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drm_dp_mst_helper.h
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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> #include <drm/drm_atomic.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 * @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 { /** * @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; 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; /** * @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; }; /** * 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. * @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 { /** * @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; 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); }; #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; 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; }; #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; /** * @conn_base_id: DRM connector ID this mgr is connected to. Only used * to build the MST connector path value. */ int conn_base_id; /** * @down_rep_recv: Message receiver state for down replies. This and * @up_req_recv are only ever access from the work item, which is * serialised. */ struct drm_dp_sideband_msg_rx down_rep_recv; /** * @up_req_recv: Message receiver state for up requests. This and * @down_rep_recv are only ever access from the work item, which is * serialised. */ struct drm_dp_sideband_msg_rx up_req_recv; /** * @lock: protects mst state, primary, dpcd. */ struct mutex 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; /** * @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, the &drm_dp_mst_branch.txslost and * &drm_dp_sideband_msg_tx.state once they are queued */ struct mutex qlock; /** * @tx_msg_downq: List of pending down replies. */ 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. */ struct drm_dp_vcpi **proposed_vcpis; /** * @payloads: Array of 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_connector_list: List of to be destroyed connectors. */ struct list_head destroy_connector_list; /** * @destroy_connector_lock: Protects @connector_list. */ struct mutex destroy_connector_lock; /** * @destroy_connector_work: Work item to destroy connectors. Needed to * avoid locking inversion. */ struct work_struct destroy_connector_work; }; 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 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 __must_check drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); 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 __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 __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); 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