1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c
new file mode 100644
index 000000000..1ccfc8314
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/hdmi.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: MIT
+#include "hdmi.h"
+
+void pack_hdmi_infoframe(struct packed_hdmi_infoframe *packed_frame,
+			 u8 *raw_frame, ssize_t len)
+{
+	u32 header = 0;
+	u32 subpack0_low = 0;
+	u32 subpack0_high = 0;
+	u32 subpack1_low = 0;
+	u32 subpack1_high = 0;
+
+	switch (len) {
+		/*
+		 * "When in doubt, use brute force."
+		 *     -- Ken Thompson.
+		 */
+	default:
+		/*
+		 * We presume that no valid frame is longer than 17
+		 * octets, including header...  And truncate to that
+		 * if it's longer.
+		 */
+	case 17:
+		subpack1_high = (raw_frame[16] << 16);
+		fallthrough;
+	case 16:
+		subpack1_high |= (raw_frame[15] << 8);
+		fallthrough;
+	case 15:
+		subpack1_high |= raw_frame[14];
+		fallthrough;
+	case 14:
+		subpack1_low = (raw_frame[13] << 24);
+		fallthrough;
+	case 13:
+		subpack1_low |= (raw_frame[12] << 16);
+		fallthrough;
+	case 12:
+		subpack1_low |= (raw_frame[11] << 8);
+		fallthrough;
+	case 11:
+		subpack1_low |= raw_frame[10];
+		fallthrough;
+	case 10:
+		subpack0_high = (raw_frame[9] << 16);
+		fallthrough;
+	case 9:
+		subpack0_high |= (raw_frame[8] << 8);
+		fallthrough;
+	case 8:
+		subpack0_high |= raw_frame[7];
+		fallthrough;
+	case 7:
+		subpack0_low = (raw_frame[6] << 24);
+		fallthrough;
+	case 6:
+		subpack0_low |= (raw_frame[5] << 16);
+		fallthrough;
+	case 5:
+		subpack0_low |= (raw_frame[4] << 8);
+		fallthrough;
+	case 4:
+		subpack0_low |= raw_frame[3];
+		fallthrough;
+	case 3:
+		header = (raw_frame[2] << 16);
+		fallthrough;
+	case 2:
+		header |= (raw_frame[1] << 8);
+		fallthrough;
+	case 1:
+		header |= raw_frame[0];
+		fallthrough;
+	case 0:
+		break;
+	}
+
+	packed_frame->header = header;
+	packed_frame->subpack0_low = subpack0_low;
+	packed_frame->subpack0_high = subpack0_high;
+	packed_frame->subpack1_low = subpack1_low;
+	packed_frame->subpack1_high = subpack1_high;
+}