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/*
* Copyright © 2017 Intel Corporation
*
* 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.
*
*/
#include "igt.h"
static const unsigned char edid_header[] = {
0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00
};
/**
* Sanity check the header of the base EDID block.
*
* Return: 8 if the header is perfect, down to 0 if it's totally wrong.
*/
static int edid_header_is_valid(const unsigned char *raw_edid)
{
int i, score = 0;
for (i = 0; i < sizeof(edid_header); i++)
if (raw_edid[i] == edid_header[i])
score++;
return score;
}
/**
* Sanity check the checksum of the EDID block.
*
* Return: 0 if the block is perfect.
* See byte 127 of spec
* https://en.wikipedia.org/wiki/Extended_Display_Identification_Data#EDID_1.3_data_format
*/
static int edid_block_checksum(const unsigned char *raw_edid)
{
int i;
unsigned char csum = 0;
for (i = 0; i < EDID_LENGTH; i++) {
csum += raw_edid[i];
}
return csum;
}
typedef void (*hdmi_inject_func)(const unsigned char *edid, size_t length,
unsigned char *new_edid_ptr[], size_t *new_length);
igt_simple_main
{
const struct {
const char *desc;
hdmi_inject_func inject;
} funcs[] = {
{ "3D", kmstest_edid_add_3d },
{ "4k", kmstest_edid_add_4k },
{ "audio", kmstest_edid_add_audio },
{ NULL, NULL },
}, *f;
for (f = funcs; f->inject; f++) {
unsigned char *edid;
size_t length;
f->inject(igt_kms_get_base_edid(), EDID_LENGTH, &edid,
&length);
igt_assert_f(edid_header_is_valid(edid) == 8,
"invalid header on HDMI %s", f->desc);
/* check base edid block */
igt_assert_f(edid_block_checksum(edid) == 0,
"checksum failed on HDMI %s", f->desc);
/* check extension block */
igt_assert_f(edid_block_checksum(edid + EDID_LENGTH) == 0,
"CEA block checksum failed on HDMI %s", f->desc);
}
}
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