e745d064b4
Add a helper function to check the checksum of an EDID data block. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Anatolij Gustschin <agust@denx.de>
303 lines
9.3 KiB
C
303 lines
9.3 KiB
C
/*
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* Copyright (c) 2012 The Chromium OS Authors.
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*
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* (C) Copyright 2010
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* Petr Stetiar <ynezz@true.cz>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Contains stolen code from ddcprobe project which is:
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* Copyright (C) Nalin Dahyabhai <bigfun@pobox.com>
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*/
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#include <common.h>
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#include <edid.h>
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#include <errno.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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int edid_check_info(struct edid1_info *edid_info)
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{
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if ((edid_info == NULL) || (edid_info->version == 0))
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return -1;
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if (memcmp(edid_info->header, "\x0\xff\xff\xff\xff\xff\xff\x0", 8))
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return -1;
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if (edid_info->version == 0xff && edid_info->revision == 0xff)
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return -1;
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return 0;
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}
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int edid_check_checksum(u8 *edid_block)
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{
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u8 checksum = 0;
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int i;
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for (i = 0; i < 128; i++)
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checksum += edid_block[i];
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return (checksum == 0) ? 0 : -EINVAL;
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}
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int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin,
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unsigned int *hmax, unsigned int *vmin,
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unsigned int *vmax)
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{
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int i;
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struct edid_monitor_descriptor *monitor;
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*hmin = *hmax = *vmin = *vmax = 0;
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if (edid_check_info(edid))
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return -1;
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for (i = 0; i < ARRAY_SIZE(edid->monitor_details.descriptor); i++) {
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monitor = &edid->monitor_details.descriptor[i];
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if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE) {
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*hmin = monitor->data.range_data.horizontal_min;
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*hmax = monitor->data.range_data.horizontal_max;
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*vmin = monitor->data.range_data.vertical_min;
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*vmax = monitor->data.range_data.vertical_max;
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return 0;
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}
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}
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return -1;
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}
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/**
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* Snip the tailing whitespace/return of a string.
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*
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* @param string The string to be snipped
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* @return the snipped string
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*/
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static char *snip(char *string)
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{
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char *s;
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/*
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* This is always a 13 character buffer
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* and it's not always terminated.
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*/
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string[12] = '\0';
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s = &string[strlen(string) - 1];
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while (s >= string && (isspace(*s) || *s == '\n' || *s == '\r' ||
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*s == '\0'))
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*(s--) = '\0';
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return string;
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}
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/**
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* Print an EDID monitor descriptor block
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*
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* @param monitor The EDID monitor descriptor block
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* @have_timing Modifies to 1 if the desciptor contains timing info
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*/
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static void edid_print_dtd(struct edid_monitor_descriptor *monitor,
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unsigned int *have_timing)
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{
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unsigned char *bytes = (unsigned char *)monitor;
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struct edid_detailed_timing *timing =
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(struct edid_detailed_timing *)monitor;
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if (bytes[0] == 0 && bytes[1] == 0) {
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if (monitor->type == EDID_MONITOR_DESCRIPTOR_SERIAL)
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printf("Monitor serial number: %s\n",
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snip(monitor->data.string));
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else if (monitor->type == EDID_MONITOR_DESCRIPTOR_ASCII)
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printf("Monitor ID: %s\n",
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snip(monitor->data.string));
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else if (monitor->type == EDID_MONITOR_DESCRIPTOR_NAME)
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printf("Monitor name: %s\n",
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snip(monitor->data.string));
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else if (monitor->type == EDID_MONITOR_DESCRIPTOR_RANGE)
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printf("Monitor range limits, horizontal sync: "
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"%d-%d kHz, vertical refresh: "
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"%d-%d Hz, max pixel clock: "
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"%d MHz\n",
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monitor->data.range_data.horizontal_min,
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monitor->data.range_data.horizontal_max,
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monitor->data.range_data.vertical_min,
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monitor->data.range_data.vertical_max,
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monitor->data.range_data.pixel_clock_max * 10);
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} else {
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uint32_t pixclock, h_active, h_blanking, v_active, v_blanking;
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uint32_t h_total, v_total, vfreq;
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pixclock = EDID_DETAILED_TIMING_PIXEL_CLOCK(*timing);
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h_active = EDID_DETAILED_TIMING_HORIZONTAL_ACTIVE(*timing);
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h_blanking = EDID_DETAILED_TIMING_HORIZONTAL_BLANKING(*timing);
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v_active = EDID_DETAILED_TIMING_VERTICAL_ACTIVE(*timing);
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v_blanking = EDID_DETAILED_TIMING_VERTICAL_BLANKING(*timing);
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h_total = h_active + h_blanking;
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v_total = v_active + v_blanking;
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if (v_total * h_total)
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vfreq = pixclock / (v_total * h_total);
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else
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vfreq = 1; /* Error case */
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printf("\t%dx%d\%c\t%d Hz (detailed)\n", h_active,
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v_active, h_active > 1000 ? ' ' : '\t', vfreq);
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*have_timing = 1;
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}
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}
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/**
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* Get the manufacturer name from an EDID info.
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*
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* @param edid_info The EDID info to be printed
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* @param name Returns the string of the manufacturer name
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*/
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static void edid_get_manufacturer_name(struct edid1_info *edid, char *name)
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{
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name[0] = EDID1_INFO_MANUFACTURER_NAME_CHAR1(*edid) + 'A' - 1;
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name[1] = EDID1_INFO_MANUFACTURER_NAME_CHAR2(*edid) + 'A' - 1;
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name[2] = EDID1_INFO_MANUFACTURER_NAME_CHAR3(*edid) + 'A' - 1;
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name[3] = '\0';
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}
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void edid_print_info(struct edid1_info *edid_info)
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{
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int i;
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char manufacturer[4];
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unsigned int have_timing = 0;
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uint32_t serial_number;
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if (edid_check_info(edid_info)) {
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printf("Not a valid EDID\n");
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return;
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}
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printf("EDID version: %d.%d\n",
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edid_info->version, edid_info->revision);
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printf("Product ID code: %04x\n", EDID1_INFO_PRODUCT_CODE(*edid_info));
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edid_get_manufacturer_name(edid_info, manufacturer);
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printf("Manufacturer: %s\n", manufacturer);
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serial_number = EDID1_INFO_SERIAL_NUMBER(*edid_info);
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if (serial_number != 0xffffffff) {
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if (strcmp(manufacturer, "MAG") == 0)
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serial_number -= 0x7000000;
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if (strcmp(manufacturer, "OQI") == 0)
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serial_number -= 456150000;
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if (strcmp(manufacturer, "VSC") == 0)
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serial_number -= 640000000;
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}
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printf("Serial number: %08x\n", serial_number);
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printf("Manufactured in week: %d year: %d\n",
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edid_info->week, edid_info->year + 1990);
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printf("Video input definition: %svoltage level %d%s%s%s%s%s\n",
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EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid_info) ?
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"digital signal, " : "analog signal, ",
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EDID1_INFO_VIDEO_INPUT_VOLTAGE_LEVEL(*edid_info),
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EDID1_INFO_VIDEO_INPUT_BLANK_TO_BLACK(*edid_info) ?
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", blank to black" : "",
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EDID1_INFO_VIDEO_INPUT_SEPARATE_SYNC(*edid_info) ?
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", separate sync" : "",
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EDID1_INFO_VIDEO_INPUT_COMPOSITE_SYNC(*edid_info) ?
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", composite sync" : "",
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EDID1_INFO_VIDEO_INPUT_SYNC_ON_GREEN(*edid_info) ?
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", sync on green" : "",
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EDID1_INFO_VIDEO_INPUT_SERRATION_V(*edid_info) ?
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", serration v" : "");
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printf("Monitor is %s\n",
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EDID1_INFO_FEATURE_RGB(*edid_info) ? "RGB" : "non-RGB");
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printf("Maximum visible display size: %d cm x %d cm\n",
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edid_info->max_size_horizontal,
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edid_info->max_size_vertical);
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printf("Power management features: %s%s, %s%s, %s%s\n",
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EDID1_INFO_FEATURE_ACTIVE_OFF(*edid_info) ?
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"" : "no ", "active off",
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EDID1_INFO_FEATURE_SUSPEND(*edid_info) ? "" : "no ", "suspend",
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EDID1_INFO_FEATURE_STANDBY(*edid_info) ? "" : "no ", "standby");
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printf("Estabilished timings:\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_720X400_70(*edid_info))
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printf("\t720x400\t\t70 Hz (VGA 640x400, IBM)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_720X400_88(*edid_info))
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printf("\t720x400\t\t88 Hz (XGA2)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_640X480_60(*edid_info))
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printf("\t640x480\t\t60 Hz (VGA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_640X480_67(*edid_info))
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printf("\t640x480\t\t67 Hz (Mac II, Apple)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_640X480_72(*edid_info))
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printf("\t640x480\t\t72 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_640X480_75(*edid_info))
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printf("\t640x480\t\t75 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_800X600_56(*edid_info))
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printf("\t800x600\t\t56 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_800X600_60(*edid_info))
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printf("\t800x600\t\t60 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_800X600_72(*edid_info))
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printf("\t800x600\t\t72 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_800X600_75(*edid_info))
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printf("\t800x600\t\t75 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_832X624_75(*edid_info))
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printf("\t832x624\t\t75 Hz (Mac II)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_87I(*edid_info))
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printf("\t1024x768\t87 Hz Interlaced (8514A)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_60(*edid_info))
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printf("\t1024x768\t60 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_70(*edid_info))
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printf("\t1024x768\t70 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_1024X768_75(*edid_info))
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printf("\t1024x768\t75 Hz (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_1280X1024_75(*edid_info))
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printf("\t1280x1024\t75 (VESA)\n");
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if (EDID1_INFO_ESTABLISHED_TIMING_1152X870_75(*edid_info))
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printf("\t1152x870\t75 (Mac II)\n");
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/* Standard timings. */
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printf("Standard timings:\n");
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for (i = 0; i < ARRAY_SIZE(edid_info->standard_timings); i++) {
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unsigned int aspect = 10000;
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unsigned int x, y;
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unsigned char xres, vfreq;
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xres = EDID1_INFO_STANDARD_TIMING_XRESOLUTION(*edid_info, i);
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vfreq = EDID1_INFO_STANDARD_TIMING_VFREQ(*edid_info, i);
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if ((xres != vfreq) ||
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((xres != 0) && (xres != 1)) ||
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((vfreq != 0) && (vfreq != 1))) {
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switch (EDID1_INFO_STANDARD_TIMING_ASPECT(*edid_info,
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i)) {
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case ASPECT_625:
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aspect = 6250;
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break;
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case ASPECT_75:
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aspect = 7500;
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break;
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case ASPECT_8:
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aspect = 8000;
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break;
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case ASPECT_5625:
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aspect = 5625;
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break;
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}
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x = (xres + 31) * 8;
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y = x * aspect / 10000;
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printf("\t%dx%d%c\t%d Hz\n", x, y,
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x > 1000 ? ' ' : '\t', (vfreq & 0x3f) + 60);
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have_timing = 1;
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}
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}
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/* Detailed timing information. */
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for (i = 0; i < ARRAY_SIZE(edid_info->monitor_details.descriptor);
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i++) {
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edid_print_dtd(&edid_info->monitor_details.descriptor[i],
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&have_timing);
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}
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if (!have_timing)
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printf("\tNone\n");
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}
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