1 /* $NetBSD: amdgpu_hdcp1_transition.c,v 1.2 2021/12/18 23:45:07 riastradh Exp $ */ 2 3 /* 4 * Copyright 2019 Advanced Micro Devices, Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: AMD 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: amdgpu_hdcp1_transition.c,v 1.2 2021/12/18 23:45:07 riastradh Exp $"); 30 31 #include "hdcp.h" 32 33 enum mod_hdcp_status mod_hdcp_hdcp1_transition(struct mod_hdcp *hdcp, 34 struct mod_hdcp_event_context *event_ctx, 35 struct mod_hdcp_transition_input_hdcp1 *input, 36 struct mod_hdcp_output *output) 37 { 38 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS; 39 struct mod_hdcp_connection *conn = &hdcp->connection; 40 struct mod_hdcp_link_adjustment *adjust = &hdcp->connection.link.adjust; 41 42 switch (current_state(hdcp)) { 43 case H1_A0_WAIT_FOR_ACTIVE_RX: 44 if (input->bksv_read != PASS || input->bcaps_read != PASS) { 45 /* 1A-04: repeatedly attempts on port access failure */ 46 callback_in_ms(500, output); 47 increment_stay_counter(hdcp); 48 break; 49 } 50 callback_in_ms(0, output); 51 set_state_id(hdcp, output, H1_A1_EXCHANGE_KSVS); 52 break; 53 case H1_A1_EXCHANGE_KSVS: 54 if (input->add_topology != PASS || 55 input->create_session != PASS) { 56 /* out of sync with psp state */ 57 adjust->hdcp1.disable = 1; 58 fail_and_restart_in_ms(0, &status, output); 59 break; 60 } else if (input->an_write != PASS || 61 input->aksv_write != PASS || 62 input->bksv_read != PASS || 63 input->bksv_validation != PASS || 64 input->ainfo_write == FAIL) { 65 /* 1A-05: consider invalid bksv a failure */ 66 fail_and_restart_in_ms(0, &status, output); 67 break; 68 } 69 callback_in_ms(300, output); 70 set_state_id(hdcp, output, 71 H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER); 72 break; 73 case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER: 74 if (input->bcaps_read != PASS || 75 input->r0p_read != PASS) { 76 fail_and_restart_in_ms(0, &status, output); 77 break; 78 } else if (input->rx_validation != PASS) { 79 /* 1A-06: consider invalid r0' a failure */ 80 /* 1A-08: consider bksv listed in SRM a failure */ 81 /* 82 * some slow RX will fail rx validation when it is 83 * not ready. give it more time to react before retry. 84 */ 85 fail_and_restart_in_ms(1000, &status, output); 86 break; 87 } else if (!conn->is_repeater && input->encryption != PASS) { 88 fail_and_restart_in_ms(0, &status, output); 89 break; 90 } 91 if (conn->is_repeater) { 92 callback_in_ms(0, output); 93 set_watchdog_in_ms(hdcp, 5000, output); 94 set_state_id(hdcp, output, H1_A8_WAIT_FOR_READY); 95 } else { 96 callback_in_ms(0, output); 97 set_state_id(hdcp, output, H1_A45_AUTHENTICATED); 98 HDCP_FULL_DDC_TRACE(hdcp); 99 } 100 break; 101 case H1_A45_AUTHENTICATED: 102 if (input->link_maintenance != PASS) { 103 /* 1A-07: consider invalid ri' a failure */ 104 /* 1A-07a: consider read ri' not returned a failure */ 105 fail_and_restart_in_ms(0, &status, output); 106 break; 107 } 108 callback_in_ms(500, output); 109 increment_stay_counter(hdcp); 110 break; 111 case H1_A8_WAIT_FOR_READY: 112 if (input->ready_check != PASS) { 113 if (event_ctx->event == 114 MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) { 115 /* 1B-03: fail hdcp on ksv list READY timeout */ 116 /* prevent black screen in next attempt */ 117 adjust->hdcp1.postpone_encryption = 1; 118 fail_and_restart_in_ms(0, &status, output); 119 } else { 120 /* continue ksv list READY polling*/ 121 callback_in_ms(500, output); 122 increment_stay_counter(hdcp); 123 } 124 break; 125 } 126 callback_in_ms(0, output); 127 set_state_id(hdcp, output, H1_A9_READ_KSV_LIST); 128 break; 129 case H1_A9_READ_KSV_LIST: 130 if (input->bstatus_read != PASS || 131 input->max_cascade_check != PASS || 132 input->max_devs_check != PASS || 133 input->device_count_check != PASS || 134 input->ksvlist_read != PASS || 135 input->vp_read != PASS || 136 input->ksvlist_vp_validation != PASS || 137 input->encryption != PASS) { 138 /* 1B-06: consider MAX_CASCADE_EXCEEDED a failure */ 139 /* 1B-05: consider MAX_DEVS_EXCEEDED a failure */ 140 /* 1B-04: consider invalid v' a failure */ 141 fail_and_restart_in_ms(0, &status, output); 142 break; 143 } 144 callback_in_ms(0, output); 145 set_state_id(hdcp, output, H1_A45_AUTHENTICATED); 146 HDCP_FULL_DDC_TRACE(hdcp); 147 break; 148 default: 149 status = MOD_HDCP_STATUS_INVALID_STATE; 150 fail_and_restart_in_ms(0, &status, output); 151 break; 152 } 153 154 return status; 155 } 156 157 enum mod_hdcp_status mod_hdcp_hdcp1_dp_transition(struct mod_hdcp *hdcp, 158 struct mod_hdcp_event_context *event_ctx, 159 struct mod_hdcp_transition_input_hdcp1 *input, 160 struct mod_hdcp_output *output) 161 { 162 enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS; 163 struct mod_hdcp_connection *conn = &hdcp->connection; 164 struct mod_hdcp_link_adjustment *adjust = &hdcp->connection.link.adjust; 165 166 switch (current_state(hdcp)) { 167 case D1_A0_DETERMINE_RX_HDCP_CAPABLE: 168 if (input->bcaps_read != PASS) { 169 /* 1A-04: no authentication on bcaps read failure */ 170 fail_and_restart_in_ms(0, &status, output); 171 break; 172 } else if (input->hdcp_capable_dp != PASS) { 173 adjust->hdcp1.disable = 1; 174 fail_and_restart_in_ms(0, &status, output); 175 break; 176 } 177 callback_in_ms(0, output); 178 set_state_id(hdcp, output, D1_A1_EXCHANGE_KSVS); 179 break; 180 case D1_A1_EXCHANGE_KSVS: 181 if (input->add_topology != PASS || 182 input->create_session != PASS) { 183 /* out of sync with psp state */ 184 adjust->hdcp1.disable = 1; 185 fail_and_restart_in_ms(0, &status, output); 186 break; 187 } else if (input->an_write != PASS || 188 input->aksv_write != PASS || 189 input->bksv_read != PASS || 190 input->bksv_validation != PASS || 191 input->ainfo_write == FAIL) { 192 /* 1A-05: consider invalid bksv a failure */ 193 fail_and_restart_in_ms(0, &status, output); 194 break; 195 } 196 set_watchdog_in_ms(hdcp, 100, output); 197 set_state_id(hdcp, output, D1_A23_WAIT_FOR_R0_PRIME); 198 break; 199 case D1_A23_WAIT_FOR_R0_PRIME: 200 if (input->bstatus_read != PASS) { 201 fail_and_restart_in_ms(0, &status, output); 202 break; 203 } else if (input->r0p_available_dp != PASS) { 204 if (event_ctx->event == MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) 205 fail_and_restart_in_ms(0, &status, output); 206 else 207 increment_stay_counter(hdcp); 208 break; 209 } 210 callback_in_ms(0, output); 211 set_state_id(hdcp, output, D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER); 212 break; 213 case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER: 214 if (input->r0p_read != PASS) { 215 fail_and_restart_in_ms(0, &status, output); 216 break; 217 } else if (input->rx_validation != PASS) { 218 if (hdcp->state.stay_count < 2) { 219 /* allow 2 additional retries */ 220 callback_in_ms(0, output); 221 increment_stay_counter(hdcp); 222 } else { 223 /* 224 * 1A-06: consider invalid r0' a failure 225 * after 3 attempts. 226 * 1A-08: consider bksv listed in SRM a failure 227 */ 228 /* 229 * some slow RX will fail rx validation when it is 230 * not ready. give it more time to react before retry. 231 */ 232 fail_and_restart_in_ms(1000, &status, output); 233 } 234 break; 235 } else if ((!conn->is_repeater && input->encryption != PASS) || 236 (!conn->is_repeater && is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) { 237 fail_and_restart_in_ms(0, &status, output); 238 break; 239 } 240 if (conn->is_repeater) { 241 set_watchdog_in_ms(hdcp, 5000, output); 242 set_state_id(hdcp, output, D1_A6_WAIT_FOR_READY); 243 } else { 244 set_state_id(hdcp, output, D1_A4_AUTHENTICATED); 245 HDCP_FULL_DDC_TRACE(hdcp); 246 } 247 break; 248 case D1_A4_AUTHENTICATED: 249 if (input->link_integrity_check != PASS || 250 input->reauth_request_check != PASS) { 251 /* 1A-07: restart hdcp on a link integrity failure */ 252 fail_and_restart_in_ms(0, &status, output); 253 break; 254 } 255 break; 256 case D1_A6_WAIT_FOR_READY: 257 if (input->link_integrity_check == FAIL || 258 input->reauth_request_check == FAIL) { 259 fail_and_restart_in_ms(0, &status, output); 260 break; 261 } else if (input->ready_check != PASS) { 262 if (event_ctx->event == 263 MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) { 264 /* 1B-04: fail hdcp on ksv list READY timeout */ 265 /* prevent black screen in next attempt */ 266 adjust->hdcp1.postpone_encryption = 1; 267 fail_and_restart_in_ms(0, &status, output); 268 } else { 269 increment_stay_counter(hdcp); 270 } 271 break; 272 } 273 callback_in_ms(0, output); 274 set_state_id(hdcp, output, D1_A7_READ_KSV_LIST); 275 break; 276 case D1_A7_READ_KSV_LIST: 277 if (input->binfo_read_dp != PASS || 278 input->max_cascade_check != PASS || 279 input->max_devs_check != PASS) { 280 /* 1B-06: consider MAX_DEVS_EXCEEDED a failure */ 281 /* 1B-07: consider MAX_CASCADE_EXCEEDED a failure */ 282 fail_and_restart_in_ms(0, &status, output); 283 break; 284 } else if (input->device_count_check != PASS) { 285 /* 286 * some slow dongle doesn't update 287 * device count as soon as downstream is connected. 288 * give it more time to react. 289 */ 290 adjust->hdcp1.postpone_encryption = 1; 291 fail_and_restart_in_ms(1000, &status, output); 292 break; 293 } else if (input->ksvlist_read != PASS || 294 input->vp_read != PASS) { 295 fail_and_restart_in_ms(0, &status, output); 296 break; 297 } else if (input->ksvlist_vp_validation != PASS) { 298 if (hdcp->state.stay_count < 2) { 299 /* allow 2 additional retries */ 300 callback_in_ms(0, output); 301 increment_stay_counter(hdcp); 302 } else { 303 /* 304 * 1B-05: consider invalid v' a failure 305 * after 3 attempts. 306 */ 307 fail_and_restart_in_ms(0, &status, output); 308 } 309 break; 310 } else if (input->encryption != PASS || 311 (is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) { 312 fail_and_restart_in_ms(0, &status, output); 313 break; 314 } 315 set_state_id(hdcp, output, D1_A4_AUTHENTICATED); 316 HDCP_FULL_DDC_TRACE(hdcp); 317 break; 318 default: 319 fail_and_restart_in_ms(0, &status, output); 320 break; 321 } 322 323 return status; 324 } 325
Indexes created Sat Sep 20 22:09:52 GMT 2025