1 /* 2 * Copyright © 2008 Keith Packard 3 * 4 * Permission to use, copy, modify, distribute, and sell this software and its 5 * documentation for any purpose is hereby granted without fee, provided that 6 * the above copyright notice appear in all copies and that both that copyright 7 * notice and this permission notice appear in supporting documentation, and 8 * that the name of the copyright holders not be used in advertising or 9 * publicity pertaining to distribution of the software without specific, 10 * written prior permission. The copyright holders make no representations 11 * about the suitability of this software for any purpose. It is provided "as 12 * is" without express or implied warranty. 13 * 14 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 15 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 16 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 17 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 18 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 19 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 20 * OF THIS SOFTWARE. 21 */ 22 23 #ifndef _DRM_DP_HELPER_H_ 24 #define _DRM_DP_HELPER_H_ 25 26 #include <linux/delay.h> 27 #include <linux/i2c.h> 28 29 #include <drm/display/drm_dp.h> 30 #include <drm/drm_connector.h> 31 32 struct drm_device; 33 struct drm_dp_aux; 34 struct drm_panel; 35 36 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE], 37 int lane_count); 38 bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE], 39 int lane_count); 40 u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE], 41 int lane); 42 u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE], 43 int lane); 44 u8 drm_dp_get_adjust_tx_ffe_preset(const u8 link_status[DP_LINK_STATUS_SIZE], 45 int lane); 46 47 int drm_dp_read_clock_recovery_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], 48 enum drm_dp_phy dp_phy, bool uhbr); 49 int drm_dp_read_channel_eq_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE], 50 enum drm_dp_phy dp_phy, bool uhbr); 51 52 void drm_dp_link_train_clock_recovery_delay(const struct drm_dp_aux *aux, 53 const u8 dpcd[DP_RECEIVER_CAP_SIZE]); 54 void drm_dp_lttpr_link_train_clock_recovery_delay(void); 55 void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux, 56 const u8 dpcd[DP_RECEIVER_CAP_SIZE]); 57 void drm_dp_lttpr_link_train_channel_eq_delay(const struct drm_dp_aux *aux, 58 const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 59 60 int drm_dp_128b132b_read_aux_rd_interval(struct drm_dp_aux *aux); 61 bool drm_dp_128b132b_lane_channel_eq_done(const u8 link_status[DP_LINK_STATUS_SIZE], 62 int lane_count); 63 bool drm_dp_128b132b_lane_symbol_locked(const u8 link_status[DP_LINK_STATUS_SIZE], 64 int lane_count); 65 bool drm_dp_128b132b_eq_interlane_align_done(const u8 link_status[DP_LINK_STATUS_SIZE]); 66 bool drm_dp_128b132b_cds_interlane_align_done(const u8 link_status[DP_LINK_STATUS_SIZE]); 67 bool drm_dp_128b132b_link_training_failed(const u8 link_status[DP_LINK_STATUS_SIZE]); 68 69 u8 drm_dp_link_rate_to_bw_code(int link_rate); 70 int drm_dp_bw_code_to_link_rate(u8 link_bw); 71 72 const char *drm_dp_phy_name(enum drm_dp_phy dp_phy); 73 74 /** 75 * struct drm_dp_vsc_sdp - drm DP VSC SDP 76 * 77 * This structure represents a DP VSC SDP of drm 78 * It is based on DP 1.4 spec [Table 2-116: VSC SDP Header Bytes] and 79 * [Table 2-117: VSC SDP Payload for DB16 through DB18] 80 * 81 * @sdp_type: secondary-data packet type 82 * @revision: revision number 83 * @length: number of valid data bytes 84 * @pixelformat: pixel encoding format 85 * @colorimetry: colorimetry format 86 * @bpc: bit per color 87 * @dynamic_range: dynamic range information 88 * @content_type: CTA-861-G defines content types and expected processing by a sink device 89 */ 90 struct drm_dp_vsc_sdp { 91 unsigned char sdp_type; 92 unsigned char revision; 93 unsigned char length; 94 enum dp_pixelformat pixelformat; 95 enum dp_colorimetry colorimetry; 96 int bpc; 97 enum dp_dynamic_range dynamic_range; 98 enum dp_content_type content_type; 99 }; 100 101 /** 102 * struct drm_dp_as_sdp - drm DP Adaptive Sync SDP 103 * 104 * This structure represents a DP AS SDP of drm 105 * It is based on DP 2.1 spec [Table 2-126: Adaptive-Sync SDP Header Bytes] and 106 * [Table 2-127: Adaptive-Sync SDP Payload for DB0 through DB8] 107 * 108 * @sdp_type: Secondary-data packet type 109 * @revision: Revision Number 110 * @length: Number of valid data bytes 111 * @vtotal: Minimum Vertical Vtotal 112 * @target_rr: Target Refresh 113 * @duration_incr_ms: Successive frame duration increase 114 * @duration_decr_ms: Successive frame duration decrease 115 * @target_rr_divider: Target refresh rate divider 116 * @mode: Adaptive Sync Operation Mode 117 */ 118 struct drm_dp_as_sdp { 119 unsigned char sdp_type; 120 unsigned char revision; 121 unsigned char length; 122 int vtotal; 123 int target_rr; 124 int duration_incr_ms; 125 int duration_decr_ms; 126 bool target_rr_divider; 127 enum operation_mode mode; 128 }; 129 130 void drm_dp_as_sdp_log(struct drm_printer *p, 131 const struct drm_dp_as_sdp *as_sdp); 132 void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc); 133 134 bool drm_dp_vsc_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); 135 bool drm_dp_as_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]); 136 137 int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]); 138 139 static inline int 140 drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 141 { 142 return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]); 143 } 144 145 static inline u8 146 drm_dp_max_lane_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 147 { 148 return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK; 149 } 150 151 static inline bool 152 drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 153 { 154 return dpcd[DP_DPCD_REV] >= 0x11 && 155 (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP); 156 } 157 158 static inline bool 159 drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 160 { 161 return dpcd[DP_DPCD_REV] >= 0x11 && 162 (dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING); 163 } 164 165 static inline bool 166 drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 167 { 168 return dpcd[DP_DPCD_REV] >= 0x12 && 169 dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED; 170 } 171 172 static inline bool 173 drm_dp_max_downspread(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 174 { 175 return dpcd[DP_DPCD_REV] >= 0x11 || 176 dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5; 177 } 178 179 static inline bool 180 drm_dp_tps4_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 181 { 182 return dpcd[DP_DPCD_REV] >= 0x14 && 183 dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED; 184 } 185 186 static inline u8 187 drm_dp_training_pattern_mask(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 188 { 189 return (dpcd[DP_DPCD_REV] >= 0x14) ? DP_TRAINING_PATTERN_MASK_1_4 : 190 DP_TRAINING_PATTERN_MASK; 191 } 192 193 static inline bool 194 drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 195 { 196 return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT; 197 } 198 199 /* DP/eDP DSC support */ 200 u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]); 201 u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], 202 bool is_edp); 203 u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]); 204 int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE], 205 u8 dsc_bpc[3]); 206 207 static inline bool 208 drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) 209 { 210 return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & 211 DP_DSC_DECOMPRESSION_IS_SUPPORTED; 212 } 213 214 static inline u16 215 drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) 216 { 217 return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] | 218 ((dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] & 219 DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK) << 8); 220 } 221 222 static inline u32 223 drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) 224 { 225 /* Max Slicewidth = Number of Pixels * 320 */ 226 return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * 227 DP_DSC_SLICE_WIDTH_MULTIPLIER; 228 } 229 230 /** 231 * drm_dp_dsc_sink_supports_format() - check if sink supports DSC with given output format 232 * @dsc_dpcd : DSC-capability DPCDs of the sink 233 * @output_format: output_format which is to be checked 234 * 235 * Returns true if the sink supports DSC with the given output_format, false otherwise. 236 */ 237 static inline bool 238 drm_dp_dsc_sink_supports_format(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], u8 output_format) 239 { 240 return dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] & output_format; 241 } 242 243 /* Forward Error Correction Support on DP 1.4 */ 244 static inline bool 245 drm_dp_sink_supports_fec(const u8 fec_capable) 246 { 247 return fec_capable & DP_FEC_CAPABLE; 248 } 249 250 static inline bool 251 drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 252 { 253 return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B; 254 } 255 256 static inline bool 257 drm_dp_128b132b_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 258 { 259 return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_128B132B; 260 } 261 262 static inline bool 263 drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 264 { 265 return dpcd[DP_EDP_CONFIGURATION_CAP] & 266 DP_ALTERNATE_SCRAMBLER_RESET_CAP; 267 } 268 269 /* Ignore MSA timing for Adaptive Sync support on DP 1.4 */ 270 static inline bool 271 drm_dp_sink_can_do_video_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 272 { 273 return dpcd[DP_DOWN_STREAM_PORT_COUNT] & 274 DP_MSA_TIMING_PAR_IGNORED; 275 } 276 277 /** 278 * drm_edp_backlight_supported() - Check an eDP DPCD for VESA backlight support 279 * @edp_dpcd: The DPCD to check 280 * 281 * Note that currently this function will return %false for panels which support various DPCD 282 * backlight features but which require the brightness be set through PWM, and don't support setting 283 * the brightness level via the DPCD. 284 * 285 * Returns: %True if @edp_dpcd indicates that VESA backlight controls are supported, %false 286 * otherwise 287 */ 288 static inline bool 289 drm_edp_backlight_supported(const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE]) 290 { 291 return !!(edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP); 292 } 293 294 /** 295 * drm_dp_is_uhbr_rate - Determine if a link rate is UHBR 296 * @link_rate: link rate in 10kbits/s units 297 * 298 * Determine if the provided link rate is an UHBR rate. 299 * 300 * Returns: %True if @link_rate is an UHBR rate. 301 */ 302 static inline bool drm_dp_is_uhbr_rate(int link_rate) 303 { 304 return link_rate >= 1000000; 305 } 306 307 /* 308 * DisplayPort AUX channel 309 */ 310 311 /** 312 * struct drm_dp_aux_msg - DisplayPort AUX channel transaction 313 * @address: address of the (first) register to access 314 * @request: contains the type of transaction (see DP_AUX_* macros) 315 * @reply: upon completion, contains the reply type of the transaction 316 * @buffer: pointer to a transmission or reception buffer 317 * @size: size of @buffer 318 */ 319 struct drm_dp_aux_msg { 320 unsigned int address; 321 u8 request; 322 u8 reply; 323 void *buffer; 324 size_t size; 325 }; 326 327 struct cec_adapter; 328 struct drm_connector; 329 struct drm_edid; 330 331 /** 332 * struct drm_dp_aux_cec - DisplayPort CEC-Tunneling-over-AUX 333 * @lock: mutex protecting this struct 334 * @adap: the CEC adapter for CEC-Tunneling-over-AUX support. 335 * @connector: the connector this CEC adapter is associated with 336 * @unregister_work: unregister the CEC adapter 337 */ 338 struct drm_dp_aux_cec { 339 struct mutex lock; 340 struct cec_adapter *adap; 341 struct drm_connector *connector; 342 struct delayed_work unregister_work; 343 }; 344 345 /** 346 * struct drm_dp_aux - DisplayPort AUX channel 347 * 348 * An AUX channel can also be used to transport I2C messages to a sink. A 349 * typical application of that is to access an EDID that's present in the sink 350 * device. The @transfer() function can also be used to execute such 351 * transactions. The drm_dp_aux_register() function registers an I2C adapter 352 * that can be passed to drm_probe_ddc(). Upon removal, drivers should call 353 * drm_dp_aux_unregister() to remove the I2C adapter. The I2C adapter uses long 354 * transfers by default; if a partial response is received, the adapter will 355 * drop down to the size given by the partial response for this transaction 356 * only. 357 */ 358 struct drm_dp_aux { 359 /** 360 * @name: user-visible name of this AUX channel and the 361 * I2C-over-AUX adapter. 362 * 363 * It's also used to specify the name of the I2C adapter. If set 364 * to %NULL, dev_name() of @dev will be used. 365 */ 366 const char *name; 367 368 /** 369 * @ddc: I2C adapter that can be used for I2C-over-AUX 370 * communication 371 */ 372 struct i2c_adapter ddc; 373 374 /** 375 * @dev: pointer to struct device that is the parent for this 376 * AUX channel. 377 */ 378 struct device *dev; 379 380 /** 381 * @drm_dev: pointer to the &drm_device that owns this AUX channel. 382 * Beware, this may be %NULL before drm_dp_aux_register() has been 383 * called. 384 * 385 * It should be set to the &drm_device that will be using this AUX 386 * channel as early as possible. For many graphics drivers this should 387 * happen before drm_dp_aux_init(), however it's perfectly fine to set 388 * this field later so long as it's assigned before calling 389 * drm_dp_aux_register(). 390 */ 391 struct drm_device *drm_dev; 392 393 /** 394 * @crtc: backpointer to the crtc that is currently using this 395 * AUX channel 396 */ 397 struct drm_crtc *crtc; 398 399 /** 400 * @hw_mutex: internal mutex used for locking transfers. 401 * 402 * Note that if the underlying hardware is shared among multiple 403 * channels, the driver needs to do additional locking to 404 * prevent concurrent access. 405 */ 406 struct mutex hw_mutex; 407 408 /** 409 * @crc_work: worker that captures CRCs for each frame 410 */ 411 struct work_struct crc_work; 412 413 /** 414 * @crc_count: counter of captured frame CRCs 415 */ 416 u8 crc_count; 417 418 /** 419 * @transfer: transfers a message representing a single AUX 420 * transaction. 421 * 422 * This is a hardware-specific implementation of how 423 * transactions are executed that the drivers must provide. 424 * 425 * A pointer to a &drm_dp_aux_msg structure describing the 426 * transaction is passed into this function. Upon success, the 427 * implementation should return the number of payload bytes that 428 * were transferred, or a negative error-code on failure. 429 * 430 * Helpers will propagate these errors, with the exception of 431 * the %-EBUSY error, which causes a transaction to be retried. 432 * On a short, helpers will return %-EPROTO to make it simpler 433 * to check for failure. 434 * 435 * The @transfer() function must only modify the reply field of 436 * the &drm_dp_aux_msg structure. The retry logic and i2c 437 * helpers assume this is the case. 438 * 439 * Also note that this callback can be called no matter the 440 * state @dev is in and also no matter what state the panel is 441 * in. It's expected: 442 * 443 * - If the @dev providing the AUX bus is currently unpowered then 444 * it will power itself up for the transfer. 445 * 446 * - If we're on eDP (using a drm_panel) and the panel is not in a 447 * state where it can respond (it's not powered or it's in a 448 * low power state) then this function may return an error, but 449 * not crash. It's up to the caller of this code to make sure that 450 * the panel is powered on if getting an error back is not OK. If a 451 * drm_panel driver is initiating a DP AUX transfer it may power 452 * itself up however it wants. All other code should ensure that 453 * the pre_enable() bridge chain (which eventually calls the 454 * drm_panel prepare function) has powered the panel. 455 */ 456 ssize_t (*transfer)(struct drm_dp_aux *aux, 457 struct drm_dp_aux_msg *msg); 458 459 /** 460 * @wait_hpd_asserted: wait for HPD to be asserted 461 * 462 * This is mainly useful for eDP panels drivers to wait for an eDP 463 * panel to finish powering on. It is optional for DP AUX controllers 464 * to implement this function. It is required for DP AUX endpoints 465 * (panel drivers) to call this function after powering up but before 466 * doing AUX transfers unless the DP AUX endpoint driver knows that 467 * we're not using the AUX controller's HPD. One example of the panel 468 * driver not needing to call this is if HPD is hooked up to a GPIO 469 * that the panel driver can read directly. 470 * 471 * If a DP AUX controller does not implement this function then it 472 * may still support eDP panels that use the AUX controller's built-in 473 * HPD signal by implementing a long wait for HPD in the transfer() 474 * callback, though this is deprecated. 475 * 476 * This function will efficiently wait for the HPD signal to be 477 * asserted. The `wait_us` parameter that is passed in says that we 478 * know that the HPD signal is expected to be asserted within `wait_us` 479 * microseconds. This function could wait for longer than `wait_us` if 480 * the logic in the DP controller has a long debouncing time. The 481 * important thing is that if this function returns success that the 482 * DP controller is ready to send AUX transactions. 483 * 484 * This function returns 0 if HPD was asserted or -ETIMEDOUT if time 485 * expired and HPD wasn't asserted. This function should not print 486 * timeout errors to the log. 487 * 488 * The semantics of this function are designed to match the 489 * readx_poll_timeout() function. That means a `wait_us` of 0 means 490 * to wait forever. Like readx_poll_timeout(), this function may sleep. 491 * 492 * NOTE: this function specifically reports the state of the HPD pin 493 * that's associated with the DP AUX channel. This is different from 494 * the HPD concept in much of the rest of DRM which is more about 495 * physical presence of a display. For eDP, for instance, a display is 496 * assumed always present even if the HPD pin is deasserted. 497 */ 498 int (*wait_hpd_asserted)(struct drm_dp_aux *aux, unsigned long wait_us); 499 500 /** 501 * @i2c_nack_count: Counts I2C NACKs, used for DP validation. 502 */ 503 unsigned i2c_nack_count; 504 /** 505 * @i2c_defer_count: Counts I2C DEFERs, used for DP validation. 506 */ 507 unsigned i2c_defer_count; 508 /** 509 * @cec: struct containing fields used for CEC-Tunneling-over-AUX. 510 */ 511 struct drm_dp_aux_cec cec; 512 /** 513 * @is_remote: Is this AUX CH actually using sideband messaging. 514 */ 515 bool is_remote; 516 517 /** 518 * @powered_down: If true then the remote endpoint is powered down. 519 */ 520 bool powered_down; 521 }; 522 523 int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset); 524 void drm_dp_dpcd_set_powered(struct drm_dp_aux *aux, bool powered); 525 ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset, 526 void *buffer, size_t size); 527 ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset, 528 void *buffer, size_t size); 529 530 /** 531 * drm_dp_dpcd_readb() - read a single byte from the DPCD 532 * @aux: DisplayPort AUX channel 533 * @offset: address of the register to read 534 * @valuep: location where the value of the register will be stored 535 * 536 * Returns the number of bytes transferred (1) on success, or a negative 537 * error code on failure. 538 */ 539 static inline ssize_t drm_dp_dpcd_readb(struct drm_dp_aux *aux, 540 unsigned int offset, u8 *valuep) 541 { 542 return drm_dp_dpcd_read(aux, offset, valuep, 1); 543 } 544 545 /** 546 * drm_dp_dpcd_writeb() - write a single byte to the DPCD 547 * @aux: DisplayPort AUX channel 548 * @offset: address of the register to write 549 * @value: value to write to the register 550 * 551 * Returns the number of bytes transferred (1) on success, or a negative 552 * error code on failure. 553 */ 554 static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, 555 unsigned int offset, u8 value) 556 { 557 return drm_dp_dpcd_write(aux, offset, &value, 1); 558 } 559 560 int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux, 561 u8 dpcd[DP_RECEIVER_CAP_SIZE]); 562 563 int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, 564 u8 status[DP_LINK_STATUS_SIZE]); 565 566 int drm_dp_dpcd_read_phy_link_status(struct drm_dp_aux *aux, 567 enum drm_dp_phy dp_phy, 568 u8 link_status[DP_LINK_STATUS_SIZE]); 569 570 bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux, 571 u8 real_edid_checksum); 572 573 int drm_dp_read_downstream_info(struct drm_dp_aux *aux, 574 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 575 u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS]); 576 bool drm_dp_downstream_is_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 577 const u8 port_cap[4], u8 type); 578 bool drm_dp_downstream_is_tmds(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 579 const u8 port_cap[4], 580 const struct drm_edid *drm_edid); 581 int drm_dp_downstream_max_dotclock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 582 const u8 port_cap[4]); 583 int drm_dp_downstream_max_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 584 const u8 port_cap[4], 585 const struct drm_edid *drm_edid); 586 int drm_dp_downstream_min_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 587 const u8 port_cap[4], 588 const struct drm_edid *drm_edid); 589 int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 590 const u8 port_cap[4], 591 const struct drm_edid *drm_edid); 592 bool drm_dp_downstream_420_passthrough(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 593 const u8 port_cap[4]); 594 bool drm_dp_downstream_444_to_420_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 595 const u8 port_cap[4]); 596 struct drm_display_mode *drm_dp_downstream_mode(struct drm_device *dev, 597 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 598 const u8 port_cap[4]); 599 int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]); 600 void drm_dp_downstream_debug(struct seq_file *m, 601 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 602 const u8 port_cap[4], 603 const struct drm_edid *drm_edid, 604 struct drm_dp_aux *aux); 605 enum drm_mode_subconnector 606 drm_dp_subconnector_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 607 const u8 port_cap[4]); 608 void drm_dp_set_subconnector_property(struct drm_connector *connector, 609 enum drm_connector_status status, 610 const u8 *dpcd, 611 const u8 port_cap[4]); 612 613 struct drm_dp_desc; 614 bool drm_dp_read_sink_count_cap(struct drm_connector *connector, 615 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 616 const struct drm_dp_desc *desc); 617 int drm_dp_read_sink_count(struct drm_dp_aux *aux); 618 619 int drm_dp_read_lttpr_common_caps(struct drm_dp_aux *aux, 620 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 621 u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); 622 int drm_dp_read_lttpr_phy_caps(struct drm_dp_aux *aux, 623 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 624 enum drm_dp_phy dp_phy, 625 u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 626 int drm_dp_lttpr_count(const u8 cap[DP_LTTPR_COMMON_CAP_SIZE]); 627 int drm_dp_lttpr_max_link_rate(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); 628 int drm_dp_lttpr_max_lane_count(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); 629 bool drm_dp_lttpr_voltage_swing_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 630 bool drm_dp_lttpr_pre_emphasis_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 631 632 void drm_dp_remote_aux_init(struct drm_dp_aux *aux); 633 void drm_dp_aux_init(struct drm_dp_aux *aux); 634 int drm_dp_aux_register(struct drm_dp_aux *aux); 635 void drm_dp_aux_unregister(struct drm_dp_aux *aux); 636 637 int drm_dp_start_crc(struct drm_dp_aux *aux, struct drm_crtc *crtc); 638 int drm_dp_stop_crc(struct drm_dp_aux *aux); 639 640 struct drm_dp_dpcd_ident { 641 u8 oui[3]; 642 u8 device_id[6]; 643 u8 hw_rev; 644 u8 sw_major_rev; 645 u8 sw_minor_rev; 646 } __packed; 647 648 /** 649 * struct drm_dp_desc - DP branch/sink device descriptor 650 * @ident: DP device identification from DPCD 0x400 (sink) or 0x500 (branch). 651 * @quirks: Quirks; use drm_dp_has_quirk() to query for the quirks. 652 */ 653 struct drm_dp_desc { 654 struct drm_dp_dpcd_ident ident; 655 u32 quirks; 656 }; 657 658 int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc, 659 bool is_branch); 660 661 int drm_dp_dump_lttpr_desc(struct drm_dp_aux *aux, enum drm_dp_phy dp_phy); 662 663 /** 664 * enum drm_dp_quirk - Display Port sink/branch device specific quirks 665 * 666 * Display Port sink and branch devices in the wild have a variety of bugs, try 667 * to collect them here. The quirks are shared, but it's up to the drivers to 668 * implement workarounds for them. 669 */ 670 enum drm_dp_quirk { 671 /** 672 * @DP_DPCD_QUIRK_CONSTANT_N: 673 * 674 * The device requires main link attributes Mvid and Nvid to be limited 675 * to 16 bits. So will give a constant value (0x8000) for compatability. 676 */ 677 DP_DPCD_QUIRK_CONSTANT_N, 678 /** 679 * @DP_DPCD_QUIRK_NO_PSR: 680 * 681 * The device does not support PSR even if reports that it supports or 682 * driver still need to implement proper handling for such device. 683 */ 684 DP_DPCD_QUIRK_NO_PSR, 685 /** 686 * @DP_DPCD_QUIRK_NO_SINK_COUNT: 687 * 688 * The device does not set SINK_COUNT to a non-zero value. 689 * The driver should ignore SINK_COUNT during detection. Note that 690 * drm_dp_read_sink_count_cap() automatically checks for this quirk. 691 */ 692 DP_DPCD_QUIRK_NO_SINK_COUNT, 693 /** 694 * @DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD: 695 * 696 * The device supports MST DSC despite not supporting Virtual DPCD. 697 * The DSC caps can be read from the physical aux instead. 698 */ 699 DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD, 700 /** 701 * @DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS: 702 * 703 * The device supports a link rate of 3.24 Gbps (multiplier 0xc) despite 704 * the DP_MAX_LINK_RATE register reporting a lower max multiplier. 705 */ 706 DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS, 707 /** 708 * @DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC: 709 * 710 * The device applies HBLANK expansion for some modes, but this 711 * requires enabling DSC. 712 */ 713 DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC, 714 }; 715 716 /** 717 * drm_dp_has_quirk() - does the DP device have a specific quirk 718 * @desc: Device descriptor filled by drm_dp_read_desc() 719 * @quirk: Quirk to query for 720 * 721 * Return true if DP device identified by @desc has @quirk. 722 */ 723 static inline bool 724 drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk) 725 { 726 return desc->quirks & BIT(quirk); 727 } 728 729 /** 730 * struct drm_edp_backlight_info - Probed eDP backlight info struct 731 * @pwmgen_bit_count: The pwmgen bit count 732 * @pwm_freq_pre_divider: The PWM frequency pre-divider value being used for this backlight, if any 733 * @max: The maximum backlight level that may be set 734 * @lsb_reg_used: Do we also write values to the DP_EDP_BACKLIGHT_BRIGHTNESS_LSB register? 735 * @aux_enable: Does the panel support the AUX enable cap? 736 * @aux_set: Does the panel support setting the brightness through AUX? 737 * 738 * This structure contains various data about an eDP backlight, which can be populated by using 739 * drm_edp_backlight_init(). 740 */ 741 struct drm_edp_backlight_info { 742 u8 pwmgen_bit_count; 743 u8 pwm_freq_pre_divider; 744 u16 max; 745 746 bool lsb_reg_used : 1; 747 bool aux_enable : 1; 748 bool aux_set : 1; 749 }; 750 751 int 752 drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl, 753 u16 driver_pwm_freq_hz, const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE], 754 u16 *current_level, u8 *current_mode); 755 int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl, 756 u16 level); 757 int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl, 758 u16 level); 759 int drm_edp_backlight_disable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl); 760 761 #if IS_ENABLED(CONFIG_DRM_KMS_HELPER) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \ 762 (IS_MODULE(CONFIG_DRM_KMS_HELPER) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE))) 763 764 int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux); 765 766 #else 767 768 static inline int drm_panel_dp_aux_backlight(struct drm_panel *panel, 769 struct drm_dp_aux *aux) 770 { 771 return 0; 772 } 773 774 #endif 775 776 #ifdef CONFIG_DRM_DISPLAY_DP_AUX_CEC 777 void drm_dp_cec_irq(struct drm_dp_aux *aux); 778 void drm_dp_cec_register_connector(struct drm_dp_aux *aux, 779 struct drm_connector *connector); 780 void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux); 781 void drm_dp_cec_attach(struct drm_dp_aux *aux, u16 source_physical_address); 782 void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid); 783 void drm_dp_cec_unset_edid(struct drm_dp_aux *aux); 784 #else 785 static inline void drm_dp_cec_irq(struct drm_dp_aux *aux) 786 { 787 } 788 789 static inline void 790 drm_dp_cec_register_connector(struct drm_dp_aux *aux, 791 struct drm_connector *connector) 792 { 793 } 794 795 static inline void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux) 796 { 797 } 798 799 static inline void drm_dp_cec_attach(struct drm_dp_aux *aux, 800 u16 source_physical_address) 801 { 802 } 803 804 static inline void drm_dp_cec_set_edid(struct drm_dp_aux *aux, 805 const struct edid *edid) 806 { 807 } 808 809 static inline void drm_dp_cec_unset_edid(struct drm_dp_aux *aux) 810 { 811 } 812 813 #endif 814 815 /** 816 * struct drm_dp_phy_test_params - DP Phy Compliance parameters 817 * @link_rate: Requested Link rate from DPCD 0x219 818 * @num_lanes: Number of lanes requested by sing through DPCD 0x220 819 * @phy_pattern: DP Phy test pattern from DPCD 0x248 820 * @hbr2_reset: DP HBR2_COMPLIANCE_SCRAMBLER_RESET from DCPD 0x24A and 0x24B 821 * @custom80: DP Test_80BIT_CUSTOM_PATTERN from DPCDs 0x250 through 0x259 822 * @enhanced_frame_cap: flag for enhanced frame capability. 823 */ 824 struct drm_dp_phy_test_params { 825 int link_rate; 826 u8 num_lanes; 827 u8 phy_pattern; 828 u8 hbr2_reset[2]; 829 u8 custom80[10]; 830 bool enhanced_frame_cap; 831 }; 832 833 int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux, 834 struct drm_dp_phy_test_params *data); 835 int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux, 836 struct drm_dp_phy_test_params *data, u8 dp_rev); 837 int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 838 const u8 port_cap[4]); 839 int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd); 840 bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux); 841 int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps, 842 u8 frl_mode); 843 int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask, 844 u8 frl_type); 845 int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux); 846 int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux); 847 848 bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux); 849 int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask); 850 void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux, 851 struct drm_connector *connector); 852 bool drm_dp_pcon_enc_is_dsc_1_2(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 853 int drm_dp_pcon_dsc_max_slices(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 854 int drm_dp_pcon_dsc_max_slice_width(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 855 int drm_dp_pcon_dsc_bpp_incr(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 856 int drm_dp_pcon_pps_default(struct drm_dp_aux *aux); 857 int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128]); 858 int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6]); 859 bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 860 const u8 port_cap[4], u8 color_spc); 861 int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc); 862 863 #define DRM_DP_BW_OVERHEAD_MST BIT(0) 864 #define DRM_DP_BW_OVERHEAD_UHBR BIT(1) 865 #define DRM_DP_BW_OVERHEAD_SSC_REF_CLK BIT(2) 866 #define DRM_DP_BW_OVERHEAD_FEC BIT(3) 867 #define DRM_DP_BW_OVERHEAD_DSC BIT(4) 868 869 int drm_dp_bw_overhead(int lane_count, int hactive, 870 int dsc_slice_count, 871 int bpp_x16, unsigned long flags); 872 int drm_dp_bw_channel_coding_efficiency(bool is_uhbr); 873 int drm_dp_max_dprx_data_rate(int max_link_rate, int max_lanes); 874 875 ssize_t drm_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc, struct dp_sdp *sdp); 876 877 #endif /* _DRM_DP_HELPER_H_ */ 878