[igt-dev] [PATCH i-g-t v2 8/9] lib/igt_edid: add edid_get_mfg

[Simon Ser <simon.ser@intel.com>]

This returns the 3-letter manufacturer identifier of an EDID.

Signed-off-by: Simon Ser <simon.ser@intel.com>
---
 lib/igt_edid.c        | 13 +++++++++++++
 lib/igt_edid.h        |  1 +
 tests/kms_chamelium.c | 10 +++-------
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/lib/igt_edid.c b/lib/igt_edid.c
index 6cc5e7dd42c4..cbb7eefff70d 100644
--- a/lib/igt_edid.c
+++ b/lib/igt_edid.c
@@ -172,6 +172,19 @@ void detailed_timing_set_string(struct detailed_timing *dt,
 		ds->str[len] = '\n';
 }
 
+/**
+ * edid_get_mfg: reads the 3-letter manufacturer identifier
+ *
+ * The string is *not* NULL-terminated.
+ */
+void edid_get_mfg(const struct edid *edid, char out[static 3])
+{
+	out[0] = ((edid->mfg_id[0] & 0x7C) >> 2) + '@';
+	out[1] = (((edid->mfg_id[0] & 0x03) << 3) |
+		 ((edid->mfg_id[1] & 0xE0) >> 5)) + '@';
+	out[2] = (edid->mfg_id[1] & 0x1F) + '@';
+}
+
 static void edid_set_mfg(struct edid *edid, const char mfg[static 3])
 {
 	edid->mfg_id[0] = (mfg[0] - '@') << 2 | (mfg[1] - '@') >> 3;
diff --git a/lib/igt_edid.h b/lib/igt_edid.h
index 8d8e30ec0554..47581bb778b0 100644
--- a/lib/igt_edid.h
+++ b/lib/igt_edid.h
@@ -298,6 +298,7 @@ void edid_init(struct edid *edid);
 void edid_init_with_mode(struct edid *edid, drmModeModeInfo *mode);
 void edid_update_checksum(struct edid *edid);
 size_t edid_get_size(const struct edid *edid);
+void edid_get_mfg(const struct edid *edid, char out[static 3]);
 void detailed_timing_set_mode(struct detailed_timing *dt, drmModeModeInfo *mode,
 			      int width_mm, int height_mm);
 void detailed_timing_set_monitor_range_mode(struct detailed_timing *dt,
diff --git a/tests/kms_chamelium.c b/tests/kms_chamelium.c
index 175e5032c973..1d5c0ded8a56 100644
--- a/tests/kms_chamelium.c
+++ b/tests/kms_chamelium.c
@@ -184,7 +184,7 @@ check_analog_bridge(data_t *data, struct chamelium_port *port)
 	drmModeConnector *connector = chamelium_port_get_connector(
 	    data->chamelium, port, false);
 	uint64_t edid_blob_id;
-	unsigned char *edid;
+	const struct edid *edid;
 	char edid_vendor[3];
 
 	if (chamelium_port_get_type(port) != DRM_MODE_CONNECTOR_VGA) {
@@ -198,12 +198,8 @@ check_analog_bridge(data_t *data, struct chamelium_port *port)
 	igt_assert(edid_blob = drmModeGetPropertyBlob(data->drm_fd,
 						      edid_blob_id));
 
-	edid = (unsigned char *) edid_blob->data;
-
-	edid_vendor[0] = ((edid[8] & 0x7c) >> 2) + '@';
-	edid_vendor[1] = (((edid[8] & 0x03) << 3) |
-			  ((edid[9] & 0xe0) >> 5)) + '@';
-	edid_vendor[2] = (edid[9] & 0x1f) + '@';
+	edid = (const struct edid *) edid_blob->data;
+	edid_get_mfg(edid, edid_vendor);
 
 	drmModeFreePropertyBlob(edid_blob);
 	drmModeFreeConnector(connector);
-- 
2.22.0

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