root/include/drm/drm_dp_mst_helper.h

/*
 * Copyright © 2014 Red Hat.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */
#ifndef _DRM_DP_MST_HELPER_H_
#define _DRM_DP_MST_HELPER_H_

#include <linux/types.h>
#include <drm/drm_dp_helper.h>

struct drm_dp_mst_branch;

/**
 * struct drm_dp_vcpi - Virtual Channel Payload Identifer
 * @vcpi: Virtual channel ID.
 * @pbn: Payload Bandwidth Number for this channel
 * @aligned_pbn: PBN aligned with slot size
 * @num_slots: number of slots for this PBN
 */
struct drm_dp_vcpi {
        int vcpi;
        int pbn;
        int aligned_pbn;
        int num_slots;
};

/**
 * struct drm_dp_mst_port - MST port
 * @kref: reference count for this port.
 * @guid_valid: for DP 1.2 devices if we have validated the GUID.
 * @guid: guid for DP 1.2 device on this port.
 * @port_num: port number
 * @input: if this port is an input port.
 * @mcs: message capability status - DP 1.2 spec.
 * @ddps: DisplayPort Device Plug Status - DP 1.2
 * @pdt: Peer Device Type
 * @ldps: Legacy Device Plug Status
 * @dpcd_rev: DPCD revision of device on this port
 * @num_sdp_streams: Number of simultaneous streams
 * @num_sdp_stream_sinks: Number of stream sinks
 * @available_pbn: Available bandwidth for this port.
 * @next: link to next port on this branch device
 * @mstb: branch device attach below this port
 * @aux: i2c aux transport to talk to device connected to this port.
 * @parent: branch device parent of this port
 * @vcpi: Virtual Channel Payload info for this port.
 * @connector: DRM connector this port is connected to.
 * @mgr: topology manager this port lives under.
 *
 * This structure represents an MST port endpoint on a device somewhere
 * in the MST topology.
 */
struct drm_dp_mst_port {
        struct kref kref;

        /* if dpcd 1.2 device is on this port - its GUID info */
        bool guid_valid;
        u8 guid[16];

        u8 port_num;
        bool input;
        bool mcs;
        bool ddps;
        u8 pdt;
        bool ldps;
        u8 dpcd_rev;
        u8 num_sdp_streams;
        u8 num_sdp_stream_sinks;
        uint16_t available_pbn;
        struct list_head next;
        struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
        struct drm_dp_aux aux; /* i2c bus for this port? */
        struct drm_dp_mst_branch *parent;

        struct drm_dp_vcpi vcpi;
        struct drm_connector *connector;
        struct drm_dp_mst_topology_mgr *mgr;
};

/**
 * struct drm_dp_mst_branch - MST branch device.
 * @kref: reference count for this port.
 * @rad: Relative Address to talk to this branch device.
 * @lct: Link count total to talk to this branch device.
 * @num_ports: number of ports on the branch.
 * @msg_slots: one bit per transmitted msg slot.
 * @ports: linked list of ports on this branch.
 * @port_parent: pointer to the port parent, NULL if toplevel.
 * @mgr: topology manager for this branch device.
 * @tx_slots: transmission slots for this device.
 * @last_seqno: last sequence number used to talk to this.
 * @link_address_sent: if a link address message has been sent to this device yet.
 *
 * This structure represents an MST branch device, there is one
 * primary branch device at the root, along with any others connected
 * to downstream ports
 */
struct drm_dp_mst_branch {
        struct kref kref;
        u8 rad[8];
        u8 lct;
        int num_ports;

        int msg_slots;
        struct list_head ports;

        /* list of tx ops queue for this port */
        struct drm_dp_mst_port *port_parent;
        struct drm_dp_mst_topology_mgr *mgr;

        /* slots are protected by mstb->mgr->qlock */
        struct drm_dp_sideband_msg_tx *tx_slots[2];
        int last_seqno;
        bool link_address_sent;
};


/* sideband msg header - not bit struct */
struct drm_dp_sideband_msg_hdr {
        u8 lct;
        u8 lcr;
        u8 rad[8];
        bool broadcast;
        bool path_msg;
        u8 msg_len;
        bool somt;
        bool eomt;
        bool seqno;
};

struct drm_dp_nak_reply {
        u8 guid[16];
        u8 reason;
        u8 nak_data;
};

struct drm_dp_link_address_ack_reply {
        u8 guid[16];
        u8 nports;
        struct drm_dp_link_addr_reply_port {
                bool input_port;
                u8 peer_device_type;
                u8 port_number;
                bool mcs;
                bool ddps;
                bool legacy_device_plug_status;
                u8 dpcd_revision;
                u8 peer_guid[16];
                u8 num_sdp_streams;
                u8 num_sdp_stream_sinks;
        } ports[16];
};

struct drm_dp_remote_dpcd_read_ack_reply {
        u8 port_number;
        u8 num_bytes;
        u8 bytes[255];
};

struct drm_dp_remote_dpcd_write_ack_reply {
        u8 port_number;
};

struct drm_dp_remote_dpcd_write_nak_reply {
        u8 port_number;
        u8 reason;
        u8 bytes_written_before_failure;
};

struct drm_dp_remote_i2c_read_ack_reply {
        u8 port_number;
        u8 num_bytes;
        u8 bytes[255];
};

struct drm_dp_remote_i2c_read_nak_reply {
        u8 port_number;
        u8 nak_reason;
        u8 i2c_nak_transaction;
};

struct drm_dp_remote_i2c_write_ack_reply {
        u8 port_number;
};


struct drm_dp_sideband_msg_rx {
        u8 chunk[48];
        u8 msg[256];
        u8 curchunk_len;
        u8 curchunk_idx; /* chunk we are parsing now */
        u8 curchunk_hdrlen;
        u8 curlen; /* total length of the msg */
        bool have_somt;
        bool have_eomt;
        struct drm_dp_sideband_msg_hdr initial_hdr;
};


struct drm_dp_allocate_payload {
        u8 port_number;
        u8 number_sdp_streams;
        u8 vcpi;
        u16 pbn;
        u8 sdp_stream_sink[8];
};

struct drm_dp_allocate_payload_ack_reply {
        u8 port_number;
        u8 vcpi;
        u16 allocated_pbn;
};

struct drm_dp_connection_status_notify {
        u8 guid[16];
        u8 port_number;
        bool legacy_device_plug_status;
        bool displayport_device_plug_status;
        bool message_capability_status;
        bool input_port;
        u8 peer_device_type;
};

struct drm_dp_remote_dpcd_read {
        u8 port_number;
        u32 dpcd_address;
        u8 num_bytes;
};

struct drm_dp_remote_dpcd_write {
        u8 port_number;
        u32 dpcd_address;
        u8 num_bytes;
        u8 *bytes;
};

struct drm_dp_remote_i2c_read {
        u8 num_transactions;
        u8 port_number;
        struct {
                u8 i2c_dev_id;
                u8 num_bytes;
                u8 *bytes;
                u8 no_stop_bit;
                u8 i2c_transaction_delay;
        } transactions[4];
        u8 read_i2c_device_id;
        u8 num_bytes_read;
};

struct drm_dp_remote_i2c_write {
        u8 port_number;
        u8 write_i2c_device_id;
        u8 num_bytes;
        u8 *bytes;
};

/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
struct drm_dp_port_number_req {
        u8 port_number;
};

struct drm_dp_enum_path_resources_ack_reply {
        u8 port_number;
        u16 full_payload_bw_number;
        u16 avail_payload_bw_number;
};

/* covers POWER_DOWN_PHY, POWER_UP_PHY */
struct drm_dp_port_number_rep {
        u8 port_number;
};

struct drm_dp_query_payload {
        u8 port_number;
        u8 vcpi;
};

struct drm_dp_resource_status_notify {
        u8 port_number;
        u8 guid[16];
        u16 available_pbn;
};

struct drm_dp_query_payload_ack_reply {
        u8 port_number;
        u8 allocated_pbn;
};

struct drm_dp_sideband_msg_req_body {
        u8 req_type;
        union ack_req {
                struct drm_dp_connection_status_notify conn_stat;
                struct drm_dp_port_number_req port_num;
                struct drm_dp_resource_status_notify resource_stat;

                struct drm_dp_query_payload query_payload;
                struct drm_dp_allocate_payload allocate_payload;

                struct drm_dp_remote_dpcd_read dpcd_read;
                struct drm_dp_remote_dpcd_write dpcd_write;

                struct drm_dp_remote_i2c_read i2c_read;
                struct drm_dp_remote_i2c_write i2c_write;
        } u;
};

struct drm_dp_sideband_msg_reply_body {
        u8 reply_type;
        u8 req_type;
        union ack_replies {
                struct drm_dp_nak_reply nak;
                struct drm_dp_link_address_ack_reply link_addr;
                struct drm_dp_port_number_rep port_number;

                struct drm_dp_enum_path_resources_ack_reply path_resources;
                struct drm_dp_allocate_payload_ack_reply allocate_payload;
                struct drm_dp_query_payload_ack_reply query_payload;

                struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
                struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
                struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;

                struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
                struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
                struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
        } u;
};

/* msg is queued to be put into a slot */
#define DRM_DP_SIDEBAND_TX_QUEUED 0
/* msg has started transmitting on a slot - still on msgq */
#define DRM_DP_SIDEBAND_TX_START_SEND 1
/* msg has finished transmitting on a slot - removed from msgq only in slot */
#define DRM_DP_SIDEBAND_TX_SENT 2
/* msg has received a response - removed from slot */
#define DRM_DP_SIDEBAND_TX_RX 3
#define DRM_DP_SIDEBAND_TX_TIMEOUT 4

struct drm_dp_sideband_msg_tx {
        u8 msg[256];
        u8 chunk[48];
        u8 cur_offset;
        u8 cur_len;
        struct drm_dp_mst_branch *dst;
        struct list_head next;
        int seqno;
        int state;
        bool path_msg;
        struct drm_dp_sideband_msg_reply_body reply;
};

/* sideband msg handler */
struct drm_dp_mst_topology_mgr;
struct drm_dp_mst_topology_cbs {
        /* create a connector for a port */
        struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *path);
        void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
                                  struct drm_connector *connector);
        void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);

};

#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)

#define DP_PAYLOAD_LOCAL 1
#define DP_PAYLOAD_REMOTE 2
#define DP_PAYLOAD_DELETE_LOCAL 3

struct drm_dp_payload {
        int payload_state;
        int start_slot;
        int num_slots;
        int vcpi;
};

/**
 * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
 * @dev: device pointer for adding i2c devices etc.
 * @cbs: callbacks for connector addition and destruction.
 * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
 * @aux: aux channel for the DP connector.
 * @max_payloads: maximum number of payloads the GPU can generate.
 * @conn_base_id: DRM connector ID this mgr is connected to.
 * @down_rep_recv: msg receiver state for down replies.
 * @up_req_recv: msg receiver state for up requests.
 * @lock: protects mst state, primary, guid, dpcd.
 * @mst_state: if this manager is enabled for an MST capable port.
 * @mst_primary: pointer to the primary branch device.
 * @guid_valid: GUID valid for the primary branch device.
 * @guid: GUID for primary port.
 * @dpcd: cache of DPCD for primary port.
 * @pbn_div: PBN to slots divisor.
 *
 * This struct represents the toplevel displayport MST topology manager.
 * There should be one instance of this for every MST capable DP connector
 * on the GPU.
 */
struct drm_dp_mst_topology_mgr {

        struct device *dev;
        struct drm_dp_mst_topology_cbs *cbs;
        int max_dpcd_transaction_bytes;
        struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
        int max_payloads;
        int conn_base_id;

        /* only ever accessed from the workqueue - which should be serialised */
        struct drm_dp_sideband_msg_rx down_rep_recv;
        struct drm_dp_sideband_msg_rx up_req_recv;

        /* pointer to info about the initial MST device */
        struct mutex lock; /* protects mst_state + primary + guid + dpcd */

        bool mst_state;
        struct drm_dp_mst_branch *mst_primary;
        /* primary MST device GUID */
        bool guid_valid;
        u8 guid[16];
        u8 dpcd[DP_RECEIVER_CAP_SIZE];
        u8 sink_count;
        int pbn_div;
        int total_slots;
        int avail_slots;
        int total_pbn;

        /* messages to be transmitted */
        /* qlock protects the upq/downq and in_progress,
           the mstb tx_slots and txmsg->state once they are queued */
        struct mutex qlock;
        struct list_head tx_msg_downq;
        struct list_head tx_msg_upq;
        bool tx_down_in_progress;
        bool tx_up_in_progress;

        /* payload info + lock for it */
        struct mutex payload_lock;
        struct drm_dp_vcpi **proposed_vcpis;
        struct drm_dp_payload *payloads;
        unsigned long payload_mask;
        unsigned long vcpi_mask;

        wait_queue_head_t tx_waitq;
        struct work_struct work;

        struct work_struct tx_work;
};

int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id);

void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);


int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);


int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);


enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);

struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);


int drm_dp_calc_pbn_mode(int clock, int bpp);


bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);


void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);


void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
                                struct drm_dp_mst_port *port);


int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
                           int pbn);


int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);


int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);

int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);

void drm_dp_mst_dump_topology(struct seq_file *m,
                              struct drm_dp_mst_topology_mgr *mgr);

void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
#endif