From d46b5f7dcbf294141d6bba1dc8e2b98d742d0562 Mon Sep 17 00:00:00 2001 From: Tom Wai-Hong Tam Date: Wed, 5 Dec 2012 14:46:39 +0000 Subject: 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 Signed-off-by: Simon Glass --- common/Makefile | 1 + common/edid.c | 307 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 308 insertions(+) create mode 100644 common/edid.c (limited to 'common') diff --git a/common/Makefile b/common/Makefile index ce5ee6eb89..ebb7635d5f 100644 --- a/common/Makefile +++ b/common/Makefile @@ -188,6 +188,7 @@ COBJS-$(CONFIG_BOOTSTAGE) += bootstage.o COBJS-$(CONFIG_CONSOLE_MUX) += iomux.o COBJS-y += flash.o COBJS-$(CONFIG_CMD_KGDB) += kgdb.o kgdb_stubs.o +COBJS-$(CONFIG_I2C_EDID) += edid.o COBJS-$(CONFIG_KALLSYMS) += kallsyms.o COBJS-$(CONFIG_LCD) += lcd.o COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o diff --git a/common/edid.c b/common/edid.c new file mode 100644 index 0000000000..c82c298097 --- /dev/null +++ b/common/edid.c @@ -0,0 +1,307 @@ +/* + * Copyright (c) 2012 The Chromium OS Authors. + * + * (C) Copyright 2010 + * Petr Stetiar + * + * 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 + * + */ + +#include +#include +#include +#include + +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"); +} -- cgit v1.2.3