[v14,21/33] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

Submitted by Ramalingam C on Feb. 16, 2019, 5:37 p.m.

Details

Message ID 1550338640-17470-22-git-send-email-ramalingam.c@intel.com
State New
Headers show
Series "drm/i915: Implement HDCP2.2" ( rev: 1 ) in Intel GFX

Not browsing as part of any series.

Commit Message

Ramalingam C Feb. 16, 2019, 5:37 p.m.
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.
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 <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 94 ++++++++++++++++++++++++++++++++++++++++
 drivers/misc/mei/hdcp/mei_hdcp.h | 11 +++++
 2 files changed, 105 insertions(+)

Patch hide | download patch | download mbox

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__ */

Comments

> 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 <ramalingam.c@intel.com>
> Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@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