Re: [PATCH v10 25/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

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

Thanks Tomas.

On 2/5/2019 6:39 PM, Winkler, Tomas wrote:
>>> Request ME FW to start the HDCP2.2 session for an intel port.
>>> Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and sends
>> to
>>> ME FW.
>>>
>>> On Success, ME FW will start a HDCP2.2 session for the port and
>>> provides the content for HDCP2.2 AKE_Init message.
>>>
>>> v2: Rebased.
>>> v3:
>>>   cldev is add as a separate parameter [Tomas]
>>>   Redundant comment and typecast are removed [Tomas]
>>> v4:
>>>   %zd is used for size [Alexander]
>>>   %s/return -1/return -EIO [Alexander]
>>>   Spellings in commit msg is fixed [Uma]
>>> v5: Rebased.
>>> v6:
>>>   Collected the rb-ed by.
>>>   Realigning the patches in the series.
>>> v7:
>>>   Adjust to the new mei interface.
>>>   Fix for kdoc.
>>> v8:
>>>   K-Doc Addition.
>>>   memcpy for const length.
>>>
>>> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
>>> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
>> Latest set look ok. You can keep the RB.
>>
>>> ---
>>> drivers/misc/mei/hdcp/mei_hdcp.c | 82
>>> ++++++++++++++++++++++++++++++++++++++++
>>> drivers/misc/mei/hdcp/mei_hdcp.h | 28 ++++++++++++++
>>> 2 files changed, 110 insertions(+)
>>>
>>> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>>> b/drivers/misc/mei/hdcp/mei_hdcp.c
>>> index ca5010ad7dd7..534d29c8ee86 100644
>>> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
>>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>>> @@ -23,6 +23,88 @@
>>> #include <linux/slab.h>
>>> #include <linux/uuid.h>
>>> #include <linux/mei_cl_bus.h>
>>> +#include <drm/drm_connector.h>
>>> +#include <drm/i915_component.h>
>>> +#include <drm/i915_mei_hdcp_interface.h>
>>> +
>>> +#include "mei_hdcp.h"
>>> +
>>> +/**
>>> + * mei_initiate_hdcp2_session() - Initiate a Wired HDCP2.2 Tx Session
>>> +in ME FW
>>> + * @dev: device corresponding to the mei_cl_device
>>> + * @hdcp_data: Intel HW specific hdcp data
>>> + * @ake_data: AKE_Init msg output.
>>> + *
>>> + * Return:  0 on Success, <0 on Failure.
>>> + */
>>> +static int
>>> +mei_initiate_hdcp2_session(struct device *dev, struct hdcp_port_data *data,
>>> +			   struct hdcp2_ake_init *ake_data) {
>
> Breaking naming conventions : all functions should be prefixed with mei_hdcp_
>
> e.g. mei_hdcp_ initiate_session()
I will rename all the function name similarly.

--Ram
>
>>> +	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
>>> +	struct wired_cmd_initiate_hdcp2_session_out
>>> +						session_init_out = { { 0 } };
>>> +	struct mei_cl_device *cldev;
>>> +	ssize_t byte;
>>> +
>>> +	if (!dev || !data || !ake_data)
>>> +		return -EINVAL;
>>> +
>>> +	cldev = to_mei_cl_device(dev);
>>> +
>>> +	session_init_in.header.api_version = HDCP_API_VERSION;
>>> +	session_init_in.header.command_id =
>>> WIRED_INITIATE_HDCP2_SESSION;
>>> +	session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
>>> +	session_init_in.header.buffer_len =
>>> +
>>> 	WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
>>> +
>>> +	session_init_in.port.integrated_port_type = data->port_type;
>>> +	session_init_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data-
>>>> port);
>>> +	session_init_in.protocol = data->protocol;
>>> +
>>> +	byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
>>> +			      sizeof(session_init_in));
>>> +	if (byte < 0) {
>>> +		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
>>> +		return byte;
>>> +	}
>>> +
>>> +	byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
>>> +			      sizeof(session_init_out));
>>> +	if (byte < 0) {
>>> +		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
>>> +		return byte;
>>> +	}
>>> +
>>> +	if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>>> +		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
>>> +			WIRED_INITIATE_HDCP2_SESSION,
>>> +			session_init_out.header.status);
>>> +		return -EIO;
>>> +	}
>>> +
>>> +	ake_data->msg_id = HDCP_2_2_AKE_INIT;
>>> +	ake_data->tx_caps = session_init_out.tx_caps;
>>> +	memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static __attribute__((unused))
>>> +struct i915_hdcp_component_ops mei_hdcp_ops = {
>>> +	.owner = THIS_MODULE,
>>> +	.initiate_hdcp2_session = mei_initiate_hdcp2_session,
>>> +	.verify_receiver_cert_prepare_km = NULL,
>>> +	.verify_hprime = NULL,
>>> +	.store_pairing_info = NULL,
>>> +	.initiate_locality_check = NULL,
>>> +	.verify_lprime = NULL,
>>> +	.get_session_key = NULL,
>>> +	.repeater_check_flow_prepare_ack = NULL,
>>> +	.verify_mprime = NULL,
>>> +	.enable_hdcp_authentication = NULL,
>>> +	.close_hdcp_session = NULL,
>>> +};
>>>
>>> static int mei_hdcp_probe(struct mei_cl_device *cldev,
>>> 			  const struct mei_cl_device_id *id) diff --git
>>> a/drivers/misc/mei/hdcp/mei_hdcp.h b/drivers/misc/mei/hdcp/mei_hdcp.h
>>> index 582a7e27ae29..f831db3cbd54 100644
>>> --- a/drivers/misc/mei/hdcp/mei_hdcp.h
>>> +++ b/drivers/misc/mei/hdcp/mei_hdcp.h
>>> @@ -363,4 +363,32 @@ struct wired_cmd_repeater_auth_stream_req_out {
>>> 	struct hdcp_port_id	port;
>>> } __packed;
>>>
>>> +enum mei_hdcp_ddi {
>>> +	MEI_DDI_INVALID_PORT = 0x0,
>>> +
>>> +	MEI_DDI_B = 1,
>>> +	MEI_DDI_C,
>>> +	MEI_DDI_D,
>>> +	MEI_DDI_E,
>>> +	MEI_DDI_F,
>>> +	MEI_DDI_A = 7,
>>> +	MEI_DDI_RANGE_END = MEI_DDI_A,
>>> +};
>>> +
>>> +enum i915_port {
> We've already reviewed. Move to i915 header or use mei_ prefix?
renaming it to mei_i915_port, like wise s/mei_hdcp_ddi/mei_fw_ddi to 
make more sense

--Ram
>>> +	PORT_NONE = -1,
>>> +
>>> +	PORT_A = 0,
>>> +	PORT_B,
>>> +	PORT_C,
>>> +	PORT_D,
>>> +	PORT_E,
>>> +	PORT_F,
>>> +	I915_MAX_PORTS,
>>> +};
>>> +
>>> +#define GET_MEI_DDI_INDEX(p) ({
>>> 	\
>>> +	enum i915_port __p = (enum i915_port)(p);			\
>>> +	__p == PORT_A ? MEI_DDI_A : (enum mei_hdcp_ddi)__p;
>> 	\
>>> +})
>>> #endif /* __MEI_HDCP_H__ */
>>> --
>>> 2.7.4

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