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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * i.MX8 NWL MIPI DSI host driver
4 *
5 * Copyright (C) 2017 NXP
6 * Copyright (C) 2020 Purism SPC
7 */
8
9#include <linux/bitfield.h>
10#include <linux/clk.h>
11#include <linux/irq.h>
12#include <linux/math64.h>
13#include <linux/mfd/syscon.h>
14#include <linux/module.h>
15#include <linux/mux/consumer.h>
16#include <linux/of.h>
17#include <linux/of_platform.h>
18#include <linux/phy/phy.h>
19#include <linux/regmap.h>
20#include <linux/reset.h>
21#include <linux/sys_soc.h>
22#include <linux/time64.h>
23
24#include <drm/drm_bridge.h>
25#include <drm/drm_mipi_dsi.h>
26#include <drm/drm_of.h>
27#include <drm/drm_panel.h>
28#include <drm/drm_print.h>
29
30#include <video/mipi_display.h>
31
32#include "nwl-dsi.h"
33
34#define DRV_NAME "nwl-dsi"
35
36/* i.MX8 NWL quirks */
37/* i.MX8MQ errata E11418 */
38#define E11418_HS_MODE_QUIRK BIT(0)
39
40#define NWL_DSI_MIPI_FIFO_TIMEOUT msecs_to_jiffies(500)
41
42enum transfer_direction {
43 DSI_PACKET_SEND,
44 DSI_PACKET_RECEIVE,
45};
46
47#define NWL_DSI_ENDPOINT_LCDIF 0
48#define NWL_DSI_ENDPOINT_DCSS 1
49
50struct nwl_dsi_plat_clk_config {
51 const char *id;
52 struct clk *clk;
53 bool present;
54};
55
56struct nwl_dsi_transfer {
57 const struct mipi_dsi_msg *msg;
58 struct mipi_dsi_packet packet;
59 struct completion completed;
60
61 int status; /* status of transmission */
62 enum transfer_direction direction;
63 bool need_bta;
64 u8 cmd;
65 u16 rx_word_count;
66 size_t tx_len; /* in bytes */
67 size_t rx_len; /* in bytes */
68};
69
70struct nwl_dsi {
71 struct drm_bridge bridge;
72 struct mipi_dsi_host dsi_host;
73 struct drm_bridge *panel_bridge;
74 struct device *dev;
75 struct phy *phy;
76 union phy_configure_opts phy_cfg;
77 unsigned int quirks;
78
79 struct regmap *regmap;
80 int irq;
81 /*
82 * The DSI host controller needs this reset sequence according to NWL:
83 * 1. Deassert pclk reset to get access to DSI regs
84 * 2. Configure DSI Host and DPHY and enable DPHY
85 * 3. Deassert ESC and BYTE resets to allow host TX operations)
86 * 4. Send DSI cmds to configure peripheral (handled by panel drv)
87 * 5. Deassert DPI reset so DPI receives pixels and starts sending
88 * DSI data
89 *
90 * TODO: Since panel_bridges do their DSI setup in enable we
91 * currently have 4. and 5. swapped.
92 */
93 struct reset_control *rst_byte;
94 struct reset_control *rst_esc;
95 struct reset_control *rst_dpi;
96 struct reset_control *rst_pclk;
97 struct mux_control *mux;
98
99 /* DSI clocks */
100 struct clk *phy_ref_clk;
101 struct clk *rx_esc_clk;
102 struct clk *tx_esc_clk;
103 struct clk *core_clk;
104 /*
105 * hardware bug: the i.MX8MQ needs this clock on during reset
106 * even when not using LCDIF.
107 */
108 struct clk *lcdif_clk;
109
110 /* dsi lanes */
111 u32 lanes;
112 enum mipi_dsi_pixel_format format;
113 struct drm_display_mode mode;
114 unsigned long dsi_mode_flags;
115 int error;
116
117 struct nwl_dsi_transfer *xfer;
118};
119
120static const struct regmap_config nwl_dsi_regmap_config = {
121 .reg_bits = 16,
122 .val_bits = 32,
123 .reg_stride = 4,
124 .max_register = NWL_DSI_IRQ_MASK2,
125 .name = DRV_NAME,
126};
127
128static inline struct nwl_dsi *bridge_to_dsi(struct drm_bridge *bridge)
129{
130 return container_of(bridge, struct nwl_dsi, bridge);
131}
132
133static int nwl_dsi_clear_error(struct nwl_dsi *dsi)
134{
135 int ret = dsi->error;
136
137 dsi->error = 0;
138 return ret;
139}
140
141static void nwl_dsi_write(struct nwl_dsi *dsi, unsigned int reg, u32 val)
142{
143 int ret;
144
145 if (dsi->error)
146 return;
147
148 ret = regmap_write(dsi->regmap, reg, val);
149 if (ret < 0) {
150 DRM_DEV_ERROR(dsi->dev,
151 "Failed to write NWL DSI reg 0x%x: %d\n", reg,
152 ret);
153 dsi->error = ret;
154 }
155}
156
157static u32 nwl_dsi_read(struct nwl_dsi *dsi, u32 reg)
158{
159 unsigned int val;
160 int ret;
161
162 if (dsi->error)
163 return 0;
164
165 ret = regmap_read(dsi->regmap, reg, &val);
166 if (ret < 0) {
167 DRM_DEV_ERROR(dsi->dev, "Failed to read NWL DSI reg 0x%x: %d\n",
168 reg, ret);
169 dsi->error = ret;
170 }
171 return val;
172}
173
174static int nwl_dsi_get_dpi_pixel_format(enum mipi_dsi_pixel_format format)
175{
176 switch (format) {
177 case MIPI_DSI_FMT_RGB565:
178 return NWL_DSI_PIXEL_FORMAT_16;
179 case MIPI_DSI_FMT_RGB666:
180 return NWL_DSI_PIXEL_FORMAT_18L;
181 case MIPI_DSI_FMT_RGB666_PACKED:
182 return NWL_DSI_PIXEL_FORMAT_18;
183 case MIPI_DSI_FMT_RGB888:
184 return NWL_DSI_PIXEL_FORMAT_24;
185 default:
186 return -EINVAL;
187 }
188}
189
190/*
191 * ps2bc - Picoseconds to byte clock cycles
192 */
193static u32 ps2bc(struct nwl_dsi *dsi, unsigned long long ps)
194{
195 u32 bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
196
197 return DIV64_U64_ROUND_UP(ps * dsi->mode.clock * bpp,
198 dsi->lanes * 8 * NSEC_PER_SEC);
199}
200
201/*
202 * ui2bc - UI time periods to byte clock cycles
203 */
204static u32 ui2bc(struct nwl_dsi *dsi, unsigned long long ui)
205{
206 u32 bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
207
208 return DIV64_U64_ROUND_UP(ui * dsi->lanes,
209 dsi->mode.clock * 1000 * bpp);
210}
211
212/*
213 * us2bc - micro seconds to lp clock cycles
214 */
215static u32 us2lp(u32 lp_clk_rate, unsigned long us)
216{
217 return DIV_ROUND_UP(us * lp_clk_rate, USEC_PER_SEC);
218}
219
220static int nwl_dsi_config_host(struct nwl_dsi *dsi)
221{
222 u32 cycles;
223 struct phy_configure_opts_mipi_dphy *cfg = &dsi->phy_cfg.mipi_dphy;
224
225 if (dsi->lanes < 1 || dsi->lanes > 4)
226 return -EINVAL;
227
228 DRM_DEV_DEBUG_DRIVER(dsi->dev, "DSI Lanes %d\n", dsi->lanes);
229 nwl_dsi_write(dsi, NWL_DSI_CFG_NUM_LANES, dsi->lanes - 1);
230
231 if (dsi->dsi_mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
232 nwl_dsi_write(dsi, NWL_DSI_CFG_NONCONTINUOUS_CLK, 0x01);
233 nwl_dsi_write(dsi, NWL_DSI_CFG_AUTOINSERT_EOTP, 0x01);
234 } else {
235 nwl_dsi_write(dsi, NWL_DSI_CFG_NONCONTINUOUS_CLK, 0x00);
236 nwl_dsi_write(dsi, NWL_DSI_CFG_AUTOINSERT_EOTP, 0x00);
237 }
238
239 /* values in byte clock cycles */
240 cycles = ui2bc(dsi, cfg->clk_pre);
241 DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_t_pre: 0x%x\n", cycles);
242 nwl_dsi_write(dsi, NWL_DSI_CFG_T_PRE, cycles);
243 cycles = ps2bc(dsi, cfg->lpx + cfg->clk_prepare + cfg->clk_zero);
244 DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_tx_gap (pre): 0x%x\n", cycles);
245 cycles += ui2bc(dsi, cfg->clk_pre);
246 DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_t_post: 0x%x\n", cycles);
247 nwl_dsi_write(dsi, NWL_DSI_CFG_T_POST, cycles);
248 cycles = ps2bc(dsi, cfg->hs_exit);
249 DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_tx_gap: 0x%x\n", cycles);
250 nwl_dsi_write(dsi, NWL_DSI_CFG_TX_GAP, cycles);
251
252 nwl_dsi_write(dsi, NWL_DSI_CFG_EXTRA_CMDS_AFTER_EOTP, 0x01);
253 nwl_dsi_write(dsi, NWL_DSI_CFG_HTX_TO_COUNT, 0x00);
254 nwl_dsi_write(dsi, NWL_DSI_CFG_LRX_H_TO_COUNT, 0x00);
255 nwl_dsi_write(dsi, NWL_DSI_CFG_BTA_H_TO_COUNT, 0x00);
256 /* In LP clock cycles */
257 cycles = us2lp(cfg->lp_clk_rate, cfg->wakeup);
258 DRM_DEV_DEBUG_DRIVER(dsi->dev, "cfg_twakeup: 0x%x\n", cycles);
259 nwl_dsi_write(dsi, NWL_DSI_CFG_TWAKEUP, cycles);
260
261 return nwl_dsi_clear_error(dsi);
262}
263
264static int nwl_dsi_config_dpi(struct nwl_dsi *dsi)
265{
266 u32 mode;
267 int color_format;
268 bool burst_mode;
269 int hfront_porch, hback_porch, vfront_porch, vback_porch;
270 int hsync_len, vsync_len;
271
272 hfront_porch = dsi->mode.hsync_start - dsi->mode.hdisplay;
273 hsync_len = dsi->mode.hsync_end - dsi->mode.hsync_start;
274 hback_porch = dsi->mode.htotal - dsi->mode.hsync_end;
275
276 vfront_porch = dsi->mode.vsync_start - dsi->mode.vdisplay;
277 vsync_len = dsi->mode.vsync_end - dsi->mode.vsync_start;
278 vback_porch = dsi->mode.vtotal - dsi->mode.vsync_end;
279
280 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hfront_porch = %d\n", hfront_porch);
281 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hback_porch = %d\n", hback_porch);
282 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hsync_len = %d\n", hsync_len);
283 DRM_DEV_DEBUG_DRIVER(dsi->dev, "hdisplay = %d\n", dsi->mode.hdisplay);
284 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vfront_porch = %d\n", vfront_porch);
285 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vback_porch = %d\n", vback_porch);
286 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vsync_len = %d\n", vsync_len);
287 DRM_DEV_DEBUG_DRIVER(dsi->dev, "vactive = %d\n", dsi->mode.vdisplay);
288 DRM_DEV_DEBUG_DRIVER(dsi->dev, "clock = %d kHz\n", dsi->mode.clock);
289
290 color_format = nwl_dsi_get_dpi_pixel_format(dsi->format);
291 if (color_format < 0) {
292 DRM_DEV_ERROR(dsi->dev, "Invalid color format 0x%x\n",
293 dsi->format);
294 return color_format;
295 }
296 DRM_DEV_DEBUG_DRIVER(dsi->dev, "pixel fmt = %d\n", dsi->format);
297
298 nwl_dsi_write(dsi, NWL_DSI_INTERFACE_COLOR_CODING, NWL_DSI_DPI_24_BIT);
299 nwl_dsi_write(dsi, NWL_DSI_PIXEL_FORMAT, color_format);
300 /*
301 * Adjusting input polarity based on the video mode results in
302 * a black screen so always pick active low:
303 */
304 nwl_dsi_write(dsi, NWL_DSI_VSYNC_POLARITY,
305 NWL_DSI_VSYNC_POLARITY_ACTIVE_LOW);
306 nwl_dsi_write(dsi, NWL_DSI_HSYNC_POLARITY,
307 NWL_DSI_HSYNC_POLARITY_ACTIVE_LOW);
308
309 burst_mode = (dsi->dsi_mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&
310 !(dsi->dsi_mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE);
311
312 if (burst_mode) {
313 nwl_dsi_write(dsi, NWL_DSI_VIDEO_MODE, NWL_DSI_VM_BURST_MODE);
314 nwl_dsi_write(dsi, NWL_DSI_PIXEL_FIFO_SEND_LEVEL, 256);
315 } else {
316 mode = ((dsi->dsi_mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) ?
317 NWL_DSI_VM_BURST_MODE_WITH_SYNC_PULSES :
318 NWL_DSI_VM_NON_BURST_MODE_WITH_SYNC_EVENTS);
319 nwl_dsi_write(dsi, NWL_DSI_VIDEO_MODE, mode);
320 nwl_dsi_write(dsi, NWL_DSI_PIXEL_FIFO_SEND_LEVEL,
321 dsi->mode.hdisplay);
322 }
323
324 nwl_dsi_write(dsi, NWL_DSI_HFP, hfront_porch);
325 nwl_dsi_write(dsi, NWL_DSI_HBP, hback_porch);
326 nwl_dsi_write(dsi, NWL_DSI_HSA, hsync_len);
327
328 nwl_dsi_write(dsi, NWL_DSI_ENABLE_MULT_PKTS, 0x0);
329 nwl_dsi_write(dsi, NWL_DSI_BLLP_MODE, 0x1);
330 nwl_dsi_write(dsi, NWL_DSI_USE_NULL_PKT_BLLP, 0x0);
331 nwl_dsi_write(dsi, NWL_DSI_VC, 0x0);
332
333 nwl_dsi_write(dsi, NWL_DSI_PIXEL_PAYLOAD_SIZE, dsi->mode.hdisplay);
334 nwl_dsi_write(dsi, NWL_DSI_VACTIVE, dsi->mode.vdisplay - 1);
335 nwl_dsi_write(dsi, NWL_DSI_VBP, vback_porch);
336 nwl_dsi_write(dsi, NWL_DSI_VFP, vfront_porch);
337
338 return nwl_dsi_clear_error(dsi);
339}
340
341static int nwl_dsi_init_interrupts(struct nwl_dsi *dsi)
342{
343 u32 irq_enable;
344
345 nwl_dsi_write(dsi, NWL_DSI_IRQ_MASK, 0xffffffff);
346 nwl_dsi_write(dsi, NWL_DSI_IRQ_MASK2, 0x7);
347
348 irq_enable = ~(u32)(NWL_DSI_TX_PKT_DONE_MASK |
349 NWL_DSI_RX_PKT_HDR_RCVD_MASK |
350 NWL_DSI_TX_FIFO_OVFLW_MASK |
351 NWL_DSI_HS_TX_TIMEOUT_MASK);
352
353 nwl_dsi_write(dsi, NWL_DSI_IRQ_MASK, irq_enable);
354
355 return nwl_dsi_clear_error(dsi);
356}
357
358static int nwl_dsi_host_attach(struct mipi_dsi_host *dsi_host,
359 struct mipi_dsi_device *device)
360{
361 struct nwl_dsi *dsi = container_of(dsi_host, struct nwl_dsi, dsi_host);
362 struct device *dev = dsi->dev;
363
364 DRM_DEV_INFO(dev, "lanes=%u, format=0x%x flags=0x%lx\n", device->lanes,
365 device->format, device->mode_flags);
366
367 if (device->lanes < 1 || device->lanes > 4)
368 return -EINVAL;
369
370 dsi->lanes = device->lanes;
371 dsi->format = device->format;
372 dsi->dsi_mode_flags = device->mode_flags;
373
374 return 0;
375}
376
377static bool nwl_dsi_read_packet(struct nwl_dsi *dsi, u32 status)
378{
379 struct device *dev = dsi->dev;
380 struct nwl_dsi_transfer *xfer = dsi->xfer;
381 int err;
382 u8 *payload = xfer->msg->rx_buf;
383 u32 val;
384 u16 word_count;
385 u8 channel;
386 u8 data_type;
387
388 xfer->status = 0;
389
390 if (xfer->rx_word_count == 0) {
391 if (!(status & NWL_DSI_RX_PKT_HDR_RCVD))
392 return false;
393 /* Get the RX header and parse it */
394 val = nwl_dsi_read(dsi, NWL_DSI_RX_PKT_HEADER);
395 err = nwl_dsi_clear_error(dsi);
396 if (err)
397 xfer->status = err;
398 word_count = NWL_DSI_WC(val);
399 channel = NWL_DSI_RX_VC(val);
400 data_type = NWL_DSI_RX_DT(val);
401
402 if (channel != xfer->msg->channel) {
403 DRM_DEV_ERROR(dev,
404 "[%02X] Channel mismatch (%u != %u)\n",
405 xfer->cmd, channel, xfer->msg->channel);
406 xfer->status = -EINVAL;
407 return true;
408 }
409
410 switch (data_type) {
411 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
412 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
413 if (xfer->msg->rx_len > 1) {
414 /* read second byte */
415 payload[1] = word_count >> 8;
416 ++xfer->rx_len;
417 }
418 fallthrough;
419 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
420 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
421 if (xfer->msg->rx_len > 0) {
422 /* read first byte */
423 payload[0] = word_count & 0xff;
424 ++xfer->rx_len;
425 }
426 xfer->status = xfer->rx_len;
427 return true;
428 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
429 word_count &= 0xff;
430 DRM_DEV_ERROR(dev, "[%02X] DSI error report: 0x%02x\n",
431 xfer->cmd, word_count);
432 xfer->status = -EPROTO;
433 return true;
434 }
435
436 if (word_count > xfer->msg->rx_len) {
437 DRM_DEV_ERROR(dev,
438 "[%02X] Receive buffer too small: %zu (< %u)\n",
439 xfer->cmd, xfer->msg->rx_len, word_count);
440 xfer->status = -EINVAL;
441 return true;
442 }
443
444 xfer->rx_word_count = word_count;
445 } else {
446 /* Set word_count from previous header read */
447 word_count = xfer->rx_word_count;
448 }
449
450 /* If RX payload is not yet received, wait for it */
451 if (!(status & NWL_DSI_RX_PKT_PAYLOAD_DATA_RCVD))
452 return false;
453
454 /* Read the RX payload */
455 while (word_count >= 4) {
456 val = nwl_dsi_read(dsi, NWL_DSI_RX_PAYLOAD);
457 payload[0] = (val >> 0) & 0xff;
458 payload[1] = (val >> 8) & 0xff;
459 payload[2] = (val >> 16) & 0xff;
460 payload[3] = (val >> 24) & 0xff;
461 payload += 4;
462 xfer->rx_len += 4;
463 word_count -= 4;
464 }
465
466 if (word_count > 0) {
467 val = nwl_dsi_read(dsi, NWL_DSI_RX_PAYLOAD);
468 switch (word_count) {
469 case 3:
470 payload[2] = (val >> 16) & 0xff;
471 ++xfer->rx_len;
472 fallthrough;
473 case 2:
474 payload[1] = (val >> 8) & 0xff;
475 ++xfer->rx_len;
476 fallthrough;
477 case 1:
478 payload[0] = (val >> 0) & 0xff;
479 ++xfer->rx_len;
480 break;
481 }
482 }
483
484 xfer->status = xfer->rx_len;
485 err = nwl_dsi_clear_error(dsi);
486 if (err)
487 xfer->status = err;
488
489 return true;
490}
491
492static void nwl_dsi_finish_transmission(struct nwl_dsi *dsi, u32 status)
493{
494 struct nwl_dsi_transfer *xfer = dsi->xfer;
495 bool end_packet = false;
496
497 if (!xfer)
498 return;
499
500 if (xfer->direction == DSI_PACKET_SEND &&
501 status & NWL_DSI_TX_PKT_DONE) {
502 xfer->status = xfer->tx_len;
503 end_packet = true;
504 } else if (status & NWL_DSI_DPHY_DIRECTION &&
505 ((status & (NWL_DSI_RX_PKT_HDR_RCVD |
506 NWL_DSI_RX_PKT_PAYLOAD_DATA_RCVD)))) {
507 end_packet = nwl_dsi_read_packet(dsi, status);
508 }
509
510 if (end_packet)
511 complete(&xfer->completed);
512}
513
514static void nwl_dsi_begin_transmission(struct nwl_dsi *dsi)
515{
516 struct nwl_dsi_transfer *xfer = dsi->xfer;
517 struct mipi_dsi_packet *pkt = &xfer->packet;
518 const u8 *payload;
519 size_t length;
520 u16 word_count;
521 u8 hs_mode;
522 u32 val;
523 u32 hs_workaround = 0;
524
525 /* Send the payload, if any */
526 length = pkt->payload_length;
527 payload = pkt->payload;
528
529 while (length >= 4) {
530 val = *(u32 *)payload;
531 hs_workaround |= !(val & 0xFFFF00);
532 nwl_dsi_write(dsi, NWL_DSI_TX_PAYLOAD, val);
533 payload += 4;
534 length -= 4;
535 }
536 /* Send the rest of the payload */
537 val = 0;
538 switch (length) {
539 case 3:
540 val |= payload[2] << 16;
541 fallthrough;
542 case 2:
543 val |= payload[1] << 8;
544 hs_workaround |= !(val & 0xFFFF00);
545 fallthrough;
546 case 1:
547 val |= payload[0];
548 nwl_dsi_write(dsi, NWL_DSI_TX_PAYLOAD, val);
549 break;
550 }
551 xfer->tx_len = pkt->payload_length;
552
553 /*
554 * Send the header
555 * header[0] = Virtual Channel + Data Type
556 * header[1] = Word Count LSB (LP) or first param (SP)
557 * header[2] = Word Count MSB (LP) or second param (SP)
558 */
559 word_count = pkt->header[1] | (pkt->header[2] << 8);
560 if (hs_workaround && (dsi->quirks & E11418_HS_MODE_QUIRK)) {
561 DRM_DEV_DEBUG_DRIVER(dsi->dev,
562 "Using hs mode workaround for cmd 0x%x\n",
563 xfer->cmd);
564 hs_mode = 1;
565 } else {
566 hs_mode = (xfer->msg->flags & MIPI_DSI_MSG_USE_LPM) ? 0 : 1;
567 }
568 val = NWL_DSI_WC(word_count) | NWL_DSI_TX_VC(xfer->msg->channel) |
569 NWL_DSI_TX_DT(xfer->msg->type) | NWL_DSI_HS_SEL(hs_mode) |
570 NWL_DSI_BTA_TX(xfer->need_bta);
571 nwl_dsi_write(dsi, NWL_DSI_PKT_CONTROL, val);
572
573 /* Send packet command */
574 nwl_dsi_write(dsi, NWL_DSI_SEND_PACKET, 0x1);
575}
576
577static ssize_t nwl_dsi_host_transfer(struct mipi_dsi_host *dsi_host,
578 const struct mipi_dsi_msg *msg)
579{
580 struct nwl_dsi *dsi = container_of(dsi_host, struct nwl_dsi, dsi_host);
581 struct nwl_dsi_transfer xfer;
582 ssize_t ret = 0;
583
584 /* Create packet to be sent */
585 dsi->xfer = &xfer;
586 ret = mipi_dsi_create_packet(&xfer.packet, msg);
587 if (ret < 0) {
588 dsi->xfer = NULL;
589 return ret;
590 }
591
592 if ((msg->type & MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM ||
593 msg->type & MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM ||
594 msg->type & MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM ||
595 msg->type & MIPI_DSI_DCS_READ) &&
596 msg->rx_len > 0 && msg->rx_buf)
597 xfer.direction = DSI_PACKET_RECEIVE;
598 else
599 xfer.direction = DSI_PACKET_SEND;
600
601 xfer.need_bta = (xfer.direction == DSI_PACKET_RECEIVE);
602 xfer.need_bta |= (msg->flags & MIPI_DSI_MSG_REQ_ACK) ? 1 : 0;
603 xfer.msg = msg;
604 xfer.status = -ETIMEDOUT;
605 xfer.rx_word_count = 0;
606 xfer.rx_len = 0;
607 xfer.cmd = 0x00;
608 if (msg->tx_len > 0)
609 xfer.cmd = ((u8 *)(msg->tx_buf))[0];
610 init_completion(&xfer.completed);
611
612 ret = clk_prepare_enable(dsi->rx_esc_clk);
613 if (ret < 0) {
614 DRM_DEV_ERROR(dsi->dev, "Failed to enable rx_esc clk: %zd\n",
615 ret);
616 return ret;
617 }
618 DRM_DEV_DEBUG_DRIVER(dsi->dev, "Enabled rx_esc clk @%lu Hz\n",
619 clk_get_rate(dsi->rx_esc_clk));
620
621 /* Initiate the DSI packet transmision */
622 nwl_dsi_begin_transmission(dsi);
623
624 if (!wait_for_completion_timeout(&xfer.completed,
625 NWL_DSI_MIPI_FIFO_TIMEOUT)) {
626 DRM_DEV_ERROR(dsi_host->dev, "[%02X] DSI transfer timed out\n",
627 xfer.cmd);
628 ret = -ETIMEDOUT;
629 } else {
630 ret = xfer.status;
631 }
632
633 clk_disable_unprepare(dsi->rx_esc_clk);
634
635 return ret;
636}
637
638static const struct mipi_dsi_host_ops nwl_dsi_host_ops = {
639 .attach = nwl_dsi_host_attach,
640 .transfer = nwl_dsi_host_transfer,
641};
642
643static irqreturn_t nwl_dsi_irq_handler(int irq, void *data)
644{
645 u32 irq_status;
646 struct nwl_dsi *dsi = data;
647
648 irq_status = nwl_dsi_read(dsi, NWL_DSI_IRQ_STATUS);
649
650 if (irq_status & NWL_DSI_TX_FIFO_OVFLW)
651 DRM_DEV_ERROR_RATELIMITED(dsi->dev, "tx fifo overflow\n");
652
653 if (irq_status & NWL_DSI_HS_TX_TIMEOUT)
654 DRM_DEV_ERROR_RATELIMITED(dsi->dev, "HS tx timeout\n");
655
656 if (irq_status & NWL_DSI_TX_PKT_DONE ||
657 irq_status & NWL_DSI_RX_PKT_HDR_RCVD ||
658 irq_status & NWL_DSI_RX_PKT_PAYLOAD_DATA_RCVD)
659 nwl_dsi_finish_transmission(dsi, irq_status);
660
661 return IRQ_HANDLED;
662}
663
664static int nwl_dsi_enable(struct nwl_dsi *dsi)
665{
666 struct device *dev = dsi->dev;
667 union phy_configure_opts *phy_cfg = &dsi->phy_cfg;
668 int ret;
669
670 if (!dsi->lanes) {
671 DRM_DEV_ERROR(dev, "Need DSI lanes: %d\n", dsi->lanes);
672 return -EINVAL;
673 }
674
675 ret = phy_init(dsi->phy);
676 if (ret < 0) {
677 DRM_DEV_ERROR(dev, "Failed to init DSI phy: %d\n", ret);
678 return ret;
679 }
680
681 ret = phy_configure(dsi->phy, phy_cfg);
682 if (ret < 0) {
683 DRM_DEV_ERROR(dev, "Failed to configure DSI phy: %d\n", ret);
684 goto uninit_phy;
685 }
686
687 ret = clk_prepare_enable(dsi->tx_esc_clk);
688 if (ret < 0) {
689 DRM_DEV_ERROR(dsi->dev, "Failed to enable tx_esc clk: %d\n",
690 ret);
691 goto uninit_phy;
692 }
693 DRM_DEV_DEBUG_DRIVER(dsi->dev, "Enabled tx_esc clk @%lu Hz\n",
694 clk_get_rate(dsi->tx_esc_clk));
695
696 ret = nwl_dsi_config_host(dsi);
697 if (ret < 0) {
698 DRM_DEV_ERROR(dev, "Failed to set up DSI: %d", ret);
699 goto disable_clock;
700 }
701
702 ret = nwl_dsi_config_dpi(dsi);
703 if (ret < 0) {
704 DRM_DEV_ERROR(dev, "Failed to set up DPI: %d", ret);
705 goto disable_clock;
706 }
707
708 ret = phy_power_on(dsi->phy);
709 if (ret < 0) {
710 DRM_DEV_ERROR(dev, "Failed to power on DPHY (%d)\n", ret);
711 goto disable_clock;
712 }
713
714 ret = nwl_dsi_init_interrupts(dsi);
715 if (ret < 0)
716 goto power_off_phy;
717
718 return ret;
719
720power_off_phy:
721 phy_power_off(dsi->phy);
722disable_clock:
723 clk_disable_unprepare(dsi->tx_esc_clk);
724uninit_phy:
725 phy_exit(dsi->phy);
726
727 return ret;
728}
729
730static int nwl_dsi_disable(struct nwl_dsi *dsi)
731{
732 struct device *dev = dsi->dev;
733
734 DRM_DEV_DEBUG_DRIVER(dev, "Disabling clocks and phy\n");
735
736 phy_power_off(dsi->phy);
737 phy_exit(dsi->phy);
738
739 /* Disabling the clock before the phy breaks enabling dsi again */
740 clk_disable_unprepare(dsi->tx_esc_clk);
741
742 return 0;
743}
744
745static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
746{
747 struct nwl_dsi *dsi = bridge_to_dsi(bridge);
748 int ret;
749
750 nwl_dsi_disable(dsi);
751
752 ret = reset_control_assert(dsi->rst_dpi);
753 if (ret < 0) {
754 DRM_DEV_ERROR(dsi->dev, "Failed to assert DPI: %d\n", ret);
755 return;
756 }
757 ret = reset_control_assert(dsi->rst_byte);
758 if (ret < 0) {
759 DRM_DEV_ERROR(dsi->dev, "Failed to assert ESC: %d\n", ret);
760 return;
761 }
762 ret = reset_control_assert(dsi->rst_esc);
763 if (ret < 0) {
764 DRM_DEV_ERROR(dsi->dev, "Failed to assert BYTE: %d\n", ret);
765 return;
766 }
767 ret = reset_control_assert(dsi->rst_pclk);
768 if (ret < 0) {
769 DRM_DEV_ERROR(dsi->dev, "Failed to assert PCLK: %d\n", ret);
770 return;
771 }
772
773 clk_disable_unprepare(dsi->core_clk);
774 clk_disable_unprepare(dsi->lcdif_clk);
775
776 pm_runtime_put(dsi->dev);
777}
778
779static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
780 const struct drm_display_mode *mode,
781 union phy_configure_opts *phy_opts)
782{
783 unsigned long rate;
784 int ret;
785
786 if (dsi->lanes < 1 || dsi->lanes > 4)
787 return -EINVAL;
788
789 /*
790 * So far the DPHY spec minimal timings work for both mixel
791 * dphy and nwl dsi host
792 */
793 ret = phy_mipi_dphy_get_default_config(mode->clock * 1000,
794 mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes,
795 &phy_opts->mipi_dphy);
796 if (ret < 0)
797 return ret;
798
799 rate = clk_get_rate(dsi->tx_esc_clk);
800 DRM_DEV_DEBUG_DRIVER(dsi->dev, "LP clk is @%lu Hz\n", rate);
801 phy_opts->mipi_dphy.lp_clk_rate = rate;
802
803 return 0;
804}
805
806static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
807 const struct drm_display_mode *mode,
808 struct drm_display_mode *adjusted_mode)
809{
810 /* At least LCDIF + NWL needs active high sync */
811 adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
812 adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
813
814 return true;
815}
816
817static enum drm_mode_status
818nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
819 const struct drm_display_info *info,
820 const struct drm_display_mode *mode)
821{
822 struct nwl_dsi *dsi = bridge_to_dsi(bridge);
823 int bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
824
825 if (mode->clock * bpp > 15000000 * dsi->lanes)
826 return MODE_CLOCK_HIGH;
827
828 if (mode->clock * bpp < 80000 * dsi->lanes)
829 return MODE_CLOCK_LOW;
830
831 return MODE_OK;
832}
833
834static void
835nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
836 const struct drm_display_mode *mode,
837 const struct drm_display_mode *adjusted_mode)
838{
839 struct nwl_dsi *dsi = bridge_to_dsi(bridge);
840 struct device *dev = dsi->dev;
841 union phy_configure_opts new_cfg;
842 unsigned long phy_ref_rate;
843 int ret;
844
845 ret = nwl_dsi_get_dphy_params(dsi, adjusted_mode, &new_cfg);
846 if (ret < 0)
847 return;
848
849 /*
850 * If hs clock is unchanged, we're all good - all parameters are
851 * derived from it atm.
852 */
853 if (new_cfg.mipi_dphy.hs_clk_rate == dsi->phy_cfg.mipi_dphy.hs_clk_rate)
854 return;
855
856 phy_ref_rate = clk_get_rate(dsi->phy_ref_clk);
857 DRM_DEV_DEBUG_DRIVER(dev, "PHY at ref rate: %lu\n", phy_ref_rate);
858 /* Save the new desired phy config */
859 memcpy(&dsi->phy_cfg, &new_cfg, sizeof(new_cfg));
860
861 memcpy(&dsi->mode, adjusted_mode, sizeof(dsi->mode));
862 drm_mode_debug_printmodeline(adjusted_mode);
863}
864
865static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
866{
867 struct nwl_dsi *dsi = bridge_to_dsi(bridge);
868 int ret;
869
870 pm_runtime_get_sync(dsi->dev);
871
872 if (clk_prepare_enable(dsi->lcdif_clk) < 0)
873 return;
874 if (clk_prepare_enable(dsi->core_clk) < 0)
875 return;
876
877 /* Step 1 from DSI reset-out instructions */
878 ret = reset_control_deassert(dsi->rst_pclk);
879 if (ret < 0) {
880 DRM_DEV_ERROR(dsi->dev, "Failed to deassert PCLK: %d\n", ret);
881 return;
882 }
883
884 /* Step 2 from DSI reset-out instructions */
885 nwl_dsi_enable(dsi);
886
887 /* Step 3 from DSI reset-out instructions */
888 ret = reset_control_deassert(dsi->rst_esc);
889 if (ret < 0) {
890 DRM_DEV_ERROR(dsi->dev, "Failed to deassert ESC: %d\n", ret);
891 return;
892 }
893 ret = reset_control_deassert(dsi->rst_byte);
894 if (ret < 0) {
895 DRM_DEV_ERROR(dsi->dev, "Failed to deassert BYTE: %d\n", ret);
896 return;
897 }
898}
899
900static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
901{
902 struct nwl_dsi *dsi = bridge_to_dsi(bridge);
903 int ret;
904
905 /* Step 5 from DSI reset-out instructions */
906 ret = reset_control_deassert(dsi->rst_dpi);
907 if (ret < 0)
908 DRM_DEV_ERROR(dsi->dev, "Failed to deassert DPI: %d\n", ret);
909}
910
911static int nwl_dsi_bridge_attach(struct drm_bridge *bridge,
912 enum drm_bridge_attach_flags flags)
913{
914 struct nwl_dsi *dsi = bridge_to_dsi(bridge);
915 struct drm_bridge *panel_bridge;
916 struct drm_panel *panel;
917 int ret;
918
919 ret = drm_of_find_panel_or_bridge(dsi->dev->of_node, 1, 0, &panel,
920 &panel_bridge);
921 if (ret)
922 return ret;
923
924 if (panel) {
925 panel_bridge = drm_panel_bridge_add(panel);
926 if (IS_ERR(panel_bridge))
927 return PTR_ERR(panel_bridge);
928 }
929 dsi->panel_bridge = panel_bridge;
930
931 if (!dsi->panel_bridge)
932 return -EPROBE_DEFER;
933
934 return drm_bridge_attach(bridge->encoder, dsi->panel_bridge, bridge,
935 flags);
936}
937
938static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
939{ struct nwl_dsi *dsi = bridge_to_dsi(bridge);
940
941 drm_of_panel_bridge_remove(dsi->dev->of_node, 1, 0);
942}
943
944static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
945 .pre_enable = nwl_dsi_bridge_pre_enable,
946 .enable = nwl_dsi_bridge_enable,
947 .disable = nwl_dsi_bridge_disable,
948 .mode_fixup = nwl_dsi_bridge_mode_fixup,
949 .mode_set = nwl_dsi_bridge_mode_set,
950 .mode_valid = nwl_dsi_bridge_mode_valid,
951 .attach = nwl_dsi_bridge_attach,
952 .detach = nwl_dsi_bridge_detach,
953};
954
955static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
956{
957 struct platform_device *pdev = to_platform_device(dsi->dev);
958 struct clk *clk;
959 void __iomem *base;
960 int ret;
961
962 dsi->phy = devm_phy_get(dsi->dev, "dphy");
963 if (IS_ERR(dsi->phy)) {
964 ret = PTR_ERR(dsi->phy);
965 if (ret != -EPROBE_DEFER)
966 DRM_DEV_ERROR(dsi->dev, "Could not get PHY: %d\n", ret);
967 return ret;
968 }
969
970 clk = devm_clk_get(dsi->dev, "lcdif");
971 if (IS_ERR(clk)) {
972 ret = PTR_ERR(clk);
973 DRM_DEV_ERROR(dsi->dev, "Failed to get lcdif clock: %d\n",
974 ret);
975 return ret;
976 }
977 dsi->lcdif_clk = clk;
978
979 clk = devm_clk_get(dsi->dev, "core");
980 if (IS_ERR(clk)) {
981 ret = PTR_ERR(clk);
982 DRM_DEV_ERROR(dsi->dev, "Failed to get core clock: %d\n",
983 ret);
984 return ret;
985 }
986 dsi->core_clk = clk;
987
988 clk = devm_clk_get(dsi->dev, "phy_ref");
989 if (IS_ERR(clk)) {
990 ret = PTR_ERR(clk);
991 DRM_DEV_ERROR(dsi->dev, "Failed to get phy_ref clock: %d\n",
992 ret);
993 return ret;
994 }
995 dsi->phy_ref_clk = clk;
996
997 clk = devm_clk_get(dsi->dev, "rx_esc");
998 if (IS_ERR(clk)) {
999 ret = PTR_ERR(clk);
1000 DRM_DEV_ERROR(dsi->dev, "Failed to get rx_esc clock: %d\n",
1001 ret);
1002 return ret;
1003 }
1004 dsi->rx_esc_clk = clk;
1005
1006 clk = devm_clk_get(dsi->dev, "tx_esc");
1007 if (IS_ERR(clk)) {
1008 ret = PTR_ERR(clk);
1009 DRM_DEV_ERROR(dsi->dev, "Failed to get tx_esc clock: %d\n",
1010 ret);
1011 return ret;
1012 }
1013 dsi->tx_esc_clk = clk;
1014
1015 dsi->mux = devm_mux_control_get(dsi->dev, NULL);
1016 if (IS_ERR(dsi->mux)) {
1017 ret = PTR_ERR(dsi->mux);
1018 if (ret != -EPROBE_DEFER)
1019 DRM_DEV_ERROR(dsi->dev, "Failed to get mux: %d\n", ret);
1020 return ret;
1021 }
1022
1023 base = devm_platform_ioremap_resource(pdev, 0);
1024 if (IS_ERR(base))
1025 return PTR_ERR(base);
1026
1027 dsi->regmap =
1028 devm_regmap_init_mmio(dsi->dev, base, &nwl_dsi_regmap_config);
1029 if (IS_ERR(dsi->regmap)) {
1030 ret = PTR_ERR(dsi->regmap);
1031 DRM_DEV_ERROR(dsi->dev, "Failed to create NWL DSI regmap: %d\n",
1032 ret);
1033 return ret;
1034 }
1035
1036 dsi->irq = platform_get_irq(pdev, 0);
1037 if (dsi->irq < 0) {
1038 DRM_DEV_ERROR(dsi->dev, "Failed to get device IRQ: %d\n",
1039 dsi->irq);
1040 return dsi->irq;
1041 }
1042
1043 dsi->rst_pclk = devm_reset_control_get_exclusive(dsi->dev, "pclk");
1044 if (IS_ERR(dsi->rst_pclk)) {
1045 DRM_DEV_ERROR(dsi->dev, "Failed to get pclk reset: %ld\n",
1046 PTR_ERR(dsi->rst_pclk));
1047 return PTR_ERR(dsi->rst_pclk);
1048 }
1049 dsi->rst_byte = devm_reset_control_get_exclusive(dsi->dev, "byte");
1050 if (IS_ERR(dsi->rst_byte)) {
1051 DRM_DEV_ERROR(dsi->dev, "Failed to get byte reset: %ld\n",
1052 PTR_ERR(dsi->rst_byte));
1053 return PTR_ERR(dsi->rst_byte);
1054 }
1055 dsi->rst_esc = devm_reset_control_get_exclusive(dsi->dev, "esc");
1056 if (IS_ERR(dsi->rst_esc)) {
1057 DRM_DEV_ERROR(dsi->dev, "Failed to get esc reset: %ld\n",
1058 PTR_ERR(dsi->rst_esc));
1059 return PTR_ERR(dsi->rst_esc);
1060 }
1061 dsi->rst_dpi = devm_reset_control_get_exclusive(dsi->dev, "dpi");
1062 if (IS_ERR(dsi->rst_dpi)) {
1063 DRM_DEV_ERROR(dsi->dev, "Failed to get dpi reset: %ld\n",
1064 PTR_ERR(dsi->rst_dpi));
1065 return PTR_ERR(dsi->rst_dpi);
1066 }
1067 return 0;
1068}
1069
1070static int nwl_dsi_select_input(struct nwl_dsi *dsi)
1071{
1072 struct device_node *remote;
1073 u32 use_dcss = 1;
1074 int ret;
1075
1076 remote = of_graph_get_remote_node(dsi->dev->of_node, 0,
1077 NWL_DSI_ENDPOINT_LCDIF);
1078 if (remote) {
1079 use_dcss = 0;
1080 } else {
1081 remote = of_graph_get_remote_node(dsi->dev->of_node, 0,
1082 NWL_DSI_ENDPOINT_DCSS);
1083 if (!remote) {
1084 DRM_DEV_ERROR(dsi->dev,
1085 "No valid input endpoint found\n");
1086 return -EINVAL;
1087 }
1088 }
1089
1090 DRM_DEV_INFO(dsi->dev, "Using %s as input source\n",
1091 (use_dcss) ? "DCSS" : "LCDIF");
1092 ret = mux_control_try_select(dsi->mux, use_dcss);
1093 if (ret < 0)
1094 DRM_DEV_ERROR(dsi->dev, "Failed to select input: %d\n", ret);
1095
1096 of_node_put(remote);
1097 return ret;
1098}
1099
1100static int nwl_dsi_deselect_input(struct nwl_dsi *dsi)
1101{
1102 int ret;
1103
1104 ret = mux_control_deselect(dsi->mux);
1105 if (ret < 0)
1106 DRM_DEV_ERROR(dsi->dev, "Failed to deselect input: %d\n", ret);
1107
1108 return ret;
1109}
1110
1111static const struct drm_bridge_timings nwl_dsi_timings = {
1112 .input_bus_flags = DRM_BUS_FLAG_DE_LOW,
1113};
1114
1115static const struct of_device_id nwl_dsi_dt_ids[] = {
1116 { .compatible = "fsl,imx8mq-nwl-dsi", },
1117 { /* sentinel */ }
1118};
1119MODULE_DEVICE_TABLE(of, nwl_dsi_dt_ids);
1120
1121static const struct soc_device_attribute nwl_dsi_quirks_match[] = {
1122 { .soc_id = "i.MX8MQ", .revision = "2.0",
1123 .data = (void *)E11418_HS_MODE_QUIRK },
1124 { /* sentinel. */ },
1125};
1126
1127static int nwl_dsi_probe(struct platform_device *pdev)
1128{
1129 struct device *dev = &pdev->dev;
1130 const struct soc_device_attribute *attr;
1131 struct nwl_dsi *dsi;
1132 int ret;
1133
1134 dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
1135 if (!dsi)
1136 return -ENOMEM;
1137
1138 dsi->dev = dev;
1139
1140 ret = nwl_dsi_parse_dt(dsi);
1141 if (ret)
1142 return ret;
1143
1144 ret = devm_request_irq(dev, dsi->irq, nwl_dsi_irq_handler, 0,
1145 dev_name(dev), dsi);
1146 if (ret < 0) {
1147 DRM_DEV_ERROR(dev, "Failed to request IRQ %d: %d\n", dsi->irq,
1148 ret);
1149 return ret;
1150 }
1151
1152 dsi->dsi_host.ops = &nwl_dsi_host_ops;
1153 dsi->dsi_host.dev = dev;
1154 ret = mipi_dsi_host_register(&dsi->dsi_host);
1155 if (ret) {
1156 DRM_DEV_ERROR(dev, "Failed to register MIPI host: %d\n", ret);
1157 return ret;
1158 }
1159
1160 attr = soc_device_match(nwl_dsi_quirks_match);
1161 if (attr)
1162 dsi->quirks = (uintptr_t)attr->data;
1163
1164 dsi->bridge.driver_private = dsi;
1165 dsi->bridge.funcs = &nwl_dsi_bridge_funcs;
1166 dsi->bridge.of_node = dev->of_node;
1167 dsi->bridge.timings = &nwl_dsi_timings;
1168
1169 dev_set_drvdata(dev, dsi);
1170 pm_runtime_enable(dev);
1171
1172 ret = nwl_dsi_select_input(dsi);
1173 if (ret < 0) {
1174 mipi_dsi_host_unregister(&dsi->dsi_host);
1175 return ret;
1176 }
1177
1178 drm_bridge_add(&dsi->bridge);
1179 return 0;
1180}
1181
1182static int nwl_dsi_remove(struct platform_device *pdev)
1183{
1184 struct nwl_dsi *dsi = platform_get_drvdata(pdev);
1185
1186 nwl_dsi_deselect_input(dsi);
1187 mipi_dsi_host_unregister(&dsi->dsi_host);
1188 drm_bridge_remove(&dsi->bridge);
1189 pm_runtime_disable(&pdev->dev);
1190 return 0;
1191}
1192
1193static struct platform_driver nwl_dsi_driver = {
1194 .probe = nwl_dsi_probe,
1195 .remove = nwl_dsi_remove,
1196 .driver = {
1197 .of_match_table = nwl_dsi_dt_ids,
1198 .name = DRV_NAME,
1199 },
1200};
1201
1202module_platform_driver(nwl_dsi_driver);
1203
1204MODULE_AUTHOR("NXP Semiconductor");
1205MODULE_AUTHOR("Purism SPC");
1206MODULE_DESCRIPTION("Northwest Logic MIPI-DSI driver");
1207MODULE_LICENSE("GPL"); /* GPLv2 or later */