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 /* disable EoT packets in HS mode */ 134 #define MIPI_DSI_MODE_NO_EOT_PACKET BIT(9) 135 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */ 136 #define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10) 137 /* transmit data in low power */ 138 #define MIPI_DSI_MODE_LPM BIT(11) 139 /* transmit data ending at the same time for all lanes within one hsync */ 140 #define MIPI_DSI_HS_PKT_END_ALIGNED BIT(12) 141 142 enum mipi_dsi_pixel_format { 143 MIPI_DSI_FMT_RGB888, 144 MIPI_DSI_FMT_RGB666, 145 MIPI_DSI_FMT_RGB666_PACKED, 146 MIPI_DSI_FMT_RGB565, 147 }; 148 149 #define DSI_DEV_NAME_SIZE 20 150 151 /** 152 * struct mipi_dsi_device_info - template for creating a mipi_dsi_device 153 * @type: DSI peripheral chip type 154 * @channel: DSI virtual channel assigned to peripheral 155 * @node: pointer to OF device node or NULL 156 * 157 * This is populated and passed to mipi_dsi_device_new to create a new 158 * DSI device 159 */ 160 struct mipi_dsi_device_info { 161 char type[DSI_DEV_NAME_SIZE]; 162 u32 channel; 163 struct device_node *node; 164 }; 165 166 /** 167 * struct mipi_dsi_device - DSI peripheral device 168 * @host: DSI host for this peripheral 169 * @dev: driver model device node for this peripheral 170 * @attached: the DSI device has been successfully attached 171 * @name: DSI peripheral chip type 172 * @channel: virtual channel assigned to the peripheral 173 * @format: pixel format for video mode 174 * @lanes: number of active data lanes 175 * @mode_flags: DSI operation mode related flags 176 * @hs_rate: maximum lane frequency for high speed mode in hertz, this should 177 * be set to the real limits of the hardware, zero is only accepted for 178 * legacy drivers 179 * @lp_rate: maximum lane frequency for low power mode in hertz, this should 180 * be set to the real limits of the hardware, zero is only accepted for 181 * legacy drivers 182 * @dsc: panel/bridge DSC pps payload to be sent 183 */ 184 struct mipi_dsi_device { 185 struct mipi_dsi_host *host; 186 struct device dev; 187 bool attached; 188 189 char name[DSI_DEV_NAME_SIZE]; 190 unsigned int channel; 191 unsigned int lanes; 192 enum mipi_dsi_pixel_format format; 193 unsigned long mode_flags; 194 unsigned long hs_rate; 195 unsigned long lp_rate; 196 struct drm_dsc_config *dsc; 197 }; 198 199 /** 200 * struct mipi_dsi_multi_context - Context to call multiple MIPI DSI funcs in a row 201 */ 202 struct mipi_dsi_multi_context { 203 /** 204 * @dsi: Pointer to the MIPI DSI device 205 */ 206 struct mipi_dsi_device *dsi; 207 208 /** 209 * @accum_err: Storage for the accumulated error over the multiple calls 210 * 211 * Init to 0. If a function encounters an error then the error code 212 * will be stored here. If you call a function and this points to a 213 * non-zero value then the function will be a noop. This allows calling 214 * a function many times in a row and just checking the error at the 215 * end to see if any of them failed. 216 */ 217 int accum_err; 218 }; 219 220 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:" 221 222 #define to_mipi_dsi_device(__dev) container_of_const(__dev, struct mipi_dsi_device, dev) 223 224 /** 225 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any 226 * given pixel format defined by the MIPI DSI 227 * specification 228 * @fmt: MIPI DSI pixel format 229 * 230 * Returns: The number of bits per pixel of the given pixel format. 231 */ 232 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt) 233 { 234 switch (fmt) { 235 case MIPI_DSI_FMT_RGB888: 236 case MIPI_DSI_FMT_RGB666: 237 return 24; 238 239 case MIPI_DSI_FMT_RGB666_PACKED: 240 return 18; 241 242 case MIPI_DSI_FMT_RGB565: 243 return 16; 244 } 245 246 return -EINVAL; 247 } 248 249 enum mipi_dsi_compression_algo { 250 MIPI_DSI_COMPRESSION_DSC = 0, 251 MIPI_DSI_COMPRESSION_VENDOR = 3, 252 /* other two values are reserved, DSI 1.3 */ 253 }; 254 255 struct mipi_dsi_device * 256 mipi_dsi_device_register_full(struct mipi_dsi_host *host, 257 const struct mipi_dsi_device_info *info); 258 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi); 259 struct mipi_dsi_device * 260 devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host, 261 const struct mipi_dsi_device_info *info); 262 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np); 263 int mipi_dsi_attach(struct mipi_dsi_device *dsi); 264 int mipi_dsi_detach(struct mipi_dsi_device *dsi); 265 int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi); 266 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi); 267 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi); 268 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, 269 u16 value); 270 int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable); 271 int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable, 272 enum mipi_dsi_compression_algo algo, 273 unsigned int pps_selector); 274 int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi, 275 const struct drm_dsc_picture_parameter_set *pps); 276 277 void mipi_dsi_compression_mode_ext_multi(struct mipi_dsi_multi_context *ctx, 278 bool enable, 279 enum mipi_dsi_compression_algo algo, 280 unsigned int pps_selector); 281 void mipi_dsi_compression_mode_multi(struct mipi_dsi_multi_context *ctx, 282 bool enable); 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 u32 drm_mipi_dsi_get_input_bus_fmt(enum mipi_dsi_pixel_format dsi_format); 295 296 #define mipi_dsi_msleep(ctx, delay) \ 297 do { \ 298 if (!(ctx)->accum_err) \ 299 msleep(delay); \ 300 } while (0) 301 302 #define mipi_dsi_usleep_range(ctx, min, max) \ 303 do { \ 304 if (!(ctx)->accum_err) \ 305 usleep_range(min, max); \ 306 } while (0) 307 308 /** 309 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode 310 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking 311 * information only 312 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both 313 * V-Blanking and H-Blanking information 314 */ 315 enum mipi_dsi_dcs_tear_mode { 316 MIPI_DSI_DCS_TEAR_MODE_VBLANK, 317 MIPI_DSI_DCS_TEAR_MODE_VHBLANK, 318 }; 319 320 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2) 321 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3) 322 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4) 323 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5) 324 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6) 325 326 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, 327 const void *data, size_t len); 328 int mipi_dsi_dcs_write_buffer_chatty(struct mipi_dsi_device *dsi, 329 const void *data, size_t len); 330 void mipi_dsi_dcs_write_buffer_multi(struct mipi_dsi_multi_context *ctx, 331 const void *data, size_t len); 332 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, 333 const void *data, size_t len); 334 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, 335 size_t len); 336 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi); 337 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi); 338 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode); 339 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format); 340 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi); 341 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi); 342 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi); 343 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi); 344 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, 345 u16 end); 346 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, 347 u16 end); 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 void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx); 381 382 /** 383 * mipi_dsi_generic_write_seq - transmit data using a generic write packet 384 * 385 * This macro will print errors for you and will RETURN FROM THE CALLING 386 * FUNCTION (yes this is non-intuitive) upon error. 387 * 388 * Because of the non-intuitive return behavior, THIS MACRO IS DEPRECATED. 389 * Please replace calls of it with mipi_dsi_generic_write_seq_multi(). 390 * 391 * @dsi: DSI peripheral device 392 * @seq: buffer containing the payload 393 */ 394 #define mipi_dsi_generic_write_seq(dsi, seq...) \ 395 do { \ 396 static const u8 d[] = { seq }; \ 397 int ret; \ 398 ret = mipi_dsi_generic_write_chatty(dsi, d, ARRAY_SIZE(d)); \ 399 if (ret < 0) \ 400 return ret; \ 401 } while (0) 402 403 /** 404 * mipi_dsi_generic_write_seq_multi - transmit data using a generic write packet 405 * 406 * This macro will print errors for you and error handling is optimized for 407 * callers that call this multiple times in a row. 408 * 409 * @ctx: Context for multiple DSI transactions 410 * @seq: buffer containing the payload 411 */ 412 #define mipi_dsi_generic_write_seq_multi(ctx, seq...) \ 413 do { \ 414 static const u8 d[] = { seq }; \ 415 mipi_dsi_generic_write_multi(ctx, d, ARRAY_SIZE(d)); \ 416 } while (0) 417 418 /** 419 * mipi_dsi_dcs_write_seq_multi - transmit a DCS command with payload 420 * 421 * This macro will print errors for you and error handling is optimized for 422 * callers that call this multiple times in a row. 423 * 424 * @ctx: Context for multiple DSI transactions 425 * @cmd: Command 426 * @seq: buffer containing data to be transmitted 427 */ 428 #define mipi_dsi_dcs_write_seq_multi(ctx, cmd, seq...) \ 429 do { \ 430 static const u8 d[] = { cmd, seq }; \ 431 mipi_dsi_dcs_write_buffer_multi(ctx, d, ARRAY_SIZE(d)); \ 432 } while (0) 433 434 /** 435 * struct mipi_dsi_driver - DSI driver 436 * @driver: device driver model driver 437 * @probe: callback for device binding 438 * @remove: callback for device unbinding 439 * @shutdown: called at shutdown time to quiesce the device 440 */ 441 struct mipi_dsi_driver { 442 struct device_driver driver; 443 int(*probe)(struct mipi_dsi_device *dsi); 444 void (*remove)(struct mipi_dsi_device *dsi); 445 void (*shutdown)(struct mipi_dsi_device *dsi); 446 }; 447 448 static inline struct mipi_dsi_driver * 449 to_mipi_dsi_driver(struct device_driver *driver) 450 { 451 return container_of(driver, struct mipi_dsi_driver, driver); 452 } 453 454 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi) 455 { 456 return dev_get_drvdata(&dsi->dev); 457 } 458 459 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data) 460 { 461 dev_set_drvdata(&dsi->dev, data); 462 } 463 464 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver, 465 struct module *owner); 466 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver); 467 468 #define mipi_dsi_driver_register(driver) \ 469 mipi_dsi_driver_register_full(driver, THIS_MODULE) 470 471 #define module_mipi_dsi_driver(__mipi_dsi_driver) \ 472 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \ 473 mipi_dsi_driver_unregister) 474 475 #endif /* __DRM_MIPI_DSI__ */ 476