512 lines
14 KiB
C
512 lines
14 KiB
C
/*
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* Copyright © 2014 Red Hat.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#ifndef _DRM_DP_MST_HELPER_H_
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#define _DRM_DP_MST_HELPER_H_
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#include <linux/types.h>
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#include <drm/drm_dp_helper.h>
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struct drm_dp_mst_branch;
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/**
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* struct drm_dp_vcpi - Virtual Channel Payload Identifer
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* @vcpi: Virtual channel ID.
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* @pbn: Payload Bandwidth Number for this channel
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* @aligned_pbn: PBN aligned with slot size
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* @num_slots: number of slots for this PBN
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*/
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struct drm_dp_vcpi {
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int vcpi;
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int pbn;
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int aligned_pbn;
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int num_slots;
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};
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/**
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* struct drm_dp_mst_port - MST port
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* @kref: reference count for this port.
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* @guid_valid: for DP 1.2 devices if we have validated the GUID.
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* @guid: guid for DP 1.2 device on this port.
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* @port_num: port number
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* @input: if this port is an input port.
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* @mcs: message capability status - DP 1.2 spec.
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* @ddps: DisplayPort Device Plug Status - DP 1.2
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* @pdt: Peer Device Type
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* @ldps: Legacy Device Plug Status
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* @dpcd_rev: DPCD revision of device on this port
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* @num_sdp_streams: Number of simultaneous streams
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* @num_sdp_stream_sinks: Number of stream sinks
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* @available_pbn: Available bandwidth for this port.
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* @next: link to next port on this branch device
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* @mstb: branch device attach below this port
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* @aux: i2c aux transport to talk to device connected to this port.
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* @parent: branch device parent of this port
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* @vcpi: Virtual Channel Payload info for this port.
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* @connector: DRM connector this port is connected to.
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* @mgr: topology manager this port lives under.
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*
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* This structure represents an MST port endpoint on a device somewhere
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* in the MST topology.
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*/
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struct drm_dp_mst_port {
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struct kref kref;
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/* if dpcd 1.2 device is on this port - its GUID info */
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bool guid_valid;
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u8 guid[16];
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u8 port_num;
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bool input;
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bool mcs;
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bool ddps;
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u8 pdt;
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bool ldps;
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u8 dpcd_rev;
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u8 num_sdp_streams;
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u8 num_sdp_stream_sinks;
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uint16_t available_pbn;
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struct list_head next;
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struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
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struct drm_dp_aux aux; /* i2c bus for this port? */
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struct drm_dp_mst_branch *parent;
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struct drm_dp_vcpi vcpi;
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struct drm_connector *connector;
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struct drm_dp_mst_topology_mgr *mgr;
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};
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/**
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* struct drm_dp_mst_branch - MST branch device.
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* @kref: reference count for this port.
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* @rad: Relative Address to talk to this branch device.
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* @lct: Link count total to talk to this branch device.
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* @num_ports: number of ports on the branch.
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* @msg_slots: one bit per transmitted msg slot.
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* @ports: linked list of ports on this branch.
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* @port_parent: pointer to the port parent, NULL if toplevel.
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* @mgr: topology manager for this branch device.
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* @tx_slots: transmission slots for this device.
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* @last_seqno: last sequence number used to talk to this.
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* @link_address_sent: if a link address message has been sent to this device yet.
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*
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* This structure represents an MST branch device, there is one
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* primary branch device at the root, along with any others connected
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* to downstream ports
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*/
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struct drm_dp_mst_branch {
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struct kref kref;
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u8 rad[8];
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u8 lct;
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int num_ports;
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int msg_slots;
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struct list_head ports;
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/* list of tx ops queue for this port */
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struct drm_dp_mst_port *port_parent;
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struct drm_dp_mst_topology_mgr *mgr;
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/* slots are protected by mstb->mgr->qlock */
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struct drm_dp_sideband_msg_tx *tx_slots[2];
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int last_seqno;
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bool link_address_sent;
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};
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/* sideband msg header - not bit struct */
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struct drm_dp_sideband_msg_hdr {
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u8 lct;
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u8 lcr;
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u8 rad[8];
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bool broadcast;
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bool path_msg;
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u8 msg_len;
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bool somt;
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bool eomt;
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bool seqno;
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};
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struct drm_dp_nak_reply {
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u8 guid[16];
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u8 reason;
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u8 nak_data;
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};
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struct drm_dp_link_address_ack_reply {
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u8 guid[16];
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u8 nports;
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struct drm_dp_link_addr_reply_port {
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bool input_port;
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u8 peer_device_type;
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u8 port_number;
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bool mcs;
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bool ddps;
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bool legacy_device_plug_status;
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u8 dpcd_revision;
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u8 peer_guid[16];
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u8 num_sdp_streams;
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u8 num_sdp_stream_sinks;
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} ports[16];
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};
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struct drm_dp_remote_dpcd_read_ack_reply {
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u8 port_number;
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u8 num_bytes;
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u8 bytes[255];
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};
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struct drm_dp_remote_dpcd_write_ack_reply {
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u8 port_number;
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};
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struct drm_dp_remote_dpcd_write_nak_reply {
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u8 port_number;
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u8 reason;
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u8 bytes_written_before_failure;
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};
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struct drm_dp_remote_i2c_read_ack_reply {
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u8 port_number;
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u8 num_bytes;
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u8 bytes[255];
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};
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struct drm_dp_remote_i2c_read_nak_reply {
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u8 port_number;
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u8 nak_reason;
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u8 i2c_nak_transaction;
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};
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struct drm_dp_remote_i2c_write_ack_reply {
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u8 port_number;
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};
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struct drm_dp_sideband_msg_rx {
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u8 chunk[48];
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u8 msg[256];
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u8 curchunk_len;
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u8 curchunk_idx; /* chunk we are parsing now */
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u8 curchunk_hdrlen;
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u8 curlen; /* total length of the msg */
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bool have_somt;
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bool have_eomt;
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struct drm_dp_sideband_msg_hdr initial_hdr;
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};
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struct drm_dp_allocate_payload {
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u8 port_number;
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u8 number_sdp_streams;
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u8 vcpi;
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u16 pbn;
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u8 sdp_stream_sink[8];
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};
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struct drm_dp_allocate_payload_ack_reply {
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u8 port_number;
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u8 vcpi;
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u16 allocated_pbn;
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};
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struct drm_dp_connection_status_notify {
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u8 guid[16];
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u8 port_number;
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bool legacy_device_plug_status;
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bool displayport_device_plug_status;
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bool message_capability_status;
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bool input_port;
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u8 peer_device_type;
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};
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struct drm_dp_remote_dpcd_read {
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u8 port_number;
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u32 dpcd_address;
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u8 num_bytes;
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};
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struct drm_dp_remote_dpcd_write {
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u8 port_number;
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u32 dpcd_address;
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u8 num_bytes;
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u8 *bytes;
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};
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struct drm_dp_remote_i2c_read {
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u8 num_transactions;
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u8 port_number;
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struct {
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u8 i2c_dev_id;
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u8 num_bytes;
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u8 *bytes;
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u8 no_stop_bit;
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u8 i2c_transaction_delay;
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} transactions[4];
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u8 read_i2c_device_id;
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u8 num_bytes_read;
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};
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struct drm_dp_remote_i2c_write {
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u8 port_number;
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u8 write_i2c_device_id;
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u8 num_bytes;
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u8 *bytes;
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};
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/* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
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struct drm_dp_port_number_req {
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u8 port_number;
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};
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struct drm_dp_enum_path_resources_ack_reply {
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u8 port_number;
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u16 full_payload_bw_number;
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u16 avail_payload_bw_number;
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};
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/* covers POWER_DOWN_PHY, POWER_UP_PHY */
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struct drm_dp_port_number_rep {
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u8 port_number;
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};
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struct drm_dp_query_payload {
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u8 port_number;
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u8 vcpi;
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};
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struct drm_dp_resource_status_notify {
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u8 port_number;
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u8 guid[16];
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u16 available_pbn;
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};
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struct drm_dp_query_payload_ack_reply {
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u8 port_number;
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u8 allocated_pbn;
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};
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struct drm_dp_sideband_msg_req_body {
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u8 req_type;
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union ack_req {
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struct drm_dp_connection_status_notify conn_stat;
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struct drm_dp_port_number_req port_num;
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struct drm_dp_resource_status_notify resource_stat;
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struct drm_dp_query_payload query_payload;
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struct drm_dp_allocate_payload allocate_payload;
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struct drm_dp_remote_dpcd_read dpcd_read;
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struct drm_dp_remote_dpcd_write dpcd_write;
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struct drm_dp_remote_i2c_read i2c_read;
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struct drm_dp_remote_i2c_write i2c_write;
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} u;
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};
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struct drm_dp_sideband_msg_reply_body {
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u8 reply_type;
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u8 req_type;
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union ack_replies {
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struct drm_dp_nak_reply nak;
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struct drm_dp_link_address_ack_reply link_addr;
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struct drm_dp_port_number_rep port_number;
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struct drm_dp_enum_path_resources_ack_reply path_resources;
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struct drm_dp_allocate_payload_ack_reply allocate_payload;
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struct drm_dp_query_payload_ack_reply query_payload;
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struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
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struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
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struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
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struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
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struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
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struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
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} u;
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};
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/* msg is queued to be put into a slot */
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#define DRM_DP_SIDEBAND_TX_QUEUED 0
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/* msg has started transmitting on a slot - still on msgq */
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#define DRM_DP_SIDEBAND_TX_START_SEND 1
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/* msg has finished transmitting on a slot - removed from msgq only in slot */
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#define DRM_DP_SIDEBAND_TX_SENT 2
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/* msg has received a response - removed from slot */
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#define DRM_DP_SIDEBAND_TX_RX 3
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#define DRM_DP_SIDEBAND_TX_TIMEOUT 4
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struct drm_dp_sideband_msg_tx {
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u8 msg[256];
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u8 chunk[48];
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u8 cur_offset;
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u8 cur_len;
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struct drm_dp_mst_branch *dst;
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struct list_head next;
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int seqno;
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int state;
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bool path_msg;
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struct drm_dp_sideband_msg_reply_body reply;
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};
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/* sideband msg handler */
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struct drm_dp_mst_topology_mgr;
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struct drm_dp_mst_topology_cbs {
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/* create a connector for a port */
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struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *path);
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void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
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struct drm_connector *connector);
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void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
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};
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#define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
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#define DP_PAYLOAD_LOCAL 1
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#define DP_PAYLOAD_REMOTE 2
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#define DP_PAYLOAD_DELETE_LOCAL 3
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struct drm_dp_payload {
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int payload_state;
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int start_slot;
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int num_slots;
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int vcpi;
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};
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/**
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* struct drm_dp_mst_topology_mgr - DisplayPort MST manager
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* @dev: device pointer for adding i2c devices etc.
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* @cbs: callbacks for connector addition and destruction.
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* @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
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* @aux: aux channel for the DP connector.
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* @max_payloads: maximum number of payloads the GPU can generate.
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* @conn_base_id: DRM connector ID this mgr is connected to.
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* @down_rep_recv: msg receiver state for down replies.
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* @up_req_recv: msg receiver state for up requests.
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* @lock: protects mst state, primary, guid, dpcd.
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* @mst_state: if this manager is enabled for an MST capable port.
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* @mst_primary: pointer to the primary branch device.
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* @guid_valid: GUID valid for the primary branch device.
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* @guid: GUID for primary port.
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* @dpcd: cache of DPCD for primary port.
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* @pbn_div: PBN to slots divisor.
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*
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* This struct represents the toplevel displayport MST topology manager.
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* There should be one instance of this for every MST capable DP connector
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* on the GPU.
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*/
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struct drm_dp_mst_topology_mgr {
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struct device *dev;
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struct drm_dp_mst_topology_cbs *cbs;
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int max_dpcd_transaction_bytes;
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struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
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int max_payloads;
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int conn_base_id;
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/* only ever accessed from the workqueue - which should be serialised */
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struct drm_dp_sideband_msg_rx down_rep_recv;
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struct drm_dp_sideband_msg_rx up_req_recv;
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/* pointer to info about the initial MST device */
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struct mutex lock; /* protects mst_state + primary + guid + dpcd */
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bool mst_state;
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struct drm_dp_mst_branch *mst_primary;
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/* primary MST device GUID */
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bool guid_valid;
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u8 guid[16];
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u8 dpcd[DP_RECEIVER_CAP_SIZE];
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u8 sink_count;
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int pbn_div;
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int total_slots;
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int avail_slots;
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int total_pbn;
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/* messages to be transmitted */
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/* qlock protects the upq/downq and in_progress,
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the mstb tx_slots and txmsg->state once they are queued */
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struct mutex qlock;
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struct list_head tx_msg_downq;
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struct list_head tx_msg_upq;
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bool tx_down_in_progress;
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bool tx_up_in_progress;
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/* payload info + lock for it */
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struct mutex payload_lock;
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struct drm_dp_vcpi **proposed_vcpis;
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struct drm_dp_payload *payloads;
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unsigned long payload_mask;
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unsigned long vcpi_mask;
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wait_queue_head_t tx_waitq;
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struct work_struct work;
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struct work_struct tx_work;
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};
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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);
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void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
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int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
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int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
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enum drm_connector_status drm_dp_mst_detect_port(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
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struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
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int drm_dp_calc_pbn_mode(int clock, int bpp);
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bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
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void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
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void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
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struct drm_dp_mst_port *port);
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int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
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int pbn);
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int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
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int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
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int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
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void drm_dp_mst_dump_topology(struct seq_file *m,
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struct drm_dp_mst_topology_mgr *mgr);
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void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
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int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
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#endif
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