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5056 | serge | 1 | /* |
2 | * Copyright © 2014 Red Hat. |
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3 | * |
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4 | * Permission to use, copy, modify, distribute, and sell this software and its |
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5 | * documentation for any purpose is hereby granted without fee, provided that |
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6 | * the above copyright notice appear in all copies and that both that copyright |
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7 | * notice and this permission notice appear in supporting documentation, and |
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8 | * that the name of the copyright holders not be used in advertising or |
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9 | * publicity pertaining to distribution of the software without specific, |
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10 | * written prior permission. The copyright holders make no representations |
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11 | * about the suitability of this software for any purpose. It is provided "as |
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12 | * is" without express or implied warranty. |
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13 | * |
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14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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20 | * OF THIS SOFTWARE. |
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21 | */ |
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22 | #ifndef _DRM_DP_MST_HELPER_H_ |
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23 | #define _DRM_DP_MST_HELPER_H_ |
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24 | |||
25 | #include |
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26 | #include |
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27 | |||
28 | struct drm_dp_mst_branch; |
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29 | |||
30 | /** |
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5270 | serge | 31 | * struct drm_dp_vcpi - Virtual Channel Payload Identifier |
5056 | serge | 32 | * @vcpi: Virtual channel ID. |
33 | * @pbn: Payload Bandwidth Number for this channel |
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34 | * @aligned_pbn: PBN aligned with slot size |
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35 | * @num_slots: number of slots for this PBN |
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36 | */ |
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37 | struct drm_dp_vcpi { |
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38 | int vcpi; |
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39 | int pbn; |
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40 | int aligned_pbn; |
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41 | int num_slots; |
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42 | }; |
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43 | |||
44 | /** |
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45 | * struct drm_dp_mst_port - MST port |
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46 | * @kref: reference count for this port. |
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47 | * @port_num: port number |
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48 | * @input: if this port is an input port. |
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49 | * @mcs: message capability status - DP 1.2 spec. |
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50 | * @ddps: DisplayPort Device Plug Status - DP 1.2 |
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51 | * @pdt: Peer Device Type |
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52 | * @ldps: Legacy Device Plug Status |
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53 | * @dpcd_rev: DPCD revision of device on this port |
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54 | * @num_sdp_streams: Number of simultaneous streams |
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55 | * @num_sdp_stream_sinks: Number of stream sinks |
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56 | * @available_pbn: Available bandwidth for this port. |
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57 | * @next: link to next port on this branch device |
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58 | * @mstb: branch device attach below this port |
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59 | * @aux: i2c aux transport to talk to device connected to this port. |
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60 | * @parent: branch device parent of this port |
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61 | * @vcpi: Virtual Channel Payload info for this port. |
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62 | * @connector: DRM connector this port is connected to. |
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63 | * @mgr: topology manager this port lives under. |
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64 | * |
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65 | * This structure represents an MST port endpoint on a device somewhere |
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66 | * in the MST topology. |
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67 | */ |
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68 | struct drm_dp_mst_port { |
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69 | struct kref kref; |
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70 | |||
71 | u8 port_num; |
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72 | bool input; |
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73 | bool mcs; |
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74 | bool ddps; |
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75 | u8 pdt; |
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76 | bool ldps; |
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77 | u8 dpcd_rev; |
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78 | u8 num_sdp_streams; |
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79 | u8 num_sdp_stream_sinks; |
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80 | uint16_t available_pbn; |
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81 | struct list_head next; |
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82 | struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */ |
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83 | struct drm_dp_aux aux; /* i2c bus for this port? */ |
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84 | struct drm_dp_mst_branch *parent; |
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85 | |||
86 | struct drm_dp_vcpi vcpi; |
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87 | struct drm_connector *connector; |
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88 | struct drm_dp_mst_topology_mgr *mgr; |
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5270 | serge | 89 | |
90 | struct edid *cached_edid; /* for DP logical ports - make tiling work */ |
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5056 | serge | 91 | }; |
92 | |||
93 | /** |
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94 | * struct drm_dp_mst_branch - MST branch device. |
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95 | * @kref: reference count for this port. |
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96 | * @rad: Relative Address to talk to this branch device. |
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97 | * @lct: Link count total to talk to this branch device. |
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98 | * @num_ports: number of ports on the branch. |
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99 | * @msg_slots: one bit per transmitted msg slot. |
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100 | * @ports: linked list of ports on this branch. |
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101 | * @port_parent: pointer to the port parent, NULL if toplevel. |
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102 | * @mgr: topology manager for this branch device. |
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103 | * @tx_slots: transmission slots for this device. |
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104 | * @last_seqno: last sequence number used to talk to this. |
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105 | * @link_address_sent: if a link address message has been sent to this device yet. |
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6336 | serge | 106 | * @guid: guid for DP 1.2 branch device. port under this branch can be |
107 | * identified by port #. |
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5056 | serge | 108 | * |
109 | * This structure represents an MST branch device, there is one |
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6336 | serge | 110 | * primary branch device at the root, along with any other branches connected |
111 | * to downstream port of parent branches. |
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5056 | serge | 112 | */ |
113 | struct drm_dp_mst_branch { |
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114 | struct kref kref; |
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115 | u8 rad[8]; |
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116 | u8 lct; |
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117 | int num_ports; |
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118 | |||
119 | int msg_slots; |
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120 | struct list_head ports; |
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121 | |||
122 | /* list of tx ops queue for this port */ |
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123 | struct drm_dp_mst_port *port_parent; |
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124 | struct drm_dp_mst_topology_mgr *mgr; |
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125 | |||
126 | /* slots are protected by mstb->mgr->qlock */ |
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127 | struct drm_dp_sideband_msg_tx *tx_slots[2]; |
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128 | int last_seqno; |
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129 | bool link_address_sent; |
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6336 | serge | 130 | |
131 | /* global unique identifier to identify branch devices */ |
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132 | u8 guid[16]; |
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5056 | serge | 133 | }; |
134 | |||
135 | |||
136 | /* sideband msg header - not bit struct */ |
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137 | struct drm_dp_sideband_msg_hdr { |
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138 | u8 lct; |
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139 | u8 lcr; |
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140 | u8 rad[8]; |
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141 | bool broadcast; |
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142 | bool path_msg; |
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143 | u8 msg_len; |
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144 | bool somt; |
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145 | bool eomt; |
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146 | bool seqno; |
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147 | }; |
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148 | |||
149 | struct drm_dp_nak_reply { |
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150 | u8 guid[16]; |
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151 | u8 reason; |
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152 | u8 nak_data; |
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153 | }; |
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154 | |||
155 | struct drm_dp_link_address_ack_reply { |
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156 | u8 guid[16]; |
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157 | u8 nports; |
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158 | struct drm_dp_link_addr_reply_port { |
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159 | bool input_port; |
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160 | u8 peer_device_type; |
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161 | u8 port_number; |
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162 | bool mcs; |
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163 | bool ddps; |
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164 | bool legacy_device_plug_status; |
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165 | u8 dpcd_revision; |
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166 | u8 peer_guid[16]; |
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167 | u8 num_sdp_streams; |
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168 | u8 num_sdp_stream_sinks; |
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169 | } ports[16]; |
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170 | }; |
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171 | |||
172 | struct drm_dp_remote_dpcd_read_ack_reply { |
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173 | u8 port_number; |
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174 | u8 num_bytes; |
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175 | u8 bytes[255]; |
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176 | }; |
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177 | |||
178 | struct drm_dp_remote_dpcd_write_ack_reply { |
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179 | u8 port_number; |
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180 | }; |
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181 | |||
182 | struct drm_dp_remote_dpcd_write_nak_reply { |
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183 | u8 port_number; |
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184 | u8 reason; |
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185 | u8 bytes_written_before_failure; |
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186 | }; |
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187 | |||
188 | struct drm_dp_remote_i2c_read_ack_reply { |
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189 | u8 port_number; |
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190 | u8 num_bytes; |
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191 | u8 bytes[255]; |
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192 | }; |
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193 | |||
194 | struct drm_dp_remote_i2c_read_nak_reply { |
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195 | u8 port_number; |
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196 | u8 nak_reason; |
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197 | u8 i2c_nak_transaction; |
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198 | }; |
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199 | |||
200 | struct drm_dp_remote_i2c_write_ack_reply { |
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201 | u8 port_number; |
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202 | }; |
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203 | |||
204 | |||
205 | struct drm_dp_sideband_msg_rx { |
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206 | u8 chunk[48]; |
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207 | u8 msg[256]; |
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208 | u8 curchunk_len; |
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209 | u8 curchunk_idx; /* chunk we are parsing now */ |
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210 | u8 curchunk_hdrlen; |
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211 | u8 curlen; /* total length of the msg */ |
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212 | bool have_somt; |
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213 | bool have_eomt; |
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214 | struct drm_dp_sideband_msg_hdr initial_hdr; |
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215 | }; |
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216 | |||
217 | |||
218 | struct drm_dp_allocate_payload { |
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219 | u8 port_number; |
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220 | u8 number_sdp_streams; |
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221 | u8 vcpi; |
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222 | u16 pbn; |
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223 | u8 sdp_stream_sink[8]; |
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224 | }; |
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225 | |||
226 | struct drm_dp_allocate_payload_ack_reply { |
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227 | u8 port_number; |
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228 | u8 vcpi; |
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229 | u16 allocated_pbn; |
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230 | }; |
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231 | |||
232 | struct drm_dp_connection_status_notify { |
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233 | u8 guid[16]; |
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234 | u8 port_number; |
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235 | bool legacy_device_plug_status; |
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236 | bool displayport_device_plug_status; |
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237 | bool message_capability_status; |
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238 | bool input_port; |
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239 | u8 peer_device_type; |
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240 | }; |
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241 | |||
242 | struct drm_dp_remote_dpcd_read { |
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243 | u8 port_number; |
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244 | u32 dpcd_address; |
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245 | u8 num_bytes; |
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246 | }; |
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247 | |||
248 | struct drm_dp_remote_dpcd_write { |
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249 | u8 port_number; |
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250 | u32 dpcd_address; |
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251 | u8 num_bytes; |
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252 | u8 *bytes; |
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253 | }; |
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254 | |||
6082 | serge | 255 | #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4 |
5056 | serge | 256 | struct drm_dp_remote_i2c_read { |
257 | u8 num_transactions; |
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258 | u8 port_number; |
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259 | struct { |
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260 | u8 i2c_dev_id; |
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261 | u8 num_bytes; |
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262 | u8 *bytes; |
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263 | u8 no_stop_bit; |
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264 | u8 i2c_transaction_delay; |
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6082 | serge | 265 | } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS]; |
5056 | serge | 266 | u8 read_i2c_device_id; |
267 | u8 num_bytes_read; |
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268 | }; |
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269 | |||
270 | struct drm_dp_remote_i2c_write { |
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271 | u8 port_number; |
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272 | u8 write_i2c_device_id; |
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273 | u8 num_bytes; |
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274 | u8 *bytes; |
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275 | }; |
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276 | |||
277 | /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */ |
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278 | struct drm_dp_port_number_req { |
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279 | u8 port_number; |
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280 | }; |
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281 | |||
282 | struct drm_dp_enum_path_resources_ack_reply { |
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283 | u8 port_number; |
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284 | u16 full_payload_bw_number; |
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285 | u16 avail_payload_bw_number; |
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286 | }; |
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287 | |||
288 | /* covers POWER_DOWN_PHY, POWER_UP_PHY */ |
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289 | struct drm_dp_port_number_rep { |
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290 | u8 port_number; |
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291 | }; |
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292 | |||
293 | struct drm_dp_query_payload { |
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294 | u8 port_number; |
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295 | u8 vcpi; |
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296 | }; |
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297 | |||
298 | struct drm_dp_resource_status_notify { |
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299 | u8 port_number; |
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300 | u8 guid[16]; |
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301 | u16 available_pbn; |
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302 | }; |
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303 | |||
304 | struct drm_dp_query_payload_ack_reply { |
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305 | u8 port_number; |
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306 | u8 allocated_pbn; |
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307 | }; |
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308 | |||
309 | struct drm_dp_sideband_msg_req_body { |
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310 | u8 req_type; |
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311 | union ack_req { |
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312 | struct drm_dp_connection_status_notify conn_stat; |
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313 | struct drm_dp_port_number_req port_num; |
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314 | struct drm_dp_resource_status_notify resource_stat; |
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315 | |||
316 | struct drm_dp_query_payload query_payload; |
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317 | struct drm_dp_allocate_payload allocate_payload; |
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318 | |||
319 | struct drm_dp_remote_dpcd_read dpcd_read; |
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320 | struct drm_dp_remote_dpcd_write dpcd_write; |
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321 | |||
322 | struct drm_dp_remote_i2c_read i2c_read; |
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323 | struct drm_dp_remote_i2c_write i2c_write; |
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324 | } u; |
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325 | }; |
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326 | |||
327 | struct drm_dp_sideband_msg_reply_body { |
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328 | u8 reply_type; |
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329 | u8 req_type; |
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330 | union ack_replies { |
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331 | struct drm_dp_nak_reply nak; |
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332 | struct drm_dp_link_address_ack_reply link_addr; |
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333 | struct drm_dp_port_number_rep port_number; |
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334 | |||
335 | struct drm_dp_enum_path_resources_ack_reply path_resources; |
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336 | struct drm_dp_allocate_payload_ack_reply allocate_payload; |
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337 | struct drm_dp_query_payload_ack_reply query_payload; |
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338 | |||
339 | struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack; |
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340 | struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack; |
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341 | struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack; |
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342 | |||
343 | struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack; |
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344 | struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack; |
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345 | struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack; |
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346 | } u; |
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347 | }; |
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348 | |||
349 | /* msg is queued to be put into a slot */ |
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350 | #define DRM_DP_SIDEBAND_TX_QUEUED 0 |
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351 | /* msg has started transmitting on a slot - still on msgq */ |
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352 | #define DRM_DP_SIDEBAND_TX_START_SEND 1 |
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353 | /* msg has finished transmitting on a slot - removed from msgq only in slot */ |
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354 | #define DRM_DP_SIDEBAND_TX_SENT 2 |
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355 | /* msg has received a response - removed from slot */ |
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356 | #define DRM_DP_SIDEBAND_TX_RX 3 |
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357 | #define DRM_DP_SIDEBAND_TX_TIMEOUT 4 |
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358 | |||
359 | struct drm_dp_sideband_msg_tx { |
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360 | u8 msg[256]; |
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361 | u8 chunk[48]; |
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362 | u8 cur_offset; |
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363 | u8 cur_len; |
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364 | struct drm_dp_mst_branch *dst; |
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365 | struct list_head next; |
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366 | int seqno; |
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367 | int state; |
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368 | bool path_msg; |
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369 | struct drm_dp_sideband_msg_reply_body reply; |
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370 | }; |
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371 | |||
372 | /* sideband msg handler */ |
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373 | struct drm_dp_mst_topology_mgr; |
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374 | struct drm_dp_mst_topology_cbs { |
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375 | /* create a connector for a port */ |
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5270 | serge | 376 | struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path); |
6082 | serge | 377 | void (*register_connector)(struct drm_connector *connector); |
5056 | serge | 378 | void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr, |
379 | struct drm_connector *connector); |
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380 | void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr); |
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381 | |||
382 | }; |
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383 | |||
384 | #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) |
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385 | |||
386 | #define DP_PAYLOAD_LOCAL 1 |
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387 | #define DP_PAYLOAD_REMOTE 2 |
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388 | #define DP_PAYLOAD_DELETE_LOCAL 3 |
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389 | |||
390 | struct drm_dp_payload { |
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391 | int payload_state; |
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392 | int start_slot; |
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393 | int num_slots; |
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5270 | serge | 394 | int vcpi; |
5056 | serge | 395 | }; |
396 | |||
397 | /** |
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398 | * struct drm_dp_mst_topology_mgr - DisplayPort MST manager |
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399 | * @dev: device pointer for adding i2c devices etc. |
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400 | * @cbs: callbacks for connector addition and destruction. |
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401 | * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go. |
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402 | * @aux: aux channel for the DP connector. |
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403 | * @max_payloads: maximum number of payloads the GPU can generate. |
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404 | * @conn_base_id: DRM connector ID this mgr is connected to. |
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405 | * @down_rep_recv: msg receiver state for down replies. |
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406 | * @up_req_recv: msg receiver state for up requests. |
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6336 | serge | 407 | * @lock: protects mst state, primary, dpcd. |
5056 | serge | 408 | * @mst_state: if this manager is enabled for an MST capable port. |
409 | * @mst_primary: pointer to the primary branch device. |
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410 | * @dpcd: cache of DPCD for primary port. |
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411 | * @pbn_div: PBN to slots divisor. |
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412 | * |
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413 | * This struct represents the toplevel displayport MST topology manager. |
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414 | * There should be one instance of this for every MST capable DP connector |
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415 | * on the GPU. |
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416 | */ |
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417 | struct drm_dp_mst_topology_mgr { |
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418 | |||
419 | struct device *dev; |
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420 | struct drm_dp_mst_topology_cbs *cbs; |
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421 | int max_dpcd_transaction_bytes; |
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422 | struct drm_dp_aux *aux; /* auxch for this topology mgr to use */ |
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423 | int max_payloads; |
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424 | int conn_base_id; |
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425 | |||
426 | /* only ever accessed from the workqueue - which should be serialised */ |
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427 | struct drm_dp_sideband_msg_rx down_rep_recv; |
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428 | struct drm_dp_sideband_msg_rx up_req_recv; |
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429 | |||
430 | /* pointer to info about the initial MST device */ |
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6336 | serge | 431 | struct mutex lock; /* protects mst_state + primary + dpcd */ |
5056 | serge | 432 | |
433 | bool mst_state; |
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434 | struct drm_dp_mst_branch *mst_primary; |
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6336 | serge | 435 | |
5056 | serge | 436 | u8 dpcd[DP_RECEIVER_CAP_SIZE]; |
437 | u8 sink_count; |
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438 | int pbn_div; |
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439 | int total_slots; |
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440 | int avail_slots; |
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441 | int total_pbn; |
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442 | |||
443 | /* messages to be transmitted */ |
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444 | /* qlock protects the upq/downq and in_progress, |
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445 | the mstb tx_slots and txmsg->state once they are queued */ |
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6082 | serge | 446 | struct mutex qlock; |
5056 | serge | 447 | struct list_head tx_msg_downq; |
448 | bool tx_down_in_progress; |
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449 | |||
450 | /* payload info + lock for it */ |
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451 | struct mutex payload_lock; |
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452 | struct drm_dp_vcpi **proposed_vcpis; |
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453 | struct drm_dp_payload *payloads; |
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454 | unsigned long payload_mask; |
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5270 | serge | 455 | unsigned long vcpi_mask; |
5056 | serge | 456 | |
457 | wait_queue_head_t tx_waitq; |
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458 | struct work_struct work; |
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459 | |||
460 | struct work_struct tx_work; |
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6082 | serge | 461 | |
462 | struct list_head destroy_connector_list; |
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463 | struct mutex destroy_connector_lock; |
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464 | struct work_struct destroy_connector_work; |
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5056 | serge | 465 | }; |
466 | |||
467 | 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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468 | |||
469 | void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); |
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470 | |||
471 | |||
472 | int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state); |
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473 | |||
474 | |||
475 | int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled); |
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476 | |||
477 | |||
5270 | serge | 478 | 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); |
5056 | serge | 479 | |
480 | 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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481 | |||
482 | |||
483 | int drm_dp_calc_pbn_mode(int clock, int bpp); |
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484 | |||
485 | |||
486 | 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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487 | |||
6082 | serge | 488 | int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); |
5056 | serge | 489 | |
6082 | serge | 490 | |
5056 | serge | 491 | void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port); |
492 | |||
493 | |||
494 | void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, |
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495 | struct drm_dp_mst_port *port); |
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496 | |||
497 | |||
498 | int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, |
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499 | int pbn); |
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500 | |||
501 | |||
502 | int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr); |
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503 | |||
504 | |||
505 | int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr); |
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506 | |||
507 | int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr); |
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508 | |||
509 | void drm_dp_mst_dump_topology(struct seq_file *m, |
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510 | struct drm_dp_mst_topology_mgr *mgr); |
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511 | |||
512 | void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr); |
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513 | int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr); |
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514 | #endif |