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

[Ramalingam C <ramalingam.c@intel.com>]

On 2019-08-27 at 20:07:04 +0530, Winkler, Tomas wrote:
> 
> > 
> > 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.
> I asked for kdoc, because it is not clear from the comment what member are you commenting on,
> In other words the comment is lacking the subject. 
I will rephrase it as /* physical_port is used until Gen11.5. Must be zero for Gen11.5+ */
Hope that looks good to you.

-Ram
> 
> > 
> > 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
> > >
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