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 void drm_dp_vsc_sdp_log(const char *level, struct device *dev, 102 const struct drm_dp_vsc_sdp *vsc); 103 104 int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]); 105 106 static inline int 107 drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 108 { 109 return drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]); 110 } 111 112 static inline u8 113 drm_dp_max_lane_count(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 114 { 115 return dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK; 116 } 117 118 static inline bool 119 drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 120 { 121 return dpcd[DP_DPCD_REV] >= 0x11 && 122 (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP); 123 } 124 125 static inline bool 126 drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 127 { 128 return dpcd[DP_DPCD_REV] >= 0x11 && 129 (dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING); 130 } 131 132 static inline bool 133 drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 134 { 135 return dpcd[DP_DPCD_REV] >= 0x12 && 136 dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED; 137 } 138 139 static inline bool 140 drm_dp_max_downspread(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 141 { 142 return dpcd[DP_DPCD_REV] >= 0x11 || 143 dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5; 144 } 145 146 static inline bool 147 drm_dp_tps4_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 148 { 149 return dpcd[DP_DPCD_REV] >= 0x14 && 150 dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED; 151 } 152 153 static inline u8 154 drm_dp_training_pattern_mask(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 155 { 156 return (dpcd[DP_DPCD_REV] >= 0x14) ? DP_TRAINING_PATTERN_MASK_1_4 : 157 DP_TRAINING_PATTERN_MASK; 158 } 159 160 static inline bool 161 drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 162 { 163 return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT; 164 } 165 166 /* DP/eDP DSC support */ 167 u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], 168 bool is_edp); 169 u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]); 170 int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE], 171 u8 dsc_bpc[3]); 172 173 static inline bool 174 drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) 175 { 176 return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & 177 DP_DSC_DECOMPRESSION_IS_SUPPORTED; 178 } 179 180 static inline u16 181 drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) 182 { 183 return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] | 184 ((dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] & 185 DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK) << 8); 186 } 187 188 static inline u32 189 drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) 190 { 191 /* Max Slicewidth = Number of Pixels * 320 */ 192 return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * 193 DP_DSC_SLICE_WIDTH_MULTIPLIER; 194 } 195 196 /** 197 * drm_dp_dsc_sink_supports_format() - check if sink supports DSC with given output format 198 * @dsc_dpcd : DSC-capability DPCDs of the sink 199 * @output_format: output_format which is to be checked 200 * 201 * Returns true if the sink supports DSC with the given output_format, false otherwise. 202 */ 203 static inline bool 204 drm_dp_dsc_sink_supports_format(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE], u8 output_format) 205 { 206 return dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] & output_format; 207 } 208 209 /* Forward Error Correction Support on DP 1.4 */ 210 static inline bool 211 drm_dp_sink_supports_fec(const u8 fec_capable) 212 { 213 return fec_capable & DP_FEC_CAPABLE; 214 } 215 216 static inline bool 217 drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 218 { 219 return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B; 220 } 221 222 static inline bool 223 drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 224 { 225 return dpcd[DP_EDP_CONFIGURATION_CAP] & 226 DP_ALTERNATE_SCRAMBLER_RESET_CAP; 227 } 228 229 /* Ignore MSA timing for Adaptive Sync support on DP 1.4 */ 230 static inline bool 231 drm_dp_sink_can_do_video_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) 232 { 233 return dpcd[DP_DOWN_STREAM_PORT_COUNT] & 234 DP_MSA_TIMING_PAR_IGNORED; 235 } 236 237 /** 238 * drm_edp_backlight_supported() - Check an eDP DPCD for VESA backlight support 239 * @edp_dpcd: The DPCD to check 240 * 241 * Note that currently this function will return %false for panels which support various DPCD 242 * backlight features but which require the brightness be set through PWM, and don't support setting 243 * the brightness level via the DPCD. 244 * 245 * Returns: %True if @edp_dpcd indicates that VESA backlight controls are supported, %false 246 * otherwise 247 */ 248 static inline bool 249 drm_edp_backlight_supported(const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE]) 250 { 251 return !!(edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP); 252 } 253 254 /* 255 * DisplayPort AUX channel 256 */ 257 258 /** 259 * struct drm_dp_aux_msg - DisplayPort AUX channel transaction 260 * @address: address of the (first) register to access 261 * @request: contains the type of transaction (see DP_AUX_* macros) 262 * @reply: upon completion, contains the reply type of the transaction 263 * @buffer: pointer to a transmission or reception buffer 264 * @size: size of @buffer 265 */ 266 struct drm_dp_aux_msg { 267 unsigned int address; 268 u8 request; 269 u8 reply; 270 void *buffer; 271 size_t size; 272 }; 273 274 struct cec_adapter; 275 struct drm_connector; 276 struct drm_edid; 277 278 /** 279 * struct drm_dp_aux_cec - DisplayPort CEC-Tunneling-over-AUX 280 * @lock: mutex protecting this struct 281 * @adap: the CEC adapter for CEC-Tunneling-over-AUX support. 282 * @connector: the connector this CEC adapter is associated with 283 * @unregister_work: unregister the CEC adapter 284 */ 285 struct drm_dp_aux_cec { 286 struct mutex lock; 287 struct cec_adapter *adap; 288 struct drm_connector *connector; 289 struct delayed_work unregister_work; 290 }; 291 292 /** 293 * struct drm_dp_aux - DisplayPort AUX channel 294 * 295 * An AUX channel can also be used to transport I2C messages to a sink. A 296 * typical application of that is to access an EDID that's present in the sink 297 * device. The @transfer() function can also be used to execute such 298 * transactions. The drm_dp_aux_register() function registers an I2C adapter 299 * that can be passed to drm_probe_ddc(). Upon removal, drivers should call 300 * drm_dp_aux_unregister() to remove the I2C adapter. The I2C adapter uses long 301 * transfers by default; if a partial response is received, the adapter will 302 * drop down to the size given by the partial response for this transaction 303 * only. 304 */ 305 struct drm_dp_aux { 306 /** 307 * @name: user-visible name of this AUX channel and the 308 * I2C-over-AUX adapter. 309 * 310 * It's also used to specify the name of the I2C adapter. If set 311 * to %NULL, dev_name() of @dev will be used. 312 */ 313 const char *name; 314 315 /** 316 * @ddc: I2C adapter that can be used for I2C-over-AUX 317 * communication 318 */ 319 struct i2c_adapter ddc; 320 321 /** 322 * @dev: pointer to struct device that is the parent for this 323 * AUX channel. 324 */ 325 struct device *dev; 326 327 /** 328 * @drm_dev: pointer to the &drm_device that owns this AUX channel. 329 * Beware, this may be %NULL before drm_dp_aux_register() has been 330 * called. 331 * 332 * It should be set to the &drm_device that will be using this AUX 333 * channel as early as possible. For many graphics drivers this should 334 * happen before drm_dp_aux_init(), however it's perfectly fine to set 335 * this field later so long as it's assigned before calling 336 * drm_dp_aux_register(). 337 */ 338 struct drm_device *drm_dev; 339 340 /** 341 * @crtc: backpointer to the crtc that is currently using this 342 * AUX channel 343 */ 344 struct drm_crtc *crtc; 345 346 /** 347 * @hw_mutex: internal mutex used for locking transfers. 348 * 349 * Note that if the underlying hardware is shared among multiple 350 * channels, the driver needs to do additional locking to 351 * prevent concurrent access. 352 */ 353 struct mutex hw_mutex; 354 355 /** 356 * @crc_work: worker that captures CRCs for each frame 357 */ 358 struct work_struct crc_work; 359 360 /** 361 * @crc_count: counter of captured frame CRCs 362 */ 363 u8 crc_count; 364 365 /** 366 * @transfer: transfers a message representing a single AUX 367 * transaction. 368 * 369 * This is a hardware-specific implementation of how 370 * transactions are executed that the drivers must provide. 371 * 372 * A pointer to a &drm_dp_aux_msg structure describing the 373 * transaction is passed into this function. Upon success, the 374 * implementation should return the number of payload bytes that 375 * were transferred, or a negative error-code on failure. 376 * 377 * Helpers will propagate these errors, with the exception of 378 * the %-EBUSY error, which causes a transaction to be retried. 379 * On a short, helpers will return %-EPROTO to make it simpler 380 * to check for failure. 381 * 382 * The @transfer() function must only modify the reply field of 383 * the &drm_dp_aux_msg structure. The retry logic and i2c 384 * helpers assume this is the case. 385 * 386 * Also note that this callback can be called no matter the 387 * state @dev is in and also no matter what state the panel is 388 * in. It's expected: 389 * 390 * - If the @dev providing the AUX bus is currently unpowered then 391 * it will power itself up for the transfer. 392 * 393 * - If we're on eDP (using a drm_panel) and the panel is not in a 394 * state where it can respond (it's not powered or it's in a 395 * low power state) then this function may return an error, but 396 * not crash. It's up to the caller of this code to make sure that 397 * the panel is powered on if getting an error back is not OK. If a 398 * drm_panel driver is initiating a DP AUX transfer it may power 399 * itself up however it wants. All other code should ensure that 400 * the pre_enable() bridge chain (which eventually calls the 401 * drm_panel prepare function) has powered the panel. 402 */ 403 ssize_t (*transfer)(struct drm_dp_aux *aux, 404 struct drm_dp_aux_msg *msg); 405 406 /** 407 * @wait_hpd_asserted: wait for HPD to be asserted 408 * 409 * This is mainly useful for eDP panels drivers to wait for an eDP 410 * panel to finish powering on. This is an optional function. 411 * 412 * This function will efficiently wait for the HPD signal to be 413 * asserted. The `wait_us` parameter that is passed in says that we 414 * know that the HPD signal is expected to be asserted within `wait_us` 415 * microseconds. This function could wait for longer than `wait_us` if 416 * the logic in the DP controller has a long debouncing time. The 417 * important thing is that if this function returns success that the 418 * DP controller is ready to send AUX transactions. 419 * 420 * This function returns 0 if HPD was asserted or -ETIMEDOUT if time 421 * expired and HPD wasn't asserted. This function should not print 422 * timeout errors to the log. 423 * 424 * The semantics of this function are designed to match the 425 * readx_poll_timeout() function. That means a `wait_us` of 0 means 426 * to wait forever. Like readx_poll_timeout(), this function may sleep. 427 * 428 * NOTE: this function specifically reports the state of the HPD pin 429 * that's associated with the DP AUX channel. This is different from 430 * the HPD concept in much of the rest of DRM which is more about 431 * physical presence of a display. For eDP, for instance, a display is 432 * assumed always present even if the HPD pin is deasserted. 433 */ 434 int (*wait_hpd_asserted)(struct drm_dp_aux *aux, unsigned long wait_us); 435 436 /** 437 * @i2c_nack_count: Counts I2C NACKs, used for DP validation. 438 */ 439 unsigned i2c_nack_count; 440 /** 441 * @i2c_defer_count: Counts I2C DEFERs, used for DP validation. 442 */ 443 unsigned i2c_defer_count; 444 /** 445 * @cec: struct containing fields used for CEC-Tunneling-over-AUX. 446 */ 447 struct drm_dp_aux_cec cec; 448 /** 449 * @is_remote: Is this AUX CH actually using sideband messaging. 450 */ 451 bool is_remote; 452 }; 453 454 int drm_dp_dpcd_probe(struct drm_dp_aux *aux, unsigned int offset); 455 ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset, 456 void *buffer, size_t size); 457 ssize_t drm_dp_dpcd_write(struct drm_dp_aux *aux, unsigned int offset, 458 void *buffer, size_t size); 459 460 /** 461 * drm_dp_dpcd_readb() - read a single byte from the DPCD 462 * @aux: DisplayPort AUX channel 463 * @offset: address of the register to read 464 * @valuep: location where the value of the register will be stored 465 * 466 * Returns the number of bytes transferred (1) on success, or a negative 467 * error code on failure. 468 */ 469 static inline ssize_t drm_dp_dpcd_readb(struct drm_dp_aux *aux, 470 unsigned int offset, u8 *valuep) 471 { 472 return drm_dp_dpcd_read(aux, offset, valuep, 1); 473 } 474 475 /** 476 * drm_dp_dpcd_writeb() - write a single byte to the DPCD 477 * @aux: DisplayPort AUX channel 478 * @offset: address of the register to write 479 * @value: value to write to the register 480 * 481 * Returns the number of bytes transferred (1) on success, or a negative 482 * error code on failure. 483 */ 484 static inline ssize_t drm_dp_dpcd_writeb(struct drm_dp_aux *aux, 485 unsigned int offset, u8 value) 486 { 487 return drm_dp_dpcd_write(aux, offset, &value, 1); 488 } 489 490 int drm_dp_read_dpcd_caps(struct drm_dp_aux *aux, 491 u8 dpcd[DP_RECEIVER_CAP_SIZE]); 492 493 int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, 494 u8 status[DP_LINK_STATUS_SIZE]); 495 496 int drm_dp_dpcd_read_phy_link_status(struct drm_dp_aux *aux, 497 enum drm_dp_phy dp_phy, 498 u8 link_status[DP_LINK_STATUS_SIZE]); 499 500 bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux, 501 u8 real_edid_checksum); 502 503 int drm_dp_read_downstream_info(struct drm_dp_aux *aux, 504 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 505 u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS]); 506 bool drm_dp_downstream_is_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 507 const u8 port_cap[4], u8 type); 508 bool drm_dp_downstream_is_tmds(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 509 const u8 port_cap[4], 510 const struct drm_edid *drm_edid); 511 int drm_dp_downstream_max_dotclock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 512 const u8 port_cap[4]); 513 int drm_dp_downstream_max_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 514 const u8 port_cap[4], 515 const struct drm_edid *drm_edid); 516 int drm_dp_downstream_min_tmds_clock(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 517 const u8 port_cap[4], 518 const struct drm_edid *drm_edid); 519 int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 520 const u8 port_cap[4], 521 const struct drm_edid *drm_edid); 522 bool drm_dp_downstream_420_passthrough(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 523 const u8 port_cap[4]); 524 bool drm_dp_downstream_444_to_420_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 525 const u8 port_cap[4]); 526 struct drm_display_mode *drm_dp_downstream_mode(struct drm_device *dev, 527 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 528 const u8 port_cap[4]); 529 int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]); 530 void drm_dp_downstream_debug(struct seq_file *m, 531 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 532 const u8 port_cap[4], 533 const struct drm_edid *drm_edid, 534 struct drm_dp_aux *aux); 535 enum drm_mode_subconnector 536 drm_dp_subconnector_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 537 const u8 port_cap[4]); 538 void drm_dp_set_subconnector_property(struct drm_connector *connector, 539 enum drm_connector_status status, 540 const u8 *dpcd, 541 const u8 port_cap[4]); 542 543 struct drm_dp_desc; 544 bool drm_dp_read_sink_count_cap(struct drm_connector *connector, 545 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 546 const struct drm_dp_desc *desc); 547 int drm_dp_read_sink_count(struct drm_dp_aux *aux); 548 549 int drm_dp_read_lttpr_common_caps(struct drm_dp_aux *aux, 550 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 551 u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); 552 int drm_dp_read_lttpr_phy_caps(struct drm_dp_aux *aux, 553 const u8 dpcd[DP_RECEIVER_CAP_SIZE], 554 enum drm_dp_phy dp_phy, 555 u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 556 int drm_dp_lttpr_count(const u8 cap[DP_LTTPR_COMMON_CAP_SIZE]); 557 int drm_dp_lttpr_max_link_rate(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); 558 int drm_dp_lttpr_max_lane_count(const u8 caps[DP_LTTPR_COMMON_CAP_SIZE]); 559 bool drm_dp_lttpr_voltage_swing_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 560 bool drm_dp_lttpr_pre_emphasis_level_3_supported(const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); 561 562 void drm_dp_remote_aux_init(struct drm_dp_aux *aux); 563 void drm_dp_aux_init(struct drm_dp_aux *aux); 564 int drm_dp_aux_register(struct drm_dp_aux *aux); 565 void drm_dp_aux_unregister(struct drm_dp_aux *aux); 566 567 int drm_dp_start_crc(struct drm_dp_aux *aux, struct drm_crtc *crtc); 568 int drm_dp_stop_crc(struct drm_dp_aux *aux); 569 570 struct drm_dp_dpcd_ident { 571 u8 oui[3]; 572 u8 device_id[6]; 573 u8 hw_rev; 574 u8 sw_major_rev; 575 u8 sw_minor_rev; 576 } __packed; 577 578 /** 579 * struct drm_dp_desc - DP branch/sink device descriptor 580 * @ident: DP device identification from DPCD 0x400 (sink) or 0x500 (branch). 581 * @quirks: Quirks; use drm_dp_has_quirk() to query for the quirks. 582 */ 583 struct drm_dp_desc { 584 struct drm_dp_dpcd_ident ident; 585 u32 quirks; 586 }; 587 588 int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc, 589 bool is_branch); 590 591 /** 592 * enum drm_dp_quirk - Display Port sink/branch device specific quirks 593 * 594 * Display Port sink and branch devices in the wild have a variety of bugs, try 595 * to collect them here. The quirks are shared, but it's up to the drivers to 596 * implement workarounds for them. 597 */ 598 enum drm_dp_quirk { 599 /** 600 * @DP_DPCD_QUIRK_CONSTANT_N: 601 * 602 * The device requires main link attributes Mvid and Nvid to be limited 603 * to 16 bits. So will give a constant value (0x8000) for compatability. 604 */ 605 DP_DPCD_QUIRK_CONSTANT_N, 606 /** 607 * @DP_DPCD_QUIRK_NO_PSR: 608 * 609 * The device does not support PSR even if reports that it supports or 610 * driver still need to implement proper handling for such device. 611 */ 612 DP_DPCD_QUIRK_NO_PSR, 613 /** 614 * @DP_DPCD_QUIRK_NO_SINK_COUNT: 615 * 616 * The device does not set SINK_COUNT to a non-zero value. 617 * The driver should ignore SINK_COUNT during detection. Note that 618 * drm_dp_read_sink_count_cap() automatically checks for this quirk. 619 */ 620 DP_DPCD_QUIRK_NO_SINK_COUNT, 621 /** 622 * @DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD: 623 * 624 * The device supports MST DSC despite not supporting Virtual DPCD. 625 * The DSC caps can be read from the physical aux instead. 626 */ 627 DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD, 628 /** 629 * @DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS: 630 * 631 * The device supports a link rate of 3.24 Gbps (multiplier 0xc) despite 632 * the DP_MAX_LINK_RATE register reporting a lower max multiplier. 633 */ 634 DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS, 635 }; 636 637 /** 638 * drm_dp_has_quirk() - does the DP device have a specific quirk 639 * @desc: Device descriptor filled by drm_dp_read_desc() 640 * @quirk: Quirk to query for 641 * 642 * Return true if DP device identified by @desc has @quirk. 643 */ 644 static inline bool 645 drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk) 646 { 647 return desc->quirks & BIT(quirk); 648 } 649 650 /** 651 * struct drm_edp_backlight_info - Probed eDP backlight info struct 652 * @pwmgen_bit_count: The pwmgen bit count 653 * @pwm_freq_pre_divider: The PWM frequency pre-divider value being used for this backlight, if any 654 * @max: The maximum backlight level that may be set 655 * @lsb_reg_used: Do we also write values to the DP_EDP_BACKLIGHT_BRIGHTNESS_LSB register? 656 * @aux_enable: Does the panel support the AUX enable cap? 657 * @aux_set: Does the panel support setting the brightness through AUX? 658 * 659 * This structure contains various data about an eDP backlight, which can be populated by using 660 * drm_edp_backlight_init(). 661 */ 662 struct drm_edp_backlight_info { 663 u8 pwmgen_bit_count; 664 u8 pwm_freq_pre_divider; 665 u16 max; 666 667 bool lsb_reg_used : 1; 668 bool aux_enable : 1; 669 bool aux_set : 1; 670 }; 671 672 int 673 drm_edp_backlight_init(struct drm_dp_aux *aux, struct drm_edp_backlight_info *bl, 674 u16 driver_pwm_freq_hz, const u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE], 675 u16 *current_level, u8 *current_mode); 676 int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl, 677 u16 level); 678 int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl, 679 u16 level); 680 int drm_edp_backlight_disable(struct drm_dp_aux *aux, const struct drm_edp_backlight_info *bl); 681 682 #if IS_ENABLED(CONFIG_DRM_KMS_HELPER) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \ 683 (IS_MODULE(CONFIG_DRM_KMS_HELPER) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE))) 684 685 int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux); 686 687 #else 688 689 static inline int drm_panel_dp_aux_backlight(struct drm_panel *panel, 690 struct drm_dp_aux *aux) 691 { 692 return 0; 693 } 694 695 #endif 696 697 #ifdef CONFIG_DRM_DP_CEC 698 void drm_dp_cec_irq(struct drm_dp_aux *aux); 699 void drm_dp_cec_register_connector(struct drm_dp_aux *aux, 700 struct drm_connector *connector); 701 void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux); 702 void drm_dp_cec_attach(struct drm_dp_aux *aux, u16 source_physical_address); 703 void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid); 704 void drm_dp_cec_unset_edid(struct drm_dp_aux *aux); 705 #else 706 static inline void drm_dp_cec_irq(struct drm_dp_aux *aux) 707 { 708 } 709 710 static inline void 711 drm_dp_cec_register_connector(struct drm_dp_aux *aux, 712 struct drm_connector *connector) 713 { 714 } 715 716 static inline void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux) 717 { 718 } 719 720 static inline void drm_dp_cec_attach(struct drm_dp_aux *aux, 721 u16 source_physical_address) 722 { 723 } 724 725 static inline void drm_dp_cec_set_edid(struct drm_dp_aux *aux, 726 const struct edid *edid) 727 { 728 } 729 730 static inline void drm_dp_cec_unset_edid(struct drm_dp_aux *aux) 731 { 732 } 733 734 #endif 735 736 /** 737 * struct drm_dp_phy_test_params - DP Phy Compliance parameters 738 * @link_rate: Requested Link rate from DPCD 0x219 739 * @num_lanes: Number of lanes requested by sing through DPCD 0x220 740 * @phy_pattern: DP Phy test pattern from DPCD 0x248 741 * @hbr2_reset: DP HBR2_COMPLIANCE_SCRAMBLER_RESET from DCPD 0x24A and 0x24B 742 * @custom80: DP Test_80BIT_CUSTOM_PATTERN from DPCDs 0x250 through 0x259 743 * @enhanced_frame_cap: flag for enhanced frame capability. 744 */ 745 struct drm_dp_phy_test_params { 746 int link_rate; 747 u8 num_lanes; 748 u8 phy_pattern; 749 u8 hbr2_reset[2]; 750 u8 custom80[10]; 751 bool enhanced_frame_cap; 752 }; 753 754 int drm_dp_get_phy_test_pattern(struct drm_dp_aux *aux, 755 struct drm_dp_phy_test_params *data); 756 int drm_dp_set_phy_test_pattern(struct drm_dp_aux *aux, 757 struct drm_dp_phy_test_params *data, u8 dp_rev); 758 int drm_dp_get_pcon_max_frl_bw(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 759 const u8 port_cap[4]); 760 int drm_dp_pcon_frl_prepare(struct drm_dp_aux *aux, bool enable_frl_ready_hpd); 761 bool drm_dp_pcon_is_frl_ready(struct drm_dp_aux *aux); 762 int drm_dp_pcon_frl_configure_1(struct drm_dp_aux *aux, int max_frl_gbps, 763 u8 frl_mode); 764 int drm_dp_pcon_frl_configure_2(struct drm_dp_aux *aux, int max_frl_mask, 765 u8 frl_type); 766 int drm_dp_pcon_reset_frl_config(struct drm_dp_aux *aux); 767 int drm_dp_pcon_frl_enable(struct drm_dp_aux *aux); 768 769 bool drm_dp_pcon_hdmi_link_active(struct drm_dp_aux *aux); 770 int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux *aux, u8 *frl_trained_mask); 771 void drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux, 772 struct drm_connector *connector); 773 bool drm_dp_pcon_enc_is_dsc_1_2(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 774 int drm_dp_pcon_dsc_max_slices(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 775 int drm_dp_pcon_dsc_max_slice_width(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 776 int drm_dp_pcon_dsc_bpp_incr(const u8 pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]); 777 int drm_dp_pcon_pps_default(struct drm_dp_aux *aux); 778 int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128]); 779 int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6]); 780 bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 dpcd[DP_RECEIVER_CAP_SIZE], 781 const u8 port_cap[4], u8 color_spc); 782 int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc); 783 784 #endif /* _DRM_DP_HELPER_H_ */ 785