1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NXP i.MX8MQ SoC series MIPI-CSI2 receiver driver
4 *
5 * Copyright (C) 2021 Purism SPC
6 */
7
8 #include <linux/clk.h>
9 #include <linux/clk-provider.h>
10 #include <linux/delay.h>
11 #include <linux/errno.h>
12 #include <linux/interconnect.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/kernel.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/module.h>
18 #include <linux/mutex.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/regmap.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/reset.h>
25 #include <linux/spinlock.h>
26
27 #include <media/v4l2-common.h>
28 #include <media/v4l2-device.h>
29 #include <media/v4l2-fwnode.h>
30 #include <media/v4l2-mc.h>
31 #include <media/v4l2-subdev.h>
32
33 #define MIPI_CSI2_DRIVER_NAME "imx8mq-mipi-csi2"
34 #define MIPI_CSI2_SUBDEV_NAME MIPI_CSI2_DRIVER_NAME
35
36 #define MIPI_CSI2_PAD_SINK 0
37 #define MIPI_CSI2_PAD_SOURCE 1
38 #define MIPI_CSI2_PADS_NUM 2
39
40 #define MIPI_CSI2_DEF_PIX_WIDTH 640
41 #define MIPI_CSI2_DEF_PIX_HEIGHT 480
42
43 /* Register map definition */
44
45 /* i.MX8MQ CSI-2 controller CSR */
46 #define CSI2RX_CFG_NUM_LANES 0x100
47 #define CSI2RX_CFG_DISABLE_DATA_LANES 0x104
48 #define CSI2RX_BIT_ERR 0x108
49 #define CSI2RX_IRQ_STATUS 0x10c
50 #define CSI2RX_IRQ_MASK 0x110
51 #define CSI2RX_IRQ_MASK_ALL 0x1ff
52 #define CSI2RX_IRQ_MASK_ULPS_STATUS_CHANGE 0x8
53 #define CSI2RX_ULPS_STATUS 0x114
54 #define CSI2RX_PPI_ERRSOT_HS 0x118
55 #define CSI2RX_PPI_ERRSOTSYNC_HS 0x11c
56 #define CSI2RX_PPI_ERRESC 0x120
57 #define CSI2RX_PPI_ERRSYNCESC 0x124
58 #define CSI2RX_PPI_ERRCONTROL 0x128
59 #define CSI2RX_CFG_DISABLE_PAYLOAD_0 0x12c
60 #define CSI2RX_CFG_VID_VC_IGNORE 0x180
61 #define CSI2RX_CFG_VID_VC 0x184
62 #define CSI2RX_CFG_VID_P_FIFO_SEND_LEVEL 0x188
63 #define CSI2RX_CFG_DISABLE_PAYLOAD_1 0x130
64
65 enum {
66 ST_POWERED = 1,
67 ST_STREAMING = 2,
68 ST_SUSPENDED = 4,
69 };
70
71 enum imx8mq_mipi_csi_clk {
72 CSI2_CLK_CORE,
73 CSI2_CLK_ESC,
74 CSI2_CLK_UI,
75 CSI2_NUM_CLKS,
76 };
77
78 static const char * const imx8mq_mipi_csi_clk_id[CSI2_NUM_CLKS] = {
79 [CSI2_CLK_CORE] = "core",
80 [CSI2_CLK_ESC] = "esc",
81 [CSI2_CLK_UI] = "ui",
82 };
83
84 #define CSI2_NUM_CLKS ARRAY_SIZE(imx8mq_mipi_csi_clk_id)
85
86 #define GPR_CSI2_1_RX_ENABLE BIT(13)
87 #define GPR_CSI2_1_VID_INTFC_ENB BIT(12)
88 #define GPR_CSI2_1_HSEL BIT(10)
89 #define GPR_CSI2_1_CONT_CLK_MODE BIT(8)
90 #define GPR_CSI2_1_S_PRG_RXHS_SETTLE(x) (((x) & 0x3f) << 2)
91
92 /*
93 * The send level configures the number of entries that must accumulate in
94 * the Pixel FIFO before the data will be transferred to the video output.
95 * The exact value needed for this configuration is dependent on the rate at
96 * which the sensor transfers data to the CSI-2 Controller and the user
97 * video clock.
98 *
99 * The calculation is the classical rate-in rate-out type of problem: If the
100 * video bandwidth is 10% faster than the incoming mipi data and the video
101 * line length is 500 pixels, then the fifo should be allowed to fill
102 * 10% of the line length or 50 pixels. If the gap data is ok, then the level
103 * can be set to 16 and ignored.
104 */
105 #define CSI2RX_SEND_LEVEL 64
106
107 struct csi_state {
108 struct device *dev;
109 void __iomem *regs;
110 struct clk_bulk_data clks[CSI2_NUM_CLKS];
111 struct reset_control *rst;
112 struct regulator *mipi_phy_regulator;
113
114 struct v4l2_subdev sd;
115 struct media_pad pads[MIPI_CSI2_PADS_NUM];
116 struct v4l2_async_notifier notifier;
117 struct v4l2_subdev *src_sd;
118
119 struct v4l2_mbus_config_mipi_csi2 bus;
120
121 struct mutex lock; /* Protect state */
122 u32 state;
123
124 struct regmap *phy_gpr;
125 u8 phy_gpr_reg;
126
127 struct icc_path *icc_path;
128 s32 icc_path_bw;
129 };
130
131 /* -----------------------------------------------------------------------------
132 * Format helpers
133 */
134
135 struct csi2_pix_format {
136 u32 code;
137 u8 width;
138 };
139
140 static const struct csi2_pix_format imx8mq_mipi_csi_formats[] = {
141 /* RAW (Bayer and greyscale) formats. */
142 {
143 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
144 .width = 8,
145 }, {
146 .code = MEDIA_BUS_FMT_SGBRG8_1X8,
147 .width = 8,
148 }, {
149 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
150 .width = 8,
151 }, {
152 .code = MEDIA_BUS_FMT_SRGGB8_1X8,
153 .width = 8,
154 }, {
155 .code = MEDIA_BUS_FMT_Y8_1X8,
156 .width = 8,
157 }, {
158 .code = MEDIA_BUS_FMT_SBGGR10_1X10,
159 .width = 10,
160 }, {
161 .code = MEDIA_BUS_FMT_SGBRG10_1X10,
162 .width = 10,
163 }, {
164 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
165 .width = 10,
166 }, {
167 .code = MEDIA_BUS_FMT_SRGGB10_1X10,
168 .width = 10,
169 }, {
170 .code = MEDIA_BUS_FMT_Y10_1X10,
171 .width = 10,
172 }, {
173 .code = MEDIA_BUS_FMT_SBGGR12_1X12,
174 .width = 12,
175 }, {
176 .code = MEDIA_BUS_FMT_SGBRG12_1X12,
177 .width = 12,
178 }, {
179 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
180 .width = 12,
181 }, {
182 .code = MEDIA_BUS_FMT_SRGGB12_1X12,
183 .width = 12,
184 }, {
185 .code = MEDIA_BUS_FMT_Y12_1X12,
186 .width = 12,
187 }, {
188 .code = MEDIA_BUS_FMT_SBGGR14_1X14,
189 .width = 14,
190 }, {
191 .code = MEDIA_BUS_FMT_SGBRG14_1X14,
192 .width = 14,
193 }, {
194 .code = MEDIA_BUS_FMT_SGRBG14_1X14,
195 .width = 14,
196 }, {
197 .code = MEDIA_BUS_FMT_SRGGB14_1X14,
198 .width = 14,
199 },
200 /* YUV formats */
201 {
202 .code = MEDIA_BUS_FMT_YUYV8_1X16,
203 .width = 16,
204 }, {
205 .code = MEDIA_BUS_FMT_UYVY8_1X16,
206 .width = 16,
207 }
208 };
209
find_csi2_format(u32 code)210 static const struct csi2_pix_format *find_csi2_format(u32 code)
211 {
212 unsigned int i;
213
214 for (i = 0; i < ARRAY_SIZE(imx8mq_mipi_csi_formats); i++)
215 if (code == imx8mq_mipi_csi_formats[i].code)
216 return &imx8mq_mipi_csi_formats[i];
217 return NULL;
218 }
219
220 /* -----------------------------------------------------------------------------
221 * Hardware configuration
222 */
223
imx8mq_mipi_csi_write(struct csi_state * state,u32 reg,u32 val)224 static inline void imx8mq_mipi_csi_write(struct csi_state *state, u32 reg, u32 val)
225 {
226 writel(val, state->regs + reg);
227 }
228
imx8mq_mipi_csi_sw_reset(struct csi_state * state)229 static int imx8mq_mipi_csi_sw_reset(struct csi_state *state)
230 {
231 int ret;
232
233 /*
234 * these are most likely self-clearing reset bits. to make it
235 * more clear, the reset-imx7 driver should implement the
236 * .reset() operation.
237 */
238 ret = reset_control_assert(state->rst);
239 if (ret < 0) {
240 dev_err(state->dev, "Failed to assert resets: %d\n", ret);
241 return ret;
242 }
243
244 return 0;
245 }
246
imx8mq_mipi_csi_set_params(struct csi_state * state)247 static void imx8mq_mipi_csi_set_params(struct csi_state *state)
248 {
249 int lanes = state->bus.num_data_lanes;
250
251 imx8mq_mipi_csi_write(state, CSI2RX_CFG_NUM_LANES, lanes - 1);
252 imx8mq_mipi_csi_write(state, CSI2RX_CFG_DISABLE_DATA_LANES,
253 (0xf << lanes) & 0xf);
254 imx8mq_mipi_csi_write(state, CSI2RX_IRQ_MASK, CSI2RX_IRQ_MASK_ALL);
255 /*
256 * 0x180 bit 0 controls the Virtual Channel behaviour: when set the
257 * interface ignores the Virtual Channel (VC) field in received packets;
258 * when cleared it causes the interface to only accept packets whose VC
259 * matches the value to which VC is set at offset 0x184.
260 */
261 imx8mq_mipi_csi_write(state, CSI2RX_CFG_VID_VC_IGNORE, 1);
262 imx8mq_mipi_csi_write(state, CSI2RX_CFG_VID_P_FIFO_SEND_LEVEL,
263 CSI2RX_SEND_LEVEL);
264 }
265
imx8mq_mipi_csi_clk_enable(struct csi_state * state)266 static int imx8mq_mipi_csi_clk_enable(struct csi_state *state)
267 {
268 return clk_bulk_prepare_enable(CSI2_NUM_CLKS, state->clks);
269 }
270
imx8mq_mipi_csi_clk_disable(struct csi_state * state)271 static void imx8mq_mipi_csi_clk_disable(struct csi_state *state)
272 {
273 clk_bulk_disable_unprepare(CSI2_NUM_CLKS, state->clks);
274 }
275
imx8mq_mipi_csi_clk_get(struct csi_state * state)276 static int imx8mq_mipi_csi_clk_get(struct csi_state *state)
277 {
278 unsigned int i;
279
280 for (i = 0; i < CSI2_NUM_CLKS; i++)
281 state->clks[i].id = imx8mq_mipi_csi_clk_id[i];
282
283 return devm_clk_bulk_get(state->dev, CSI2_NUM_CLKS, state->clks);
284 }
285
imx8mq_mipi_csi_calc_hs_settle(struct csi_state * state,struct v4l2_subdev_state * sd_state,u32 * hs_settle)286 static int imx8mq_mipi_csi_calc_hs_settle(struct csi_state *state,
287 struct v4l2_subdev_state *sd_state,
288 u32 *hs_settle)
289 {
290 s64 link_freq;
291 u32 lane_rate;
292 unsigned long esc_clk_rate;
293 u32 min_ths_settle, max_ths_settle, ths_settle_ns, esc_clk_period_ns;
294 const struct v4l2_mbus_framefmt *fmt;
295 const struct csi2_pix_format *csi2_fmt;
296
297 /* Calculate the line rate from the pixel rate. */
298
299 fmt = v4l2_subdev_get_pad_format(&state->sd, sd_state, MIPI_CSI2_PAD_SINK);
300 csi2_fmt = find_csi2_format(fmt->code);
301
302 link_freq = v4l2_get_link_freq(state->src_sd->ctrl_handler,
303 csi2_fmt->width,
304 state->bus.num_data_lanes * 2);
305 if (link_freq < 0) {
306 dev_err(state->dev, "Unable to obtain link frequency: %d\n",
307 (int)link_freq);
308 return link_freq;
309 }
310
311 lane_rate = link_freq * 2;
312 if (lane_rate < 80000000 || lane_rate > 1500000000) {
313 dev_dbg(state->dev, "Out-of-bound lane rate %u\n", lane_rate);
314 return -EINVAL;
315 }
316
317 /*
318 * The D-PHY specification requires Ths-settle to be in the range
319 * 85ns + 6*UI to 140ns + 10*UI, with the unit interval UI being half
320 * the clock period.
321 *
322 * The Ths-settle value is expressed in the hardware as a multiple of
323 * the Esc clock period:
324 *
325 * Ths-settle = (PRG_RXHS_SETTLE + 1) * Tperiod of RxClkInEsc
326 *
327 * Due to the one cycle inaccuracy introduced by rounding, the
328 * documentation recommends picking a value away from the boundaries.
329 * Let's pick the average.
330 */
331 esc_clk_rate = clk_get_rate(state->clks[CSI2_CLK_ESC].clk);
332 if (!esc_clk_rate) {
333 dev_err(state->dev, "Could not get esc clock rate.\n");
334 return -EINVAL;
335 }
336
337 dev_dbg(state->dev, "esc clk rate: %lu\n", esc_clk_rate);
338 esc_clk_period_ns = 1000000000 / esc_clk_rate;
339
340 min_ths_settle = 85 + 6 * 1000000 / (lane_rate / 1000);
341 max_ths_settle = 140 + 10 * 1000000 / (lane_rate / 1000);
342 ths_settle_ns = (min_ths_settle + max_ths_settle) / 2;
343
344 *hs_settle = ths_settle_ns / esc_clk_period_ns - 1;
345
346 dev_dbg(state->dev, "lane rate %u Ths_settle %u hs_settle %u\n",
347 lane_rate, ths_settle_ns, *hs_settle);
348
349 return 0;
350 }
351
imx8mq_mipi_csi_start_stream(struct csi_state * state,struct v4l2_subdev_state * sd_state)352 static int imx8mq_mipi_csi_start_stream(struct csi_state *state,
353 struct v4l2_subdev_state *sd_state)
354 {
355 int ret;
356 u32 hs_settle = 0;
357
358 ret = imx8mq_mipi_csi_sw_reset(state);
359 if (ret)
360 return ret;
361
362 imx8mq_mipi_csi_set_params(state);
363 ret = imx8mq_mipi_csi_calc_hs_settle(state, sd_state, &hs_settle);
364 if (ret)
365 return ret;
366
367 regmap_update_bits(state->phy_gpr,
368 state->phy_gpr_reg,
369 0x3fff,
370 GPR_CSI2_1_RX_ENABLE |
371 GPR_CSI2_1_VID_INTFC_ENB |
372 GPR_CSI2_1_HSEL |
373 GPR_CSI2_1_CONT_CLK_MODE |
374 GPR_CSI2_1_S_PRG_RXHS_SETTLE(hs_settle));
375
376 return 0;
377 }
378
imx8mq_mipi_csi_stop_stream(struct csi_state * state)379 static void imx8mq_mipi_csi_stop_stream(struct csi_state *state)
380 {
381 imx8mq_mipi_csi_write(state, CSI2RX_CFG_DISABLE_DATA_LANES, 0xf);
382 }
383
384 /* -----------------------------------------------------------------------------
385 * V4L2 subdev operations
386 */
387
mipi_sd_to_csi2_state(struct v4l2_subdev * sdev)388 static struct csi_state *mipi_sd_to_csi2_state(struct v4l2_subdev *sdev)
389 {
390 return container_of(sdev, struct csi_state, sd);
391 }
392
imx8mq_mipi_csi_s_stream(struct v4l2_subdev * sd,int enable)393 static int imx8mq_mipi_csi_s_stream(struct v4l2_subdev *sd, int enable)
394 {
395 struct csi_state *state = mipi_sd_to_csi2_state(sd);
396 struct v4l2_subdev_state *sd_state;
397 int ret = 0;
398
399 if (enable) {
400 ret = pm_runtime_resume_and_get(state->dev);
401 if (ret < 0)
402 return ret;
403 }
404
405 mutex_lock(&state->lock);
406
407 if (enable) {
408 if (state->state & ST_SUSPENDED) {
409 ret = -EBUSY;
410 goto unlock;
411 }
412
413 sd_state = v4l2_subdev_lock_and_get_active_state(sd);
414 ret = imx8mq_mipi_csi_start_stream(state, sd_state);
415 v4l2_subdev_unlock_state(sd_state);
416
417 if (ret < 0)
418 goto unlock;
419
420 ret = v4l2_subdev_call(state->src_sd, video, s_stream, 1);
421 if (ret < 0)
422 goto unlock;
423
424 state->state |= ST_STREAMING;
425 } else {
426 v4l2_subdev_call(state->src_sd, video, s_stream, 0);
427 imx8mq_mipi_csi_stop_stream(state);
428 state->state &= ~ST_STREAMING;
429 }
430
431 unlock:
432 mutex_unlock(&state->lock);
433
434 if (!enable || ret < 0)
435 pm_runtime_put(state->dev);
436
437 return ret;
438 }
439
imx8mq_mipi_csi_init_cfg(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state)440 static int imx8mq_mipi_csi_init_cfg(struct v4l2_subdev *sd,
441 struct v4l2_subdev_state *sd_state)
442 {
443 struct v4l2_mbus_framefmt *fmt_sink;
444 struct v4l2_mbus_framefmt *fmt_source;
445
446 fmt_sink = v4l2_subdev_get_pad_format(sd, sd_state, MIPI_CSI2_PAD_SINK);
447 fmt_source = v4l2_subdev_get_pad_format(sd, sd_state, MIPI_CSI2_PAD_SOURCE);
448
449 fmt_sink->code = MEDIA_BUS_FMT_SGBRG10_1X10;
450 fmt_sink->width = MIPI_CSI2_DEF_PIX_WIDTH;
451 fmt_sink->height = MIPI_CSI2_DEF_PIX_HEIGHT;
452 fmt_sink->field = V4L2_FIELD_NONE;
453
454 fmt_sink->colorspace = V4L2_COLORSPACE_RAW;
455 fmt_sink->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt_sink->colorspace);
456 fmt_sink->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt_sink->colorspace);
457 fmt_sink->quantization =
458 V4L2_MAP_QUANTIZATION_DEFAULT(false, fmt_sink->colorspace,
459 fmt_sink->ycbcr_enc);
460
461 *fmt_source = *fmt_sink;
462
463 return 0;
464 }
465
imx8mq_mipi_csi_enum_mbus_code(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)466 static int imx8mq_mipi_csi_enum_mbus_code(struct v4l2_subdev *sd,
467 struct v4l2_subdev_state *sd_state,
468 struct v4l2_subdev_mbus_code_enum *code)
469 {
470 /*
471 * We can't transcode in any way, the source format is identical
472 * to the sink format.
473 */
474 if (code->pad == MIPI_CSI2_PAD_SOURCE) {
475 struct v4l2_mbus_framefmt *fmt;
476
477 if (code->index > 0)
478 return -EINVAL;
479
480 fmt = v4l2_subdev_get_pad_format(sd, sd_state, code->pad);
481 code->code = fmt->code;
482 return 0;
483 }
484
485 if (code->pad != MIPI_CSI2_PAD_SINK)
486 return -EINVAL;
487
488 if (code->index >= ARRAY_SIZE(imx8mq_mipi_csi_formats))
489 return -EINVAL;
490
491 code->code = imx8mq_mipi_csi_formats[code->index].code;
492
493 return 0;
494 }
495
imx8mq_mipi_csi_set_fmt(struct v4l2_subdev * sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * sdformat)496 static int imx8mq_mipi_csi_set_fmt(struct v4l2_subdev *sd,
497 struct v4l2_subdev_state *sd_state,
498 struct v4l2_subdev_format *sdformat)
499 {
500 const struct csi2_pix_format *csi2_fmt;
501 struct v4l2_mbus_framefmt *fmt;
502
503 /*
504 * The device can't transcode in any way, the source format can't be
505 * modified.
506 */
507 if (sdformat->pad == MIPI_CSI2_PAD_SOURCE)
508 return v4l2_subdev_get_fmt(sd, sd_state, sdformat);
509
510 if (sdformat->pad != MIPI_CSI2_PAD_SINK)
511 return -EINVAL;
512
513 csi2_fmt = find_csi2_format(sdformat->format.code);
514 if (!csi2_fmt)
515 csi2_fmt = &imx8mq_mipi_csi_formats[0];
516
517 fmt = v4l2_subdev_get_pad_format(sd, sd_state, sdformat->pad);
518
519 fmt->code = csi2_fmt->code;
520 fmt->width = sdformat->format.width;
521 fmt->height = sdformat->format.height;
522
523 sdformat->format = *fmt;
524
525 /* Propagate the format from sink to source. */
526 fmt = v4l2_subdev_get_pad_format(sd, sd_state, MIPI_CSI2_PAD_SOURCE);
527 *fmt = sdformat->format;
528
529 return 0;
530 }
531
532 static const struct v4l2_subdev_video_ops imx8mq_mipi_csi_video_ops = {
533 .s_stream = imx8mq_mipi_csi_s_stream,
534 };
535
536 static const struct v4l2_subdev_pad_ops imx8mq_mipi_csi_pad_ops = {
537 .init_cfg = imx8mq_mipi_csi_init_cfg,
538 .enum_mbus_code = imx8mq_mipi_csi_enum_mbus_code,
539 .get_fmt = v4l2_subdev_get_fmt,
540 .set_fmt = imx8mq_mipi_csi_set_fmt,
541 };
542
543 static const struct v4l2_subdev_ops imx8mq_mipi_csi_subdev_ops = {
544 .video = &imx8mq_mipi_csi_video_ops,
545 .pad = &imx8mq_mipi_csi_pad_ops,
546 };
547
548 /* -----------------------------------------------------------------------------
549 * Media entity operations
550 */
551
552 static const struct media_entity_operations imx8mq_mipi_csi_entity_ops = {
553 .link_validate = v4l2_subdev_link_validate,
554 .get_fwnode_pad = v4l2_subdev_get_fwnode_pad_1_to_1,
555 };
556
557 /* -----------------------------------------------------------------------------
558 * Async subdev notifier
559 */
560
561 static struct csi_state *
mipi_notifier_to_csi2_state(struct v4l2_async_notifier * n)562 mipi_notifier_to_csi2_state(struct v4l2_async_notifier *n)
563 {
564 return container_of(n, struct csi_state, notifier);
565 }
566
imx8mq_mipi_csi_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * sd,struct v4l2_async_connection * asd)567 static int imx8mq_mipi_csi_notify_bound(struct v4l2_async_notifier *notifier,
568 struct v4l2_subdev *sd,
569 struct v4l2_async_connection *asd)
570 {
571 struct csi_state *state = mipi_notifier_to_csi2_state(notifier);
572 struct media_pad *sink = &state->sd.entity.pads[MIPI_CSI2_PAD_SINK];
573
574 state->src_sd = sd;
575
576 return v4l2_create_fwnode_links_to_pad(sd, sink, MEDIA_LNK_FL_ENABLED |
577 MEDIA_LNK_FL_IMMUTABLE);
578 }
579
580 static const struct v4l2_async_notifier_operations imx8mq_mipi_csi_notify_ops = {
581 .bound = imx8mq_mipi_csi_notify_bound,
582 };
583
imx8mq_mipi_csi_async_register(struct csi_state * state)584 static int imx8mq_mipi_csi_async_register(struct csi_state *state)
585 {
586 struct v4l2_fwnode_endpoint vep = {
587 .bus_type = V4L2_MBUS_CSI2_DPHY,
588 };
589 struct v4l2_async_connection *asd;
590 struct fwnode_handle *ep;
591 unsigned int i;
592 int ret;
593
594 v4l2_async_subdev_nf_init(&state->notifier, &state->sd);
595
596 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(state->dev), 0, 0,
597 FWNODE_GRAPH_ENDPOINT_NEXT);
598 if (!ep)
599 return -ENOTCONN;
600
601 ret = v4l2_fwnode_endpoint_parse(ep, &vep);
602 if (ret)
603 goto err_parse;
604
605 for (i = 0; i < vep.bus.mipi_csi2.num_data_lanes; ++i) {
606 if (vep.bus.mipi_csi2.data_lanes[i] != i + 1) {
607 dev_err(state->dev,
608 "data lanes reordering is not supported");
609 ret = -EINVAL;
610 goto err_parse;
611 }
612 }
613
614 state->bus = vep.bus.mipi_csi2;
615
616 dev_dbg(state->dev, "data lanes: %d flags: 0x%08x\n",
617 state->bus.num_data_lanes,
618 state->bus.flags);
619
620 asd = v4l2_async_nf_add_fwnode_remote(&state->notifier, ep,
621 struct v4l2_async_connection);
622 if (IS_ERR(asd)) {
623 ret = PTR_ERR(asd);
624 goto err_parse;
625 }
626
627 fwnode_handle_put(ep);
628
629 state->notifier.ops = &imx8mq_mipi_csi_notify_ops;
630
631 ret = v4l2_async_nf_register(&state->notifier);
632 if (ret)
633 return ret;
634
635 return v4l2_async_register_subdev(&state->sd);
636
637 err_parse:
638 fwnode_handle_put(ep);
639
640 return ret;
641 }
642
643 /* -----------------------------------------------------------------------------
644 * Suspend/resume
645 */
646
imx8mq_mipi_csi_pm_suspend(struct device * dev)647 static void imx8mq_mipi_csi_pm_suspend(struct device *dev)
648 {
649 struct v4l2_subdev *sd = dev_get_drvdata(dev);
650 struct csi_state *state = mipi_sd_to_csi2_state(sd);
651
652 mutex_lock(&state->lock);
653
654 if (state->state & ST_POWERED) {
655 imx8mq_mipi_csi_stop_stream(state);
656 imx8mq_mipi_csi_clk_disable(state);
657 state->state &= ~ST_POWERED;
658 }
659
660 mutex_unlock(&state->lock);
661 }
662
imx8mq_mipi_csi_pm_resume(struct device * dev)663 static int imx8mq_mipi_csi_pm_resume(struct device *dev)
664 {
665 struct v4l2_subdev *sd = dev_get_drvdata(dev);
666 struct csi_state *state = mipi_sd_to_csi2_state(sd);
667 struct v4l2_subdev_state *sd_state;
668 int ret = 0;
669
670 mutex_lock(&state->lock);
671
672 if (!(state->state & ST_POWERED)) {
673 state->state |= ST_POWERED;
674 ret = imx8mq_mipi_csi_clk_enable(state);
675 }
676 if (state->state & ST_STREAMING) {
677 sd_state = v4l2_subdev_lock_and_get_active_state(sd);
678 ret = imx8mq_mipi_csi_start_stream(state, sd_state);
679 v4l2_subdev_unlock_state(sd_state);
680 if (ret)
681 goto unlock;
682 }
683
684 state->state &= ~ST_SUSPENDED;
685
686 unlock:
687 mutex_unlock(&state->lock);
688
689 return ret ? -EAGAIN : 0;
690 }
691
imx8mq_mipi_csi_suspend(struct device * dev)692 static int __maybe_unused imx8mq_mipi_csi_suspend(struct device *dev)
693 {
694 struct v4l2_subdev *sd = dev_get_drvdata(dev);
695 struct csi_state *state = mipi_sd_to_csi2_state(sd);
696
697 imx8mq_mipi_csi_pm_suspend(dev);
698
699 state->state |= ST_SUSPENDED;
700
701 return 0;
702 }
703
imx8mq_mipi_csi_resume(struct device * dev)704 static int __maybe_unused imx8mq_mipi_csi_resume(struct device *dev)
705 {
706 struct v4l2_subdev *sd = dev_get_drvdata(dev);
707 struct csi_state *state = mipi_sd_to_csi2_state(sd);
708
709 if (!(state->state & ST_SUSPENDED))
710 return 0;
711
712 return imx8mq_mipi_csi_pm_resume(dev);
713 }
714
imx8mq_mipi_csi_runtime_suspend(struct device * dev)715 static int __maybe_unused imx8mq_mipi_csi_runtime_suspend(struct device *dev)
716 {
717 struct v4l2_subdev *sd = dev_get_drvdata(dev);
718 struct csi_state *state = mipi_sd_to_csi2_state(sd);
719 int ret;
720
721 imx8mq_mipi_csi_pm_suspend(dev);
722
723 ret = icc_set_bw(state->icc_path, 0, 0);
724 if (ret)
725 dev_err(dev, "icc_set_bw failed with %d\n", ret);
726
727 return ret;
728 }
729
imx8mq_mipi_csi_runtime_resume(struct device * dev)730 static int __maybe_unused imx8mq_mipi_csi_runtime_resume(struct device *dev)
731 {
732 struct v4l2_subdev *sd = dev_get_drvdata(dev);
733 struct csi_state *state = mipi_sd_to_csi2_state(sd);
734 int ret;
735
736 ret = icc_set_bw(state->icc_path, 0, state->icc_path_bw);
737 if (ret) {
738 dev_err(dev, "icc_set_bw failed with %d\n", ret);
739 return ret;
740 }
741
742 return imx8mq_mipi_csi_pm_resume(dev);
743 }
744
745 static const struct dev_pm_ops imx8mq_mipi_csi_pm_ops = {
746 SET_RUNTIME_PM_OPS(imx8mq_mipi_csi_runtime_suspend,
747 imx8mq_mipi_csi_runtime_resume,
748 NULL)
749 SET_SYSTEM_SLEEP_PM_OPS(imx8mq_mipi_csi_suspend, imx8mq_mipi_csi_resume)
750 };
751
752 /* -----------------------------------------------------------------------------
753 * Probe/remove & platform driver
754 */
755
imx8mq_mipi_csi_subdev_init(struct csi_state * state)756 static int imx8mq_mipi_csi_subdev_init(struct csi_state *state)
757 {
758 struct v4l2_subdev *sd = &state->sd;
759 int ret;
760
761 v4l2_subdev_init(sd, &imx8mq_mipi_csi_subdev_ops);
762 sd->owner = THIS_MODULE;
763 snprintf(sd->name, sizeof(sd->name), "%s %s",
764 MIPI_CSI2_SUBDEV_NAME, dev_name(state->dev));
765
766 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
767
768 sd->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
769 sd->entity.ops = &imx8mq_mipi_csi_entity_ops;
770
771 sd->dev = state->dev;
772
773 state->pads[MIPI_CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK
774 | MEDIA_PAD_FL_MUST_CONNECT;
775 state->pads[MIPI_CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE
776 | MEDIA_PAD_FL_MUST_CONNECT;
777 ret = media_entity_pads_init(&sd->entity, MIPI_CSI2_PADS_NUM,
778 state->pads);
779 if (ret)
780 return ret;
781
782 ret = v4l2_subdev_init_finalize(sd);
783 if (ret) {
784 media_entity_cleanup(&sd->entity);
785 return ret;
786 }
787
788 return 0;
789 }
790
imx8mq_mipi_csi_release_icc(struct platform_device * pdev)791 static void imx8mq_mipi_csi_release_icc(struct platform_device *pdev)
792 {
793 struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
794 struct csi_state *state = mipi_sd_to_csi2_state(sd);
795
796 icc_put(state->icc_path);
797 }
798
imx8mq_mipi_csi_init_icc(struct platform_device * pdev)799 static int imx8mq_mipi_csi_init_icc(struct platform_device *pdev)
800 {
801 struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
802 struct csi_state *state = mipi_sd_to_csi2_state(sd);
803
804 /* Optional interconnect request */
805 state->icc_path = of_icc_get(&pdev->dev, "dram");
806 if (IS_ERR_OR_NULL(state->icc_path))
807 return PTR_ERR_OR_ZERO(state->icc_path);
808
809 state->icc_path_bw = MBps_to_icc(700);
810
811 return 0;
812 }
813
imx8mq_mipi_csi_parse_dt(struct csi_state * state)814 static int imx8mq_mipi_csi_parse_dt(struct csi_state *state)
815 {
816 struct device *dev = state->dev;
817 struct device_node *np = state->dev->of_node;
818 struct device_node *node;
819 phandle ph;
820 u32 out_val[2];
821 int ret = 0;
822
823 state->rst = devm_reset_control_array_get_exclusive(dev);
824 if (IS_ERR(state->rst)) {
825 dev_err(dev, "Failed to get reset: %pe\n", state->rst);
826 return PTR_ERR(state->rst);
827 }
828
829 ret = of_property_read_u32_array(np, "fsl,mipi-phy-gpr", out_val,
830 ARRAY_SIZE(out_val));
831 if (ret) {
832 dev_err(dev, "no fsl,mipi-phy-gpr property found: %d\n", ret);
833 return ret;
834 }
835
836 ph = *out_val;
837
838 node = of_find_node_by_phandle(ph);
839 if (!node) {
840 dev_err(dev, "Error finding node by phandle\n");
841 return -ENODEV;
842 }
843 state->phy_gpr = syscon_node_to_regmap(node);
844 of_node_put(node);
845 if (IS_ERR(state->phy_gpr)) {
846 dev_err(dev, "failed to get gpr regmap: %pe\n", state->phy_gpr);
847 return PTR_ERR(state->phy_gpr);
848 }
849
850 state->phy_gpr_reg = out_val[1];
851 dev_dbg(dev, "phy gpr register set to 0x%x\n", state->phy_gpr_reg);
852
853 return ret;
854 }
855
imx8mq_mipi_csi_probe(struct platform_device * pdev)856 static int imx8mq_mipi_csi_probe(struct platform_device *pdev)
857 {
858 struct device *dev = &pdev->dev;
859 struct csi_state *state;
860 int ret;
861
862 state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
863 if (!state)
864 return -ENOMEM;
865
866 state->dev = dev;
867
868 ret = imx8mq_mipi_csi_parse_dt(state);
869 if (ret < 0) {
870 dev_err(dev, "Failed to parse device tree: %d\n", ret);
871 return ret;
872 }
873
874 /* Acquire resources. */
875 state->regs = devm_platform_ioremap_resource(pdev, 0);
876 if (IS_ERR(state->regs))
877 return PTR_ERR(state->regs);
878
879 ret = imx8mq_mipi_csi_clk_get(state);
880 if (ret < 0)
881 return ret;
882
883 platform_set_drvdata(pdev, &state->sd);
884
885 mutex_init(&state->lock);
886
887 ret = imx8mq_mipi_csi_subdev_init(state);
888 if (ret < 0)
889 goto mutex;
890
891 ret = imx8mq_mipi_csi_init_icc(pdev);
892 if (ret)
893 goto mutex;
894
895 /* Enable runtime PM. */
896 pm_runtime_enable(dev);
897 if (!pm_runtime_enabled(dev)) {
898 ret = imx8mq_mipi_csi_runtime_resume(dev);
899 if (ret < 0)
900 goto icc;
901 }
902
903 ret = imx8mq_mipi_csi_async_register(state);
904 if (ret < 0)
905 goto cleanup;
906
907 return 0;
908
909 cleanup:
910 pm_runtime_disable(&pdev->dev);
911 imx8mq_mipi_csi_runtime_suspend(&pdev->dev);
912
913 media_entity_cleanup(&state->sd.entity);
914 v4l2_subdev_cleanup(&state->sd);
915 v4l2_async_nf_unregister(&state->notifier);
916 v4l2_async_nf_cleanup(&state->notifier);
917 v4l2_async_unregister_subdev(&state->sd);
918 icc:
919 imx8mq_mipi_csi_release_icc(pdev);
920 mutex:
921 mutex_destroy(&state->lock);
922
923 return ret;
924 }
925
imx8mq_mipi_csi_remove(struct platform_device * pdev)926 static void imx8mq_mipi_csi_remove(struct platform_device *pdev)
927 {
928 struct v4l2_subdev *sd = platform_get_drvdata(pdev);
929 struct csi_state *state = mipi_sd_to_csi2_state(sd);
930
931 v4l2_async_nf_unregister(&state->notifier);
932 v4l2_async_nf_cleanup(&state->notifier);
933 v4l2_async_unregister_subdev(&state->sd);
934
935 pm_runtime_disable(&pdev->dev);
936 imx8mq_mipi_csi_runtime_suspend(&pdev->dev);
937 media_entity_cleanup(&state->sd.entity);
938 v4l2_subdev_cleanup(&state->sd);
939 mutex_destroy(&state->lock);
940 pm_runtime_set_suspended(&pdev->dev);
941 imx8mq_mipi_csi_release_icc(pdev);
942 }
943
944 static const struct of_device_id imx8mq_mipi_csi_of_match[] = {
945 { .compatible = "fsl,imx8mq-mipi-csi2", },
946 { /* sentinel */ },
947 };
948 MODULE_DEVICE_TABLE(of, imx8mq_mipi_csi_of_match);
949
950 static struct platform_driver imx8mq_mipi_csi_driver = {
951 .probe = imx8mq_mipi_csi_probe,
952 .remove_new = imx8mq_mipi_csi_remove,
953 .driver = {
954 .of_match_table = imx8mq_mipi_csi_of_match,
955 .name = MIPI_CSI2_DRIVER_NAME,
956 .pm = &imx8mq_mipi_csi_pm_ops,
957 },
958 };
959
960 module_platform_driver(imx8mq_mipi_csi_driver);
961
962 MODULE_DESCRIPTION("i.MX8MQ MIPI CSI-2 receiver driver");
963 MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@puri.sm>");
964 MODULE_LICENSE("GPL v2");
965 MODULE_ALIAS("platform:imx8mq-mipi-csi2");
966
