Message ID | 1543315413-24302-9-git-send-email-ramalingam.c@intel.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
Series | drm/i915: Implement HDCP2.2 | expand |
On Tue, Nov 27, 2018 at 04:13:06PM +0530, Ramalingam C wrote: > Implements the HDCP2.2 repeaters authentication steps such as verifying > the downstream topology and sending stream management information. > > v2: > Rebased. > v3: > No Changes. > v4: > -EINVAL is returned for topology error and rollover scenario. > Endianness conversion func from drm_hdcp.h is used [Uma] > v5: > Rebased as part of patches reordering. > Defined the mei service functions [Daniel] > v6: > Redefined the mei service functions as per comp redesign. > v7: > %s/uintxx_t/uxx > Check for comp_master is removed. > v8: > Adjust to the new mei interface. > style issue fixed. > > Signed-off-by: Ramalingam C <ramalingam.c@intel.com> > --- > drivers/gpu/drm/i915/intel_hdcp.c | 125 +++++++++++++++++++++++++++++++++++++- > include/drm/drm_hdcp.h | 15 +++++ > 2 files changed, 138 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c > index 0d7fea9c9bb1..679f3c164582 100644 > --- a/drivers/gpu/drm/i915/intel_hdcp.c > +++ b/drivers/gpu/drm/i915/intel_hdcp.c > @@ -1069,7 +1069,7 @@ static int hdcp2_prepare_skey(struct intel_connector *connector, > return ret; > } > > -static __attribute__((unused)) int > +static int > hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, > struct hdcp2_rep_send_receiverid_list > *rep_topology, > @@ -1099,7 +1099,7 @@ hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, > return ret; > } > > -static __attribute__((unused)) int > +static int > hdcp2_verify_mprime(struct intel_connector *connector, > struct hdcp2_rep_stream_ready *stream_ready) > { > @@ -1315,6 +1315,121 @@ static int hdcp2_session_key_exchange(struct intel_connector *connector) > return 0; > } > > +static > +int hdcp2_propagate_stream_management_info(struct intel_connector *connector) > +{ > + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); > + struct intel_hdcp *hdcp = &connector->hdcp; > + union { > + struct hdcp2_rep_stream_manage stream_manage; > + struct hdcp2_rep_stream_ready stream_ready; > + } msgs; > + const struct intel_hdcp_shim *shim = hdcp->shim; > + int ret; > + > + /* Prepare RepeaterAuth_Stream_Manage msg */ > + msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE; > + reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN, > + (u8 *)&hdcp->seq_num_m); > + > + /* K no of streams is fixed as 1. Stored as big-endian. */ > + msgs.stream_manage.k = __swab16(1); > + > + /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ > + msgs.stream_manage.streams[0].stream_id = 0; > + msgs.stream_manage.streams[0].stream_type = hdcp->content_type; > + > + /* Send it to Repeater */ > + ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage, > + sizeof(msgs.stream_manage)); > + if (ret < 0) > + return ret; > + > + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY, > + &msgs.stream_ready, sizeof(msgs.stream_ready)); > + if (ret < 0) > + return ret; > + > + hdcp->mei_data.seq_num_m = hdcp->seq_num_m; > + hdcp->mei_data.streams[0].stream_type = hdcp->content_type; > + > + ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); > + if (ret < 0) > + return ret; > + > + hdcp->seq_num_m++; > + > + if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) { > + DRM_DEBUG_KMS("seq_num_m roll over.\n"); > + return -1; > + } > + > + return 0; > +} > + > +static > +int hdcp2_authenticate_repeater_topology(struct intel_connector *connector) > +{ > + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); > + struct intel_hdcp *hdcp = &connector->hdcp; > + union { > + struct hdcp2_rep_send_receiverid_list recvid_list; > + struct hdcp2_rep_send_ack rep_ack; > + } msgs; > + const struct intel_hdcp_shim *shim = hdcp->shim; > + u8 *rx_info; > + u32 seq_num_v; > + int ret; > + > + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_SEND_RECVID_LIST, > + &msgs.recvid_list, sizeof(msgs.recvid_list)); > + if (ret < 0) > + return ret; > + > + rx_info = msgs.recvid_list.rx_info; > + > + if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rx_info[1]) || > + HDCP_2_2_MAX_DEVS_EXCEEDED(rx_info[1])) { > + DRM_DEBUG_KMS("Topology Max Size Exceeded\n"); > + return -EINVAL; > + } > + > + /* Converting and Storing the seq_num_v to local variable as DWORD */ > + reverse_endianness((u8 *)&seq_num_v, HDCP_2_2_SEQ_NUM_LEN, > + msgs.recvid_list.seq_num_v); > + > + if (seq_num_v < hdcp->seq_num_v) { > + /* Roll over of the seq_num_v from repeater. Reauthenticate. */ > + DRM_DEBUG_KMS("Seq_num_v roll over.\n"); > + return -EINVAL; > + } > + > + ret = hdcp2_verify_rep_topology_prepare_ack(connector, > + &msgs.recvid_list, > + &msgs.rep_ack); > + if (ret < 0) > + return ret; > + > + hdcp->seq_num_v = seq_num_v; > + ret = shim->write_2_2_msg(intel_dig_port, &msgs.rep_ack, > + sizeof(msgs.rep_ack)); > + if (ret < 0) > + return ret; > + > + return 0; > +} > + > +static int hdcp2_authenticate_repeater(struct intel_connector *connector) > +{ > + int ret; > + > + ret = hdcp2_authenticate_repeater_topology(connector); > + if (ret < 0) > + return ret; > + > + return hdcp2_propagate_stream_management_info(connector); > +} > + > static int hdcp2_authenticate_sink(struct intel_connector *connector) > { > struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); > @@ -1356,6 +1471,12 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector) > sizeof(stream_type_msg)); > if (ret < 0) > return ret; > + } else if (hdcp->is_repeater) { > + ret = hdcp2_authenticate_repeater(connector); > + if (ret < 0) { > + DRM_DEBUG_KMS("Repeater Auth Failed. Err: %d\n", ret); > + return ret; > + } > } > > hdcp->mei_data.streams[0].stream_type = hdcp->content_type; > diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h > index a6de09c5e47f..3e45a7618ab3 100644 > --- a/include/drm/drm_hdcp.h > +++ b/include/drm/drm_hdcp.h > @@ -250,4 +250,19 @@ struct hdcp2_dp_errata_stream_type { > #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) > #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) > > +/* > + * Library functions for endianness are aligned for 16/32/64 bits. > + * But hdcp sequence numbers are 24bits. So for their Byte swapping, > + * a conversion function is developed. > + */ > +static inline void reverse_endianness(u8 *dest, size_t sz, u8 *src) This feels a bit fake-generic and doesn't fit that well into what you want it to do in the code actually. What about: u32 drm_hdcp2_seq_num_to_u32(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN]) { return seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16; } (I didn't check the math). I think this would both make the code more clearer and avoid the problem of "shouldn't we make sure this works for everything and put it into linux/string.h?" Again I'll check the actual hdcp2 flow later on. In general I'm kinda not happy with the shim midlayer design, but I wasn't happy with that with hdcp1 either, and hdcp2 is just an extension, and I don't really have a better idea either so seems all good to me. -Daniel > +{ > + u32 index; > + > + if (!sz || sz > sizeof(u32)) > + return; > + for (index = 0; index < sz; index++) > + dest[sz - index - 1] = src[index]; > +} > + > #endif > -- > 2.7.4 >
On 12/6/2018 4:15 PM, Daniel Vetter wrote: > On Tue, Nov 27, 2018 at 04:13:06PM +0530, Ramalingam C wrote: >> Implements the HDCP2.2 repeaters authentication steps such as verifying >> the downstream topology and sending stream management information. >> >> v2: >> Rebased. >> v3: >> No Changes. >> v4: >> -EINVAL is returned for topology error and rollover scenario. >> Endianness conversion func from drm_hdcp.h is used [Uma] >> v5: >> Rebased as part of patches reordering. >> Defined the mei service functions [Daniel] >> v6: >> Redefined the mei service functions as per comp redesign. >> v7: >> %s/uintxx_t/uxx >> Check for comp_master is removed. >> v8: >> Adjust to the new mei interface. >> style issue fixed. >> >> Signed-off-by: Ramalingam C <ramalingam.c@intel.com> >> --- >> drivers/gpu/drm/i915/intel_hdcp.c | 125 +++++++++++++++++++++++++++++++++++++- >> include/drm/drm_hdcp.h | 15 +++++ >> 2 files changed, 138 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c >> index 0d7fea9c9bb1..679f3c164582 100644 >> --- a/drivers/gpu/drm/i915/intel_hdcp.c >> +++ b/drivers/gpu/drm/i915/intel_hdcp.c >> @@ -1069,7 +1069,7 @@ static int hdcp2_prepare_skey(struct intel_connector *connector, >> return ret; >> } >> >> -static __attribute__((unused)) int >> +static int >> hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, >> struct hdcp2_rep_send_receiverid_list >> *rep_topology, >> @@ -1099,7 +1099,7 @@ hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, >> return ret; >> } >> >> -static __attribute__((unused)) int >> +static int >> hdcp2_verify_mprime(struct intel_connector *connector, >> struct hdcp2_rep_stream_ready *stream_ready) >> { >> @@ -1315,6 +1315,121 @@ static int hdcp2_session_key_exchange(struct intel_connector *connector) >> return 0; >> } >> >> +static >> +int hdcp2_propagate_stream_management_info(struct intel_connector *connector) >> +{ >> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); >> + struct intel_hdcp *hdcp = &connector->hdcp; >> + union { >> + struct hdcp2_rep_stream_manage stream_manage; >> + struct hdcp2_rep_stream_ready stream_ready; >> + } msgs; >> + const struct intel_hdcp_shim *shim = hdcp->shim; >> + int ret; >> + >> + /* Prepare RepeaterAuth_Stream_Manage msg */ >> + msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE; >> + reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN, >> + (u8 *)&hdcp->seq_num_m); >> + >> + /* K no of streams is fixed as 1. Stored as big-endian. */ >> + msgs.stream_manage.k = __swab16(1); >> + >> + /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ >> + msgs.stream_manage.streams[0].stream_id = 0; >> + msgs.stream_manage.streams[0].stream_type = hdcp->content_type; >> + >> + /* Send it to Repeater */ >> + ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage, >> + sizeof(msgs.stream_manage)); >> + if (ret < 0) >> + return ret; >> + >> + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY, >> + &msgs.stream_ready, sizeof(msgs.stream_ready)); >> + if (ret < 0) >> + return ret; >> + >> + hdcp->mei_data.seq_num_m = hdcp->seq_num_m; >> + hdcp->mei_data.streams[0].stream_type = hdcp->content_type; >> + >> + ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); >> + if (ret < 0) >> + return ret; >> + >> + hdcp->seq_num_m++; >> + >> + if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) { >> + DRM_DEBUG_KMS("seq_num_m roll over.\n"); >> + return -1; >> + } >> + >> + return 0; >> +} >> + >> +static >> +int hdcp2_authenticate_repeater_topology(struct intel_connector *connector) >> +{ >> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); >> + struct intel_hdcp *hdcp = &connector->hdcp; >> + union { >> + struct hdcp2_rep_send_receiverid_list recvid_list; >> + struct hdcp2_rep_send_ack rep_ack; >> + } msgs; >> + const struct intel_hdcp_shim *shim = hdcp->shim; >> + u8 *rx_info; >> + u32 seq_num_v; >> + int ret; >> + >> + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_SEND_RECVID_LIST, >> + &msgs.recvid_list, sizeof(msgs.recvid_list)); >> + if (ret < 0) >> + return ret; >> + >> + rx_info = msgs.recvid_list.rx_info; >> + >> + if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rx_info[1]) || >> + HDCP_2_2_MAX_DEVS_EXCEEDED(rx_info[1])) { >> + DRM_DEBUG_KMS("Topology Max Size Exceeded\n"); >> + return -EINVAL; >> + } >> + >> + /* Converting and Storing the seq_num_v to local variable as DWORD */ >> + reverse_endianness((u8 *)&seq_num_v, HDCP_2_2_SEQ_NUM_LEN, >> + msgs.recvid_list.seq_num_v); >> + >> + if (seq_num_v < hdcp->seq_num_v) { >> + /* Roll over of the seq_num_v from repeater. Reauthenticate. */ >> + DRM_DEBUG_KMS("Seq_num_v roll over.\n"); >> + return -EINVAL; >> + } >> + >> + ret = hdcp2_verify_rep_topology_prepare_ack(connector, >> + &msgs.recvid_list, >> + &msgs.rep_ack); >> + if (ret < 0) >> + return ret; >> + >> + hdcp->seq_num_v = seq_num_v; >> + ret = shim->write_2_2_msg(intel_dig_port, &msgs.rep_ack, >> + sizeof(msgs.rep_ack)); >> + if (ret < 0) >> + return ret; >> + >> + return 0; >> +} >> + >> +static int hdcp2_authenticate_repeater(struct intel_connector *connector) >> +{ >> + int ret; >> + >> + ret = hdcp2_authenticate_repeater_topology(connector); >> + if (ret < 0) >> + return ret; >> + >> + return hdcp2_propagate_stream_management_info(connector); >> +} >> + >> static int hdcp2_authenticate_sink(struct intel_connector *connector) >> { >> struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); >> @@ -1356,6 +1471,12 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector) >> sizeof(stream_type_msg)); >> if (ret < 0) >> return ret; >> + } else if (hdcp->is_repeater) { >> + ret = hdcp2_authenticate_repeater(connector); >> + if (ret < 0) { >> + DRM_DEBUG_KMS("Repeater Auth Failed. Err: %d\n", ret); >> + return ret; >> + } >> } >> >> hdcp->mei_data.streams[0].stream_type = hdcp->content_type; >> diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h >> index a6de09c5e47f..3e45a7618ab3 100644 >> --- a/include/drm/drm_hdcp.h >> +++ b/include/drm/drm_hdcp.h >> @@ -250,4 +250,19 @@ struct hdcp2_dp_errata_stream_type { >> #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) >> #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) >> >> +/* >> + * Library functions for endianness are aligned for 16/32/64 bits. >> + * But hdcp sequence numbers are 24bits. So for their Byte swapping, >> + * a conversion function is developed. >> + */ >> +static inline void reverse_endianness(u8 *dest, size_t sz, u8 *src) > This feels a bit fake-generic and doesn't fit that well into what you want > it to do in the code actually. What about: > > u32 drm_hdcp2_seq_num_to_u32(u8 seq_num[HDCP_2_2_SEQ_NUM_LEN]) > { > return seq_num[2] | seq_num[1] << 8 | seq_num[0] << 16; > } Understood the point. we need drm_hdcp2_u32_to_seq_num too... I will add that too. -Ram > > (I didn't check the math). > > I think this would both make the code more clearer and avoid the problem > of "shouldn't we make sure this works for everything and put it into > linux/string.h?" > > Again I'll check the actual hdcp2 flow later on. > > In general I'm kinda not happy with the shim midlayer design, but I wasn't > happy with that with hdcp1 either, and hdcp2 is just an extension, and I > don't really have a better idea either so seems all good to me. > -Daniel > >> +{ >> + u32 index; >> + >> + if (!sz || sz > sizeof(u32)) >> + return; >> + for (index = 0; index < sz; index++) >> + dest[sz - index - 1] = src[index]; >> +} >> + >> #endif >> -- >> 2.7.4 >>
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 0d7fea9c9bb1..679f3c164582 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -1069,7 +1069,7 @@ static int hdcp2_prepare_skey(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int +static int hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, struct hdcp2_rep_send_receiverid_list *rep_topology, @@ -1099,7 +1099,7 @@ hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector, return ret; } -static __attribute__((unused)) int +static int hdcp2_verify_mprime(struct intel_connector *connector, struct hdcp2_rep_stream_ready *stream_ready) { @@ -1315,6 +1315,121 @@ static int hdcp2_session_key_exchange(struct intel_connector *connector) return 0; } +static +int hdcp2_propagate_stream_management_info(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_rep_stream_manage stream_manage; + struct hdcp2_rep_stream_ready stream_ready; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + int ret; + + /* Prepare RepeaterAuth_Stream_Manage msg */ + msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE; + reverse_endianness(msgs.stream_manage.seq_num_m, HDCP_2_2_SEQ_NUM_LEN, + (u8 *)&hdcp->seq_num_m); + + /* K no of streams is fixed as 1. Stored as big-endian. */ + msgs.stream_manage.k = __swab16(1); + + /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ + msgs.stream_manage.streams[0].stream_id = 0; + msgs.stream_manage.streams[0].stream_type = hdcp->content_type; + + /* Send it to Repeater */ + ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage, + sizeof(msgs.stream_manage)); + if (ret < 0) + return ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY, + &msgs.stream_ready, sizeof(msgs.stream_ready)); + if (ret < 0) + return ret; + + hdcp->mei_data.seq_num_m = hdcp->seq_num_m; + hdcp->mei_data.streams[0].stream_type = hdcp->content_type; + + ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); + if (ret < 0) + return ret; + + hdcp->seq_num_m++; + + if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) { + DRM_DEBUG_KMS("seq_num_m roll over.\n"); + return -1; + } + + return 0; +} + +static +int hdcp2_authenticate_repeater_topology(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct intel_hdcp *hdcp = &connector->hdcp; + union { + struct hdcp2_rep_send_receiverid_list recvid_list; + struct hdcp2_rep_send_ack rep_ack; + } msgs; + const struct intel_hdcp_shim *shim = hdcp->shim; + u8 *rx_info; + u32 seq_num_v; + int ret; + + ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_SEND_RECVID_LIST, + &msgs.recvid_list, sizeof(msgs.recvid_list)); + if (ret < 0) + return ret; + + rx_info = msgs.recvid_list.rx_info; + + if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rx_info[1]) || + HDCP_2_2_MAX_DEVS_EXCEEDED(rx_info[1])) { + DRM_DEBUG_KMS("Topology Max Size Exceeded\n"); + return -EINVAL; + } + + /* Converting and Storing the seq_num_v to local variable as DWORD */ + reverse_endianness((u8 *)&seq_num_v, HDCP_2_2_SEQ_NUM_LEN, + msgs.recvid_list.seq_num_v); + + if (seq_num_v < hdcp->seq_num_v) { + /* Roll over of the seq_num_v from repeater. Reauthenticate. */ + DRM_DEBUG_KMS("Seq_num_v roll over.\n"); + return -EINVAL; + } + + ret = hdcp2_verify_rep_topology_prepare_ack(connector, + &msgs.recvid_list, + &msgs.rep_ack); + if (ret < 0) + return ret; + + hdcp->seq_num_v = seq_num_v; + ret = shim->write_2_2_msg(intel_dig_port, &msgs.rep_ack, + sizeof(msgs.rep_ack)); + if (ret < 0) + return ret; + + return 0; +} + +static int hdcp2_authenticate_repeater(struct intel_connector *connector) +{ + int ret; + + ret = hdcp2_authenticate_repeater_topology(connector); + if (ret < 0) + return ret; + + return hdcp2_propagate_stream_management_info(connector); +} + static int hdcp2_authenticate_sink(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); @@ -1356,6 +1471,12 @@ static int hdcp2_authenticate_sink(struct intel_connector *connector) sizeof(stream_type_msg)); if (ret < 0) return ret; + } else if (hdcp->is_repeater) { + ret = hdcp2_authenticate_repeater(connector); + if (ret < 0) { + DRM_DEBUG_KMS("Repeater Auth Failed. Err: %d\n", ret); + return ret; + } } hdcp->mei_data.streams[0].stream_type = hdcp->content_type; diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index a6de09c5e47f..3e45a7618ab3 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -250,4 +250,19 @@ struct hdcp2_dp_errata_stream_type { #define HDCP_2_2_HDMI_RXSTATUS_READY(x) ((x) & BIT(2)) #define HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(x) ((x) & BIT(3)) +/* + * Library functions for endianness are aligned for 16/32/64 bits. + * But hdcp sequence numbers are 24bits. So for their Byte swapping, + * a conversion function is developed. + */ +static inline void reverse_endianness(u8 *dest, size_t sz, u8 *src) +{ + u32 index; + + if (!sz || sz > sizeof(u32)) + return; + for (index = 0; index < sz; index++) + dest[sz - index - 1] = src[index]; +} + #endif
Implements the HDCP2.2 repeaters authentication steps such as verifying the downstream topology and sending stream management information. v2: Rebased. v3: No Changes. v4: -EINVAL is returned for topology error and rollover scenario. Endianness conversion func from drm_hdcp.h is used [Uma] v5: Rebased as part of patches reordering. Defined the mei service functions [Daniel] v6: Redefined the mei service functions as per comp redesign. v7: %s/uintxx_t/uxx Check for comp_master is removed. v8: Adjust to the new mei interface. style issue fixed. Signed-off-by: Ramalingam C <ramalingam.c@intel.com> --- drivers/gpu/drm/i915/intel_hdcp.c | 125 +++++++++++++++++++++++++++++++++++++- include/drm/drm_hdcp.h | 15 +++++ 2 files changed, 138 insertions(+), 2 deletions(-)