Re: [PATCH v8 03/35] linux/mei: Header for mei_hdcp driver interface

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

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Hi,

In one of the offline discussion Tomas has shared his review comments on v8.
So I am sharing the abstract of his suggestions here for the discussion and for the agreement of interface in the community.
Tomas please correct/add if I am missing any points.

 1. Remove the include/linux/mei_hdcp.h to make the i915-mei interface
    more generic.
     1. Move the definition of the struct mei_hdcp_data to i915 and
        mei_hdcp.c and pass the void* in the ops' functions.
     2. Move the conversion of enum port value to mei_ddi_port value
        into mei_hdcp.c. Let I915 pass the enum port value as such.
     3. Modified local definition of the struct mei_hdcp_data will looks
        like
     4.

        +/* hdcp data per port */
        +struct hdcp_port_data {
        + short int port;
        + u8 port_type;
        + u8 protocol;
        + u16 k;
        + u32 seq_num_m;
        + struct hdcp2_streamid_type *streams;
          };

 2. Add K-Doc compliant commenting in the mei_hdcp.c

I have implemented these changes and posted for intel-gfx-trybot. Just incase anyone wants to
refer the code please look at https://patchwork.freedesktop.org/series/53655/ .
Not shared on #intel-gfx as further review discussions are on-going on intel-gfx.

--Ram

On 11/27/2018 4:13 PM, Ramalingam C wrote:
> Data structures and Enum for the I915-MEI_HDCP interface are defined
> at <linux/mei_hdcp.h>
>
> v2:
>    Rebased.
> v3:
>    mei_cl_device is removed from mei_hdcp_data [Tomas]
> v4:
>    Comment style and typo fixed [Uma]
> v5:
>    Rebased.
> v6:
>    No changes.
> v7:
>    Remove redundant text from the License header
>    Change uintXX_t type to uXX_t types
>    Remove unneeded include to mei_cl_bus.h
>    Coding style fixed [Uma]
> V8:
>    Tab cleanup
>    Fix kdoc and namespaces
>    Update MAINTAINERS
>
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
> ---
>   MAINTAINERS              |  1 +
>   include/linux/mei_hdcp.h | 91 ++++++++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 92 insertions(+)
>   create mode 100644 include/linux/mei_hdcp.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1026150ae90f..2fd6555bf040 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7540,6 +7540,7 @@ L:	linux-kernel@vger.kernel.org
>   S:	Supported
>   F:	include/uapi/linux/mei.h
>   F:	include/linux/mei_cl_bus.h
> +F:	include/linux/mei_hdcp.h
>   F:	drivers/misc/mei/*
>   F:	drivers/watchdog/mei_wdt.c
>   F:	Documentation/misc-devices/mei/*
> diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
> new file mode 100644
> index 000000000000..716123003dd1
> --- /dev/null
> +++ b/include/linux/mei_hdcp.h
> @@ -0,0 +1,91 @@
> +/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
> +/*
> + * Copyright © 2017-2018 Intel Corporation
> + *
> + * Authors:
> + * Ramalingam C <ramalingam.c@intel.com>
> + */
> +
> +#ifndef _LINUX_MEI_HDCP_H
> +#define _LINUX_MEI_HDCP_H
> +
> +/**
> + * enum mei_hdcp_ddi - The physical digital display interface (DDI)
> + *     available on the platform
> + * @MEI_DDI_INVALID_PORT: Not a valid port
> + * @MEI_DDI_RANGE_BEGIN: Beginning of the valid DDI port range
> + * @MEI_DDI_B: Port DDI B
> + * @MEI_DDI_C: Port DDI C
> + * @MEI_DDI_D: Port DDI D
> + * @MEI_DDI_E: Port DDI E
> + * @MEI_DDI_F: Port DDI F
> + * @MEI_DDI_A: Port DDI A
> + * @MEI_DDI_RANGE_END: End of the valid DDI port range
> + */
> +enum mei_hdcp_ddi {
> +	MEI_DDI_INVALID_PORT = 0x00,
> +
> +	MEI_DDI_RANGE_BEGIN = 0x01,
> +	MEI_DDI_B           = 0x01,
> +	MEI_DDI_C           = 0x02,
> +	MEI_DDI_D           = 0x03,
> +	MEI_DDI_E           = 0x04,
> +	MEI_DDI_F           = 0x05,
> +	MEI_DDI_A           = 0x07,
> +	MEI_DDI_RANGE_END   = MEI_DDI_A,
> +};
> +
> +/**
> + * enum mei_hdcp_port_type - The types of HDCP 2.2 ports supported
> + *
> + * @MEI_HDCP_PORT_TYPE_INVALID: Invalid port
> + * @MEI_HDCP_PORT_TYPE_INTEGRATED: ports that are integrated into Intel HW
> + * @MEI_HDCP_PORT_TYPE_LSPCON: discrete wired Tx port with LSPCON (HDMI 2.0)
> + * @MEI_HDCP_PORT_TYPE_CPDP: discrete wired Tx port using the CPDP (DP 1.3)
> + */
> +enum mei_hdcp_port_type {
> +	MEI_HDCP_PORT_TYPE_INVALID    = 0x00,
> +	MEI_HDCP_PORT_TYPE_INTEGRATED = 0x01,
> +	MEI_HDCP_PORT_TYPE_LSPCON     = 0x02,
> +	MEI_HDCP_PORT_TYPE_CPDP       = 0x03,
> +};
> +
> +/*
> + * enum mei_hdcp_wired_protocol - Supported integrated wired HDCP protocol.
> + * @HDCP_PROTOCOL_INVALID: invalid type
> + * @HDCP_PROTOCOL_HDMI: HDMI
> + * @HDCP_PROTOCOL_DP: DP
> + *
> + * Based on this value, Minor difference needed between wired specifications
> + * are handled.
> + */
> +enum mei_hdcp_wired_protocol {
> +	MEI_HDCP_PROTOCOL_INVALID,
> +	MEI_HDCP_PROTOCOL_HDMI,
> +	MEI_HDCP_PROTOCOL_DP
> +};
> +
> +/**
> + * struct mei_hdcp_data - Input data to the mei_hdcp APIs
> + * @port: The physical port (ddi).
> + * @port_type: The port type.
> + * @protocol: The Protocol on the port.
> + * @k: Number of streams transmitted on the port.
> + *     In case of HDMI & DP SST, a single stream will be
> + *     transmitted on the port.
> + * @seq_num_m: A sequence number of RepeaterAuth_Stream_Manage msg propagated.
> + *     Initialized to 0 on AKE_INIT. Incremented after every successful
> + *     transmission of RepeaterAuth_Stream_Manage message. When it rolls
> + *     over re-Auth has to be triggered.
> + * @streams: array[k] of streamid
> + */
> +struct mei_hdcp_data {
> +	enum mei_hdcp_ddi port;
> +	enum mei_hdcp_port_type port_type;
> +	enum mei_hdcp_wired_protocol protocol;
> +	u16 k;
> +	u32 seq_num_m;
> +	struct hdcp2_streamid_type *streams;
> +};
> +
> +#endif /* !_LINUX_MEI_HDCP_H */

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