edid-decode: add support for DisplayID Adaptive Sync DBHEADmaster

Support this new DisplayID v2 data block.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

2 files changed, 45 insertions, 0 deletions

diff --git a/edid-decode.h b/edid-decode.h
index 612d22a..aef2bab 100644
--- a/edid-decode.h
+++ b/edid-decode.h
@@ -387,6 +387,7 @@ struct edid_state {
 	void parse_displayid_type_9_timing(const unsigned char *x);
 	void parse_displayid_dynamic_video_timings_range_limits(const unsigned char *x);
 	void parse_displayid_ContainerID(const unsigned char *x);
+	void parse_displayid_adaptive_sync(const unsigned char *x);
 	void parse_displayid_type_10_timing(const unsigned char *x, unsigned sz,
 					    bool is_cta = false);
 	void preparse_displayid_block(const unsigned char *x);
diff --git a/parse-displayid-block.cpp b/parse-displayid-block.cpp
index 5c81294..e4c3bff 100644
--- a/parse-displayid-block.cpp
+++ b/parse-displayid-block.cpp
@@ -1368,6 +1368,48 @@ void edid_state::parse_displayid_ContainerID(const unsigned char *x)
 	}
 }
 
+// tag 0x2b
+
+void edid_state::parse_displayid_adaptive_sync(const unsigned char *x)
+{
+	check_displayid_datablock_revision(x[1], 0x70);
+
+	unsigned size = 6 + ((x[1] >> 4) & 0x7);
+	unsigned len = x[2];
+	unsigned descriptor = 1;
+
+	x += 3;
+	if (len % size)
+		fail("DisplayID payload length %u is not a multiple of %u.\n", len, size);
+	while (len >= size) {
+		printf("    Descriptor #%u:\n", descriptor++);
+
+		printf("      %sNative Panel Range\n", (x[0] & 1) ? "" : "Non-");
+		unsigned v = (x[0] >> 2) & 3;
+		switch (v) {
+		case 0: printf("      Fixed Average V-Total\n"); break;
+		case 1: printf("      Fixed Average V-Total and Adaptive V-Total\n"); break;
+		default:
+			printf("      Reserved %u\n", v);
+			fail("Use of reserved value %u.\n", v);
+			break;
+		}
+		if (x[0] & 0x10)
+			printf("      Supports Seamless Transition\n");
+		if (x[0] & 0x02)
+			printf("      'Max Single Frame Duration Increase' field value without jitter impact\n");
+		if (x[0] & 0x20)
+			printf("      'Max Single Frame Duration Decrease' field value without jitter impact\n");
+		printf("      Max Duration Increase: %.2f ms\n", x[1] / 4.0);
+		printf("      Max Duration Decrease: %.2f ms\n", x[5] / 4.0);
+		printf("      Min Refresh Rate: %u Hz\n", x[2]);
+		printf("      Max Refresh Rate: %u Hz\n", 1 + x[3] + (x[4] & 3) * 256);
+
+		len -= size;
+		x += size;
+	}
+}
+
 // tag 0x32
 
 void edid_state::parse_displayid_type_10_timing(const unsigned char *x,
@@ -1687,6 +1729,7 @@ void edid_state::parse_displayid_block(const unsigned char *x)
 		case 0x27: data_block = "Stereo Display Interface Data Block (" + utohex(tag) + ")"; break;
 		case 0x28: data_block = "Tiled Display Topology Data Block (" + utohex(tag) + ")"; break;
 		case 0x29: data_block = "ContainerID Data Block"; break;
+		case 0x2b: data_block = "Adaptive Sync Data Block"; break;
 		case 0x32: data_block = "Video Timing Modes Type 10 - Formula-based Timings Data Block"; break;
 		// 0x2a .. 0x7d RESERVED for Additional VESA-defined Data Blocks
 		case 0x7e: // DisplayID 2.0
@@ -1862,6 +1905,7 @@ void edid_state::parse_displayid_block(const unsigned char *x)
 		case 0x27: parse_displayid_stereo_display_intf(x + offset); break;
 		case 0x28: parse_displayid_tiled_display_topology(x + offset, true); break;
 		case 0x29: parse_displayid_ContainerID(x + offset); break;
+		case 0x2b: parse_displayid_adaptive_sync(x + offset); break;
 		case 0x32: {
 			   unsigned sz = 6 + ((x[offset + 1] & 0x70) >> 4);