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/* $Id: edid.c $ */
/** @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 <airlied@redhat.com>
* Michael Thayer <michael.thayer@oracle.com>
*/
#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;
}
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