/* $Id: edid.c 96407 2022-08-22 17:43:14Z vboxsync $ */ /** @file * * Linux Additions X11 graphics driver, EDID construction */ /* * Copyright (C) 2006-2022 Oracle and/or its affiliates. * This file is based on drmmode_display.c from the X.Org xf86-video-intel * driver with the following copyright notice: * * Copyright © 2007 Red Hat, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Authors: * Dave Airlie * Michael Thayer */ #include "misc.h" #include "xf86DDC.h" #include "xf86Crtc.h" #include "vboxvideo.h" enum { EDID_SIZE = 128 }; const unsigned char g_acszEDIDBase[EDID_SIZE] = { 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, /* header */ 0x58, 0x58, /* manufacturer (VBX) */ 0x00, 0x00, /* product code */ 0x00, 0x00,0x00, 0x00, /* serial number goes here */ 0x01, /* week of manufacture */ 0x00, /* year of manufacture */ 0x01, 0x03, /* EDID version */ 0x80, /* capabilities - digital */ 0x00, /* horiz. res in cm, zero for projectors */ 0x00, /* vert. res in cm */ 0x78, /* display gamma (120 == 2.2). Should we ask the host for this? */ 0xEE, /* features (standby, suspend, off, RGB, standard colour space, * preferred timing mode) */ 0xEE, 0x91, 0xA3, 0x54, 0x4C, 0x99, 0x26, 0x0F, 0x50, 0x54, /* chromaticity for standard colour space - should we ask the host? */ 0x00, 0x00, 0x00, /* no default timings */ 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, /* no standard timings */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* descriptor block 1 goes here */ 0x00, 0x00, 0x00, 0xFD, 0x00, /* descriptor block 2, monitor ranges */ 0x00, 0xC8, 0x00, 0xC8, 0x64, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, /* 0-200Hz vertical, 0-200KHz horizontal, 1000MHz pixel clock */ 0x00, 0x00, 0x00, 0xFC, 0x00, /* descriptor block 3, monitor name */ 'V', 'B', 'O', 'X', ' ', 'm', 'o', 'n', 'i', 't', 'o', 'r', '\n', 0x00, 0x00, 0x00, 0x10, 0x00, /* descriptor block 4: dummy data */ 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, /* number of extensions */ 0x00 /* checksum goes here */ }; static void fillDescBlockTimings(unsigned char *pchDescBlock, DisplayModePtr mode) { struct detailed_timings timing; timing.clock = mode->Clock * 1000; timing.h_active = mode->HDisplay; timing.h_blanking = mode->HTotal - mode->HDisplay; timing.v_active = mode->VDisplay; timing.v_blanking = mode->VTotal - mode->VDisplay; timing.h_sync_off = mode->HSyncStart - mode->HDisplay; timing.h_sync_width = mode->HSyncEnd - mode->HSyncStart; timing.v_sync_off = mode->VSyncStart - mode->VDisplay; timing.v_sync_width = mode->VSyncEnd - mode->VSyncStart; pchDescBlock[0] = (timing.clock / 10000) & 0xff; pchDescBlock[1] = (timing.clock / 10000) >> 8; pchDescBlock[2] = timing.h_active & 0xff; pchDescBlock[3] = timing.h_blanking & 0xff; pchDescBlock[4] = (timing.h_active >> 4) & 0xf0; pchDescBlock[4] |= (timing.h_blanking >> 8) & 0xf; pchDescBlock[5] = timing.v_active & 0xff; pchDescBlock[6] = timing.v_blanking & 0xff; pchDescBlock[7] = (timing.v_active >> 4) & 0xf0; pchDescBlock[7] |= (timing.v_blanking >> 8) & 0xf; pchDescBlock[8] = timing.h_sync_off & 0xff; pchDescBlock[9] = timing.h_sync_width & 0xff; pchDescBlock[10] = (timing.v_sync_off << 4) & 0xf0; pchDescBlock[10] |= timing.v_sync_width & 0xf; pchDescBlock[11] = (timing.h_sync_off >> 2) & 0xC0; pchDescBlock[11] |= (timing.h_sync_width >> 4) & 0x30; pchDescBlock[11] |= (timing.v_sync_off >> 2) & 0xC; pchDescBlock[11] |= (timing.v_sync_width >> 4) & 0x3; pchDescBlock[12] = pchDescBlock[13] = pchDescBlock[14] = pchDescBlock[15] = pchDescBlock[16] = pchDescBlock[17] = 0; } static void setEDIDChecksum(unsigned char *pch) { unsigned i, sum = 0; for (i = 0; i < EDID_SIZE - 1; ++i) sum += pch[i]; pch[EDID_SIZE - 1] = (0x100 - (sum & 0xFF)) & 0xFF; } /** * Construct an EDID for an output given a preferred mode. The main reason for * doing this is to confound gnome-settings-deamon which tries to reset the * last mode configuration if the same monitors are plugged in again, which is * a reasonable thing to do but not what we want in a VM. We evily store * the (empty) raw EDID data at the end of the structure so that it gets * freed automatically along with the structure. */ Bool VBOXEDIDSet(xf86OutputPtr output, DisplayModePtr pmode) { unsigned char *pch, *pchEDID; xf86MonPtr pEDIDMon; pch = calloc(1, sizeof(xf86Monitor) + EDID_SIZE); if (!pch) { xf86DrvMsg(output->scrn->scrnIndex, X_ERROR, "Can't allocate memory for EDID structure.\n"); return FALSE; } pchEDID = pch + sizeof(xf86Monitor); memcpy(pchEDID, g_acszEDIDBase, EDID_SIZE); pchEDID[12] = pmode->HDisplay & 0xff; pchEDID[13] = pmode->HDisplay >> 8; pchEDID[14] = pmode->VDisplay & 0xff; pchEDID[15] = pmode->VDisplay >> 8; fillDescBlockTimings(pchEDID + 54, pmode); setEDIDChecksum(pchEDID); pEDIDMon = xf86InterpretEDID(output->scrn->scrnIndex, pchEDID); if (!pEDIDMon) { free(pch); return FALSE; } memcpy(pch, pEDIDMon, sizeof(xf86Monitor)); free(pEDIDMon); pEDIDMon = (xf86MonPtr)pch; xf86OutputSetEDID(output, pEDIDMon); return TRUE; }