Re: [PATCH v10 4/6] misc/mei/hdcp: Fill transcoder index in port info

Ramalingam C
2019-08-27T14:31:21Z

On 2019-08-27 at 19:49:19 +0530, Winkler, Tomas wrote:
> > For gen12+ platform we need to pass the transcoder info as part of the port
> > info into ME FW.
> >
> > This change fills the payload for ME FW from hdcp_port_data.
> >
> > Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> > Acked-by: Jani Nikula <jani.nikula@intel.com>
> > Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
> > ---
> > drivers/misc/mei/hdcp/mei_hdcp.c | 11 +++++++++++
> > drivers/misc/mei/hdcp/mei_hdcp.h | 4 +++-
> > 2 files changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> > b/drivers/misc/mei/hdcp/mei_hdcp.c
> > index 3638c77eba26..93027fd96c71 100644
> > --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> > +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> > @@ -58,6 +58,7 @@ mei_hdcp_initiate_session(struct device *dev, struct
> > hdcp_port_data *data,
> >
> > session_init_in.port.integrated_port_type = data->port_type;
> > session_init_in.port.physical_port = (u8)data->fw_ddi;
> > + session_init_in.port.attached_transcoder = (u8)data->fw_tc;
> > session_init_in.protocol = data->protocol;
> >
> > byte = mei_cldev_send(cldev, (u8 *)&session_init_in, @@ -127,6
> > +128,7 @@ mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
> >
> > verify_rxcert_in.port.integrated_port_type = data->port_type;
> > verify_rxcert_in.port.physical_port = (u8)data->fw_ddi;
> > + verify_rxcert_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > verify_rxcert_in.cert_rx = rx_cert->cert_rx;
> > memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
> > @@ -197,6 +199,7 @@ mei_hdcp_verify_hprime(struct device *dev, struct
> > hdcp_port_data *data,
> >
> > send_hprime_in.port.integrated_port_type = data->port_type;
> > send_hprime_in.port.physical_port = (u8)data->fw_ddi;
> > + send_hprime_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
> > HDCP_2_2_H_PRIME_LEN);
> > @@ -254,6 +257,7 @@ mei_hdcp_store_pairing_info(struct device *dev, struct
> > hdcp_port_data *data,
> >
> > pairing_info_in.port.integrated_port_type = data->port_type;
> > pairing_info_in.port.physical_port = (u8)data->fw_ddi;
> > + pairing_info_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
> > HDCP_2_2_E_KH_KM_LEN);
> > @@ -312,6 +316,7 @@ mei_hdcp_initiate_locality_check(struct device *dev,
> >
> > lc_init_in.port.integrated_port_type = data->port_type;
> > lc_init_in.port.physical_port = (u8)data->fw_ddi;
> > + lc_init_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
> > if (byte < 0) {
> > @@ -367,6 +372,7 @@ mei_hdcp_verify_lprime(struct device *dev, struct
> > hdcp_port_data *data,
> >
> > verify_lprime_in.port.integrated_port_type = data->port_type;
> > verify_lprime_in.port.physical_port = (u8)data->fw_ddi;
> > + verify_lprime_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
> > HDCP_2_2_L_PRIME_LEN);
> > @@ -424,6 +430,7 @@ static int mei_hdcp_get_session_key(struct device
> > *dev,
> >
> > get_skey_in.port.integrated_port_type = data->port_type;
> > get_skey_in.port.physical_port = (u8)data->fw_ddi;
> > + get_skey_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
> > if (byte < 0) {
> > @@ -488,6 +495,7 @@ mei_hdcp_repeater_check_flow_prepare_ack(struct
> > device *dev,
> >
> > verify_repeater_in.port.integrated_port_type = data->port_type;
> > verify_repeater_in.port.physical_port = (u8)data->fw_ddi;
> > + verify_repeater_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
> > HDCP_2_2_RXINFO_LEN);
> > @@ -558,6 +566,7 @@ static int mei_hdcp_verify_mprime(struct device *dev,
> >
> > verify_mprime_in.port.integrated_port_type = data->port_type;
> > verify_mprime_in.port.physical_port = (u8)data->fw_ddi;
> > + verify_mprime_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > memcpy(verify_mprime_in.m_prime, stream_ready->m_prime,
> > HDCP_2_2_MPRIME_LEN);
> > @@ -619,6 +628,7 @@ static int mei_hdcp_enable_authentication(struct
> > device *dev,
> >
> > enable_auth_in.port.integrated_port_type = data->port_type;
> > enable_auth_in.port.physical_port = (u8)data->fw_ddi;
> > + enable_auth_in.port.attached_transcoder = (u8)data->fw_tc;
> > enable_auth_in.stream_type = data->streams[0].stream_type;
> >
> > byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in, @@ -673,6
> > +683,7 @@ mei_hdcp_close_session(struct device *dev, struct hdcp_port_data
> > *data)
> >
> > session_close_in.port.integrated_port_type = data->port_type;
> > session_close_in.port.physical_port = (u8)data->fw_ddi;
> > + session_close_in.port.attached_transcoder = (u8)data->fw_tc;
> >
> > byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
> > sizeof(session_close_in));
> > diff --git a/drivers/misc/mei/hdcp/mei_hdcp.h
> > b/drivers/misc/mei/hdcp/mei_hdcp.h
> > index e60282eb2d48..58e439d2fc1a 100644
> > --- a/drivers/misc/mei/hdcp/mei_hdcp.h
> > +++ b/drivers/misc/mei/hdcp/mei_hdcp.h
> > @@ -184,8 +184,10 @@ struct hdcp_cmd_no_data {
> > /* Uniquely identifies the hdcp port being addressed for a given command. */
> > struct hdcp_port_id {
> > u8 integrated_port_type;
> > + /* Used until Gen11.5. Must be zero for Gen11.5+ */
> What are you reference here, the member bellow or above? - It is better to document it in using kdoc!
> Next, what part of the code is validating this?
This is documentation for physical_port. As these structures are ME FW
API payloads, i dont think we need a kdoc on it. Please let me know if
you think otherwise.

This is checked at ME FW and returned with ERROR Code.
And as only I915 knows the GEN#, i915 takes care of the filling this
member with Zero(INVALID_PORT), for gen12+.

>
> > u8 physical_port;
> > - u16 reserved;
>
> > + u8 attached_transcoder;
> Also here need the documentation
In this file we are not documenting each member of the struct. IMHO variable
name is self documenting.

Since there was a special expectation on physical port on gen12+, I have
added the comment.

-Ram
> > + u8 reserved;
> > } __packed;
> >
> > /*
> > --
> > 2.20.1