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 extern const struct bus_type mipi_dsi_bus_type;
227 #define dev_is_mipi_dsi(dev) ((dev)->bus == &mipi_dsi_bus_type)
228
229 /**
230 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
231 * given pixel format defined by the MIPI DSI
232 * specification
233 * @fmt: MIPI DSI pixel format
234 *
235 * Returns: The number of bits per pixel of the given pixel format.
236 */
mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)237 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
238 {
239 switch (fmt) {
240 case MIPI_DSI_FMT_RGB888:
241 case MIPI_DSI_FMT_RGB666:
242 return 24;
243
244 case MIPI_DSI_FMT_RGB666_PACKED:
245 return 18;
246
247 case MIPI_DSI_FMT_RGB565:
248 return 16;
249 }
250
251 return -EINVAL;
252 }
253
254 enum mipi_dsi_compression_algo {
255 MIPI_DSI_COMPRESSION_DSC = 0,
256 MIPI_DSI_COMPRESSION_VENDOR = 3,
257 /* other two values are reserved, DSI 1.3 */
258 };
259
260 struct mipi_dsi_device *
261 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
262 const struct mipi_dsi_device_info *info);
263 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
264 struct mipi_dsi_device *
265 devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host,
266 const struct mipi_dsi_device_info *info);
267 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
268 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
269 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
270 int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi);
271 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
272 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
273 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
274 u16 value);
275 int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
276 int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable,
277 enum mipi_dsi_compression_algo algo,
278 unsigned int pps_selector);
279 int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
280 const struct drm_dsc_picture_parameter_set *pps);
281
282 void mipi_dsi_compression_mode_ext_multi(struct mipi_dsi_multi_context *ctx,
283 bool enable,
284 enum mipi_dsi_compression_algo algo,
285 unsigned int pps_selector);
286 void mipi_dsi_compression_mode_multi(struct mipi_dsi_multi_context *ctx,
287 bool enable);
288 void mipi_dsi_picture_parameter_set_multi(struct mipi_dsi_multi_context *ctx,
289 const struct drm_dsc_picture_parameter_set *pps);
290
291 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
292 size_t size);
293 int mipi_dsi_generic_write_chatty(struct mipi_dsi_device *dsi,
294 const void *payload, size_t size);
295 void mipi_dsi_generic_write_multi(struct mipi_dsi_multi_context *ctx,
296 const void *payload, size_t size);
297 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
298 size_t num_params, void *data, size_t size);
299 u32 drm_mipi_dsi_get_input_bus_fmt(enum mipi_dsi_pixel_format dsi_format);
300
301 #define mipi_dsi_msleep(ctx, delay) \
302 do { \
303 if (!(ctx)->accum_err) \
304 msleep(delay); \
305 } while (0)
306
307 #define mipi_dsi_usleep_range(ctx, min, max) \
308 do { \
309 if (!(ctx)->accum_err) \
310 usleep_range(min, max); \
311 } while (0)
312
313 /**
314 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
315 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
316 * information only
317 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
318 * V-Blanking and H-Blanking information
319 */
320 enum mipi_dsi_dcs_tear_mode {
321 MIPI_DSI_DCS_TEAR_MODE_VBLANK,
322 MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
323 };
324
325 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
326 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3)
327 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4)
328 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
329 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6)
330
331 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
332 const void *data, size_t len);
333 int mipi_dsi_dcs_write_buffer_chatty(struct mipi_dsi_device *dsi,
334 const void *data, size_t len);
335 void mipi_dsi_dcs_write_buffer_multi(struct mipi_dsi_multi_context *ctx,
336 const void *data, size_t len);
337 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
338 const void *data, size_t len);
339 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
340 size_t len);
341 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
342 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
343 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
344 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
345 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
346 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
347 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
348 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
349 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
350 u16 end);
351 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
352 u16 end);
353 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
354 enum mipi_dsi_dcs_tear_mode mode);
355 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
356 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
357 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
358 u16 brightness);
359 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
360 u16 *brightness);
361 int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi,
362 u16 brightness);
363 int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi,
364 u16 *brightness);
365
366 void mipi_dsi_dcs_nop_multi(struct mipi_dsi_multi_context *ctx);
367 void mipi_dsi_dcs_enter_sleep_mode_multi(struct mipi_dsi_multi_context *ctx);
368 void mipi_dsi_dcs_exit_sleep_mode_multi(struct mipi_dsi_multi_context *ctx);
369 void mipi_dsi_dcs_set_display_off_multi(struct mipi_dsi_multi_context *ctx);
370 void mipi_dsi_dcs_set_display_on_multi(struct mipi_dsi_multi_context *ctx);
371 void mipi_dsi_dcs_set_tear_on_multi(struct mipi_dsi_multi_context *ctx,
372 enum mipi_dsi_dcs_tear_mode mode);
373 void mipi_dsi_turn_on_peripheral_multi(struct mipi_dsi_multi_context *ctx);
374 void mipi_dsi_dcs_soft_reset_multi(struct mipi_dsi_multi_context *ctx);
375 void mipi_dsi_dcs_set_display_brightness_multi(struct mipi_dsi_multi_context *ctx,
376 u16 brightness);
377 void mipi_dsi_dcs_set_pixel_format_multi(struct mipi_dsi_multi_context *ctx,
378 u8 format);
379 void mipi_dsi_dcs_set_column_address_multi(struct mipi_dsi_multi_context *ctx,
380 u16 start, u16 end);
381 void mipi_dsi_dcs_set_page_address_multi(struct mipi_dsi_multi_context *ctx,
382 u16 start, u16 end);
383 void mipi_dsi_dcs_set_tear_scanline_multi(struct mipi_dsi_multi_context *ctx,
384 u16 scanline);
385 void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx);
386
387 /**
388 * mipi_dsi_generic_write_seq - transmit data using a generic write packet
389 *
390 * This macro will print errors for you and will RETURN FROM THE CALLING
391 * FUNCTION (yes this is non-intuitive) upon error.
392 *
393 * Because of the non-intuitive return behavior, THIS MACRO IS DEPRECATED.
394 * Please replace calls of it with mipi_dsi_generic_write_seq_multi().
395 *
396 * @dsi: DSI peripheral device
397 * @seq: buffer containing the payload
398 */
399 #define mipi_dsi_generic_write_seq(dsi, seq...) \
400 do { \
401 static const u8 d[] = { seq }; \
402 int ret; \
403 ret = mipi_dsi_generic_write_chatty(dsi, d, ARRAY_SIZE(d)); \
404 if (ret < 0) \
405 return ret; \
406 } while (0)
407
408 /**
409 * mipi_dsi_generic_write_seq_multi - transmit data using a generic write packet
410 *
411 * This macro will print errors for you and error handling is optimized for
412 * callers that call this multiple times in a row.
413 *
414 * @ctx: Context for multiple DSI transactions
415 * @seq: buffer containing the payload
416 */
417 #define mipi_dsi_generic_write_seq_multi(ctx, seq...) \
418 do { \
419 static const u8 d[] = { seq }; \
420 mipi_dsi_generic_write_multi(ctx, d, ARRAY_SIZE(d)); \
421 } while (0)
422
423 /**
424 * mipi_dsi_dcs_write_seq_multi - transmit a DCS command with payload
425 *
426 * This macro will print errors for you and error handling is optimized for
427 * callers that call this multiple times in a row.
428 *
429 * @ctx: Context for multiple DSI transactions
430 * @cmd: Command
431 * @seq: buffer containing data to be transmitted
432 */
433 #define mipi_dsi_dcs_write_seq_multi(ctx, cmd, seq...) \
434 do { \
435 static const u8 d[] = { cmd, seq }; \
436 mipi_dsi_dcs_write_buffer_multi(ctx, d, ARRAY_SIZE(d)); \
437 } while (0)
438
439 /**
440 * struct mipi_dsi_driver - DSI driver
441 * @driver: device driver model driver
442 * @probe: callback for device binding
443 * @remove: callback for device unbinding
444 * @shutdown: called at shutdown time to quiesce the device
445 */
446 struct mipi_dsi_driver {
447 struct device_driver driver;
448 int(*probe)(struct mipi_dsi_device *dsi);
449 void (*remove)(struct mipi_dsi_device *dsi);
450 void (*shutdown)(struct mipi_dsi_device *dsi);
451 };
452
453 static inline struct mipi_dsi_driver *
to_mipi_dsi_driver(struct device_driver * driver)454 to_mipi_dsi_driver(struct device_driver *driver)
455 {
456 return container_of(driver, struct mipi_dsi_driver, driver);
457 }
458
mipi_dsi_get_drvdata(const struct mipi_dsi_device * dsi)459 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
460 {
461 return dev_get_drvdata(&dsi->dev);
462 }
463
mipi_dsi_set_drvdata(struct mipi_dsi_device * dsi,void * data)464 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
465 {
466 dev_set_drvdata(&dsi->dev, data);
467 }
468
469 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
470 struct module *owner);
471 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
472
473 #define mipi_dsi_driver_register(driver) \
474 mipi_dsi_driver_register_full(driver, THIS_MODULE)
475
476 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
477 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
478 mipi_dsi_driver_unregister)
479
480 #endif /* __DRM_MIPI_DSI__ */
481