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 /*
  * 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/display/drm_dp_helper.h>
 #include <drm/drm_atomic.h>
 
 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
 #include <linux/stackdepot.h>
 #include <linux/timekeeping.h>
 
 enum drm_dp_mst_topology_ref_type {
     DRM_DP_MST_TOPOLOGY_REF_GET,
     DRM_DP_MST_TOPOLOGY_REF_PUT,
 };
 
 struct drm_dp_mst_topology_ref_history {
     struct drm_dp_mst_topology_ref_entry {
         enum drm_dp_mst_topology_ref_type type;
         int count;
         ktime_t ts_nsec;
         depot_stack_handle_t backtrace;
     } *entries;
     int len;
 };
 #endif /* IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) */
 
 struct drm_dp_mst_branch;
 
 /**
  * struct drm_dp_vcpi - Virtual Channel Payload Identifier
  * @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
  * @port_num: port number
  * @input: if this port is an input port. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @mcs: message capability status - DP 1.2 spec. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @ddps: DisplayPort Device Plug Status - DP 1.2. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @pdt: Peer Device Type. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @ldps: Legacy Device Plug Status. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @dpcd_rev: DPCD revision of device on this port. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @num_sdp_streams: Number of simultaneous streams. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @num_sdp_stream_sinks: Number of stream sinks. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @full_pbn: Max possible bandwidth for this port. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @next: link to next port on this branch device
  * @aux: i2c aux transport to talk to device connected to this port, protected
  * by &drm_dp_mst_topology_mgr.base.lock.
  * @parent: branch device parent of this port
  * @vcpi: Virtual Channel Payload info for this port.
  * @connector: DRM connector this port is connected to. Protected by
  * &drm_dp_mst_topology_mgr.base.lock.
  * @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 {
     /**
      * @topology_kref: refcount for this port's lifetime in the topology,
      * only the DP MST helpers should need to touch this
      */
     struct kref topology_kref;
 
     /**
      * @malloc_kref: refcount for the memory allocation containing this
      * structure. See drm_dp_mst_get_port_malloc() and
      * drm_dp_mst_put_port_malloc().
      */
     struct kref malloc_kref;
 
 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
     /**
      * @topology_ref_history: A history of each topology
      * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
      */
     struct drm_dp_mst_topology_ref_history topology_ref_history;
 #endif
 
     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 full_pbn;
     struct list_head next;
     /**
      * @mstb: the branch device connected to this port, if there is one.
      * This should be considered protected for reading by
      * &drm_dp_mst_topology_mgr.lock. There are two exceptions to this:
      * &drm_dp_mst_topology_mgr.up_req_work and
      * &drm_dp_mst_topology_mgr.work, which do not grab
      * &drm_dp_mst_topology_mgr.lock during reads but are the only
      * updaters of this list and are protected from writing concurrently
      * by &drm_dp_mst_topology_mgr.probe_lock.
      */
     struct drm_dp_mst_branch *mstb;
     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;
 
     /**
      * @cached_edid: for DP logical ports - make tiling work by ensuring
      * that the EDID for all connectors is read immediately.
      */
     struct edid *cached_edid;
     /**
      * @has_audio: Tracks whether the sink connector to this port is
      * audio-capable.
      */
     bool has_audio;
 
     /**
      * @fec_capable: bool indicating if FEC can be supported up to that
      * point in the MST topology.
      */
     bool fec_capable;
 };
 
 /* 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_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_mst_branch - MST branch device.
  * @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.
  * @port_parent: pointer to the port parent, NULL if toplevel.
  * @mgr: topology manager for this branch device.
  * @link_address_sent: if a link address message has been sent to this device yet.
  * @guid: guid for DP 1.2 branch device. port under this branch can be
  * identified by port #.
  *
  * This structure represents an MST branch device, there is one
  * primary branch device at the root, along with any other branches connected
  * to downstream port of parent branches.
  */
 struct drm_dp_mst_branch {
     /**
      * @topology_kref: refcount for this branch device's lifetime in the
      * topology, only the DP MST helpers should need to touch this
      */
     struct kref topology_kref;
 
     /**
      * @malloc_kref: refcount for the memory allocation containing this
      * structure. See drm_dp_mst_get_mstb_malloc() and
      * drm_dp_mst_put_mstb_malloc().
      */
     struct kref malloc_kref;
 
 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
     /**
      * @topology_ref_history: A history of each topology
      * reference/dereference. See CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS.
      */
     struct drm_dp_mst_topology_ref_history topology_ref_history;
 #endif
 
     /**
      * @destroy_next: linked-list entry used by
      * drm_dp_delayed_destroy_work()
      */
     struct list_head destroy_next;
 
     u8 rad[8];
     u8 lct;
     int num_ports;
 
     /**
      * @ports: the list of ports on this branch device. This should be
      * considered protected for reading by &drm_dp_mst_topology_mgr.lock.
      * There are two exceptions to this:
      * &drm_dp_mst_topology_mgr.up_req_work and
      * &drm_dp_mst_topology_mgr.work, which do not grab
      * &drm_dp_mst_topology_mgr.lock during reads but are the only
      * updaters of this list and are protected from updating the list
      * concurrently by @drm_dp_mst_topology_mgr.probe_lock
      */
     struct list_head ports;
 
     struct drm_dp_mst_port *port_parent;
     struct drm_dp_mst_topology_mgr *mgr;
 
     bool link_address_sent;
 
     /* global unique identifier to identify branch devices */
     u8 guid[16];
 };
 
 
 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_query_stream_enc_status_ack_reply {
     /* Bit[23:16]- Stream Id */
     u8 stream_id;
 
     /* Bit[15]- Signed */
     bool reply_signed;
 
     /* Bit[10:8]- Stream Output Sink Type */
     bool unauthorizable_device_present;
     bool legacy_device_present;
     bool query_capable_device_present;
 
     /* Bit[12:11]- Stream Output CP Type */
     bool hdcp_1x_device_present;
     bool hdcp_2x_device_present;
 
     /* Bit[4]- Stream Authentication */
     bool auth_completed;
 
     /* Bit[3]- Stream Encryption */
     bool encryption_enabled;
 
     /* Bit[2]- Stream Repeater Function Present */
     bool repeater_present;
 
     /* Bit[1:0]- Stream State */
     u8 state;
 };
 
 #define DRM_DP_MAX_SDP_STREAMS 16
 struct drm_dp_allocate_payload {
     u8 port_number;
     u8 number_sdp_streams;
     u8 vcpi;
     u16 pbn;
     u8 sdp_stream_sink[DRM_DP_MAX_SDP_STREAMS];
 };
 
 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;
 };
 
 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
 struct drm_dp_remote_i2c_read {
     u8 num_transactions;
     u8 port_number;
     struct drm_dp_remote_i2c_read_tx {
         u8 i2c_dev_id;
         u8 num_bytes;
         u8 *bytes;
         u8 no_stop_bit;
         u8 i2c_transaction_delay;
     } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
     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;
 };
 
 struct drm_dp_query_stream_enc_status {
     u8 stream_id;
     u8 client_id[7];    /* 56-bit nonce */
     u8 stream_event;
     bool valid_stream_event;
     u8 stream_behavior;
     u8 valid_stream_behavior;
 };
 
 /* 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;
     bool fec_capable;
     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;
     u16 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;
 
         struct drm_dp_query_stream_enc_status enc_status;
     } 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;
 
         struct drm_dp_query_stream_enc_status_ack_reply enc_status;
     } 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, const char *path);
     /*
      * Checks for any pending MST interrupts, passing them to MST core for
      * processing, the same way an HPD IRQ pulse handler would do this.
      * If provided MST core calls this callback from a poll-waiting loop
      * when waiting for MST down message replies. The driver is expected
      * to guard against a race between this callback and the driver's HPD
      * IRQ pulse handler.
      */
     void (*poll_hpd_irq)(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;
 };
 
 #define to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
 
 struct drm_dp_vcpi_allocation {
     struct drm_dp_mst_port *port;
     int vcpi;
     int pbn;
     bool dsc_enabled;
     struct list_head next;
 };
 
 struct drm_dp_mst_topology_state {
     struct drm_private_state base;
     struct list_head vcpis;
     struct drm_dp_mst_topology_mgr *mgr;
     u8 total_avail_slots;
     u8 start_slot;
 };
 
 #define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
 
 /**
  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
  *
  * 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 {
     /**
      * @base: Base private object for atomic
      */
     struct drm_private_obj base;
 
     /**
      * @dev: device pointer for adding i2c devices etc.
      */
     struct drm_device *dev;
     /**
      * @cbs: callbacks for connector addition and destruction.
      */
     const struct drm_dp_mst_topology_cbs *cbs;
     /**
      * @max_dpcd_transaction_bytes: maximum number of bytes to read/write
      * in one go.
      */
     int max_dpcd_transaction_bytes;
     /**
      * @aux: AUX channel for the DP MST connector this topolgy mgr is
      * controlling.
      */
     struct drm_dp_aux *aux;
     /**
      * @max_payloads: maximum number of payloads the GPU can generate.
      */
     int max_payloads;
     /**
      * @max_lane_count: maximum number of lanes the GPU can drive.
      */
     int max_lane_count;
     /**
      * @max_link_rate: maximum link rate per lane GPU can output, in kHz.
      */
     int max_link_rate;
     /**
      * @conn_base_id: DRM connector ID this mgr is connected to. Only used
      * to build the MST connector path value.
      */
     int conn_base_id;
 
     /**
      * @up_req_recv: Message receiver state for up requests.
      */
     struct drm_dp_sideband_msg_rx up_req_recv;
 
     /**
      * @down_rep_recv: Message receiver state for replies to down
      * requests.
      */
     struct drm_dp_sideband_msg_rx down_rep_recv;
 
     /**
      * @lock: protects @mst_state, @mst_primary, @dpcd, and
      * @payload_id_table_cleared.
      */
     struct mutex lock;
 
     /**
      * @probe_lock: Prevents @work and @up_req_work, the only writers of
      * &drm_dp_mst_port.mstb and &drm_dp_mst_branch.ports, from racing
      * while they update the topology.
      */
     struct mutex probe_lock;
 
     /**
      * @mst_state: If this manager is enabled for an MST capable port. False
      * if no MST sink/branch devices is connected.
      */
     bool mst_state : 1;
 
     /**
      * @payload_id_table_cleared: Whether or not we've cleared the payload
      * ID table for @mst_primary. Protected by @lock.
      */
     bool payload_id_table_cleared : 1;
 
     /**
      * @mst_primary: Pointer to the primary/first branch device.
      */
     struct drm_dp_mst_branch *mst_primary;
 
     /**
      * @dpcd: Cache of DPCD for primary port.
      */
     u8 dpcd[DP_RECEIVER_CAP_SIZE];
     /**
      * @sink_count: Sink count from DEVICE_SERVICE_IRQ_VECTOR_ESI0.
      */
     u8 sink_count;
     /**
      * @pbn_div: PBN to slots divisor.
      */
     int pbn_div;
 
     /**
      * @funcs: Atomic helper callbacks
      */
     const struct drm_private_state_funcs *funcs;
 
     /**
      * @qlock: protects @tx_msg_downq and &drm_dp_sideband_msg_tx.state
      */
     struct mutex qlock;
 
     /**
      * @tx_msg_downq: List of pending down requests
      */
     struct list_head tx_msg_downq;
 
     /**
      * @payload_lock: Protect payload information.
      */
     struct mutex payload_lock;
     /**
      * @proposed_vcpis: Array of pointers for the new VCPI allocation. The
      * VCPI structure itself is &drm_dp_mst_port.vcpi, and the size of
      * this array is determined by @max_payloads.
      */
     struct drm_dp_vcpi **proposed_vcpis;
     /**
      * @payloads: Array of payloads. The size of this array is determined
      * by @max_payloads.
      */
     struct drm_dp_payload *payloads;
     /**
      * @payload_mask: Elements of @payloads actually in use. Since
      * reallocation of active outputs isn't possible gaps can be created by
      * disabling outputs out of order compared to how they've been enabled.
      */
     unsigned long payload_mask;
     /**
      * @vcpi_mask: Similar to @payload_mask, but for @proposed_vcpis.
      */
     unsigned long vcpi_mask;
 
     /**
      * @tx_waitq: Wait to queue stall for the tx worker.
      */
     wait_queue_head_t tx_waitq;
     /**
      * @work: Probe work.
      */
     struct work_struct work;
     /**
      * @tx_work: Sideband transmit worker. This can nest within the main
      * @work worker for each transaction @work launches.
      */
     struct work_struct tx_work;
 
     /**
      * @destroy_port_list: List of to be destroyed connectors.
      */
     struct list_head destroy_port_list;
     /**
      * @destroy_branch_device_list: List of to be destroyed branch
      * devices.
      */
     struct list_head destroy_branch_device_list;
     /**
      * @delayed_destroy_lock: Protects @destroy_port_list and
      * @destroy_branch_device_list.
      */
     struct mutex delayed_destroy_lock;
 
     /**
      * @delayed_destroy_wq: Workqueue used for delayed_destroy_work items.
      * A dedicated WQ makes it possible to drain any requeued work items
      * on it.
      */
     struct workqueue_struct *delayed_destroy_wq;
 
     /**
      * @delayed_destroy_work: Work item to destroy MST port and branch
      * devices, needed to avoid locking inversion.
      */
     struct work_struct delayed_destroy_work;
 
     /**
      * @up_req_list: List of pending up requests from the topology that
      * need to be processed, in chronological order.
      */
     struct list_head up_req_list;
     /**
      * @up_req_lock: Protects @up_req_list
      */
     struct mutex up_req_lock;
     /**
      * @up_req_work: Work item to process up requests received from the
      * topology. Needed to avoid blocking hotplug handling and sideband
      * transmissions.
      */
     struct work_struct up_req_work;
 
 #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS)
     /**
      * @topology_ref_history_lock: protects
      * &drm_dp_mst_port.topology_ref_history and
      * &drm_dp_mst_branch.topology_ref_history.
      */
     struct mutex topology_ref_history_lock;
 #endif
 };
 
 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr,
                  struct drm_device *dev, struct drm_dp_aux *aux,
                  int max_dpcd_transaction_bytes,
                  int max_payloads,
                  int max_lane_count, int max_link_rate,
                  int conn_base_id);
 
 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
 
 bool drm_dp_read_mst_cap(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]);
 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);
 
 
 int
 drm_dp_mst_detect_port(struct drm_connector *connector,
                struct drm_modeset_acquire_ctx *ctx,
                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_get_vc_payload_bw(const struct drm_dp_mst_topology_mgr *mgr,
                  int link_rate, int link_lane_count);
 
 int drm_dp_calc_pbn_mode(int clock, int bpp, bool dsc);
 
 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
                   struct drm_dp_mst_port *port, int pbn, int slots);
 
 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 
 
 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
 
 void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap);
 
 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 start_slot);
 
 
 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 __must_check
 drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
                    bool sync);
 
 ssize_t drm_dp_mst_dpcd_read(struct drm_dp_aux *aux,
                  unsigned int offset, void *buffer, size_t size);
 ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
                   unsigned int offset, void *buffer, size_t size);
 
 int drm_dp_mst_connector_late_register(struct drm_connector *connector,
                        struct drm_dp_mst_port *port);
 void drm_dp_mst_connector_early_unregister(struct drm_connector *connector,
                        struct drm_dp_mst_port *port);
 
 struct drm_dp_mst_topology_state *drm_atomic_get_mst_topology_state(struct drm_atomic_state *state,
                                     struct drm_dp_mst_topology_mgr *mgr);
 int __must_check
 drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
                   struct drm_dp_mst_topology_mgr *mgr,
                   struct drm_dp_mst_port *port, int pbn,
                   int pbn_div);
 int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
                  struct drm_dp_mst_port *port,
                  int pbn, int pbn_div,
                  bool enable);
 int __must_check
 drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state,
                   struct drm_dp_mst_topology_mgr *mgr);
 int __must_check
 drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
                  struct drm_dp_mst_topology_mgr *mgr,
                  struct drm_dp_mst_port *port);
 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
                  struct drm_dp_mst_port *port, bool power_up);
 int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
         struct drm_dp_mst_port *port,
         struct drm_dp_query_stream_enc_status_ack_reply *status);
 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
 
 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
 void drm_dp_mst_put_port_malloc(struct drm_dp_mst_port *port);
 
 struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
 
 extern const struct drm_private_state_funcs drm_dp_mst_topology_state_funcs;
 
 /**
  * __drm_dp_mst_state_iter_get - private atomic state iterator function for
  * macro-internal use
  * @state: &struct drm_atomic_state pointer
  * @mgr: pointer to the &struct drm_dp_mst_topology_mgr iteration cursor
  * @old_state: optional pointer to the old &struct drm_dp_mst_topology_state
  * iteration cursor
  * @new_state: optional pointer to the new &struct drm_dp_mst_topology_state
  * iteration cursor
  * @i: int iteration cursor, for macro-internal use
  *
  * Used by for_each_oldnew_mst_mgr_in_state(),
  * for_each_old_mst_mgr_in_state(), and for_each_new_mst_mgr_in_state(). Don't
  * call this directly.
  *
  * Returns:
  * True if the current &struct drm_private_obj is a &struct
  * drm_dp_mst_topology_mgr, false otherwise.
  */
 static inline bool
 __drm_dp_mst_state_iter_get(struct drm_atomic_state *state,
                 struct drm_dp_mst_topology_mgr **mgr,
                 struct drm_dp_mst_topology_state **old_state,
                 struct drm_dp_mst_topology_state **new_state,
                 int i)
 {
     struct __drm_private_objs_state *objs_state = &state->private_objs[i];
 
     if (objs_state->ptr->funcs != &drm_dp_mst_topology_state_funcs)
         return false;
 
     *mgr = to_dp_mst_topology_mgr(objs_state->ptr);
     if (old_state)
         *old_state = to_dp_mst_topology_state(objs_state->old_state);
     if (new_state)
         *new_state = to_dp_mst_topology_state(objs_state->new_state);
 
     return true;
 }
 
 /**
  * for_each_oldnew_mst_mgr_in_state - iterate over all DP MST topology
  * managers in an atomic update
  * @__state: &struct drm_atomic_state pointer
  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
  * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
  * state
  * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
  * state
  * @__i: int iteration cursor, for macro-internal use
  *
  * This iterates over all DRM DP MST topology managers in an atomic update,
  * tracking both old and new state. This is useful in places where the state
  * delta needs to be considered, for example in atomic check functions.
  */
 #define for_each_oldnew_mst_mgr_in_state(__state, mgr, old_state, new_state, __i) \
     for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
         for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), &(new_state), (__i)))
 
 /**
  * for_each_old_mst_mgr_in_state - iterate over all DP MST topology managers
  * in an atomic update
  * @__state: &struct drm_atomic_state pointer
  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
  * @old_state: &struct drm_dp_mst_topology_state iteration cursor for the old
  * state
  * @__i: int iteration cursor, for macro-internal use
  *
  * This iterates over all DRM DP MST topology managers in an atomic update,
  * tracking only the old state. This is useful in disable functions, where we
  * need the old state the hardware is still in.
  */
 #define for_each_old_mst_mgr_in_state(__state, mgr, old_state, __i) \
     for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
         for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), &(old_state), NULL, (__i)))
 
 /**
  * for_each_new_mst_mgr_in_state - iterate over all DP MST topology managers
  * in an atomic update
  * @__state: &struct drm_atomic_state pointer
  * @mgr: &struct drm_dp_mst_topology_mgr iteration cursor
  * @new_state: &struct drm_dp_mst_topology_state iteration cursor for the new
  * state
  * @__i: int iteration cursor, for macro-internal use
  *
  * This iterates over all DRM DP MST topology managers in an atomic update,
  * tracking only the new state. This is useful in enable functions, where we
  * need the new state the hardware should be in when the atomic commit
  * operation has completed.
  */
 #define for_each_new_mst_mgr_in_state(__state, mgr, new_state, __i) \
     for ((__i) = 0; (__i) < (__state)->num_private_objs; (__i)++) \
         for_each_if(__drm_dp_mst_state_iter_get((__state), &(mgr), NULL, &(new_state), (__i)))
 
 #endif

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