> 
> This patch defines the hdcp2.2 protocol messages for the
> HDCP2.2 authentication.
> 
> Signed-off-by: Ramalingam C <ramalinga...@intel.com>
> ---
>  include/drm/drm_hdcp.h | 226
> +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 226 insertions(+)
> 
> diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index
> 562fa7df2637..9661c700cebb 100644
> --- a/include/drm/drm_hdcp.h
> +++ b/include/drm/drm_hdcp.h
> @@ -38,4 +38,230 @@
>  #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
> +
> +struct cp_srm_header {
> +     struct {
> +             uint8_t reserved_hi:4;
> +             uint8_t srm_id:4;
> +             uint8_t reserved_lo;
> +     } spec_indicator;
Do you really want to work with bit fields?  I mean in all the all structures.
> +     uint16_t srm_version;
Shouldn't be it __le16? 
> +     uint8_t srm_gen_no;
> +} __packed;

> +
> +/**
> + * Protocol message definition for HDCP2.2 specification  */
> +
> +#define HDCP_STREAM_TYPE0                    0x00
> +#define HDCP_STREAM_TYPE1                    0x01
> +
> +/* HDCP2.2 Msg IDs */
> +#define NULL_MSG                             1


We need some HDCP2_ prefix this is in kernel global space and 
some of the constants have very generic name that can collide.

> +#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 ERRATA_DP_STREAM_TYPE                        50
> +
> +#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 hdcp2_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 hdcp2_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 hdcp2_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;
Should be probably __le16 and better to use bitmask then bit fields. 

> +} __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 {
> +     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
> +hdcp2_ake_init {
> +     uint8_t                 msg_id;
> +     uint8_t                 r_tx[HDCP_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_RRX_LEN];
> +     union hdcp2_rx_caps     rx_caps;
> +} __packed;
> +
> +struct hdcp2_ake_no_stored_km {
> +     uint8_t                 msg_id;
> +     uint8_t                 e_kpub_km[HDCP_E_KPUB_KM_LEN];
> +} __packed;
> +
> +struct hdcp2_ake_stored_km {
> +     uint8_t                 msg_id;
> +     uint8_t                 e_kh_km_m[HDCP_E_KH_KM_M_LEN];
> +} __packed;
> +
> +struct hdcp2_ake_send_hprime {
> +     uint8_t                 msg_id;
> +     uint8_t                 h_prime[HDCP_H_PRIME_LEN];
> +} __packed;
> +
> +struct hdcp2_ake_send_pairing_info {
> +     uint8_t                 msg_id;
> +     uint8_t                 e_kh_km[HDCP_E_KH_KM_LEN];
> +} __packed;
> +
> +struct hdcp2_lc_init {
> +     uint8_t                 msg_id;
> +     uint8_t                 r_n[HDCP_RN_LEN];
> +} __packed;
> +
> +struct hdcp2_lc_send_lprime {
> +     uint8_t                 msg_id;
> +     uint8_t                 l_prime[HDCP_L_PRIME_LEN];
> +} __packed;
> +
> +struct hdcp2_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 hdcp2_rep_send_receiverid_list {
> +     uint8_t                 msg_id;
> +     union hdcp2_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 hdcp2_rep_send_ack {
> +     uint8_t                 msg_id;
> +     uint8_t                 v[HDCP_LPRIME_HALF_SIZE];
> +} __packed;
> +
> +struct hdcp2_rep_stream_manage {
> +     uint8_t                 msg_id;
> +     uint8_t                 seq_num_m[HDCP_SEQ_NUM_LEN];
> +     uint16_t                k;
> +     struct hdcp2_streamid_type
> streams[MAX_CONTENT_STREAMS_CNT]; }
> +__packed;
> +
> +struct hdcp2_rep_stream_ready {
> +     uint8_t                 msg_id;
> +     uint8_t                 m_prime[HDCP_MPRIME_LEN];
> +} __packed;
> +
> +struct hdcp2_dp_errata_stream_type {
> +     uint8_t         msg_id;
> +     uint8_t         stream_type;
> +} __packed;
> +
>  #endif
> --
> 2.7.4

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