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link/graphics: Add support for EDID

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This code is taken from an EDID reader written at Red Hat.

The key function is
int decode_edid(unsigned char *edid, int size, struct edid *out)

Which takes a pointer to an EDID blob, and a size, and decodes it into
a machine-independent format in out, which may be used for driving
chipsets. The EDID blob might come for IO, or a compiled-in EDID
BLOB, or CBFS.

Also included are the changes needed to use the EDID code on Link.

Change-Id: I66b275b8ed28fd77cfa5978bdec1eeef9e9425f1
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/2837
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Ronald G. Minnich
2013-03-13 14:35:01 -07:00
committed by Stefan Reinauer
parent a95a13bd47
commit b3b72f350e
5 changed files with 1857 additions and 362 deletions
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66
src/include/edid.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef EDID_H
#define EDID_H
/* structure for communicating EDID information from a raw EDID block to
* higher level functions.
* The size of the data types is not critical, so we leave them as
* unsigned int. We can move more into into this struct as needed.
*/
struct edid {
char manuf_name[4];
unsigned int model;
unsigned int serial;
unsigned int year;
unsigned int week;
unsigned int version[2];
unsigned int nonconformant;
unsigned int type;
unsigned int bpp;
unsigned int voltage;
unsigned int sync;
unsigned int xsize_cm;
unsigned int ysize_cm;
/* used to compute timing for graphics chips. */
unsigned char phsync;
unsigned char pvsync;
unsigned int ha;
unsigned int hbl;
unsigned int hso;
unsigned int hspw;
unsigned int hborder;
unsigned int va;
unsigned int vbl;
unsigned int vso;
unsigned int vspw;
unsigned int vborder;
/* it is unlikely we need these things. */
/* if one of these is non-zero, use that one. */
unsigned int aspect_landscape;
unsigned int aspect_portrait;
const char *range_class;
const char *syncmethod;
const char *stereo;
};
int decode_edid(unsigned char *edid, int size, struct edid *out);
#endif /* EDID_H */