482 lines
14 KiB
C
482 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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* 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 <fdtdec.h>
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#include <log.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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/* Set all parts of a timing entry to the same value */
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static void set_entry(struct timing_entry *entry, u32 value)
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{
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entry->min = value;
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entry->typ = value;
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entry->max = value;
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}
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/**
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* decode_timing() - Decoding an 18-byte detailed timing record
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*
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* @buf: Pointer to EDID detailed timing record
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* @timing: Place to put timing
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*/
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static void decode_timing(u8 *buf, struct display_timing *timing)
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{
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uint x_mm, y_mm;
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unsigned int ha, hbl, hso, hspw, hborder;
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unsigned int va, vbl, vso, vspw, vborder;
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struct edid_detailed_timing *t = (struct edid_detailed_timing *)buf;
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/* Edid contains pixel clock in terms of 10KHz */
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set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000);
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x_mm = (buf[12] + ((buf[14] & 0xf0) << 4));
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y_mm = (buf[13] + ((buf[14] & 0x0f) << 8));
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ha = (buf[2] + ((buf[4] & 0xf0) << 4));
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hbl = (buf[3] + ((buf[4] & 0x0f) << 8));
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hso = (buf[8] + ((buf[11] & 0xc0) << 2));
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hspw = (buf[9] + ((buf[11] & 0x30) << 4));
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hborder = buf[15];
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va = (buf[5] + ((buf[7] & 0xf0) << 4));
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vbl = (buf[6] + ((buf[7] & 0x0f) << 8));
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vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2));
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vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4));
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vborder = buf[16];
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set_entry(&timing->hactive, ha);
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set_entry(&timing->hfront_porch, hso);
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set_entry(&timing->hback_porch, hbl - hso - hspw);
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set_entry(&timing->hsync_len, hspw);
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set_entry(&timing->vactive, va);
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set_entry(&timing->vfront_porch, vso);
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set_entry(&timing->vback_porch, vbl - vso - vspw);
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set_entry(&timing->vsync_len, vspw);
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timing->flags = 0;
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if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t))
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timing->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
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else
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timing->flags |= DISPLAY_FLAGS_HSYNC_LOW;
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if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t))
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timing->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
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else
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timing->flags |= DISPLAY_FLAGS_VSYNC_LOW;
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if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t))
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timing->flags = DISPLAY_FLAGS_INTERLACED;
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debug("Detailed mode clock %u Hz, %d mm x %d mm\n"
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" %04x %04x %04x %04x hborder %x\n"
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" %04x %04x %04x %04x vborder %x\n",
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timing->pixelclock.typ,
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x_mm, y_mm,
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ha, ha + hso, ha + hso + hspw,
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ha + hbl, hborder,
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va, va + vso, va + vso + vspw,
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va + vbl, vborder);
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}
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/**
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* Check if HDMI vendor specific data block is present in CEA block
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* @param info CEA extension block
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* @return true if block is found
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*/
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static bool cea_is_hdmi_vsdb_present(struct edid_cea861_info *info)
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{
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u8 end, i = 0;
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/* check for end of data block */
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end = info->dtd_offset;
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if (end == 0)
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end = sizeof(info->data);
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if (end < 4 || end > sizeof(info->data))
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return false;
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end -= 4;
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while (i < end) {
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/* Look for vendor specific data block of appropriate size */
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if ((EDID_CEA861_DB_TYPE(*info, i) == EDID_CEA861_DB_VENDOR) &&
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(EDID_CEA861_DB_LEN(*info, i) >= 5)) {
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u8 *db = &info->data[i + 1];
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u32 oui = db[0] | (db[1] << 8) | (db[2] << 16);
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if (oui == HDMI_IEEE_OUI)
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return true;
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}
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i += EDID_CEA861_DB_LEN(*info, i) + 1;
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}
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return false;
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}
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int edid_get_timing_validate(u8 *buf, int buf_size,
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struct display_timing *timing,
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int *panel_bits_per_colourp,
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bool (*mode_valid)(void *priv,
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const struct display_timing *timing),
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void *mode_valid_priv)
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{
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struct edid1_info *edid = (struct edid1_info *)buf;
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bool timing_done;
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int i;
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if (buf_size < sizeof(*edid) || edid_check_info(edid)) {
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debug("%s: Invalid buffer\n", __func__);
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return -EINVAL;
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}
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if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) {
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debug("%s: No preferred timing\n", __func__);
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return -ENOENT;
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}
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/* Look for detailed timing */
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timing_done = false;
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for (i = 0; i < 4; i++) {
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struct edid_monitor_descriptor *desc;
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desc = &edid->monitor_details.descriptor[i];
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if (desc->zero_flag_1 != 0) {
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decode_timing((u8 *)desc, timing);
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if (mode_valid)
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timing_done = mode_valid(mode_valid_priv,
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timing);
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else
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timing_done = true;
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if (timing_done)
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break;
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}
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}
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if (!timing_done)
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return -EINVAL;
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if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) {
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debug("%s: Not a digital display\n", __func__);
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return -ENOSYS;
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}
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if (edid->version != 1 || edid->revision < 4) {
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debug("%s: EDID version %d.%d does not have required info\n",
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__func__, edid->version, edid->revision);
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*panel_bits_per_colourp = -1;
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} else {
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*panel_bits_per_colourp =
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((edid->video_input_definition & 0x70) >> 3) + 4;
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}
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timing->hdmi_monitor = false;
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if (edid->extension_flag && (buf_size >= EDID_EXT_SIZE)) {
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struct edid_cea861_info *info =
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(struct edid_cea861_info *)(buf + sizeof(*edid));
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if (info->extension_tag == EDID_CEA861_EXTENSION_TAG)
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timing->hdmi_monitor = cea_is_hdmi_vsdb_present(info);
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}
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return 0;
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}
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int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing,
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int *panel_bits_per_colourp)
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{
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return edid_get_timing_validate(buf, buf_size, timing,
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panel_bits_per_colourp, NULL, NULL);
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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 > 0 && h_total > 0)
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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");
|
|
|
|
/* 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");
|
|
}
|