> 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.
> v9:
> s/mei_hdcp_ddi/mei_fw_ddi
> s/i915_port/mei_i915_port [Tomas]
> renamed func as mei_hdcp_* [Tomas]
> Instead of macro, inline func for ddi index is used. [Tomas]
> v10:
> Switch case for the coversion between i915_port to mei_ddi [Tomas]
> Kernel doc fix.
>
> Signed-off-by: Ramalingam C <ramalinga...@intel.com>
> Reviewed-by: Uma Shankar <uma.shan...@intel.com>
Signed-off-by: Tomas Winkler <tomas.wink...@intel.com>
> ---
> drivers/misc/mei/hdcp/mei_hdcp.c | 94
> ++++++++++++++++++++++++++++++++++++++++
> drivers/misc/mei/hdcp/mei_hdcp.h | 11 +++++
> 2 files changed, 105 insertions(+)
>
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 8df069c1b0cc..952bae79dd02 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -23,6 +23,100 @@
> #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"
> +
> +static inline u8 mei_get_ddi_index(enum port port) {
> + switch (port) {
> + case PORT_A:
> + return MEI_DDI_A;
> + case PORT_B ... PORT_F:
> + return (u8)port;
> + default:
> + return MEI_DDI_INVALID_PORT;
> + }
> +}
> +
> +/**
> + * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in
> +ME FW
> + * @dev: device corresponding to the mei_cl_device
> + * @data: Intel HW specific hdcp data
> + * @ake_data: AKE_Init msg output.
> + *
> + * Return: 0 on Success, <0 on Failure.
> + */
> +static int
> +mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
> + struct hdcp2_ake_init *ake_data)
> +{
> + 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 = mei_get_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_hdcp_initiate_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..1eca72a9c1c2 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.h
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.h
> @@ -363,4 +363,15 @@ struct wired_cmd_repeater_auth_stream_req_out {
> struct hdcp_port_id port;
> } __packed;
>
> +enum mei_fw_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,
> +};
> #endif /* __MEI_HDCP_H__ */
> --
> 2.7.4
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