diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h
index 562fa7df2637..5e0a5ed1a08e 100644
--- a/include/drm/drm_hdcp.h
+++ b/include/drm/drm_hdcp.h
@@ -38,4 +38,187 @@
 #define DRM_HDCP_DDC_BSTATUS			0x41
 #define DRM_HDCP_DDC_KSV_FIFO			0x43
 
+#define DRM_HDCP_1_4_SRM_ID			0x8
+#define DRM_HDCP_1_4_VRL_LENGTH_SIZE		3
+#define DRM_HDCP_1_4_DCP_SIG_SIZE		40
+
+/**
+ * Protocol message definition for HDCP2.2 specification
+ */
+
+#define HDCP_STREAM_TYPE0			0x00
+#define HDCP_STREAM_TYPE1			0x01
+
+/* HDCP2.2 Msg IDs */
+#define HDCP_2_2_NULL_MSG			1
+#define HDCP_2_2_AKE_INIT			2
+#define HDCP_2_2_AKE_SEND_CERT			3
+#define HDCP_2_2_AKE_NO_STORED_KM		4
+#define HDCP_2_2_AKE_STORED_KM			5
+#define HDCP_2_2_AKE_SEND_HPRIME		7
+#define HDCP_2_2_AKE_SEND_PARING_INFO		8
+#define HDCP_2_2_LC_INIT			9
+#define HDCP_2_2_LC_SEND_LPRIME			10
+#define HDCP_2_2_SKE_SEND_EKS			11
+#define HDCP_2_2_REP_SEND_RECVID_LIST		12
+#define HDCP_2_2_REP_SEND_ACK			15
+#define HDCP_2_2_REP_STREAM_MANAGE		16
+#define HDCP_2_2_REP_STREAM_READY		17
+#define HDCP_2_2_ERRATA_DP_STREAM_TYPE		50
+
+#define HDCP_2_2_RTX_LEN			8
+#define HDCP_2_2_RRX_LEN			8
+
+#define HDCP_2_2_K_PUB_RX_MOD_N_LEN		128
+#define HDCP_2_2_K_PUB_RX_EXP_E_LEN		3
+#define HDCP_2_2_K_PUB_RX_LEN			(HDCP_2_2_K_PUB_RX_MOD_N_LEN + \
+						 HDCP_2_2_K_PUB_RX_EXP_E_LEN)
+
+#define HDCP_2_2_DCP_LLC_SIG_LEN		384
+
+#define HDCP_2_2_E_KPUB_KM_LEN			128
+#define HDCP_2_2_E_KH_KM_M_LEN			(16 + 16)
+#define HDCP_2_2_H_PRIME_LEN			32
+#define HDCP_2_2_E_KH_KM_LEN			16
+#define HDCP_2_2_RN_LEN				8
+#define HDCP_2_2_L_PRIME_LEN			32
+#define HDCP_2_2_E_DKEY_KS_LEN			16
+#define HDCP_2_2_RIV_LEN			8
+#define HDCP_2_2_SEQ_NUM_LEN			3
+#define HDCP_2_2_LPRIME_HALF_LEN		(HDCP_2_2_L_PRIME_LEN / 2)
+#define HDCP_2_2_RECEIVER_ID_LEN		DRM_HDCP_KSV_LEN
+#define HDCP_2_2_MAX_DEVICE_COUNT		31
+#define HDCP_2_2_RECEIVER_IDS_MAX_LEN		(HDCP_2_2_RECEIVER_ID_LEN * \
+						 HDCP_2_2_MAX_DEVICE_COUNT)
+#define HDCP_2_2_MPRIME_LEN			32
+
+/**
+ * TODO: This has to be changed for DP MST, as multiple stream on
+ * same port is possible.
+ * For HDCP2.2 on HDMI and DP SST this value is always 1.
+ */
+#define HDCP_2_2_MAX_CONTENT_STREAMS_CNT	1
+#define HDCP_2_2_TXCAP_MASK_LEN			2
+#define HDCP_2_2_RXCAPS_LEN			3
+#define HDCP_2_2_RX_REPEATER(x)			(x & BIT(0))
+#define HDCP_2_2_DP_HDCP_CAPABLE(x)		(x & BIT(1))
+#define HDCP_2_2_RXINFO_LEN			2
+
+/* HDCP1.x compliant device in downstream */
+#define HDCP_2_2_HDCP1_DEVICE_CONNECTED(x)	(x & BIT(0))
+
+/* HDCP2.0 Compliant repeater in downstream */
+#define HDCP_2_2_HDCP_2_0_REP_CONNECTED(x)	(x & BIT(1))
+#define HDCP_2_2_MAX_CASCADE_EXCEEDED(x)	(x & BIT(2))
+#define HDCP_2_2_MAX_DEVS_EXCEEDED(x)		(x & BIT(3))
+#define HDCP_2_2_DEV_COUNT_LO(x)		((x & (0xF << 4)) >> 4)
+#define HDCP_2_2_DEV_COUNT_HI(x)		(x & BIT(0))
+#define HDCP_2_2_DEPTH(x)			((x & (0x7 << 1)) >> 1)
+
+struct hdcp2_cert_rx {
+	uint8_t	receiver_id[HDCP_2_2_RECEIVER_ID_LEN];
+	uint8_t	kpub_rx[HDCP_2_2_K_PUB_RX_LEN];
+	uint8_t	reserved[2];
+	uint8_t	dcp_signature[HDCP_2_2_DCP_LLC_SIG_LEN];
+} __packed;
+
+struct hdcp2_streamid_type {
+	uint8_t stream_id;
+	uint8_t stream_type;
+} __packed;
+
+/**
+ * The TxCaps field specified in the HDCP HDMI, DP specs
+ * This field is big endian as specified in the errata.
+ */
+struct hdcp2_tx_caps {
+	/* Transmitter must set this to 0x2 */
+	uint8_t			version;
+
+	/* Reserved for HDCP and DP Spec. Read as Zero */
+	uint8_t			tx_cap_mask[HDCP_2_2_TXCAP_MASK_LEN];
+} __packed;
+
+/*
+ * Main structures for HDCP2.2 protocol communication
+ */
+struct hdcp2_ake_init {
+	uint8_t			msg_id;
+	uint8_t			r_tx[HDCP_2_2_RTX_LEN];
+	struct hdcp2_tx_caps	tx_caps;
+} __packed;
+
+struct hdcp2_ake_send_cert {
+	uint8_t			msg_id;
+	struct hdcp2_cert_rx	cert_rx;
+	uint8_t			r_rx[HDCP_2_2_RRX_LEN];
+	uint8_t			rx_caps[HDCP_2_2_RXCAPS_LEN];
+} __packed;
+
+struct hdcp2_ake_no_stored_km {
+	uint8_t			msg_id;
+	uint8_t			e_kpub_km[HDCP_2_2_E_KPUB_KM_LEN];
+} __packed;
+
+struct hdcp2_ake_stored_km {
+	uint8_t			msg_id;
+	uint8_t			e_kh_km_m[HDCP_2_2_E_KH_KM_M_LEN];
+} __packed;
+
+struct hdcp2_ake_send_hprime {
+	uint8_t			msg_id;
+	uint8_t			h_prime[HDCP_2_2_H_PRIME_LEN];
+} __packed;
+
+struct hdcp2_ake_send_pairing_info {
+	uint8_t			msg_id;
+	uint8_t			e_kh_km[HDCP_2_2_E_KH_KM_LEN];
+} __packed;
+
+struct hdcp2_lc_init {
+	uint8_t			msg_id;
+	uint8_t			r_n[HDCP_2_2_RN_LEN];
+} __packed;
+
+struct hdcp2_lc_send_lprime {
+	uint8_t			msg_id;
+	uint8_t			l_prime[HDCP_2_2_L_PRIME_LEN];
+} __packed;
+
+struct hdcp2_ske_send_eks {
+	uint8_t			msg_id;
+	uint8_t			e_dkey_ks[HDCP_2_2_E_DKEY_KS_LEN];
+	uint8_t			riv[HDCP_2_2_RIV_LEN];
+} __packed;
+
+struct hdcp2_rep_send_receiverid_list {
+	uint8_t			msg_id;
+	uint8_t			rx_info[HDCP_2_2_RXINFO_LEN];
+	uint8_t			seq_num_v[HDCP_2_2_SEQ_NUM_LEN];
+	uint8_t			v_prime[HDCP_2_2_LPRIME_HALF_LEN];
+	uint8_t			receiver_ids[HDCP_2_2_RECEIVER_IDS_MAX_LEN];
+} __packed;
+
+struct hdcp2_rep_send_ack {
+	uint8_t			msg_id;
+	uint8_t			v[HDCP_2_2_LPRIME_HALF_LEN];
+} __packed;
+
+struct hdcp2_rep_stream_manage {
+	uint8_t			msg_id;
+	uint8_t			seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
+	__be16			k;
+	struct hdcp2_streamid_type streams[HDCP_2_2_MAX_CONTENT_STREAMS_CNT];
+} __packed;
+
+struct hdcp2_rep_stream_ready {
+	uint8_t			msg_id;
+	uint8_t			m_prime[HDCP_2_2_MPRIME_LEN];
+} __packed;
+
+struct hdcp2_dp_errata_stream_type {
+	uint8_t			msg_id;
+	uint8_t			stream_type;
+} __packed;
+
 #endif
