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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/drm_dp_helper.h> 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 * @kref: reference count for 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; 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 edid *cached_edid; /* for DP logical ports - make tiling work */ bool has_audio; }; /** * 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. * @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 { 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; /* global unique identifier to identify branch devices */ u8 guid[16]; }; /* 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; }; #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 { 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; }; /* 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; 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; } 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, const char *path); void (*register_connector)(struct drm_connector *connector); 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, dpcd. * @mst_state: if this manager is enabled for an MST capable port. * @mst_primary: pointer to the primary branch device. * @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 + dpcd */ bool mst_state; struct drm_dp_mst_branch *mst_primary; 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; bool tx_down_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; struct list_head destroy_connector_list; struct mutex destroy_connector_lock; struct work_struct destroy_connector_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_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); bool drm_dp_mst_port_has_audio(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); 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_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