/*
* 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>
#include <drm/drm_fixed.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) */
enum drm_dp_mst_payload_allocation {
DRM_DP_MST_PAYLOAD_ALLOCATION_NONE,
DRM_DP_MST_PAYLOAD_ALLOCATION_LOCAL,
DRM_DP_MST_PAYLOAD_ALLOCATION_DFP,
DRM_DP_MST_PAYLOAD_ALLOCATION_REMOTE,
};
struct drm_dp_mst_branch;
/**
* 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.
* @passthrough_aux: parent aux to which DSC pass-through requests should be
* sent, only set if DSC pass-through is possible.
* @parent: branch device parent of 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_aux *passthrough_aux;
struct drm_dp_mst_branch *parent;
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.
*/
const struct drm_edid *cached_edid;
/**
* @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 */
guid_t guid;
};
struct drm_dp_nak_reply {
guid_t guid;
u8 reason;
u8 nak_data;
};
struct drm_dp_link_address_ack_reply {
guid_t guid;
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;
guid_t peer_guid;
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 {
guid_t guid;
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;
guid_t guid;
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 to_dp_mst_topology_state(x) container_of(x, struct drm_dp_mst_topology_state, base)
/**
* struct drm_dp_mst_atomic_payload - Atomic state struct for an MST payload
*
* The primary atomic state structure for a given MST payload. Stores information like current
* bandwidth allocation, intended action for this payload, etc.
*/
struct drm_dp_mst_atomic_payload {
/** @port: The MST port assigned to this payload */
struct drm_dp_mst_port *port;
/**
* @vc_start_slot: The time slot that this payload starts on. Because payload start slots
* can't be determined ahead of time, the contents of this value are UNDEFINED at atomic
* check time. This shouldn't usually matter, as the start slot should never be relevant for
* atomic state computations.
*
* Since this value is determined at commit time instead of check time, this value is
* protected by the MST helpers ensuring that async commits operating on the given topology
* never run in parallel. In the event that a driver does need to read this value (e.g. to
* inform hardware of the starting timeslot for a payload), the driver may either:
*
* * Read this field during the atomic commit after
* drm_dp_mst_atomic_wait_for_dependencies() has been called, which will ensure the
* previous MST states payload start slots have been copied over to the new state. Note
* that a new start slot won't be assigned/removed from this payload until
* drm_dp_add_payload_part1()/drm_dp_remove_payload_part2() have been called.
* * Acquire the MST modesetting lock, and then wait for any pending MST-related commits to
* get committed to hardware by calling drm_crtc_commit_wait() on each of the
* &drm_crtc_commit structs in &drm_dp_mst_topology_state.commit_deps.
*
* If neither of the two above solutions suffice (e.g. the driver needs to read the start
* slot in the middle of an atomic commit without waiting for some reason), then drivers
* should cache this value themselves after changing payloads.
*/
s8 vc_start_slot;
/** @vcpi: The Virtual Channel Payload Identifier */
u8 vcpi;
/**
* @time_slots:
* The number of timeslots allocated to this payload from the source DP Tx to
* the immediate downstream DP Rx
*/
int time_slots;
/** @pbn: The payload bandwidth for this payload */
int pbn;
/** @delete: Whether or not we intend to delete this payload during this atomic commit */
bool delete : 1;
/** @dsc_enabled: Whether or not this payload has DSC enabled */
bool dsc_enabled : 1;
/** @payload_allocation_status: The allocation status of this payload */
enum drm_dp_mst_payload_allocation payload_allocation_status;
/** @next: The list node for this payload */
struct list_head next;
};
/**
* struct drm_dp_mst_topology_state - DisplayPort MST topology atomic state
*
* This struct represents the atomic state of the toplevel DisplayPort MST manager
*/
struct drm_dp_mst_topology_state {
/** @base: Base private state for atomic */
struct drm_private_state base;
/** @mgr: The topology manager */
struct drm_dp_mst_topology_mgr *mgr;
/**
* @pending_crtc_mask: A bitmask of all CRTCs this topology state touches, drivers may
* modify this to add additional dependencies if needed.
*/
u32 pending_crtc_mask;
/**
* @commit_deps: A list of all CRTC commits affecting this topology, this field isn't
* populated until drm_dp_mst_atomic_wait_for_dependencies() is called.
*/
struct drm_crtc_commit **commit_deps;
/** @num_commit_deps: The number of CRTC commits in @commit_deps */
size_t num_commit_deps;
/** @payload_mask: A bitmask of allocated VCPIs, used for VCPI assignments */
u32 payload_mask;
/** @payloads: The list of payloads being created/destroyed in this state */
struct list_head payloads;
/** @total_avail_slots: The total number of slots this topology can handle (63 or 64) */
u8 total_avail_slots;
/** @start_slot: The first usable time slot in this topology (1 or 0) */
u8 start_slot;
/**
* @pbn_div: The current PBN divisor for this topology. The driver is expected to fill this
* out itself.
*/
fixed20_12 pbn_div;
};
#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;
/**
* @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;
/**
* @payload_count: The number of currently active payloads in hardware. This value is only
* intended to be used internally by MST helpers for payload tracking, and is only safe to
* read/write from the atomic commit (not check) context.
*/
u8 payload_count;
/**
* @next_start_slot: The starting timeslot to use for new VC payloads. This value is used
* internally by MST helpers for payload tracking, and is only safe to read/write from the
* atomic commit (not check) context.
*/
u8 next_start_slot;
/**
* @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;
/**
* @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;
/**
* @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 conn_base_id);
void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
/**
* enum drm_dp_mst_mode - sink's MST mode capability
*/
enum drm_dp_mst_mode {
/**
* @DRM_DP_SST: The sink does not support MST nor single stream sideband
* messaging.
*/
DRM_DP_SST,
/**
* @DRM_DP_MST: Sink supports MST, more than one stream and single
* stream sideband messaging.
*/
DRM_DP_MST,
/**
* @DRM_DP_SST_SIDEBAND_MSG: Sink supports only one stream and single
* stream sideband messaging.
*/
DRM_DP_SST_SIDEBAND_MSG,
};
enum drm_dp_mst_mode 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_handle_event(struct drm_dp_mst_topology_mgr *mgr,
const u8 *esi,
u8 *ack,
bool *handled);
void drm_dp_mst_hpd_irq_send_new_request(struct drm_dp_mst_topology_mgr *mgr);
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);
const struct drm_edid *drm_dp_mst_edid_read(struct drm_connector *connector,
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);
fixed20_12 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);
void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap);
int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_topology_state *mst_state,
struct drm_dp_mst_atomic_payload *payload);
int drm_dp_add_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_atomic_payload *payload);
void drm_dp_remove_payload_part1(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_topology_state *mst_state,
struct drm_dp_mst_atomic_payload *payload);
void drm_dp_remove_payload_part2(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_topology_state *mst_state,
const struct drm_dp_mst_atomic_payload *old_payload,
struct drm_dp_mst_atomic_payload *new_payload);
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_queue_probe(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);
struct drm_dp_mst_topology_state *
drm_atomic_get_old_mst_topology_state(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr);
struct drm_dp_mst_topology_state *
drm_atomic_get_new_mst_topology_state(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr);
struct drm_dp_mst_atomic_payload *
drm_atomic_get_mst_payload_state(struct drm_dp_mst_topology_state *state,
struct drm_dp_mst_port *port);
bool drm_dp_mst_port_downstream_of_parent(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port,
struct drm_dp_mst_port *parent);
int __must_check
drm_dp_atomic_find_time_slots(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port, int pbn);
int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
struct drm_dp_mst_port *port,
int pbn, 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_time_slots(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port);
void drm_dp_mst_atomic_wait_for_dependencies(struct drm_atomic_state *state);
int __must_check drm_dp_mst_atomic_setup_commit(struct drm_atomic_state *state);
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_mgr(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_topology_state *mst_state,
struct drm_dp_mst_port **failing_port);
int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
int __must_check drm_dp_mst_root_conn_atomic_check(struct drm_connector_state *new_conn_state,
struct drm_dp_mst_topology_mgr *mgr);
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);
static inline
bool drm_dp_mst_port_is_logical(struct drm_dp_mst_port *port)
{
return port->port_num >= DP_MST_LOGICAL_PORT_0;
}
struct drm_dp_aux *drm_dp_mst_aux_for_parent(struct drm_dp_mst_port *port);
struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port);
static inline struct drm_dp_mst_topology_state *
to_drm_dp_mst_topology_state(struct drm_private_state *state)
{
return container_of(state, struct drm_dp_mst_topology_state, base);
}
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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