[people/ms/u-boot.git] / common / edid.c

/*
 * Copyright (c) 2012 The Chromium OS Authors.
 *
 * (C) Copyright 2010
 * Petr Stetiar <ynezz@true.cz>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 *
 * Contains stolen code from ddcprobe project which is:
 * Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
 */

#include <common.h>
#include <edid.h>
#include <errno.h>
#include <fdtdec.h>
#include <linux/ctype.h>
#include <linux/string.h>

int edid_check_info(struct edid1_info *edid_info)
{
	if ((edid_info == NULL) || (edid_info->version == 0))
		return -1;

	if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
		return -1;

	if (edid_info->version == 0xff && edid_info->revision == 0xff)
		return -1;

	return 0;
}

int edid_check_checksum(u8 *edid_block)
{
	u8 checksum = 0;
	int i;

	for (i = 0; i < 128; i++)
		checksum += edid_block[i];

	return (checksum == 0) ? 0 : -EINVAL;
}

int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
		    unsigned int *hmax, unsigned int *vmin,
		    unsigned int *vmax)
{
	int i;
	struct edid_monitor_descriptor *monitor;

	*hmin = *hmax = *vmin = *vmax = 0;
	if (edid_check_info(edid))
		return -1;

	for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
		monitor = &edid->monitor_details.descriptor[i];
		if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
			*hmin = monitor->data.range_data.horizontal_min;
			*hmax = monitor->data.range_data.horizontal_max;
			*vmin = monitor->data.range_data.vertical_min;
			*vmax = monitor->data.range_data.vertical_max;
			return 0;
		}
	}
	return -1;
}

/* Set all parts of a timing entry to the same value */
static void set_entry(struct timing_entry *entry, u32 value)
{
	entry->min = value;
	entry->typ = value;
	entry->max = value;
}

/**
 * decode_timing() - Decoding an 18-byte detailed timing record
 *
 * @buf:	Pointer to EDID detailed timing record
 * @timing:	Place to put timing
 */
static void decode_timing(u8 *buf, struct display_timing *timing)
{
	uint x_mm, y_mm;
	unsigned int ha, hbl, hso, hspw, hborder;
	unsigned int va, vbl, vso, vspw, vborder;

	/* Edid contains pixel clock in terms of 10KHz */
	set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000);
	x_mm = (buf[12] + ((buf[14] & 0xf0) << 4));
	y_mm = (buf[13] + ((buf[14] & 0x0f) << 8));
	ha = (buf[2] + ((buf[4] & 0xf0) << 4));
	hbl = (buf[3] + ((buf[4] & 0x0f) << 8));
	hso = (buf[8] + ((buf[11] & 0xc0) << 2));
	hspw = (buf[9] + ((buf[11] & 0x30) << 4));
	hborder = buf[15];
	va = (buf[5] + ((buf[7] & 0xf0) << 4));
	vbl = (buf[6] + ((buf[7] & 0x0f) << 8));
	vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2));
	vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4));
	vborder = buf[16];

	set_entry(&timing->hactive, ha);
	set_entry(&timing->hfront_porch, hso);
	set_entry(&timing->hback_porch, hbl - hso - hspw);
	set_entry(&timing->hsync_len, hspw);

	set_entry(&timing->vactive, va);
	set_entry(&timing->vfront_porch, vso);
	set_entry(&timing->vback_porch, vbl - vso - vspw);
	set_entry(&timing->vsync_len, vspw);

	debug("Detailed mode clock %u Hz, %d mm x %d mm\n"
	      "               %04x %04x %04x %04x hborder %x\n"
	      "               %04x %04x %04x %04x vborder %x\n",
	      timing->pixelclock.typ,
	      x_mm, y_mm,
	      ha, ha + hso, ha + hso + hspw,
	      ha + hbl, hborder,
	      va, va + vso, va + vso + vspw,
	      va + vbl, vborder);
}

int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
		    int *panel_bits_per_colourp)
{
	struct edid1_info *edid = (struct edid1_info *)buf;
	bool timing_done;
	int i;

	if (buf_size < sizeof(*edid) || edid_check_info(edid)) {
		debug("%s: Invalid buffer\n", __func__);
		return -EINVAL;
	}

	if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) {
		debug("%s: No preferred timing\n", __func__);
		return -ENOENT;
	}

	/* Look for detailed timing */
	timing_done = false;
	for (i = 0; i < 4; i++) {
		struct edid_monitor_descriptor *desc;

		desc = &edid->monitor_details.descriptor[i];
		if (desc->zero_flag_1 != 0) {
			decode_timing((u8 *)desc, timing);
			timing_done = true;
			break;
		}
	}
	if (!timing_done)
		return -EINVAL;

	if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) {
		debug("%s: Not a digital display\n", __func__);
		return -ENOSYS;
	}
	if (edid->version != 1 || edid->revision < 4) {
		debug("%s: EDID version %d.%d does not have required info\n",
		      __func__, edid->version, edid->revision);
		*panel_bits_per_colourp = -1;
	} else  {
		*panel_bits_per_colourp =
			((edid->video_input_definition & 0x70) >> 3) + 4;
	}

	return 0;
}

/**
 * Snip the tailing whitespace/return of a string.
 *
 * @param string	The string to be snipped
 * @return the snipped string
 */
static char *snip(char *string)
{
	char *s;

	/*
	 * This is always a 13 character buffer
	 * and it's not always terminated.
	 */
	string[12] = '\0';
	s = &string[strlen(string) - 1];

	while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
			*s == '\0'))
		*(s--) = '\0';

	return string;
}

/**
 * Print an EDID monitor descriptor block
 *
 * @param monitor	The EDID monitor descriptor block
 * @have_timing		Modifies to 1 if the desciptor contains timing info
 */
static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
			   unsigned int *have_timing)
{
	unsigned char *bytes = (unsigned char *)monitor;
	struct edid_detailed_timing *timing =
			(struct edid_detailed_timing *)monitor;

	if (bytes[0] == 0 && bytes[1] == 0) {
		if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
			printf("Monitor serial number: %s\n",
			       snip(monitor->data.string));
		else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
			printf("Monitor ID: %s\n",
			       snip(monitor->data.string));
		else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
			printf("Monitor name: %s\n",
			       snip(monitor->data.string));
		else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
			printf("Monitor range limits, horizontal sync: "
			       "%d-%d kHz, vertical refresh: "
			       "%d-%d Hz, max pixel clock: "
			       "%d MHz\n",
			       monitor->data.range_data.horizontal_min,
			       monitor->data.range_data.horizontal_max,
			       monitor->data.range_data.vertical_min,
			       monitor->data.range_data.vertical_max,
			       monitor->data.range_data.pixel_clock_max * 10);
	} else {
		uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
		uint32_t h_total, v_total, vfreq;

		pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
		h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
		h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
		v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
		v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);

		h_total = h_active + h_blanking;
		v_total = v_active + v_blanking;
		if (v_total * h_total)
			vfreq = pixclock / (v_total * h_total);
		else
			vfreq = 1; /* Error case */
		printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
		       v_active, h_active > 1000 ? ' ' : '\t', vfreq);
		*have_timing = 1;
	}
}

/**
 * Get the manufacturer name from an EDID info.
 *
 * @param edid_info     The EDID info to be printed
 * @param name		Returns the string of the manufacturer name
 */
static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
{
	name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
	name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
	name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
	name[3] = '\0';
}

void edid_print_info(struct edid1_info *edid_info)
{
	int i;
	char manufacturer[4];
	unsigned int have_timing = 0;
	uint32_t serial_number;

	if (edid_check_info(edid_info)) {
		printf("Not a valid EDID\n");
		return;
	}

	printf("EDID version: %d.%d\n",
	       edid_info->version, edid_info->revision);

	printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));

	edid_get_manufacturer_name(edid_info, manufacturer);
	printf("Manufacturer: %s\n", manufacturer);

	serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
	if (serial_number != 0xffffffff) {
		if (strcmp(manufacturer, "MAG") == 0)
			serial_number -= 0x7000000;
		if (strcmp(manufacturer, "OQI") == 0)
			serial_number -= 456150000;
		if (strcmp(manufacturer, "VSC") == 0)
			serial_number -= 640000000;
	}
	printf("Serial number: %08x\n", serial_number);
	printf("Manufactured in week: %d year: %d\n",
	       edid_info->week, edid_info->year + 1990);

	printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
	       EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
	       "digital signal, " : "analog signal, ",
	       EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
	       EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
	       ", blank to black" : "",
	       EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
	       ", separate sync" : "",
	       EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
	       ", composite sync" : "",
	       EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
	       ", sync on green" : "",
	       EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
	       ", serration v" : "");

	printf("Monitor is %s\n",
	       EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");

	printf("Maximum visible display size: %d cm x %d cm\n",
	       edid_info->max_size_horizontal,
	       edid_info->max_size_vertical);

	printf("Power management features: %s%s, %s%s, %s%s\n",
	       EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
	       "" : "no ", "active off",
	       EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
	       EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");

	printf("Estabilished timings:\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
		printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
		printf("\t720x400\t\t88 Hz (XGA2)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
		printf("\t640x480\t\t60 Hz (VGA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
		printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
		printf("\t640x480\t\t72 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
		printf("\t640x480\t\t75 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
		printf("\t800x600\t\t56 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
		printf("\t800x600\t\t60 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
		printf("\t800x600\t\t72 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
		printf("\t800x600\t\t75 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
		printf("\t832x624\t\t75 Hz (Mac II)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
		printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
		printf("\t1024x768\t60 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
		printf("\t1024x768\t70 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
		printf("\t1024x768\t75 Hz (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
		printf("\t1280x1024\t75 (VESA)\n");
	if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
		printf("\t1152x870\t75 (Mac II)\n");

	/* Standard timings. */
	printf("Standard timings:\n");
	for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
		unsigned int aspect = 10000;
		unsigned int x, y;
		unsigned char xres, vfreq;

		xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
		vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
		if ((xres != vfreq) ||
		    ((xres != 0) && (xres != 1)) ||
		    ((vfreq != 0) && (vfreq != 1))) {
			switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
					i)) {
			case ASPECT_625:
				aspect = 6250;
				break;
			case ASPECT_75:
				aspect = 7500;
				break;
			case ASPECT_8:
				aspect = 8000;
				break;
			case ASPECT_5625:
				aspect = 5625;
				break;
			}
			x = (xres + 31) * 8;
			y = x * aspect / 10000;
			printf("\t%dx%d%c\t%d Hz\n", x, y,
			       x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
			have_timing = 1;
		}
	}

	/* Detailed timing information. */
	for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
			i++) {
		edid_print_dtd(&edid_info->monitor_details.descriptor[i],
			       &have_timing);
	}

	if (!have_timing)
		printf("\tNone\n");
}
Commit	Line	Data
d46b5f7d TWHT	1	/*
	2	* Copyright (c) 2012 The Chromium OS Authors.
	3	*
	4	* (C) Copyright 2010
	5	* Petr Stetiar <ynezz@true.cz>
	6	*
1a459660	7	* SPDX-License-Identifier: GPL-2.0+
d46b5f7d TWHT	8	*
	9	* Contains stolen code from ddcprobe project which is:
	10	* Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
d46b5f7d TWHT	11	*/
	12
	13	#include <common.h>
	14	#include <edid.h>
e745d064	15	#include <errno.h>
00cf1167	16	#include <fdtdec.h>
d46b5f7d TWHT	17	#include <linux/ctype.h>
	18	#include <linux/string.h>
	19
	20	int edid_check_info(struct edid1_info *edid_info)
	21	{
	22	if ((edid_info == NULL) \|\| (edid_info->version == 0))
	23	return -1;
	24
	25	if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
	26	return -1;
	27
	28	if (edid_info->version == 0xff && edid_info->revision == 0xff)
	29	return -1;
	30
	31	return 0;
	32	}
	33
e745d064 HG	34	int edid_check_checksum(u8 *edid_block)
	35	{
	36	u8 checksum = 0;
	37	int i;
	38
	39	for (i = 0; i < 128; i++)
	40	checksum += edid_block[i];
	41
	42	return (checksum == 0) ? 0 : -EINVAL;
	43	}
	44
d46b5f7d TWHT	45	int edid_get_ranges(struct edid1_info edid, unsigned int hmin,
	46	unsigned int hmax, unsigned int vmin,
	47	unsigned int *vmax)
	48	{
	49	int i;
	50	struct edid_monitor_descriptor *monitor;
	51
	52	hmin = hmax = vmin = vmax = 0;
	53	if (edid_check_info(edid))
	54	return -1;
	55
	56	for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
	57	monitor = &edid->monitor_details.descriptor[i];
	58	if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
	59	*hmin = monitor->data.range_data.horizontal_min;
	60	*hmax = monitor->data.range_data.horizontal_max;
	61	*vmin = monitor->data.range_data.vertical_min;
	62	*vmax = monitor->data.range_data.vertical_max;
	63	return 0;
	64	}
	65	}
	66	return -1;
	67	}
	68
00cf1167 SG	69	/* Set all parts of a timing entry to the same value */
	70	static void set_entry(struct timing_entry *entry, u32 value)
	71	{
	72	entry->min = value;
	73	entry->typ = value;
	74	entry->max = value;
	75	}
	76
	77	/**
	78	* decode_timing() - Decoding an 18-byte detailed timing record
	79	*
	80	* @buf: Pointer to EDID detailed timing record
	81	* @timing: Place to put timing
	82	*/
	83	static void decode_timing(u8 buf, struct display_timing timing)
	84	{
	85	uint x_mm, y_mm;
	86	unsigned int ha, hbl, hso, hspw, hborder;
	87	unsigned int va, vbl, vso, vspw, vborder;
	88
	89	/* Edid contains pixel clock in terms of 10KHz */
	90	set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000);
	91	x_mm = (buf[12] + ((buf[14] & 0xf0) << 4));
	92	y_mm = (buf[13] + ((buf[14] & 0x0f) << 8));
	93	ha = (buf[2] + ((buf[4] & 0xf0) << 4));
	94	hbl = (buf[3] + ((buf[4] & 0x0f) << 8));
	95	hso = (buf[8] + ((buf[11] & 0xc0) << 2));
	96	hspw = (buf[9] + ((buf[11] & 0x30) << 4));
	97	hborder = buf[15];
	98	va = (buf[5] + ((buf[7] & 0xf0) << 4));
	99	vbl = (buf[6] + ((buf[7] & 0x0f) << 8));
	100	vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2));
	101	vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4));
	102	vborder = buf[16];
	103
	104	set_entry(&timing->hactive, ha);
	105	set_entry(&timing->hfront_porch, hso);
	106	set_entry(&timing->hback_porch, hbl - hso - hspw);
	107	set_entry(&timing->hsync_len, hspw);
	108
	109	set_entry(&timing->vactive, va);
	110	set_entry(&timing->vfront_porch, vso);
	111	set_entry(&timing->vback_porch, vbl - vso - vspw);
	112	set_entry(&timing->vsync_len, vspw);
	113
	114	debug("Detailed mode clock %u Hz, %d mm x %d mm\n"
	115	" %04x %04x %04x %04x hborder %x\n"
	116	" %04x %04x %04x %04x vborder %x\n",
	117	timing->pixelclock.typ,
	118	x_mm, y_mm,
	119	ha, ha + hso, ha + hso + hspw,
	120	ha + hbl, hborder,
	121	va, va + vso, va + vso + vspw,
	122	va + vbl, vborder);
	123	}
	124
	125	int edid_get_timing(u8 buf, int buf_size, struct display_timing timing,
	126	int *panel_bits_per_colourp)
	127	{
	128	struct edid1_info edid = (struct edid1_info )buf;
	129	bool timing_done;
	130	int i;
	131
	132	if (buf_size < sizeof(*edid) \|\| edid_check_info(edid)) {
133	debug("%s: Invalid buffer\n", __func__);
134	return -EINVAL;
135	}
136
137	if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) {
138	debug("%s: No preferred timing\n", __func__);
139	return -ENOENT;
140	}
141
142	/* Look for detailed timing */
143	timing_done = false;
144	for (i = 0; i < 4; i++) {
145	struct edid_monitor_descriptor *desc;
146
147	desc = &edid->monitor_details.descriptor[i];
148	if (desc->zero_flag_1 != 0) {
149	decode_timing((u8 *)desc, timing);
150	timing_done = true;
151	break;
152	}
153	}
154	if (!timing_done)
155	return -EINVAL;
156
157	if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) {
158	debug("%s: Not a digital display\n", __func__);
159	return -ENOSYS;
160	}
161	if (edid->version != 1 \|\| edid->revision < 4) {
162	debug("%s: EDID version %d.%d does not have required info\n",
163	__func__, edid->version, edid->revision);
164	*panel_bits_per_colourp = -1;
165	} else {
166	*panel_bits_per_colourp =
167	((edid->video_input_definition & 0x70) >> 3) + 4;
168	}
169
170	return 0;
171	}
172
d46b5f7d TWHT	173	/**
	174	* Snip the tailing whitespace/return of a string.
	175	*
	176	* @param string The string to be snipped
	177	* @return the snipped string
	178	*/
	179	static char snip(char string)
	180	{
	181	char *s;
	182
	183	/*
	184	* This is always a 13 character buffer
	185	* and it's not always terminated.
	186	*/
	187	string[12] = '\0';
	188	s = &string[strlen(string) - 1];
	189
	190	while (s >= string && (isspace(s) \|\| s == '\n' \|\| *s == '\r' \|\|
	191	*s == '\0'))
	192	*(s--) = '\0';
	193
	194	return string;
	195	}
	196
	197	/**
	198	* Print an EDID monitor descriptor block
	199	*
	200	* @param monitor The EDID monitor descriptor block
	201	* @have_timing Modifies to 1 if the desciptor contains timing info
	202	*/
	203	static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
	204	unsigned int *have_timing)
	205	{
	206	unsigned char bytes = (unsigned char )monitor;
	207	struct edid_detailed_timing *timing =
	208	(struct edid_detailed_timing *)monitor;
	209
	210	if (bytes[0] == 0 && bytes[1] == 0) {
	211	if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
	212	printf("Monitor serial number: %s\n",
	213	snip(monitor->data.string));
	214	else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
	215	printf("Monitor ID: %s\n",
	216	snip(monitor->data.string));
	217	else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
	218	printf("Monitor name: %s\n",
	219	snip(monitor->data.string));
	220	else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
	221	printf("Monitor range limits, horizontal sync: "
	222	"%d-%d kHz, vertical refresh: "
	223	"%d-%d Hz, max pixel clock: "
	224	"%d MHz\n",
	225	monitor->data.range_data.horizontal_min,
	226	monitor->data.range_data.horizontal_max,
	227	monitor->data.range_data.vertical_min,
	228	monitor->data.range_data.vertical_max,
	229	monitor->data.range_data.pixel_clock_max * 10);
	230	} else {
	231	uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
	232	uint32_t h_total, v_total, vfreq;
	233
	234	pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
	235	h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
	236	h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
237	v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
238	v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
239
240	h_total = h_active + h_blanking;
241	v_total = v_active + v_blanking;
242	if (v_total * h_total)
243	vfreq = pixclock / (v_total * h_total);
244	else
245	vfreq = 1; /* Error case */
246	printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
247	v_active, h_active > 1000 ? ' ' : '\t', vfreq);
248	*have_timing = 1;
249	}
250	}
251
252	/**
253	* Get the manufacturer name from an EDID info.
254	*
255	* @param edid_info The EDID info to be printed
256	* @param name Returns the string of the manufacturer name
257	*/
258	static void edid_get_manufacturer_name(struct edid1_info edid, char name)
259	{
260	name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
261	name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
262	name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
263	name[3] = '\0';
264	}
265
266	void edid_print_info(struct edid1_info *edid_info)
267	{
268	int i;
269	char manufacturer[4];
270	unsigned int have_timing = 0;
271	uint32_t serial_number;
272
273	if (edid_check_info(edid_info)) {
274	printf("Not a valid EDID\n");
275	return;
276	}
277
278	printf("EDID version: %d.%d\n",
279	edid_info->version, edid_info->revision);
280
281	printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
282
283	edid_get_manufacturer_name(edid_info, manufacturer);
284	printf("Manufacturer: %s\n", manufacturer);
285
286	serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
287	if (serial_number != 0xffffffff) {
288	if (strcmp(manufacturer, "MAG") == 0)
289	serial_number -= 0x7000000;
290	if (strcmp(manufacturer, "OQI") == 0)
291	serial_number -= 456150000;
292	if (strcmp(manufacturer, "VSC") == 0)
293	serial_number -= 640000000;
294	}
295	printf("Serial number: %08x\n", serial_number);
296	printf("Manufactured in week: %d year: %d\n",
297	edid_info->week, edid_info->year + 1990);
298
299	printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
300	EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
301	"digital signal, " : "analog signal, ",
302	EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
303	EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
304	", blank to black" : "",
305	EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
306	", separate sync" : "",
307	EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
308	", composite sync" : "",
309	EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
310	", sync on green" : "",
311	EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
312	", serration v" : "");
313
314	printf("Monitor is %s\n",
315	EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
316
317	printf("Maximum visible display size: %d cm x %d cm\n",
318	edid_info->max_size_horizontal,
319	edid_info->max_size_vertical);
320
321	printf("Power management features: %s%s, %s%s, %s%s\n",
322	EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
323	"" : "no ", "active off",
324	EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
325	EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
326
327	printf("Estabilished timings:\n");
328	if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
329	printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
330	if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
331	printf("\t720x400\t\t88 Hz (XGA2)\n");
332	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
333	printf("\t640x480\t\t60 Hz (VGA)\n");
334	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
335	printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
336	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
337	printf("\t640x480\t\t72 Hz (VESA)\n");
338	if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
339	printf("\t640x480\t\t75 Hz (VESA)\n");
340	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
341	printf("\t800x600\t\t56 Hz (VESA)\n");
342	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
343	printf("\t800x600\t\t60 Hz (VESA)\n");
344	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
345	printf("\t800x600\t\t72 Hz (VESA)\n");
346	if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
347	printf("\t800x600\t\t75 Hz (VESA)\n");
348	if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
349	printf("\t832x624\t\t75 Hz (Mac II)\n");
350	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
351	printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
352	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
353	printf("\t1024x768\t60 Hz (VESA)\n");
354	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
355	printf("\t1024x768\t70 Hz (VESA)\n");
356	if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
357	printf("\t1024x768\t75 Hz (VESA)\n");
358	if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
359	printf("\t1280x1024\t75 (VESA)\n");
360	if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
361	printf("\t1152x870\t75 (Mac II)\n");
362
363	/* Standard timings. */
364	printf("Standard timings:\n");
365	for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
366	unsigned int aspect = 10000;
367	unsigned int x, y;
368	unsigned char xres, vfreq;
369
370	xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
371	vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
372	if ((xres != vfreq) \|\|
373	((xres != 0) && (xres != 1)) \|\|
374	((vfreq != 0) && (vfreq != 1))) {
375	switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
376	i)) {
377	case ASPECT_625:
378	aspect = 6250;
379	break;
380	case ASPECT_75:
381	aspect = 7500;
382	break;
383	case ASPECT_8:
384	aspect = 8000;
385	break;
386	case ASPECT_5625:
387	aspect = 5625;
388	break;
389	}
390	x = (xres + 31) * 8;
391	y = x * aspect / 10000;
392	printf("\t%dx%d%c\t%d Hz\n", x, y,
393	x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
394	have_timing = 1;
395	}
396	}
397
398	/* Detailed timing information. */
399	for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
400	i++) {
401	edid_print_dtd(&edid_info->monitor_details.descriptor[i],
402	&have_timing);
403	}
404
405	if (!have_timing)
406	printf("\tNone\n");
407	}