leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
605bd75af5
u-boot/common/edid.c
Tom Wai-Hong Tam d46b5f7dcb edid: Library of EDID decode and print 
This implements a library for accessing EDID data from an LCD panel.
This is used to obtain information about the panel such as its
resolution and type.

This is a tidied-up version of the original code pulled from
https://github.com/ynezz/u-boot-edid.

The changes we made are:
 - removed bit fields in the struct;
 - removed endianness cases in the struct;
 - fixed some wrong definitions;
 - fixed to fit 80 columns;
 - fixed some code styles.

Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
2012-12-11 13:17:34 -07:00

308 lines
9.8 KiB
C
Raw Blame History

/*
* Copyright (c) 2012 The Chromium OS Authors.
*
* (C) Copyright 2010
* Petr Stetiar <ynezz@true.cz>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Contains stolen code from ddcprobe project which is:
* Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
*
*/
#include <common.h>
#include <edid.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_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;
}
/**
* 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");
}
Reference in New Issue View Git Blame Copy Permalink