Protocol message structures and constants of the HDCP2.2 specification are defined at <drm/drm_hdcp.h>
Signed-off-by: Ramalingam C ramalingam.c@intel.com --- include/drm/drm_hdcp.h | 204 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 204 insertions(+)
diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index d5adbf5..1f9a04d 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -166,6 +166,210 @@ struct drm_hdcp { #define DRM_HDCP_STATUS_SHIFT 20 #define DRM_HDCP_STATUS_MASK (0xFULL<<DRM_HDCP_STATUS_SHIFT)
+ +/** + * Protocol message definition for HDCP2.2 specification + */ + +/* HDCP2.2 Msg IDs */ +#define NULL_MSG 1 +#define AKE_INIT 2 +#define AKE_SEND_CERT 3 +#define AKE_NO_STORED_KM 4 +#define AKE_STORED_KM 5 +#define AKE_SEND_HPRIME 7 +#define AKE_SEND_PARING_INFO 8 +#define LC_INIT 9 +#define LC_SEND_LPRIME 10 +#define SKE_SEND_EKS 11 +#define REP_SEND_RECVID_LIST 12 +#define REP_SEND_ACK 15 +#define REP_STREAM_MANAGE 16 +#define REP_STREAM_READY 17 + +#define HDCP_RTX_LEN 8 +#define HDCP_RRX_LEN 8 +#define RECEIVER_ID_SIZE 5 + +#define K_PUB_RX_MOD_N_SIZE 128 +#define K_PUB_RX_EXP_E_SIZE 3 +#define K_PUB_RX_SIZE (K_PUB_RX_MOD_N_SIZE + \ + K_PUB_RX_EXP_E_SIZE) + +#define DCP_LLC_SIGNATURE_SIZE 384 + +#define HDCP_E_KPUB_KM_LEN 128 +#define HDCP_E_KH_KM_M_LEN (16 + 16) +#define HDCP_H_PRIME_LEN 32 +#define HDCP_E_KH_KM_LEN 16 +#define HDCP_RN_LEN 8 +#define HDCP_L_PRIME_LEN 32 +#define HDCP_E_DKEY_KS_LEN 16 +#define HDCP_RIV_LEN 8 +#define HDCP_SEQ_NUM_LEN 3 +#define HDCP_LPRIME_HALF_SIZE (HDCP_L_PRIME_LEN / 2) +#define HDCP_RECEIVER_ID_LEN 5 +#define HDCP_MAX_DEVICE_COUNT 31 +#define HDCP_RECEIVER_IDS_MAX_LEN (HDCP_RECEIVER_ID_LEN * \ + HDCP_MAX_DEVICE_COUNT) + +/** + * 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 MAX_CONTENT_STREAMS_CNT 1 + +#define HDCP_MPRIME_LEN 32 + +struct hdcp_cert_rx { + uint8_t receiver_id[RECEIVER_ID_SIZE]; + uint8_t kpub_rx[K_PUB_RX_SIZE]; + uint8_t reserved1 :4; + + /* As per HDMI & DP HDCP Spec, must be 0x0 or 0x1 */ + uint8_t protocol_descriptor :4; + + /* As per HDMI & DP HDCP Spec, must be 0x0000 */ + uint8_t reserved2; + uint8_t dcp_signature[DCP_LLC_SIGNATURE_SIZE]; +} __packed; + +/** + * The RxCaps field specified in the HDCP HDMI, DP specs + * This field is big endian as specified in the errata. + */ +union rx_caps { + struct { + uint8_t version; + uint8_t receiver_capability_mask_hi; + uint8_t repeater:1; + + /* Rsvd in HDMI. Applicable in DP alone */ + uint8_t hdcp_capable:1; + uint8_t receiver_capability_mask_low:6; + } fields; + uint8_t rx_caps_value[3]; +} __packed; + +/** + * RxInfo fields Contains various topology information for the + * repeater authentication flows + */ +union rx_info { + struct { + uint8_t device_count_hi:1; + uint8_t depth:3; + uint8_t rsvd:4; + + /* Bit-0: downstream HDCP 1.x device exist */ + uint8_t hdcp1_device_downstream:1; + + /* Bit-1: downstream HDCP 2.0, 2.1 device exist */ + uint8_t hdcp2_legacy_device_downstream:1; + + /* Bit-2: downstream Topology limit errors */ + uint8_t max_cascade_exceeded:1; + uint8_t max_devs_exceeded:1; + uint8_t device_count_lo:4; + + } fields; + uint16_t rx_info_value; +} __packed; + +struct wired_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 tx_caps { + uint8_t version; + + /* Reserved for HDCP and DP Spec. Read as Zero */ + uint16_t transmitter_capability_mask; +} __packed; + +/* + * Main structures for HDCP2.2 protocol communication + */ +struct wired_ake_init { + uint8_t msg_id; + uint8_t r_tx[HDCP_RTX_LEN]; + struct tx_caps tx_caps; +} __packed; + +struct wired_ake_send_cert { + uint8_t msg_id; + struct hdcp_cert_rx cert_rx; + uint8_t r_rx[HDCP_RRX_LEN]; + union rx_caps rx_caps; +} __packed; + +struct wired_ake_no_stored_km { + uint8_t msg_id; + uint8_t e_kpub_km[HDCP_E_KPUB_KM_LEN]; +} __packed; + +struct wired_ake_stored_km { + uint8_t msg_id; + uint8_t e_kh_km_m[HDCP_E_KH_KM_M_LEN]; +} __packed; + +struct wired_ake_send_hprime { + uint8_t msg_id; + uint8_t h_prime[HDCP_H_PRIME_LEN]; +} __packed; + +struct wired_ake_send_pairing_info { + uint8_t msg_id; + uint8_t e_kh_km[HDCP_E_KH_KM_LEN]; +} __packed; + +struct wired_lc_init { + uint8_t msg_id; + uint8_t r_n[HDCP_RN_LEN]; +} __packed; + +struct wired_lc_send_lprime { + uint8_t msg_id; + uint8_t l_prime[HDCP_L_PRIME_LEN]; +} __packed; + +struct wired_ske_send_eks { + uint8_t msg_id; + uint8_t e_dkey_ks[HDCP_E_DKEY_KS_LEN]; + uint8_t riv[HDCP_RIV_LEN]; +} __packed; + +struct wired_rep_send_receiverid_list { + uint8_t msg_id; + union rx_info rx_info; + uint8_t seq_num_v[HDCP_SEQ_NUM_LEN]; + uint8_t v_prime[HDCP_LPRIME_HALF_SIZE]; + uint8_t receiver_ids[HDCP_RECEIVER_IDS_MAX_LEN]; +} __packed; + +struct wired_rep_send_ack { + uint8_t msg_id; + uint8_t v[HDCP_LPRIME_HALF_SIZE]; +} __packed; + +struct wired_rep_stream_manage { + uint8_t msg_id; + uint8_t seq_num_m[HDCP_SEQ_NUM_LEN]; + uint16_t k; + struct wired_streamid_type streams[MAX_CONTENT_STREAMS_CNT]; +} __packed; + +struct wired_rep_stream_ready { + uint8_t msg_id; + uint8_t m_prime[HDCP_MPRIME_LEN]; +} __packed; + /* Functions exported */ extern int drm_hdcp_init(struct drm_connector *connector, struct drm_hdcp *hdcp,