/* * 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"); }