On 30.03.2017 11:09, Abdiel Janulgue wrote:
> Sanity check the edid block generation capabilities.
>
> Cc: Petri Latvala <petri.latvala@xxxxxxxxx>
Ping!
> Signed-off-by: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
> ---
> lib/tests/Makefile.sources | 1 +
> lib/tests/igt_hdmi_inject.c | 96 +++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 97 insertions(+)
> create mode 100644 lib/tests/igt_hdmi_inject.c
>
> diff --git a/lib/tests/Makefile.sources b/lib/tests/Makefile.sources
> index 3fcfe14..4cfc0a5 100644
> --- a/lib/tests/Makefile.sources
> +++ b/lib/tests/Makefile.sources
> @@ -13,6 +13,7 @@ check_prog_list = \
> igt_subtest_group \
> igt_assert \
> igt_exit_handler \
> + igt_hdmi_inject \
> $(NULL)
>
> TESTS = \
> diff --git a/lib/tests/igt_hdmi_inject.c b/lib/tests/igt_hdmi_inject.c
> new file mode 100644
> index 0000000..9b6780a
> --- /dev/null
> +++ b/lib/tests/igt_hdmi_inject.c
> @@ -0,0 +1,96 @@
> +/*
> + * 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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