = 255;
					}
				}
				if (x[4] & 0x04) {
					h_max_offset = 255;
					if (x[4] & 0x03) {
						h_min_offset = 255;
					}
				}
			} else if (x[4]) {
				has_valid_range_descriptor = 0;
			}

			/*
			 * despite the values, this is not a bitfield.
			 */
			switch (x[10]) {
			case 0x00: /* default gtf */
				range_class = "GTF";
				break;
			case 0x01: /* range limits only */
				range_class = "bare limits";
				if (!claims_one_point_four)
					has_valid_range_descriptor = 0;
				break;
			case 0x02: /* secondary gtf curve */
				range_class = "GTF with icing";
				break;
			case 0x04: /* cvt */
				range_class = "CVT";
				is_cvt = 1;
				if (!claims_one_point_four)
					has_valid_range_descriptor = 0;
				break;
			default: /* invalid */
				has_valid_range_descriptor = 0;
				range_class = "invalid";
				break;
			}

			if (x[5] + v_min_offset > x[6] + v_max_offset)
				has_valid_range_descriptor = 0;
			if (x[7] + h_min_offset > x[8] + h_max_offset)
				has_valid_range_descriptor = 0;
			printf("Monitor ranges (%s): %d-%dHz V, %d-%dkHz H",
					range_class,
					x[5] + v_min_offset, x[6] + v_max_offset,
					x[7] + h_min_offset, x[8] + h_max_offset);
			if (x[9])
				printf(", max dotclock %dMHz\n", x[9] * 10);
			else {
				if (claims_one_point_four)
					has_valid_max_dotclock = 0;
				printf("\n");
			}

			if (is_cvt) {
				int max_h_pixels = 0;

				printf("CVT version %d.%d\n", x[11] & 0xf0 >> 4, x[11] & 0x0f);

				if (x[12] & 0xfc) {
					int raw_offset = (x[12] & 0xfc) >> 2;
					printf("Real max dotclock: %.2fMHz\n",
						(x[9] * 10) - (raw_offset * 0.25));
					if (raw_offset >= 40)
						warning_excessive_dotclock_correction = 1;
				}

				max_h_pixels = x[12] & 0x03;
				max_h_pixels <<= 8;
				max_h_pixels |= x[13];
				max_h_pixels *= 8;
				if (max_h_pixels)
					printf("Max active pixels per line: %d\n", max_h_pixels);

				printf("Supported aspect ratios: %s %s %s %s %s\n",
					x[14] & 0x80 ? "4:3" : "",
					x[14] & 0x40 ? "16:9" : "",
					x[14] & 0x20 ? "16:10" : "",
					x[14] & 0x10 ? "5:4" : "",
					x[14] & 0x08 ? "15:9" : "");
				if (x[14] & 0x07)
					has_valid_range_descriptor = 0;

				printf("Preferred aspect ratio: ");
				switch((x[15] & 0xe0) >> 5) {
					case 0x00: printf("4:3"); break;
					case 0x01: printf("16:9"); break;
					case 0x02: printf("16:10"); break;
					case 0x03: printf("5:4"); break;
					case 0x04: printf("15:9"); break;
					default: printf("(broken)"); break;
				}
				printf("\n");

				if (x[15] & 0x04)
					printf("Supports CVT standard blanking\n");
				if (x[15] & 0x10)
					printf("Supports CVT reduced blanking\n");

				if (x[15] & 0x07)
					has_valid_range_descriptor = 0;

				if (x[16] & 0xf0) {
					printf("Supported display scaling:\n");
					if (x[16] & 0x80)
						printf("    Horizontal shrink\n");
					if (x[16] & 0x40)
						printf("    Horizontal stretch\n");
					if (x[16] & 0x20)
						printf("    Vertical shrink\n");
					if (x[16] & 0x10)
						printf("    Vertical stretch\n");
				}

				if (x[16] & 0x0f)
					has_valid_range_descriptor = 0;

				if (x[17])
					printf("Preferred vertical refresh: %d Hz\n", x[17]);
				else
					warning_zero_preferred_refresh = 1;
			}

			/*
			 * Slightly weird to return a global, but I've never seen any
			 * EDID block wth two range descriptors, so it's harmless.
			 */
			return has_valid_range_descriptor;
		}
		case 0xFE:
			/*
			 * TODO: Two of these in a row, in the third and fourth slots,
			 * seems to be specified by SPWG: http://www.spwg.org/
			 */
			printf("ASCII string: %s\n",
				extract_string(x + 5, &has_valid_string_termination, 13));
			return 1;
		case 0xFF:
			printf("Serial number: %s\n",
				extract_string(x + 5, &has_valid_string_termination, 13));
			return 1;
		default:
			printf("Unknown monitor description type %d\n", x[3]);
			return 0;
		}
	}

	if (seen_non_detailed_descriptor && !in_extension) {
		has_valid_descriptor_ordering = 0;
	}

	did_detailed_timing = 1;
	ha = (x[2] + ((x[4] & 0xF0) << 4));
	hbl = (x[3] + ((x[4] & 0x0F) << 8));
	hso = (x[8] + ((x[11] & 0xC0) << 2));
	hspw = (x[9] + ((x[11] & 0x30) << 4));
	hborder = x[15];
	va = (x[5] + ((x[7] & 0xF0) << 4));
	vbl = (x[6] + ((x[7] & 0x0F) << 8));
	vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2));
	vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4));
	vborder = x[16];

	switch ((x[17] & 0x18) >> 3) {
	case 0x00:
		syncmethod = " analog composite";
		break;
	case 0x01:
		syncmethod = " bipolar analog composite";
		break;
	case 0x02:
		syncmethod = " digital composite";
		break;
	case 0x03:
		syncmethod = "";
		break;
	}

	pvsync = (x[17] & (1 << 2)) ? '+' : '-';
	phsync = (x[17] & (1 << 1)) ? '+' : '-';

	switch (x[17] & 0x61) {
	case 0x20:
		stereo = "field sequential L/R";
		break;
	case 0x40:
		stereo = "field sequential R/L";
		break;
	case 0x21:
		stereo = "interleaved right even";
		break;
	case 0x41:
		stereo = "interleaved left even";
		break;
	case 0x60:
		stereo = "four way interleaved";
		break;
	case 0x61:
		stereo = "side by side interleaved";
		break;
	default:
		stereo = "";
		break;
	}

	printf("Detailed mode (1) : Clock %d MHz, %d mm x %d mm\n"
		"               %4d %4d %4d %4d hborder %d\n"
		"               %4d %4d %4d %4d vborder %d\n"
		"               %chsync %cvsync%s%s %s\n",
		((x[0] + (x[1] << 8)) / 100),
		(x[12] + ((x[14] & 0xF0) << 4)),
		(x[13] + ((x[14] & 0x0F) << 8)),
		ha, ha + hso, ha + hso + hspw, ha + hbl, hborder,
		va, va + vso, va + vso + vspw, va + vbl, vborder,
		phsync, pvsync, syncmethod, x[17] & 0x80 ? " interlaced" : "",
		stereo
	);

	/* detailed timings in extension block will be excluded
	 * from candidates to find the best mode.
	 */
	if (!in_extension) {
		detailed_timings[detailed_cnt].width = ha;
		detailed_timings[detailed_cnt].height = va;
		detailed_timings[detailed_cnt].pclk = ((x[0] + (x[1] << 8)) * 10);
		detailed_timings[detailed_cnt].hdisp = ha;
		detailed_timings[detailed_cnt].hsyncstart = ha + hso;
		detailed_timings[detailed_cnt].hsyncend = ha + hso + hspw;
		detailed_timings[detailed_cnt].htotal = ha + hbl;
		detailed_timings[detailed_cnt].vdisp = va;
		detailed_timings[detailed_cnt].vsyncstart = va + vso;
		detailed_timings[detailed_cnt].vsyncend = va + vso + vspw;
		detailed_timings[detailed_cnt].vtotal = va + vbl;
		detailed_timings[detailed_cnt].hsync_flag = ((x[17] & (1 << 1)) >> 1) ;
		detailed_timings[detailed_cnt].vsync_flag = ((x[17] & (1 << 2)) >> 2);
		detailed_timings[detailed_cnt].scanmode = ((x[17] & 0x80) >> 7) ? 0 : 1;

		detailed_cnt++;
	}

	/* XXX flag decode */

	return 1;
}

static void
do_checksum(unsigned char *x)
{
	printf("Checksum: 0x%hx", x[0x7f]);
	{
		unsigned char sum = 0;
		int i;
		for (i = 0; i < 128; i++)
			sum += x[i];
		if (sum) {
			printf(" (should be 0x%hx)", (unsigned char)(x[0x7f] - sum));
			has_valid_checksum = 0;
		} else printf(" (valid)");
	}
	printf("\n");
}

/* CEA extension */
static const char *
audio_format(unsigned char x)
{
	switch (x) {
	case 0: return "RESERVED";
	case 1: return "Linear PCM";
	case 2: return "AC-3";
	case 3: return "MPEG 1 (Layers 1 & 2)";
	case 4: return "MPEG 1 Layer 3 (MP3)";
	case 5: return "MPEG2 (multichannel)";
	case 6: return "AAC";
	case 7: return "DTS";
	case 8: return "ATRAC";
	case 9: return "One Bit Audio";
	case 10: return "Dolby Digital+";
	case 11: return "DTS-HD";
	case 12: return "MAT (MLP)";
	case 13: return "DST";
	case 14: return "WMA Pro";
	case 15: return "RESERVED";
	}
	return "BROKEN"; /* can't happen */
}

static void
cea_audio_block(unsigned char *x)
{
	int i, format;
	int length = x[0] & 0x1f;

	if (length % 3) {
		printf("Broken CEA audio block length %d\n", length);
		/* XXX non-conformant */
		return;
	}

	for (i = 1; i < length; i += 3) {
		format = (x[i] & 0x78) >> 3;
		printf("    %s, max channels %d\n", audio_format(format),
			(x[i] & 0x07)+1);
		DEBUGF("    Supported sample rates (kHz):%s%s%s%s%s%s%s\n",
			(x[i+1] & 0x40) ? " 192" : "",
			(x[i+1] & 0x20) ? " 176.4" : "",
			(x[i+1] & 0x10) ? " 96" : "",
			(x[i+1] & 0x08) ? " 88.2" : "",
			(x[i+1] & 0x04) ? " 48" : "",
			(x[i+1] & 0x02) ? " 44.1" : "",
			(x[i+1] & 0x01) ? " 32" : "");
		if (format == 1) {
			DEBUGF("    Supported sample sizes (bits):%s%s%s\n",
				(x[i+2] & 0x04) ? " 24" : "",
				(x[i+2] & 0x02) ? " 20" : "",
				(x[i+2] & 0x01) ? " 16" : "");
		} else if (format <= 8) {
			DEBUGF("    Maximum bit rate: %d kbit/s\n", x[i+2] * 8);
		}
	}
}

/* https://en.wikipedia.org/wiki/Extended_Display_Identification_Data#EIA.2FCEA-861_extension_block */
static const char *edid_cea_modes[] = {
	"640x480@60Hz",
	"720x480@60Hz",
	"720x480@60Hz",
	"1280x720@60Hz",
	"1920x1080i@60Hz",
	"1440x480i@60Hz",
	"1440x480i@60Hz",
	"1440x240@60Hz",
	"1440x240@60Hz",
	"2880x480i@60Hz",
	"2880x480i@60Hz",
	"2880x240@60Hz",
	"2880x240@60Hz",
	"1440x480@60Hz",
	"1440x480@60Hz",
	"1920x1080@60Hz",
	"720x576@50Hz",
	"720x576@50Hz",
	"1280x720@50Hz",
	"1920x1080i@50Hz",
	"1440x576i@50Hz",
	"1440x576i@50Hz",
	"1440x288@50Hz",
	"1440x288@50Hz",
	"2880x576i@50Hz",
	"2880x576i@50Hz",
	"2880x288@50Hz",
	"2880x288@50Hz",
	"1440x576@50Hz",
	"1440x576@50Hz",
	"1920x1080@50Hz",
	"1920x1080@24Hz",
	"1920x1080@25Hz",
	"1920x1080@30Hz",
	"2880x480@60Hz",
	"2880x480@60Hz",
	"2880x576@50Hz",
	"2880x576@50Hz",
	"1920x1080i@50Hz",
	"1920x1080i@100Hz",
	"1280x720@100Hz",
	"720x576@100Hz",
	"720x576@100Hz",
	"1440x576@100Hz",
	"1440x576@100Hz",
	"1920x1080i@120Hz",
	"1280x720@120Hz",
	"720x480@120Hz",
	"720x480@120Hz",
	"1440x480i@120Hz",
	"1440x480i@120Hz",
	"720x576@200Hz",
	"720x576@200Hz",
	"1440x576i@200Hz",
	"1440x576i@200Hz",
	"720x480@240Hz",
	"720x480@240Hz",
	"1440x480i@240Hz",
	"1440x480i@240Hz",
	"1280x720@24Hz",
	"1280x720@25Hz",
	"1280x720@30Hz",
	"1920x1080@120Hz",
	"1920x1080@100Hz",
	"1280x720@24Hz",
	"1280x720@25Hz",
	"1280x720@30Hz",
	"1280x720@50Hz",
	"1280x720@60Hz",
	"1280x720@100Hz",
	"1280x720@120Hz",
	"1920x1080@24Hz",
	"1920x1080@25Hz",
	"1920x1080@30Hz",
	"1920x1080@50Hz",
	"1920x1080@60Hz",
	"1920x1080@100Hz",
	"1920x1080@120Hz",
	"1680x720@24Hz",
	"1680x720@25Hz",
	"1680x720@30Hz",
	"1680x720@50Hz",
	"1680x720@60Hz",
	"1680x720@100Hz",
	"1680x720@120Hz",
	"2560x1080@24Hz",
	"2560x1080@25Hz",
	"2560x1080@30Hz",
	"2560x1080@50Hz",
	"2560x1080@60Hz",
	"2560x1080@100Hz",
	"2560x1080@120Hz",
	"3840x2160@24Hz",
	"3840x2160@25Hz",
	"3840x2160@30Hz",
	"3840x2160@50Hz",
	"3840x2160@60Hz",
	"4096x2160@24Hz",
	"4096x2160@25Hz",
	"4096x2160@30Hz",
	"4096x2160@50Hz",
	"4096x2160@60Hz",
	"3840x2160@24Hz",
	"3840x2160@25Hz",
	"3840x2160@30Hz",
	"3840x2160@50Hz",
	"3840x2160@60Hz",
};

static void
cea_svd(unsigned char *x, int n)
{
	int i;

	for (i = 0; i < n; i++)  {
		unsigned char svd = x[i];
		unsigned char native;
		unsigned char vic;
		const char *mode;

		if ((svd & 0x7f) == 0)
			continue;

		if ((svd - 1) & 0x40) {
			vic = svd;
			native = 0;
		} else {
			vic = svd & 0x7f;
			native = svd & 0x80;
		}

		if (vic > 0 && vic <= ARRAY_SIZE(edid_cea_modes))
			mode = edid_cea_modes[vic - 1];
		else
			mode = "Unknown mode";

		printf("    VIC %3d %s %s\n", vic, mode, native ? "(native)" : "");
	}
}

static void
cea_video_block(unsigned char *x)
{
	int length = x[0] & 0x1f;

	cea_svd(x + 1, length);
}

static void
cea_y420vdb(unsigned char *x)
{
	int length = x[0] & 0x1f;

	cea_svd(x + 2, length - 1);
}

static void
cea_vfpdb(unsigned char *x)
{
	int length = x[0] & 0x1f;
	int i;

	for (i = 2; i <= length; i++)  {
		unsigned char svr = x[i];

		if ((svr > 0 && svr < 128) || (svr > 192 && svr < 254)) {
			unsigned char vic;
			const char *mode;
			int index;

			vic = svr;
			index = vic - 1;

			if (index < ARRAY_SIZE(edid_cea_modes))
				mode = edid_cea_modes[vic];
			else
				mode = "Unknown mode";

			printf("    VIC %02d %s\n", vic, mode);

		} else if (svr > 128 && svr < 145) {
			printf("    DTD number %02d\n", svr - 128);
		}
	}
}

static const char *edid_cea_hdmi_modes[] = {
	"3840x2160@30Hz",
	"3840x2160@25Hz",
	"3840x2160@24Hz",
	"4096x2160@24Hz",
};

static void
cea_hdmi_block(unsigned char *x)
{
	int length = x[0] & 0x1f;

	printf(" (HDMI)\n");
	DEBUGF("    Source physical address %d.%d.%d.%d\n", x[4] >> 4, x[4] & 0x0f,
			x[5] >> 4, x[5] & 0x0f);

	if (length > 5) {
		if (x[6] & 0x80)
			printf("    Supports_AI\n");
		if (x[6] & 0x40)
			printf("    DC_48bit\n");
		if (x[6] & 0x20)
			printf("    DC_36bit\n");
		if (x[6] & 0x10)
			printf("    DC_30bit\n");
		if (x[6] & 0x08)
			printf("    DC_Y444\n");
		/* two reserved */
		if (x[6] & 0x01)
			printf("    DVI_Dual\n");
	}

	if (length > 6)
		printf("    Maximum TMDS clock: %dMHz\n", x[7] * 5);

	/* XXX the walk here is really ugly, and needs to be length-checked */
	if (length > 7) {
		int b = 0;

		if (x[8] & 0x80) {
			printf("    Video latency: %d\n", x[9 + b]);
			printf("    Audio latency: %d\n", x[10 + b]);
			b += 2;
		}

		if (x[8] & 0x40) {
			printf("    Interlaced video latency: %d\n", x[9 + b]);
			printf("    Interlaced audio latency: %d\n", x[10 + b]);
			b += 2;
		}

		if (x[8] & 0x20) {
			int mask = 0, formats = 0;
			int len_vic, len_3d;
			printf("    Extended HDMI video details:\n");
			if (x[9 + b] & 0x80)
				printf("      3D present\n");
			if ((x[9 + b] & 0x60) == 0x20) {
				printf("      All advertised VICs are 3D-capable\n");
				formats = 1;
			}
			if ((x[9 + b] & 0x60) == 0x40) {
				printf("      3D-capable-VIC mask present\n");
				formats = 1;
				mask = 1;
			}
			switch (x[9 + b] & 0x18) {
			case 0x00: break;
			case 0x08:
				   printf("      Base EDID image size is aspect ratio\n");
				   break;
			case 0x10:
				   printf("      Base EDID image size is in units of 1cm\n");
				   break;
			case 0x18:
				   printf("      Base EDID image size is in units of 5cm\n");
				   break;
			}
			len_vic = (x[10 + b] & 0xe0) >> 5;
			len_3d = (x[10 + b] & 0x1f) >> 0;
			b += 2;

			if (len_vic) {
				int i;

				for (i = 0; i < len_vic; i++) {
					unsigned char vic = x[9 + b + i];
					const char *mode;

					vic--;
					if (vic < ARRAY_SIZE(edid_cea_hdmi_modes))
						mode = edid_cea_hdmi_modes[vic];
					else
						mode = "Unknown mode";

					printf("      HDMI VIC %d %s\n", vic, mode);
				}

				b += len_vic;
			}

			if (len_3d) {
				if (formats) {
					/* 3D_Structure_ALL_15..8 */
					if (x[9 + b] & 0x80)
						printf("      3D: Side-by-side (half, quincunx)\n");
					if (x[9 + b] & 0x01)
						printf("      3D: Side-by-side (half, horizontal)\n");
					/* 3D_Structure_ALL_7..0 */
					if (x[10 + b] & 0x40)
						printf("      3D: Top-and-bottom\n");
					if (x[10 + b] & 0x20)
						printf("      3D: L + depth + gfx + gfx-depth\n");
					if (x[10 + b] & 0x10)
						printf("      3D: L + depth\n");
					if (x[10 + b] & 0x08)
						printf("      3D: Side-by-side (full)\n");
					if (x[10 + b] & 0x04)
						printf("      3D: Line-alternative\n");
					if (x[10 + b] & 0x02)
						printf("      3D: Field-alternative\n");
					if (x[10 + b] & 0x01)
						printf("      3D: Frame-packing\n");
					b += 2;
					len_3d -= 2;
				}
				if (mask) {
					int i;
					printf("      3D VIC indices:");
					/* worst bit ordering ever */
					for (i = 0; i < 8; i++)
						if (x[10 + b] & (1 << i))
							printf(" %d", i);
					for (i = 0; i < 8; i++)
						if (x[9 + b] & (1 << i))
							printf(" %d", i + 8);
					printf("\n");
					b += 2;
					len_3d -= 2;
				}

				/*
				 * list of nibbles:
				 * 2D_VIC_Order_X
				 * 3D_Structure_X
				 * (optionally: 3D_Detail_X and reserved)
				 */
				if (len_3d > 0) {
					int end = b + len_3d;

					while (b < end) {
						printf("      VIC index %d supports ", x[9 + b] >> 4);
						switch (x[9 + b] & 0x0f) {
							case 0: printf("frame packing"); break;
							case 6: printf("top-and-bottom"); break;
							case 8:
								if ((x[10 + b] >> 4) == 1) {
									printf("side-by-side (half, horizontal)");
									break;
								}
							default: printf("unknown");
						}
						printf("\n");

						if ((x[9 + b] & 0x0f) > 7) {
							/* Optional 3D_Detail_X and reserved */
							b++;
						}
						b++;
					}
				}

			}

		}
	}
}

DEFINE_FIELD("YCbCr quantization", YCbCr_quantization, 7, 7,
		{ 0, "No Data" },
		{ 1, "Selectable (via AVI YQ)" });
DEFINE_FIELD("RGB quantization", RGB_quantization, 6, 6,
		{ 0, "No Data" },
		{ 1, "Selectable (via AVI Q)" });
DEFINE_FIELD("PT scan behaviour", PT_scan, 4, 5,
		{ 0, "No Data" },
		{ 1, "Always Overscannned" },
		{ 2, "Always Underscanned" },
		{ 3, "Support both over- and underscan" });
DEFINE_FIELD("IT scan behaviour", IT_scan, 2, 3,
		{ 0, "IT video formats not supported" },
		{ 1, "Always Overscannned" },
		{ 2, "Always Underscanned" },
		{ 3, "Support both over- and underscan" });
DEFINE_FIELD("CE scan behaviour", CE_scan, 0, 1,
		{ 0, "CE video formats not supported" },
		{ 1, "Always Overscannned" },
		{ 2, "Always Underscanned" },
		{ 3, "Support both over- and underscan" });

static struct field *vcdb_fields[] = {
	&YCbCr_quantization,
	&RGB_quantization,
	&PT_scan,
	&IT_scan,
	&CE_scan,
};

static const char *sadb_map[] = {
	"FL/FR",
	"LFE",
	"FC",
	"RL/RR",
	"RC",
	"FLC/FRC",
	"RLC/RRC",
	"FLW/FRW",
	"FLH/FRH",
	"TC",
	"FCH",
};

static void
cea_sadb(unsigned char *x)
{
	int length = x[0] & 0x1f;
	int i;

	if (length >= 3) {
		uint16_t sad = ((x[2] << 8) | x[1]);

		DEBUGF("    Speaker map:");

		for (i = 0; i < ARRAY_SIZE(sadb_map); i++) {
			if ((sad >> i) & 1)
				DEBUGF(" %s", sadb_map[i]);
		}

		DEBUGF("\n");
	}
}

static void
cea_vcdb(unsigned char *x)
{
	unsigned char d = x[2];

	decode(vcdb_fields, d, "    ");
}

static const char *colorimetry_map[] = {
	"xvYCC601",
	"xvYCC709",
	"sYCC601",
	"AdobeYCC601",
	"AdobeRGB",
	"BT2020cYCC",
	"BT2020YCC",
	"BT2020RGB",
};

static void
cea_colorimetry_block(unsigned char *x)
{
	int length = x[0] & 0x1f;
	int i;

	if (length >= 3) {
		for (i = 0; i < ARRAY_SIZE(colorimetry_map); i++) {
			if (x[2] >> i)
				printf("    %s\n", colorimetry_map[i]);
		}
	}
}

static const char *eotf_map[] = {
	"Traditional gamma - SDR luminance range",
	"Traditional gamma - HDR luminance range",
	"SMPTE ST2084",
};

static void
cea_hdr_metadata_block(unsigned char *x)
{
	int length = x[0] & 0x1f;
	int i;

	if (length >= 3) {
		printf("    Electro optical transfer functions:\n");
		for (i = 0; i < 6; i++) {
			if (x[2] >> i) {
				printf("      %s\n", i < ARRAY_SIZE(eotf_map) ?
						eotf_map[i] : "Unknown");
			}
		}
		printf("    Supported static metadata descriptors:\n");
		for (i = 0; i < 8; i++) {
			if (x[3] >> i)
				printf("      Static metadata type %d\n", i + 1);
		}
	}

	if (length >= 4)
		printf("    Desired content max luminance: %d\n", x[4]);

	if (length >= 5)
		printf("    Desired content max frame-average luminance: %d\n", x[5]);

	if (length >= 6)
		printf("    Desired content min luminance: %d\n", x[6]);
}

static void
cea_block(unsigned char *x)
{
	unsigned int oui;

	switch ((x[0] & 0xe0) >> 5) {
	case 0x01:
		DEBUGF("  Audio data block\n");
		cea_audio_block(x);
		break;
	case 0x02:
		DEBUGF("  Video data block\n");
		cea_video_block(x);
		break;
	case 0x03:
		/* yes really, endianness lols */
		oui = (x[3] << 16) + (x[2] << 8) + x[1];
		printf("  Vendor-specific data block, OUI %06x", oui);
		if (IEEEOUI != 0x000c03)
			IEEEOUI = oui;
		if (oui == 0x000c03)
			cea_hdmi_block(x);
		else
			printf("\n");
		break;
	case 0x04:
		DEBUGF("  Speaker allocation data block\n");
		cea_sadb(x);
		break;
	case 0x05:
		DEBUGF("  VESA DTC data block\n");
		break;
	case 0x07:
		DEBUGF("  Extended tag: ");
		extended_tag = x[1];
		switch (x[1]) {
		case 0x00:
			DEBUGF("video capability data block\n");
			cea_vcdb(x);
			break;
		case 0x01:
			DEBUGF("vendor-specific video data block\n");
			break;
		case 0x02:
			DEBUGF("VESA video display device information data block\n");
			break;
		case 0x03:
			DEBUGF("VESA video data block\n");
			break;
		case 0x04:
			DEBUGF("HDMI video data block\n");
			break;
		case 0x05:
			DEBUGF("Colorimetry data block\n");
			cea_colorimetry_block(x);
			break;
		case 0x06:
			DEBUGF("HDR static metadata data block\n");
			cea_hdr_metadata_block(x);
			break;
		case 0x0d:
			DEBUGF("Video format preference data block\n");
			cea_vfpdb(x);
			break;
		case 0x0e:
			DEBUGF("YCbCr 4:2:0 video data block\n");
			cea_y420vdb(x);
			break;
		case 0x0f:
			DEBUGF("YCbCr 4:2:0 capability map data block\n");
			break;
		case 0x10:
			DEBUGF("CEA miscellaneous audio fields\n");
			break;
		case 0x11:
			DEBUGF("Vendor-specific audio data block\n");
			break;
		case 0x12:
			DEBUGF("HDMI audio data block\n");
			break;
		case 0x20:
			DEBUGF("InfoFrame data block\n");
			break;
		default:
			if (x[1] >= 6 && x[1] <= 12)
				printf("Reserved video block (%02x)\n", x[1]);
			else if (x[1] >= 19 && x[1] <= 31)
				printf("Reserved audio block (%02x)\n", x[1]);
			else
				printf("Unknown (%02x)\n", x[1]);
			break;
		}
		break;
	default:
	{
		int tag = (*x & 0xe0) >> 5;
		int length = *x & 0x1f;
		printf("  Unknown tag %d, length %d (raw %02x)\n", tag, length, *x);
		break;
	}
	}
}

static int
parse_cea(unsigned char *x)
{
	int ret = 0;
	int version = x[1];
	int offset = x[2];
	unsigned char *detailed;

	if (version >= 1) do {
		if (version == 1 && x[3] != 0)
			ret = 1;

		if (offset < 4)
			break;

		if (version < 3) {
			printf("%d 8-byte timing descriptors\n", (offset - 4) / 8);
			if (offset - 4 > 0)
				/* do stuff */ ;
		} else if (version == 3) {
			int i;
			printf("%d bytes of CEA data\n", offset - 4);
			for (i = 4; i < offset; i += (x[i] & 0x1f) + 1) {
				cea_block(x + i);
			}
		}

		if (version >= 2) {
			if (x[3] & 0x80)
				DEBUGF("Underscans PC formats by default\n");
			if (x[3] & 0x40)
				DEBUGF("Basic audio support\n");
			if (x[3] & 0x20)
				DEBUGF("Supports YCbCr 4:4:4\n");
			if (x[3] & 0x10)
				DEBUGF("Supports YCbCr 4:2:2\n");
			DEBUGF("%d native detailed modes\n", x[3] & 0x0f);
		}

		for (detailed = x + offset; detailed + 18 < x + 127; detailed += 18)
			if (detailed[0]) {
				detailed_block(detailed, 1);
			}
	} while (0);

	do_checksum(x);

	return ret;
}

static int
parse_displayid_detailed_timing(unsigned char *x)
{
	int ha, hbl, hso, hspw;
	int va, vbl, vso, vspw;
	char phsync, pvsync, *stereo;
	int pix_clock;
	char *aspect;

	switch (x[3] & 0xf) {
	case 0:
		aspect = "1:1";
		break;
	case 1:
		aspect = "5:4";
		break;
	case 2:
		aspect = "4:3";
		break;
	case 3:
		aspect = "15:9";
		break;
	case 4:
		aspect = "16:9";
		break;
	case 5:
		aspect = "16:10";
		break;
	case 6:
		aspect = "64:27";
		break;
	case 7:
		aspect = "256:135";
		break;
	default:
		aspect = "undefined";
		break;
	}

	switch ((x[3] >> 5) & 0x3) {
	case 0:
		stereo = "";
		break;
	case 1:
		stereo = "stereo";
		break;
	case 2:
		stereo = "user action";
		break;
	case 3:
		stereo = "reserved";
		break;
	}

	printf("Type 1 detailed timing: aspect: %s, %s %s\n",
		aspect, x[3] & 0x80 ? "Preferred " : "", stereo);
	pix_clock = x[0] + (x[1] << 8) + (x[2] << 16);
	ha = x[4] | (x[5] << 8);
	hbl = x[6] | (x[7] << 8);
	hso = x[8] | ((x[9] & 0x7f) << 8);
	phsync = ((x[9] >> 7) & 0x1) ? '+' : '-';
	hspw = x[10] | (x[11] << 8);
	va = x[12] | (x[13] << 8);
	vbl = x[14] | (x[15] << 8);
	vso = x[16] | ((x[17] & 0x7f) << 8);
	vspw = x[18] | (x[19] << 8);
	pvsync = ((x[17] >> 7) & 0x1 ) ? '+' : '-';

	printf("Detailed mode (2) : Clock %f MHz, %d mm x %d mm\n"
			"               %4d %4d %4d %4d\n"
			"               %4d %4d %4d %4d\n"
			"               %chsync %cvsync\n",
			(double)pix_clock/100.0, 0, 0,
			ha, ha + hso, ha + hso + hspw, ha + hbl,
			va, va + vso, va + vso + vspw, va + vbl,
			phsync, pvsync
	      );
	return 1;
}

static int
parse_displayid(unsigned char *x)
{
	int version = x[1];
	int length = x[2];
	int ext_count = x[4];
	int i;
	printf("Length %d, version %d, extension count %d\n", length, version, ext_count);
	int offset = 5;
	while (length > 0) {
		int tag = x[offset];
		int len = x[offset + 2];

		if (len == 0)
			break;
		switch (tag) {
		case 0:
			printf("Product ID block\n");
			break;
		case 1:
			printf("Display Parameters block\n");
			break;
		case 2:
			printf("Color characteristics block\n");
			break;
		case 3: {
				for (i = 0; i < len / 20; i++) {
					parse_displayid_detailed_timing(&x[offset + 3 + (i * 20)]);
				}
				break;
			}
		case 4:
			printf("Type 2 detailed timing\n");
			break;
		case 5:
			printf("Type 3 short timing\n");
			break;
		case 6:
			printf("Type 4 DMT timing\n");
			break;
		case 7:
			printf("VESA DMT timing block\n");
			break;
		case 8:
			printf("CEA timing block\n");
			break;
		case 9:
			printf("Video timing range\n");
			break;
		case 0xa:
			printf("Product serial number\n");
			break;
		case 0xb:
			printf("GP ASCII string\n");
			break;
		case 0xc:
			printf("Display device data\n");
			break;
		case 0xd:
			printf("Interface power sequencing\n");
			break;
		case 0xe:
			printf("Transfer characterisitics\n");
			break;
		case 0xf:
			printf("Display interface\n");
			break;
		case 0x10:
			printf("Stereo display interface\n");
			break;
		case 0x12: {
			   int capabilities = x[offset + 3];
			   int num_v_tile = (x[offset + 4] & 0xf) | (x[offset + 6] & 0x30);
			   int num_h_tile = (x[offset + 4] >> 4) | ((x[offset + 6] >> 2) & 0x30);
			   int tile_v_location = (x[offset + 5] & 0xf) | ((x[offset + 6] & 0x3) << 4);
			   int tile_h_location = (x[offset + 5] >> 4) | (((x[offset + 6] >> 2) & 0x3) << 4);
			   int tile_width = x[offset + 7] | (x[offset + 8] << 8);
			   int tile_height = x[offset + 9] | (x[offset + 10] << 8);
			   printf("tiled display block: capabilities 0x%08x\n", capabilities);
			   printf("num horizontal tiles %d, num vertical tiles %d\n", num_h_tile + 1, num_v_tile + 1);
			   printf("tile location (%d, %d)\n", tile_h_location, tile_v_location);
			   printf("tile dimensions (%d, %d)\n", tile_width + 1, tile_height + 1);
			   break;
			}
		default:
			printf("Unknown displayid data block 0x%x\n", tag);
			break;
		}
		length -= len + 3;
		offset += len + 3;
	}
	return 1;
}
/* generic extension code */

static void
extension_version(unsigned char *x)
{
	printf("Extension version: %d\n", x[1]);
}

static int
parse_extension(unsigned char *x)
{
	int conformant_extension = 0;
	printf("\n");

	switch(x[0]) {
	case 0x02:
		printf("CEA extension block\n");
		extension_version(x);
		conformant_extension = parse_cea(x);
		break;
	case 0x10: printf("VTB extension block\n"); break;
	case 0x40: printf("DI extension block\n"); break;
	case 0x50: printf("LS extension block\n"); break;
	case 0x60: printf("DPVL extension block\n"); break;
	case 0x70: printf("DisplayID extension block\n");
		   extension_version(x);
		   parse_displayid(x);
		   break;
	case 0xF0: printf("Block map\n"); break;
	case 0xFF: printf("Manufacturer-specific extension block\n");
	default:
		printf("Unknown extension block\n");
		break;
	}

	printf("\n");

	return conformant_extension;
}

static int edid_lines = 0;

/* E-EDID Standard, Table 3.18 */
static const struct {
	int x, y, refresh;
} established_table[] = {
	/* 0x23 bit 7 - 0 */
	{720, 400, 70},
	{720, 400, 88},
	{640, 480, 60},
	{640, 480, 67},
	{640, 480, 72},
	{640, 480, 75},
	{800, 600, 56},
	{800, 600, 60},
	/* 0x24 bit 7 - 0 */
	{800, 600, 72},
	{800, 600, 75},
	{832, 624, 75},
	{1280, 768, 87},
	{1024, 768, 60},
	{1024, 768, 70},
	{1024, 768, 75},
	{1280, 1024, 75},
	/* 0x25 bit 7*/
	{1152, 870, 75},
};

#ifdef DEBUG_EDID
static void print_subsection(char *name, unsigned char *edid, int start,
		int end)
{
	int i;

	printf("%s:", name);
	for (i = strlen(name); i < 15; i++)
		printf(" ");
	for (i = start; i <= end; i++)
		printf(" %02x", edid[i]);
	printf("\n");
}

void dump_breakdown(unsigned char *edid)
{
	printf("Extracted contents:\n");
	print_subsection("header", edid, 0, 7);
	print_subsection("serial number", edid, 8, 17);
	print_subsection("version", edid,18, 19);
	print_subsection("basic params", edid, 20, 24);
	print_subsection("chroma info", edid, 25, 34);
	print_subsection("established", edid, 35, 37);
	print_subsection("standard", edid, 38, 53);
	print_subsection("descriptor 1", edid, 54, 71);
	print_subsection("descriptor 2", edid, 72, 89);
	print_subsection("descriptor 3", edid, 90, 107);
	print_subsection("descriptor 4", edid, 108, 125);
	print_subsection("extensions", edid, 126, 126);
	print_subsection("checksum", edid, 127, 127);
	printf("\n");
}
#endif

void parse_edid(unsigned char *edid, unsigned int blk_len)
{
	unsigned char *x;
	int analog, i;
	int ret;
	char str[128];

	/* Initialization */
	IEEEOUI = 0x0; /* default DVI */
	extended_tag = 0x0;
	detailed_cnt = 0;
	standard_cnt = 0;
	established_cnt = 0;

	memset(established_timings, 0, sizeof(established_timings));
	memset(standard_timings, 0, sizeof(standard_timings));
	memset(detailed_timings, 0, sizeof(detailed_timings));

#ifdef DEBUG_EDID
	dump_breakdown(edid);
#endif

	/* check edid.bin file */
	ret = file_exists("mmc", "0", "edid.bin", FS_TYPE_ANY);
	if(!ret) {
		printf("[edid-decode] edid.bin doesn't exist, now build edid.bin\n");

		sprintf(str, "fatwrite mmc 0 0x%lx  edid.bin 0x%x",
			(unsigned long)edid, (128 * blk_len));
		run_command(str, 0);
	}



	if (!edid || memcmp(edid, "\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00", 8)) {
		printf("No header found\n");
		/* return 1; */
	}

	/* set edid_lines */
	edid_lines = ((128 * blk_len) / 16);

	printf("Manufacturer: %s Model %x Serial Number %u\n",
			manufacturer_name(edid + 0x08),
			(unsigned short)(edid[0x0A] + (edid[0x0B] << 8)),
			(unsigned int)(edid[0x0C] + (edid[0x0D] << 8)
				+ (edid[0x0E] << 16) + (edid[0x0F] << 24)));

	printf("EDID version: %hd.%hd\n", edid[0x12], edid[0x13]);
	if (edid[0x12] == 1) {
		if (edid[0x13] > 4) {
			printf("Claims > 1.4, assuming 1.4 conformance\n");
			edid[0x13] = 4;
		}
		switch (edid[0x13]) {
			case 4:
				claims_one_point_four = 1;
			case 3:
				claims_one_point_three = 1;
			case 2:
				claims_one_point_two = 1;
			default:
				break;
		}
		claims_one_point_oh = 1;
	}

	/* display section */
	if (edid[0x14] & 0x80) {
		int conformance_mask;
		analog = 0;
		DEBUGF("Digital display\n");
		if (claims_one_point_four || claims_one_point_three) {
			conformance_mask = 0;
			if ((edid[0x14] & 0x70) == 0x00)
				DEBUGF("Color depth is undefined\n");
			else if ((edid[0x14] & 0x70) == 0x70)
				nonconformant_digital_display = 1;
			else
				DEBUGF("%d bits per primary color channel\n",
						((edid[0x14] & 0x70) >> 3) + 4);

			switch (edid[0x14] & 0x0f) {
				case 0x00: DEBUGF("Digital interface is not defined\n"); break;
				case 0x01: DEBUGF("DVI interface\n"); break;
				case 0x02: DEBUGF("HDMI-a interface\n"); break;
				case 0x03: DEBUGF("HDMI-b interface\n"); break;
				case 0x04: DEBUGF("MDDI interface\n"); break;
				case 0x05: DEBUGF("DisplayPort interface\n"); break;
				default:
					   nonconformant_digital_display = 1;
			}
		} else if (claims_one_point_two) {
			conformance_mask = 0x7E;
			if (edid[0x14] & 0x01) {
				printf("DFP 1.x compatible TMDS\n");
			}
		} else conformance_mask = 0x7F;
		if (!nonconformant_digital_display)
			nonconformant_digital_display = edid[0x14] & conformance_mask;
	} else {
		analog = 1;
		int voltage = (edid[0x14] & 0x60) >> 5;
		int sync = (edid[0x14] & 0x0F);
		printf("Analog display, Input voltage level: %s V\n",
				voltage == 3 ? "0.7/0.7" :
				voltage == 2 ? "1.0/0.4" :
				voltage == 1 ? "0.714/0.286" :
				"0.7/0.3");

		if (claims_one_point_four) {
			if (edid[0x14] & 0x10)
				printf("Blank-to-black setup/pedestal\n");
			else
				printf("Blank level equals black level\n");
		} else if (edid[0x14] & 0x10) {
			/*
			 * XXX this is just the X text.  1.3 says "if set, display expects
			 * a blank-to-black setup or pedestal per appropriate Signal
			 * Level Standard".  Whatever _that_ means.
			 */
			printf("Configurable signal levels\n");
		}

		printf("Sync: %s%s%s%s\n", sync & 0x08 ? "Separate " : "",
				sync & 0x04 ? "Composite " : "",
				sync & 0x02 ? "SyncOnGreen " : "",
				sync & 0x01 ? "Serration " : "");
	}

	if (edid[0x15] && edid[0x16])
		DEBUGF("Maximum image size: %d cm x %d cm\n", edid[0x15], edid[0x16]);
	else if (claims_one_point_four && (edid[0x15] || edid[0x16])) {
		if (edid[0x15])
			DEBUGF("Aspect ratio is %f (landscape)\n", 100.0/(edid[0x16] + 99));
		else
			DEBUGF("Aspect ratio is %f (portrait)\n", 100.0/(edid[0x15] + 99));
	} else {
		/* Either or both can be zero for 1.3 and before */
		DEBUGF("Image size is variable\n");
	}

	if (edid[0x17] == 0xff) {
		if (claims_one_point_four)
			DEBUGF("Gamma is defined in an extension block\n");
		else
			/* XXX Technically 1.3 doesn't say this... */
			DEBUGF("Gamma: 1.0\n");
	} else DEBUGF("Gamma: %.2f\n", ((edid[0x17] + 100.0) / 100.0));

	if (edid[0x18] & 0xE0) {
		DEBUGF("DPMS levels:");
		if (edid[0x18] & 0x80) DEBUGF(" Standby");
		if (edid[0x18] & 0x40) DEBUGF(" Suspend");
		if (edid[0x18] & 0x20) DEBUGF(" Off");
		DEBUGF("\n");
	}

	/* FIXME: this is from 1.4 spec, check earlier */
	if (analog) {
		switch (edid[0x18] & 0x18) {
			case 0x00: DEBUGF("Monochrome or grayscale display\n"); break;
			case 0x08: DEBUGF("RGB color display\n"); break;
			case 0x10: DEBUGF("Non-RGB color display\n"); break;
			case 0x18: DEBUGF("Undefined display color type\n");
		}
	} else {
		DEBUGF("Supported color formats: RGB 4:4:4");
		if (edid[0x18] & 0x08)
			DEBUGF(", YCrCb 4:4:4");
		if (edid[0x18] & 0x10)
			DEBUGF(", YCrCb 4:2:2");
		DEBUGF("\n");
	}

	if (edid[0x18] & 0x04)
		DEBUGF("Default (sRGB) color space is primary color space\n");
	if (edid[0x18] & 0x02) {
		DEBUGF("First detailed timing is preferred timing\n");
		has_preferred_timing = 1;
	}
	if (edid[0x18] & 0x01)
		DEBUGF("Supports GTF timings within operating range\n");

	/* XXX color section */

	printf("Established timings supported:\n");
	for (i = 0; i < 17; i++) {
		if (edid[0x23 + i / 8] & (1 << (7 - i % 8))) {
			printf("  %dx%d@%dHz\n", established_table[i].x,
					established_table[i].y, established_table[i].refresh);

			/* store available established timings */
			established_timings[established_cnt].width = established_table[i].x;
			established_timings[established_cnt].height = established_table[i].y;
			established_timings[established_cnt].refresh = established_table[i].refresh;
			if (i == 11) /* 1024x768 @ 87Hz(I), IBM-Interlaced */
				established_timings[established_cnt].scanmode = 0; /* interlaced */
			else
				established_timings[established_cnt].scanmode = 1; /* progress */
			/* increase count */
			established_cnt++;
		}
	}

	printf("Standard timings supported:\n");
	for (i = 0; i < 8; i++) {
		/* Byte 38, X resolution */
		uint8_t b1 = edid[0x26 + i * 2], b2 = edid[0x26 + i * 2 + 1];
		unsigned int x, y, refresh;

		if (b1 == 0x01 && b2 == 0x01)
			continue;

		if (b1 == 0) {
			printf("non-conformant standard timing (0 horiz)\n");
			continue;
		}
		x = (b1 + 31) * 8;
		switch ((b2 >> 6) & 0x3) {
		case 0x00:
			if (claims_one_point_three)
				y = x * 10 / 16;
			else
				y = x;
			break;
		case 0x01:
			y = x * 3 / 4;
			break;
		case 0x02:
			y = x * 4 / 5;
			break;
		case 0x03:
		default: /*FIXME */
			y = x * 9 / 16;
			break;
		}
		refresh = 60 + (b2 & 0x3f);

		/* store available standard timings */
		standard_timings[standard_cnt].width = x;
		standard_timings[standard_cnt].height = y;
		standard_timings[standard_cnt].refresh = refresh;
		standard_timings[standard_cnt].scanmode = 1; /* progress */
		/* increase count */
		standard_cnt++;

		printf("  %dx%d@%dHz\n", x, y, refresh);
	}

	/* detailed timings */
	has_valid_detailed_blocks = detailed_block(edid + 0x36, 0);
	if (has_preferred_timing && !did_detailed_timing)
		has_preferred_timing = 0; /* not really accurate... */
	has_valid_detailed_blocks &= detailed_block(edid + 0x48, 0);
	has_valid_detailed_blocks &= detailed_block(edid + 0x5A, 0);
	has_valid_detailed_blocks &= detailed_block(edid + 0x6C, 0);

	/* check this, 1.4 verification guide says otherwise */
	if (edid[0x7e]) {
		printf("Has %d extension blocks\n", edid[0x7e]);
		/* 2 is impossible because of the block map */
		if (edid[0x7e] != 2)
			has_valid_extension_count = 1;
	} else {
		has_valid_extension_count = 1;
	}

	do_checksum(edid);

	x = edid;

	for (edid_lines /= 8; edid_lines > 1; edid_lines--) {
		x += 128;
		nonconformant_extension += parse_extension(x);
	}

	if (claims_one_point_three) {
		if (nonconformant_digital_display ||
				!has_valid_string_termination ||
				!has_valid_descriptor_pad ||
				!has_name_descriptor ||
				!name_descriptor_terminated ||
				!has_preferred_timing ||
				!has_range_descriptor)
			conformant = 0;
		if (!conformant)
			printf("EDID block does NOT conform to EDID 1.3!\n");
		if (nonconformant_digital_display)
			printf("\tDigital display field contains garbage: %x\n",
					nonconformant_digital_display);
		if (!has_name_descriptor)
			printf("\tMissing name descriptor\n");
		else if (!name_descriptor_terminated)
			printf("\tName descriptor not terminated with a newline\n");
		if (!has_preferred_timing)
			printf("\tMissing preferred timing\n");
		if (!has_range_descriptor)
			printf("\tMissing monitor ranges\n");
		if (!has_valid_descriptor_pad) /* Might be more than just 1.3 */
			printf("\tInvalid descriptor block padding\n");
		if (!has_valid_string_termination) /* Likewise */
			printf("\tDetailed block string not properly terminated\n");
	} else if (claims_one_point_two) {
		if (nonconformant_digital_display ||
				(has_name_descriptor && !name_descriptor_terminated))
			conformant = 0;
		if (!conformant)
			printf("EDID block does NOT conform to EDID 1.2!\n");
		if (nonconformant_digital_display)
			printf("\tDigital display field contains garbage: %x\n",
					nonconformant_digital_display);
		if (has_name_descriptor && !name_descriptor_terminated)
			printf("\tName descriptor not terminated with a newline\n");
	} else if (claims_one_point_oh) {
		if (seen_non_detailed_descriptor)
			conformant = 0;
		if (!conformant)
			printf("EDID block does NOT conform to EDID 1.0!\n");
		if (seen_non_detailed_descriptor)
			printf("\tHas descriptor blocks other than detailed timings\n");
	}

	if (nonconformant_extension ||
			!has_valid_checksum ||
			!has_valid_cvt ||
			!has_valid_year ||
			!has_valid_week ||
			!has_valid_detailed_blocks ||
			!has_valid_dummy_block ||
			!has_valid_extension_count ||
			!has_valid_descriptor_ordering ||
			!has_valid_range_descriptor ||
			!manufacturer_name_well_formed) {
		conformant = 0;
#ifdef DEBUG_EDID
		printf("EDID block does not conform at all!\n");
		if (nonconformant_extension)
			printf("\tHas %d nonconformant extension block(s)\n",
					nonconformant_extension);
		if (!has_valid_checksum)
			printf("\tBlock has broken checksum\n");
		if (!has_valid_cvt)
			printf("\tBroken 3-byte CVT blocks\n");
		if (!has_valid_year)
			printf("\tBad year of manufacture\n");
		if (!has_valid_week)
			printf("\tBad week of manufacture\n");
		if (!has_valid_detailed_blocks)
			printf("\tDetailed blocks filled with garbage\n");
		if (!has_valid_dummy_block)
			printf("\tDummy block filled with garbage\n");
		if (!has_valid_extension_count)
			printf("\tImpossible extension block count\n");
		if (!manufacturer_name_well_formed)
			printf("\tManufacturer name field contains garbage\n");
		if (!has_valid_descriptor_ordering)
			printf("\tInvalid detailed timing descriptor ordering\n");
		if (!has_valid_range_descriptor)
			printf("\tRange descriptor contains garbage\n");
		if (!has_valid_max_dotclock)
			printf("\tEDID 1.4 block does not set max dotclock\n");
#endif
	}
#ifdef DEBUG_EDID
	if (warning_excessive_dotclock_correction)
		printf("Warning: CVT block corrects dotclock by more than 9.75MHz\n");
	if (warning_zero_preferred_refresh)
		printf("Warning: CVT block does not set preferred refresh rate\n");
#endif
}

#ifdef DEBUG_EDID
void print_available_timings(void)
{
	int i;

	printf("[Detailed Timings]\n");
	for (i = 0; i < detailed_cnt; i++) {
		printf("    [%d] width %d, height %d, pclk %d\n",
			i, detailed_timings[i].width, detailed_timings[i].height,
			detailed_timings[i].pclk);
		printf("    hdisp %d, hsyncstart %d, hsyncend %d, htotal %d\n",
			detailed_timings[i].hdisp, detailed_timings[i].hsyncstart,
			detailed_timings[i].hsyncend, detailed_timings[i].htotal);
		printf("    vdisp %d, vsyncstart %d, vsyncend %d, vtotal %d\n",
			detailed_timings[i].vdisp, detailed_timings[i].vsyncstart,
			detailed_timings[i].vsyncend, detailed_timings[i].vtotal);
		printf("    hsync_flag %d, vsync_flag %d, scanmode %d\n",
			detailed_timings[i].hsync_flag, detailed_timings[i].vsync_flag,
			detailed_timings[i].scanmode);
	}

	printf("[Standard Timings]\n");
	for (i = 0; i < standard_cnt; i++)
		printf("    [%d] width %d, height %d, refresh %d, scanmode %d\n",
			i, standard_timings[i].width, standard_timings[i].height,
			standard_timings[i].refresh, standard_timings[i].scanmode);

	printf("[Established Timings]\n");
	for (i = 0; i < established_cnt; i++)
		printf("    [%d] width %d, height %d, refresh %d, scanmode %d\n",
			i, established_timings[i].width, established_timings[i].height,
			established_timings[i].refresh, established_timings[i].scanmode);

}
#endif /* DEBUG_EDID */

char *select_best_resolution(void)
{
	int i, j;
	int width, height, refresh, scanmode;
	double pclk, hfreq, vfreq;
	int ret;
	char temp[10];
	char modeline[100];
	char str[128];
	bool config = false;

#ifdef DEBUG_EDID
	print_available_timings();
#endif

	/* 1. select the biggest one among detailed timings */
	if (detailed_cnt) {
		j = 0;
		for (i = 1; i < detailed_cnt; i++) {
			if (detailed_timings[i].width > detailed_timings[j].width)
				j = i;
		}

		/* width 1366 is not available */
		if (detailed_timings[j].width == 1366) {
			detailed_timings[j].width = 1360;
			detailed_timings[j].hdisp = 1360;
		}

		/* check if 4k resolution */
		if (detailed_timings[j].width == 3840) {
			width = detailed_timings[j].width;
			height = detailed_timings[j].height;

			pclk = detailed_timings[j].pclk * 1000;
			vfreq = (double)((pclk / detailed_timings[j].htotal) / detailed_timings[j].vtotal) + 0.5;
			refresh = (int)vfreq;
			scanmode = detailed_timings[j].scanmode;

			config = true;
		} else {
			pclk = detailed_timings[j].pclk * 1000;
			hfreq = (pclk / detailed_timings[j].htotal);
			vfreq = (double)((pclk / detailed_timings[j].htotal) / detailed_timings[j].vtotal) + 0.5;
			/* build up modeline information */
			sprintf(modeline, "%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
					detailed_timings[j].width, detailed_timings[j].height,
					detailed_timings[j].pclk,
					(int)hfreq, (int)vfreq,
					detailed_timings[j].hdisp, detailed_timings[j].hsyncstart,
					detailed_timings[j].hsyncend, detailed_timings[j].htotal,
					detailed_timings[j].vdisp, detailed_timings[j].vsyncstart,
					detailed_timings[j].vsyncend, detailed_timings[j].vtotal,
					detailed_timings[j].hsync_flag, detailed_timings[j].vsync_flag,
					detailed_timings[j].scanmode);

			sprintf(bestmode, "custombuilt");
			setenv("modeline", modeline);

			/* set up display parameters for android */
			memset(temp, 0, sizeof(temp));
			sprintf(temp, "%d", detailed_timings[j].width);
			setenv("customwidth", temp);

			memset(temp, 0, sizeof(temp));
			sprintf(temp, "%d", detailed_timings[j].height);
			setenv("customheight", temp);

			config = true;

			goto DONE;
		}

	/* 2. select the biggest width among standard timings */
	} else if (standard_cnt) {
		j = 0;
		for (i = 1; i < standard_cnt; i++) {
			if (standard_timings[i].width > standard_timings[j].width) {
				j = i;
			}
		}
		width = standard_timings[j].width;
		height = standard_timings[j].height;
		refresh = standard_timings[j].refresh;
		scanmode = standard_timings[j].scanmode;

		config = true;
	/* 3. select the biggest width among established timings */
	} else if (established_cnt) {
		j = 0;
		for (i = 1; i < established_cnt; i++) {
			if (established_timings[i].width > established_timings[j].width) {
				j = i;
			}
		}
		width = established_timings[j].width;
		height = established_timings[j].height;
		refresh = established_timings[j].refresh;
		scanmode = established_timings[j].scanmode;

		config = true;
	/* 4. there is no available timings from EDID, so set default 1080p60hz, DVI */
	} else {
		sprintf(bestmode, "1080p60hz");
		config = false;
		goto DONE;
	}

	/* make hdmimode string */
	memset(temp, 0, sizeof(temp));

	/* width 1366 is not available */
	if (width == 1366)
		width = 1360;

	if ((width == 1920 && height == 1080) || (width == 720) || (width == 3840))
		sprintf(temp, "%d", height);
	else
		sprintf(temp, "%dx%d", width, height);

	if (scanmode)
		strcat(temp, "p");
	else
		strcat(temp, "i");

	/* YCbCr 4:2:0 */
	if ((extended_tag == 0xf) && (width == 3840))
		sprintf(bestmode, "%s%dhz420", temp, refresh);
	else
		sprintf(bestmode, "%s%dhz", temp, refresh);

	/* search on c2_support_modes */
	for (i = 0; i < ARRAY_SIZE(c2_support_modes); i++) {
		if (!strcmp(c2_support_modes[i], bestmode)) {
			printf("c2_support_mode %s\n", c2_support_modes[i]);
			goto DONE;
		}
	}

	/* there is no available mode that is matched with one of c2 supported modes
	 * so now, set default mode
	 */
	sprintf(bestmode, "1080p60hz");
	config = false;

DONE:
	printf("bestmode is %s, IEEEOUI 0x%06x\n", bestmode, IEEEOUI);

	/* set vout mode */
	if (IEEEOUI == 0x000c03) {
		printf("HDMI Mode\n");

		setenv("vout", "hdmi");
		setenv("vout_mode", "hdmi");
	} else {
		printf("DVI Mode\n");

		setenv("vout", "dvi");
		setenv("vout_mode", "dvi");
	}

	/* drop a bin file including auto detection information */
	ret = file_exists("mmc", "0", "display.bin", FS_TYPE_ANY);
	if(!ret) {
		printf("NOT EXIST, now build display.bin\n");

		if (config == true) {
			sprintf(result, "Auto Detect OK:%s,%s(%s)", bestmode, getenv("vout"), modeline);
			sprintf(str, "fatwrite mmc 0 0x%lx  display.bin  0x78",
				(unsigned long)result);
			run_command(str, 0);
		} else {
			sprintf(result, "Auto Detect FAIL:%s,%s", bestmode, getenv("vout"));
			sprintf(str, "fatwrite mmc 0 0x%lx  display.bin  0x78",
				(unsigned long)result);
			run_command(str, 0);
		}
	}

	return bestmode;
}