1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * MIPI DSI Bus 4 * 5 * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd. 6 * Andrzej Hajda <a.hajda@samsung.com> 7 */ 8 9 #ifndef __DRM_MIPI_DSI_H__ 10 #define __DRM_MIPI_DSI_H__ 11 12 #include <linux/device.h> 13 #include <linux/delay.h> 14 15 struct mipi_dsi_host; 16 struct mipi_dsi_device; 17 struct drm_dsc_picture_parameter_set; 18 19 /* request ACK from peripheral */ 20 #define MIPI_DSI_MSG_REQ_ACK BIT(0) 21 /* use Low Power Mode to transmit message */ 22 #define MIPI_DSI_MSG_USE_LPM BIT(1) 23 24 /** 25 * struct mipi_dsi_msg - read/write DSI buffer 26 * @channel: virtual channel id 27 * @type: payload data type 28 * @flags: flags controlling this message transmission 29 * @tx_len: length of @tx_buf 30 * @tx_buf: data to be written 31 * @rx_len: length of @rx_buf 32 * @rx_buf: data to be read, or NULL 33 */ 34 struct mipi_dsi_msg { 35 u8 channel; 36 u8 type; 37 u16 flags; 38 39 size_t tx_len; 40 const void *tx_buf; 41 42 size_t rx_len; 43 void *rx_buf; 44 }; 45 46 bool mipi_dsi_packet_format_is_short(u8 type); 47 bool mipi_dsi_packet_format_is_long(u8 type); 48 49 /** 50 * struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format 51 * @size: size (in bytes) of the packet 52 * @header: the four bytes that make up the header (Data ID, Word Count or 53 * Packet Data, and ECC) 54 * @payload_length: number of bytes in the payload 55 * @payload: a pointer to a buffer containing the payload, if any 56 */ 57 struct mipi_dsi_packet { 58 size_t size; 59 u8 header[4]; 60 size_t payload_length; 61 const u8 *payload; 62 }; 63 64 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet, 65 const struct mipi_dsi_msg *msg); 66 67 /** 68 * struct mipi_dsi_host_ops - DSI bus operations 69 * @attach: attach DSI device to DSI host 70 * @detach: detach DSI device from DSI host 71 * @transfer: transmit a DSI packet 72 * 73 * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg 74 * structures. This structure contains information about the type of packet 75 * being transmitted as well as the transmit and receive buffers. When an 76 * error is encountered during transmission, this function will return a 77 * negative error code. On success it shall return the number of bytes 78 * transmitted for write packets or the number of bytes received for read 79 * packets. 80 * 81 * Note that typically DSI packet transmission is atomic, so the .transfer() 82 * function will seldomly return anything other than the number of bytes 83 * contained in the transmit buffer on success. 84 * 85 * Also note that those callbacks can be called no matter the state the 86 * host is in. Drivers that need the underlying device to be powered to 87 * perform these operations will first need to make sure it's been 88 * properly enabled. 89 */ 90 struct mipi_dsi_host_ops { 91 int (*attach)(struct mipi_dsi_host *host, 92 struct mipi_dsi_device *dsi); 93 int (*detach)(struct mipi_dsi_host *host, 94 struct mipi_dsi_device *dsi); 95 ssize_t (*transfer)(struct mipi_dsi_host *host, 96 const struct mipi_dsi_msg *msg); 97 }; 98 99 /** 100 * struct mipi_dsi_host - DSI host device 101 * @dev: driver model device node for this DSI host 102 * @ops: DSI host operations 103 * @list: list management 104 */ 105 struct mipi_dsi_host { 106 struct device *dev; 107 const struct mipi_dsi_host_ops *ops; 108 struct list_head list; 109 }; 110 111 int mipi_dsi_host_register(struct mipi_dsi_host *host); 112 void mipi_dsi_host_unregister(struct mipi_dsi_host *host); 113 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node); 114 115 /* DSI mode flags */ 116 117 /* video mode */ 118 #define MIPI_DSI_MODE_VIDEO BIT(0) 119 /* video burst mode */ 120 #define MIPI_DSI_MODE_VIDEO_BURST BIT(1) 121 /* video pulse mode */ 122 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2) 123 /* enable auto vertical count mode */ 124 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3) 125 /* enable hsync-end packets in vsync-pulse and v-porch area */ 126 #define MIPI_DSI_MODE_VIDEO_HSE BIT(4) 127 /* disable hfront-porch area */ 128 #define MIPI_DSI_MODE_VIDEO_NO_HFP BIT(5) 129 /* disable hback-porch area */ 130 #define MIPI_DSI_MODE_VIDEO_NO_HBP BIT(6) 131 /* disable hsync-active area */ 132 #define MIPI_DSI_MODE_VIDEO_NO_HSA BIT(7) 133 /* flush display FIFO on vsync pulse */ 134 #define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8) 135 /* disable EoT packets in HS mode */ 136 #define MIPI_DSI_MODE_NO_EOT_PACKET BIT(9) 137 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */ 138 #define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10) 139 /* transmit data in low power */ 140 #define MIPI_DSI_MODE_LPM BIT(11) 141 /* transmit data ending at the same time for all lanes within one hsync */ 142 #define MIPI_DSI_HS_PKT_END_ALIGNED BIT(12) 143 144 enum mipi_dsi_pixel_format { 145 MIPI_DSI_FMT_RGB888, 146 MIPI_DSI_FMT_RGB666, 147 MIPI_DSI_FMT_RGB666_PACKED, 148 MIPI_DSI_FMT_RGB565, 149 }; 150 151 #define DSI_DEV_NAME_SIZE 20 152 153 /** 154 * struct mipi_dsi_device_info - template for creating a mipi_dsi_device 155 * @type: DSI peripheral chip type 156 * @channel: DSI virtual channel assigned to peripheral 157 * @node: pointer to OF device node or NULL 158 * 159 * This is populated and passed to mipi_dsi_device_new to create a new 160 * DSI device 161 */ 162 struct mipi_dsi_device_info { 163 char type[DSI_DEV_NAME_SIZE]; 164 u32 channel; 165 struct device_node *node; 166 }; 167 168 /** 169 * struct mipi_dsi_device - DSI peripheral device 170 * @host: DSI host for this peripheral 171 * @dev: driver model device node for this peripheral 172 * @attached: the DSI device has been successfully attached 173 * @name: DSI peripheral chip type 174 * @channel: virtual channel assigned to the peripheral 175 * @format: pixel format for video mode 176 * @lanes: number of active data lanes 177 * @mode_flags: DSI operation mode related flags 178 * @hs_rate: maximum lane frequency for high speed mode in hertz, this should 179 * be set to the real limits of the hardware, zero is only accepted for 180 * legacy drivers 181 * @lp_rate: maximum lane frequency for low power mode in hertz, this should 182 * be set to the real limits of the hardware, zero is only accepted for 183 * legacy drivers 184 * @dsc: panel/bridge DSC pps payload to be sent 185 */ 186 struct mipi_dsi_device { 187 struct mipi_dsi_host *host; 188 struct device dev; 189 bool attached; 190 191 char name[DSI_DEV_NAME_SIZE]; 192 unsigned int channel; 193 unsigned int lanes; 194 enum mipi_dsi_pixel_format format; 195 unsigned long mode_flags; 196 unsigned long hs_rate; 197 unsigned long lp_rate; 198 struct drm_dsc_config *dsc; 199 }; 200 201 /** 202 * struct mipi_dsi_multi_context - Context to call multiple MIPI DSI funcs in a row 203 */ 204 struct mipi_dsi_multi_context { 205 /** 206 * @dsi: Pointer to the MIPI DSI device 207 */ 208 struct mipi_dsi_device *dsi; 209 210 /** 211 * @accum_err: Storage for the accumulated error over the multiple calls 212 * 213 * Init to 0. If a function encounters an error then the error code 214 * will be stored here. If you call a function and this points to a 215 * non-zero value then the function will be a noop. This allows calling 216 * a function many times in a row and just checking the error at the 217 * end to see if any of them failed. 218 */ 219 int accum_err; 220 }; 221 222 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:" 223 224 #define to_mipi_dsi_device(__dev) container_of_const(__dev, struct mipi_dsi_device, dev) 225 226 /** 227 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any 228 * given pixel format defined by the MIPI DSI 229 * specification 230 * @fmt: MIPI DSI pixel format 231 * 232 * Returns: The number of bits per pixel of the given pixel format. 233 */ mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)234 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt) 235 { 236 switch (fmt) { 237 case MIPI_DSI_FMT_RGB888: 238 case MIPI_DSI_FMT_RGB666: 239 return 24; 240 241 case MIPI_DSI_FMT_RGB666_PACKED: 242 return 18; 243 244 case MIPI_DSI_FMT_RGB565: 245 return 16; 246 } 247 248 return -EINVAL; 249 } 250 251 enum mipi_dsi_compression_algo { 252 MIPI_DSI_COMPRESSION_DSC = 0, 253 MIPI_DSI_COMPRESSION_VENDOR = 3, 254 /* other two values are reserved, DSI 1.3 */ 255 }; 256 257 struct mipi_dsi_device * 258 mipi_dsi_device_register_full(struct mipi_dsi_host *host, 259 const struct mipi_dsi_device_info *info); 260 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi); 261 struct mipi_dsi_device * 262 devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host, 263 const struct mipi_dsi_device_info *info); 264 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np); 265 int mipi_dsi_attach(struct mipi_dsi_device *dsi); 266 int mipi_dsi_detach(struct mipi_dsi_device *dsi); 267 int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi); 268 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi); 269 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi); 270 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, 271 u16 value); 272 int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable); 273 int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable, 274 enum mipi_dsi_compression_algo algo, 275 unsigned int pps_selector); 276 int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi, 277 const struct drm_dsc_picture_parameter_set *pps); 278 279 void mipi_dsi_compression_mode_ext_multi(struct mipi_dsi_multi_context *ctx, 280 bool enable, 281 enum mipi_dsi_compression_algo algo, 282 unsigned int pps_selector); 283 void mipi_dsi_picture_parameter_set_multi(struct mipi_dsi_multi_context *ctx, 284 const struct drm_dsc_picture_parameter_set *pps); 285 286 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload, 287 size_t size); 288 int mipi_dsi_generic_write_chatty(struct mipi_dsi_device *dsi, 289 const void *payload, size_t size); 290 void mipi_dsi_generic_write_multi(struct mipi_dsi_multi_context *ctx, 291 const void *payload, size_t size); 292 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params, 293 size_t num_params, void *data, size_t size); 294 295 #define mipi_dsi_msleep(ctx, delay) \ 296 do { \ 297 if (!(ctx)->accum_err) \ 298 msleep(delay); \ 299 } while (0) 300 301 #define mipi_dsi_usleep_range(ctx, min, max) \ 302 do { \ 303 if (!(ctx)->accum_err) \ 304 usleep_range(min, max); \ 305 } while (0) 306 307 /** 308 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode 309 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking 310 * information only 311 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both 312 * V-Blanking and H-Blanking information 313 */ 314 enum mipi_dsi_dcs_tear_mode { 315 MIPI_DSI_DCS_TEAR_MODE_VBLANK, 316 MIPI_DSI_DCS_TEAR_MODE_VHBLANK, 317 }; 318 319 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2) 320 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3) 321 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4) 322 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5) 323 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6) 324 325 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, 326 const void *data, size_t len); 327 int mipi_dsi_dcs_write_buffer_chatty(struct mipi_dsi_device *dsi, 328 const void *data, size_t len); 329 void mipi_dsi_dcs_write_buffer_multi(struct mipi_dsi_multi_context *ctx, 330 const void *data, size_t len); 331 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, 332 const void *data, size_t len); 333 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, 334 size_t len); 335 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi); 336 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi); 337 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode); 338 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format); 339 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi); 340 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi); 341 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi); 342 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi); 343 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, 344 u16 end); 345 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, 346 u16 end); 347 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi); 348 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, 349 enum mipi_dsi_dcs_tear_mode mode); 350 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format); 351 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline); 352 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, 353 u16 brightness); 354 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, 355 u16 *brightness); 356 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi, 357 u16 brightness); 358 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi, 359 u16 *brightness); 360 361 void mipi_dsi_dcs_nop_multi(struct mipi_dsi_multi_context *ctx); 362 void mipi_dsi_dcs_enter_sleep_mode_multi(struct mipi_dsi_multi_context *ctx); 363 void mipi_dsi_dcs_exit_sleep_mode_multi(struct mipi_dsi_multi_context *ctx); 364 void mipi_dsi_dcs_set_display_off_multi(struct mipi_dsi_multi_context *ctx); 365 void mipi_dsi_dcs_set_display_on_multi(struct mipi_dsi_multi_context *ctx); 366 void mipi_dsi_dcs_set_tear_on_multi(struct mipi_dsi_multi_context *ctx, 367 enum mipi_dsi_dcs_tear_mode mode); 368 void mipi_dsi_turn_on_peripheral_multi(struct mipi_dsi_multi_context *ctx); 369 void mipi_dsi_dcs_soft_reset_multi(struct mipi_dsi_multi_context *ctx); 370 void mipi_dsi_dcs_set_display_brightness_multi(struct mipi_dsi_multi_context *ctx, 371 u16 brightness); 372 void mipi_dsi_dcs_set_pixel_format_multi(struct mipi_dsi_multi_context *ctx, 373 u8 format); 374 void mipi_dsi_dcs_set_column_address_multi(struct mipi_dsi_multi_context *ctx, 375 u16 start, u16 end); 376 void mipi_dsi_dcs_set_page_address_multi(struct mipi_dsi_multi_context *ctx, 377 u16 start, u16 end); 378 void mipi_dsi_dcs_set_tear_scanline_multi(struct mipi_dsi_multi_context *ctx, 379 u16 scanline); 380 381 /** 382 * mipi_dsi_generic_write_seq - transmit data using a generic write packet 383 * 384 * This macro will print errors for you and will RETURN FROM THE CALLING 385 * FUNCTION (yes this is non-intuitive) upon error. 386 * 387 * Because of the non-intuitive return behavior, THIS MACRO IS DEPRECATED. 388 * Please replace calls of it with mipi_dsi_generic_write_seq_multi(). 389 * 390 * @dsi: DSI peripheral device 391 * @seq: buffer containing the payload 392 */ 393 #define mipi_dsi_generic_write_seq(dsi, seq...) \ 394 do { \ 395 static const u8 d[] = { seq }; \ 396 int ret; \ 397 ret = mipi_dsi_generic_write_chatty(dsi, d, ARRAY_SIZE(d)); \ 398 if (ret < 0) \ 399 return ret; \ 400 } while (0) 401 402 /** 403 * mipi_dsi_generic_write_seq_multi - transmit data using a generic write packet 404 * 405 * This macro will print errors for you and error handling is optimized for 406 * callers that call this multiple times in a row. 407 * 408 * @ctx: Context for multiple DSI transactions 409 * @seq: buffer containing the payload 410 */ 411 #define mipi_dsi_generic_write_seq_multi(ctx, seq...) \ 412 do { \ 413 static const u8 d[] = { seq }; \ 414 mipi_dsi_generic_write_multi(ctx, d, ARRAY_SIZE(d)); \ 415 } while (0) 416 417 /** 418 * mipi_dsi_dcs_write_seq - transmit a DCS command with payload 419 * 420 * This macro will print errors for you and will RETURN FROM THE CALLING 421 * FUNCTION (yes this is non-intuitive) upon error. 422 * 423 * Because of the non-intuitive return behavior, THIS MACRO IS DEPRECATED. 424 * Please replace calls of it with mipi_dsi_dcs_write_seq_multi(). 425 * 426 * @dsi: DSI peripheral device 427 * @cmd: Command 428 * @seq: buffer containing data to be transmitted 429 */ 430 #define mipi_dsi_dcs_write_seq(dsi, cmd, seq...) \ 431 do { \ 432 static const u8 d[] = { cmd, seq }; \ 433 int ret; \ 434 ret = mipi_dsi_dcs_write_buffer_chatty(dsi, d, ARRAY_SIZE(d)); \ 435 if (ret < 0) \ 436 return ret; \ 437 } while (0) 438 439 /** 440 * mipi_dsi_dcs_write_seq_multi - transmit a DCS command with payload 441 * 442 * This macro will print errors for you and error handling is optimized for 443 * callers that call this multiple times in a row. 444 * 445 * @ctx: Context for multiple DSI transactions 446 * @cmd: Command 447 * @seq: buffer containing data to be transmitted 448 */ 449 #define mipi_dsi_dcs_write_seq_multi(ctx, cmd, seq...) \ 450 do { \ 451 static const u8 d[] = { cmd, seq }; \ 452 mipi_dsi_dcs_write_buffer_multi(ctx, d, ARRAY_SIZE(d)); \ 453 } while (0) 454 455 /** 456 * struct mipi_dsi_driver - DSI driver 457 * @driver: device driver model driver 458 * @probe: callback for device binding 459 * @remove: callback for device unbinding 460 * @shutdown: called at shutdown time to quiesce the device 461 */ 462 struct mipi_dsi_driver { 463 struct device_driver driver; 464 int(*probe)(struct mipi_dsi_device *dsi); 465 void (*remove)(struct mipi_dsi_device *dsi); 466 void (*shutdown)(struct mipi_dsi_device *dsi); 467 }; 468 469 static inline struct mipi_dsi_driver * to_mipi_dsi_driver(struct device_driver * driver)470 to_mipi_dsi_driver(struct device_driver *driver) 471 { 472 return container_of(driver, struct mipi_dsi_driver, driver); 473 } 474 mipi_dsi_get_drvdata(const struct mipi_dsi_device * dsi)475 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi) 476 { 477 return dev_get_drvdata(&dsi->dev); 478 } 479 mipi_dsi_set_drvdata(struct mipi_dsi_device * dsi,void * data)480 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data) 481 { 482 dev_set_drvdata(&dsi->dev, data); 483 } 484 485 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver, 486 struct module *owner); 487 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver); 488 489 #define mipi_dsi_driver_register(driver) \ 490 mipi_dsi_driver_register_full(driver, THIS_MODULE) 491 492 #define module_mipi_dsi_driver(__mipi_dsi_driver) \ 493 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \ 494 mipi_dsi_driver_unregister) 495 496 #endif /* __DRM_MIPI_DSI__ */ 497