[PATCH v3 17/40] misc/mei/hdcp: Enabling the HDCP authentication

[Ramalingam C]

On Wednesday 09 May 2018 07:25 PM, Shankar, Uma wrote:
>
>> -----Original Message-----
>> From: dri-devel [mailto:dri-devel-bounces at lists.freedesktop.org] On Behalf Of
>> Ramalingam C
>> Sent: Tuesday, April 3, 2018 7:28 PM
>> To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>> seanpaul at chromium.org; daniel at ffwll.ch; chris at chris-wilson.co.uk;
>> jani.nikula at linux.intel.com; Winkler, Tomas <tomas.winkler at intel.com>;
>> Usyskin, Alexander <alexander.usyskin at intel.com>
>> Cc: Vivi, Rodrigo <rodrigo.vivi at intel.com>
>> Subject: [PATCH v3 17/40] misc/mei/hdcp: Enabling the HDCP authentication
>>
>> Request to ME to configure a port as authenticated.
>>
>> On Success, ME FW will mark th eport as authenticated and provides HDCP chipper
> Rectify "the". Also it should be HDCP cipher.
>
>> of the port with the encryption keys.
>>
>> Enabling the Authentication can be requested once the all stages of HDCP2.2
>> authentication is completed by interating with ME FW.
> Typo in interacting.
Will fix it.

--Ram
>
>> Only after this stage, driver can enable the HDCP encryption for the port, through
>> HW registers.
>>
>> v2:
>>   Rebased.
>> v3:
>>   cldev is passed as first parameter [Tomas]
>>   Redundant comments and cast are removed [Tomas]
>>
>> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>> ---
>> drivers/misc/mei/hdcp/mei_hdcp.c | 54
>> ++++++++++++++++++++++++++++++++++++++++
>> include/linux/mei_hdcp.h         |  7 ++++++
>> 2 files changed, 61 insertions(+)
>>
>> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>> b/drivers/misc/mei/hdcp/mei_hdcp.c
>> index 68eb5267a8e7..b5d1da41f1d9 100644
>> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>> @@ -632,6 +632,60 @@ int mei_verify_mprime(struct mei_cl_device *cldev,
>> struct mei_hdcp_data *data,  }  EXPORT_SYMBOL(mei_verify_mprime);
>>
>> +/**
>> + * mei_enable_hdcp_authentication:
>> + *	Function to request ME FW to mark a port as authenticated.
>> + *
>> + * @cldev		: Pointer for mei client device
>> + * @data		: Intel HW specific Data
>> + *
>> + * Returns 0 on Success, <0 on Failure
>> + */
>> +int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
>> +				   struct mei_hdcp_data *data)
>> +{
>> +	struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
>> +	struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
>> +	struct device *dev;
>> +	ssize_t byte;
>> +
>> +	if (!data)
>> +		return -EINVAL;
>> +
>> +	dev = &cldev->dev;
>> +
>> +	enable_auth_in.header.api_version = HDCP_API_VERSION;
>> +	enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
>> +	enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
>> +	enable_auth_in.header.buffer_len =
>> WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
>> +
>> +	enable_auth_in.port.integrated_port_type = data->port_type;
>> +	enable_auth_in.port.physical_port = data->port;
>> +	enable_auth_in.stream_type = data->streams[0].stream_type;
> Check for data->streams.
>
>> +
>> +	byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
>> +			      sizeof(enable_auth_in));
>> +	if (byte < 0) {
>> +		dev_dbg(dev, "mei_cldev_send failed. %d\n", (int)byte);
>> +		return byte;
>> +	}
>> +
>> +	byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
>> +			      sizeof(enable_auth_out));
>> +	if (byte < 0) {
>> +		dev_dbg(dev, "mei_cldev_recv failed. %d\n", (int)byte);
>> +		return byte;
>> +	}
>> +
>> +	if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>> +		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
>> +			WIRED_ENABLE_AUTH,
>> enable_auth_out.header.status);
>> +		return -1;
>> +	}
> Leave a blank line here.
>
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(mei_enable_hdcp_authentication);
>> +
>> void mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool enabled)  {
>> 	if (enabled)
>> diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h index
>> dbc216e13f97..2366d0741abe 100644
>> --- a/include/linux/mei_hdcp.h
>> +++ b/include/linux/mei_hdcp.h
>> @@ -136,6 +136,8 @@ mei_repeater_check_flow_prepare_ack(struct
>> mei_cl_device *cldev,
>> 				    struct hdcp2_rep_send_ack *rep_send_ack);
>> int mei_verify_mprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
>> 		      struct hdcp2_rep_stream_ready *stream_ready);
>> +int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
>> +				   struct mei_hdcp_data *data);
>> #else
>> static int mei_cldev_register_notify(struct notifier_block *nb)  { @@ -209,5
>> +211,10 @@ int mei_verify_mprime(struct mei_cl_device *cldev, struct
>> mei_hdcp_data *data,  {
>> 	return -ENODEV;
>> }
>> +static inline int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
>> +						 struct mei_hdcp_data *data)
>> +{
>> +	return -ENODEV;
>> +}
>> #endif /* defined (CONFIG_INTEL_MEI_HDCP) */  #endif /* defined
>> (_LINUX_MEI_HDCP_H) */
>> --
>> 2.7.4
>>
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