> -----Original Message-----
> From: C, Ramalingam
> Sent: Wednesday, May 16, 2018 18:20
> To: Usyskin, Alexander <[email protected]>; intel-
> [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; Winkler, Tomas <[email protected]>
> Cc: Vivi, Rodrigo <[email protected]>
> Subject: Re: [PATCH v3 08/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx
> Session
>
>
>
> On Wednesday 04 April 2018 12:15 PM, Usyskin, Alexander wrote:
> >
> >> -----Original Message-----
> >> From: C, Ramalingam
> >> Sent: Tuesday, April 03, 2018 16:57
> >> To: [email protected]; [email protected];
> >> [email protected]; [email protected]; [email protected];
> >> [email protected]; Winkler, Tomas
> >> <[email protected]>; Usyskin, Alexander
> >> <[email protected]>
> >> Cc: Vivi, Rodrigo <[email protected]>; C, Ramalingam
> >> <[email protected]>
> >> Subject: [PATCH v3 08/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx
> >> Session
> >>
> >> Request ME FW to start the HDCP2.2 session for a intel port.
> >> Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and
> sent
> >> 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]
> >>
> >> Signed-off-by: Ramalingam C <[email protected]>
> >> ---
> >> drivers/misc/mei/hdcp/mei_hdcp.c | 68
> >> ++++++++++++++++++++++++++++++++++++++++
> >> include/linux/mei_hdcp.h | 11 +++++++
> >> 2 files changed, 79 insertions(+)
> >>
> >> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> >> b/drivers/misc/mei/hdcp/mei_hdcp.c
> >> index 2811a25f8c57..7caee0947761 100644
> >> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> >> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> >> @@ -33,9 +33,77 @@
> >> #include <linux/mei_cl_bus.h>
> >> #include <linux/notifier.h>
> >> #include <linux/mei_hdcp.h>
> >> +#include <drm/drm_connector.h>
> >> +
> >> +#include "mei_hdcp.h"
> >>
> >> static BLOCKING_NOTIFIER_HEAD(mei_cldev_notifier_list);
> >>
> >> +/**
> >> + * mei_initiate_hdcp2_session:
> >> + * Function to start a Wired HDCP2.2 Tx Session with ME FW
> >> + *
> >> + * @cldev : Pointer for mei client device
> >> + * @data : Intel HW specific Data
> >> + * @ake_data : ptr to store AKE_Init
> >> + *
> >> + * Returns 0 on Success, <0 on Failure.
> >> + */
> >> +int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
> >> + struct mei_hdcp_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 device *dev;
> >> + ssize_t byte;
> >> +
> >> + if (!data || !ake_data)
> >> + return -EINVAL;
> >> +
> >> + dev = &cldev->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 = data->port;
> >> + session_init_in.protocol = (uint8_t)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. %d\n", (int)byte);
> > %zd don't require (int)
> Sure. Thanks
> >> + 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. %d\n", (int)byte);
> > %zd don't require (int)
> >> + 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 -1;
> > It will be better to return some meaningful error code here.
> I dont think default error codes will match here. And at present other side
> I915 doesn't expect the reason but the failure state.
> May be we could do something like -(session_init_out.header.status). But
> error codes of ME FW is not known to I915.
>
> So may be as of now lets keep it as some -ve return value -1?
-1 is -EPERM - that may confuse, better to use some neutral value, like -EIO
>
> --Ram
> >> + }
> >> +
> >> + 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,
> >> + sizeof(session_init_out.r_tx));
> >> +
> >> + return 0;
> >> +}
> >> +EXPORT_SYMBOL(mei_initiate_hdcp2_session);
> >> +
> >> 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 634c1a5bdf1e..bb4f27d3abcb 100644
> >> --- a/include/linux/mei_hdcp.h
> >> +++ b/include/linux/mei_hdcp.h
> >> @@ -28,6 +28,7 @@
> >> #define _LINUX_MEI_HDCP_H
> >>
> >> #include <linux/mei_cl_bus.h>
> >> +#include <drm/drm_hdcp.h>
> >>
> >> enum mei_cldev_state {
> >> MEI_CLDEV_DISABLED,
> >> @@ -105,6 +106,9 @@ struct mei_hdcp_data {
> >> #ifdef CONFIG_INTEL_MEI_HDCP
> >> int mei_cldev_register_notify(struct notifier_block *nb);
> >> int mei_cldev_unregister_notify(struct notifier_block *nb);
> >> +int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
> >> + struct mei_hdcp_data *data,
> >> + struct hdcp2_ake_init *ake_data);
> >> #else
> >> static int mei_cldev_register_notify(struct notifier_block *nb)
> >> {
> >> @@ -114,5 +118,12 @@ static int mei_cldev_unregister_notify(struct
> >> notifier_block *nb)
> >> {
> >> return -ENODEV;
> >> }
> >> +static inline
> >> +int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
> >> + struct mei_hdcp_data *data,
> >> + struct hdcp2_ake_init *ake_data) {
> >> + return -ENODEV;
> >> +}
> >> #endif /* defined (CONFIG_INTEL_MEI_HDCP) */
> >> #endif /* defined (_LINUX_MEI_HDCP_H) */
> >> --
> >> 2.7.4
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