Sanity check the edid block generation capabilities.
Cc: Petri Latvala <petri.latv...@intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janul...@linux.intel.com>
---
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);
+ }
+}
--
2.7.4
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