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16#include <linux/module.h>
17#include <linux/clk.h>
18#include <linux/component.h>
19#include <drm/drmP.h>
20#include <drm/drm_atomic.h>
21#include <drm/drm_atomic_helper.h>
22#include <drm/drm_fb_helper.h>
23#include <drm/drm_crtc_helper.h>
24#include <drm/drm_of.h>
25#include <drm/drm_panel.h>
26#include <linux/mfd/syscon.h>
27#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
28#include <linux/of_device.h>
29#include <linux/of_graph.h>
30#include <video/of_display_timing.h>
31#include <video/of_videomode.h>
32#include <linux/regmap.h>
33#include <linux/videodev2.h>
34
35#include "imx-drm.h"
36
37#define DRIVER_NAME "imx-ldb"
38
39#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
40#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
41#define LDB_CH0_MODE_EN_MASK (3 << 0)
42#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
43#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
44#define LDB_CH1_MODE_EN_MASK (3 << 2)
45#define LDB_SPLIT_MODE_EN (1 << 4)
46#define LDB_DATA_WIDTH_CH0_24 (1 << 5)
47#define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
48#define LDB_DATA_WIDTH_CH1_24 (1 << 7)
49#define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
50#define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
51#define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
52#define LDB_BGREF_RMODE_INT (1 << 15)
53
54struct imx_ldb;
55
56struct imx_ldb_channel {
57 struct imx_ldb *ldb;
58 struct drm_connector connector;
59 struct drm_encoder encoder;
60
61
62 struct drm_panel *panel;
63 struct drm_bridge *bridge;
64
65 struct device_node *child;
66 struct i2c_adapter *ddc;
67 int chno;
68 void *edid;
69 int edid_len;
70 struct drm_display_mode mode;
71 int mode_valid;
72 u32 bus_format;
73 u32 bus_flags;
74};
75
76static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
77{
78 return container_of(c, struct imx_ldb_channel, connector);
79}
80
81static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
82{
83 return container_of(e, struct imx_ldb_channel, encoder);
84}
85
86struct bus_mux {
87 int reg;
88 int shift;
89 int mask;
90};
91
92struct imx_ldb {
93 struct regmap *regmap;
94 struct device *dev;
95 struct imx_ldb_channel channel[2];
96 struct clk *clk[2];
97 struct clk *clk_sel[4];
98 struct clk *clk_parent[4];
99 struct clk *clk_pll[2];
100 u32 ldb_ctrl;
101 const struct bus_mux *lvds_mux;
102};
103
104static enum drm_connector_status imx_ldb_connector_detect(
105 struct drm_connector *connector, bool force)
106{
107 return connector_status_connected;
108}
109
110static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch,
111 u32 bus_format)
112{
113 struct imx_ldb *ldb = imx_ldb_ch->ldb;
114 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
115
116 switch (bus_format) {
117 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
118 break;
119 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
120 if (imx_ldb_ch->chno == 0 || dual)
121 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
122 if (imx_ldb_ch->chno == 1 || dual)
123 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
124 break;
125 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
126 if (imx_ldb_ch->chno == 0 || dual)
127 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
128 LDB_BIT_MAP_CH0_JEIDA;
129 if (imx_ldb_ch->chno == 1 || dual)
130 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
131 LDB_BIT_MAP_CH1_JEIDA;
132 break;
133 }
134}
135
136static int imx_ldb_connector_get_modes(struct drm_connector *connector)
137{
138 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
139 int num_modes = 0;
140
141 if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
142 imx_ldb_ch->panel->funcs->get_modes) {
143 num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
144 if (num_modes > 0)
145 return num_modes;
146 }
147
148 if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
149 imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
150
151 if (imx_ldb_ch->edid) {
152 drm_mode_connector_update_edid_property(connector,
153 imx_ldb_ch->edid);
154 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
155 }
156
157 if (imx_ldb_ch->mode_valid) {
158 struct drm_display_mode *mode;
159
160 mode = drm_mode_create(connector->dev);
161 if (!mode)
162 return -EINVAL;
163 drm_mode_copy(mode, &imx_ldb_ch->mode);
164 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
165 drm_mode_probed_add(connector, mode);
166 num_modes++;
167 }
168
169 return num_modes;
170}
171
172static struct drm_encoder *imx_ldb_connector_best_encoder(
173 struct drm_connector *connector)
174{
175 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
176
177 return &imx_ldb_ch->encoder;
178}
179
180static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
181 unsigned long serial_clk, unsigned long di_clk)
182{
183 int ret;
184
185 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
186 clk_get_rate(ldb->clk_pll[chno]), serial_clk);
187 clk_set_rate(ldb->clk_pll[chno], serial_clk);
188
189 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
190 clk_get_rate(ldb->clk_pll[chno]));
191
192 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
193 clk_get_rate(ldb->clk[chno]),
194 (long int)di_clk);
195 clk_set_rate(ldb->clk[chno], di_clk);
196
197 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
198 clk_get_rate(ldb->clk[chno]));
199
200
201 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
202 if (ret)
203 dev_err(ldb->dev,
204 "unable to set di%d parent clock to ldb_di%d\n", mux,
205 chno);
206}
207
208static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
209{
210 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
211 struct imx_ldb *ldb = imx_ldb_ch->ldb;
212 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
213 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
214
215 drm_panel_prepare(imx_ldb_ch->panel);
216
217 if (dual) {
218 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
219 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
220
221 clk_prepare_enable(ldb->clk[0]);
222 clk_prepare_enable(ldb->clk[1]);
223 } else {
224 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
225 }
226
227 if (imx_ldb_ch == &ldb->channel[0] || dual) {
228 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
229 if (mux == 0 || ldb->lvds_mux)
230 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
231 else if (mux == 1)
232 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
233 }
234 if (imx_ldb_ch == &ldb->channel[1] || dual) {
235 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
236 if (mux == 1 || ldb->lvds_mux)
237 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
238 else if (mux == 0)
239 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
240 }
241
242 if (ldb->lvds_mux) {
243 const struct bus_mux *lvds_mux = NULL;
244
245 if (imx_ldb_ch == &ldb->channel[0])
246 lvds_mux = &ldb->lvds_mux[0];
247 else if (imx_ldb_ch == &ldb->channel[1])
248 lvds_mux = &ldb->lvds_mux[1];
249
250 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
251 mux << lvds_mux->shift);
252 }
253
254 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
255
256 drm_panel_enable(imx_ldb_ch->panel);
257}
258
259static void
260imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
261 struct drm_crtc_state *crtc_state,
262 struct drm_connector_state *connector_state)
263{
264 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
265 struct drm_display_mode *mode = &crtc_state->adjusted_mode;
266 struct imx_ldb *ldb = imx_ldb_ch->ldb;
267 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
268 unsigned long serial_clk;
269 unsigned long di_clk = mode->clock * 1000;
270 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
271 u32 bus_format = imx_ldb_ch->bus_format;
272
273 if (mode->clock > 170000) {
274 dev_warn(ldb->dev,
275 "%s: mode exceeds 170 MHz pixel clock\n", __func__);
276 }
277 if (mode->clock > 85000 && !dual) {
278 dev_warn(ldb->dev,
279 "%s: mode exceeds 85 MHz pixel clock\n", __func__);
280 }
281
282 if (dual) {
283 serial_clk = 3500UL * mode->clock;
284 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
285 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
286 } else {
287 serial_clk = 7000UL * mode->clock;
288 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
289 di_clk);
290 }
291
292
293 if (imx_ldb_ch == &ldb->channel[0] || dual) {
294 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
295 ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
296 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
297 ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
298 }
299 if (imx_ldb_ch == &ldb->channel[1] || dual) {
300 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
301 ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
302 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
303 ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
304 }
305
306 if (!bus_format) {
307 struct drm_connector *connector = connector_state->connector;
308 struct drm_display_info *di = &connector->display_info;
309
310 if (di->num_bus_formats)
311 bus_format = di->bus_formats[0];
312 }
313 imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
314}
315
316static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
317{
318 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
319 struct imx_ldb *ldb = imx_ldb_ch->ldb;
320 int mux, ret;
321
322
323
324
325
326
327 if (imx_ldb_ch == &ldb->channel[0] &&
328 (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
329 return;
330 else if (imx_ldb_ch == &ldb->channel[1] &&
331 (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
332 return;
333
334 drm_panel_disable(imx_ldb_ch->panel);
335
336 if (imx_ldb_ch == &ldb->channel[0])
337 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
338 else if (imx_ldb_ch == &ldb->channel[1])
339 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
340
341 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
342
343 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
344 clk_disable_unprepare(ldb->clk[0]);
345 clk_disable_unprepare(ldb->clk[1]);
346 }
347
348 if (ldb->lvds_mux) {
349 const struct bus_mux *lvds_mux = NULL;
350
351 if (imx_ldb_ch == &ldb->channel[0])
352 lvds_mux = &ldb->lvds_mux[0];
353 else if (imx_ldb_ch == &ldb->channel[1])
354 lvds_mux = &ldb->lvds_mux[1];
355
356 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
357 mux &= lvds_mux->mask;
358 mux >>= lvds_mux->shift;
359 } else {
360 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
361 }
362
363
364 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
365 if (ret)
366 dev_err(ldb->dev,
367 "unable to set di%d parent clock to original parent\n",
368 mux);
369
370 drm_panel_unprepare(imx_ldb_ch->panel);
371}
372
373static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
374 struct drm_crtc_state *crtc_state,
375 struct drm_connector_state *conn_state)
376{
377 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
378 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
379 struct drm_display_info *di = &conn_state->connector->display_info;
380 u32 bus_format = imx_ldb_ch->bus_format;
381
382
383 if (!bus_format && di->num_bus_formats) {
384 bus_format = di->bus_formats[0];
385 imx_crtc_state->bus_flags = di->bus_flags;
386 } else {
387 bus_format = imx_ldb_ch->bus_format;
388 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
389 }
390 switch (bus_format) {
391 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
392 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
393 break;
394 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
395 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
396 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
397 break;
398 default:
399 return -EINVAL;
400 }
401
402 imx_crtc_state->di_hsync_pin = 2;
403 imx_crtc_state->di_vsync_pin = 3;
404
405 return 0;
406}
407
408
409static const struct drm_connector_funcs imx_ldb_connector_funcs = {
410 .dpms = drm_atomic_helper_connector_dpms,
411 .fill_modes = drm_helper_probe_single_connector_modes,
412 .detect = imx_ldb_connector_detect,
413 .destroy = imx_drm_connector_destroy,
414 .reset = drm_atomic_helper_connector_reset,
415 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
416 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
417};
418
419static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
420 .get_modes = imx_ldb_connector_get_modes,
421 .best_encoder = imx_ldb_connector_best_encoder,
422};
423
424static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
425 .destroy = imx_drm_encoder_destroy,
426};
427
428static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
429 .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
430 .enable = imx_ldb_encoder_enable,
431 .disable = imx_ldb_encoder_disable,
432 .atomic_check = imx_ldb_encoder_atomic_check,
433};
434
435static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
436{
437 char clkname[16];
438
439 snprintf(clkname, sizeof(clkname), "di%d", chno);
440 ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
441 if (IS_ERR(ldb->clk[chno]))
442 return PTR_ERR(ldb->clk[chno]);
443
444 snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
445 ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
446
447 return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
448}
449
450static int imx_ldb_register(struct drm_device *drm,
451 struct imx_ldb_channel *imx_ldb_ch)
452{
453 struct imx_ldb *ldb = imx_ldb_ch->ldb;
454 struct drm_encoder *encoder = &imx_ldb_ch->encoder;
455 int ret;
456
457 ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
458 if (ret)
459 return ret;
460
461 ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
462 if (ret)
463 return ret;
464
465 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
466 ret = imx_ldb_get_clk(ldb, 1);
467 if (ret)
468 return ret;
469 }
470
471 drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
472 drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
473 DRM_MODE_ENCODER_LVDS, NULL);
474
475 if (imx_ldb_ch->bridge) {
476 imx_ldb_ch->bridge->encoder = encoder;
477
478 imx_ldb_ch->encoder.bridge = imx_ldb_ch->bridge;
479 ret = drm_bridge_attach(drm, imx_ldb_ch->bridge);
480 if (ret) {
481 DRM_ERROR("Failed to initialize bridge with drm\n");
482 return ret;
483 }
484 } else {
485
486
487
488
489
490
491 drm_connector_helper_add(&imx_ldb_ch->connector,
492 &imx_ldb_connector_helper_funcs);
493 drm_connector_init(drm, &imx_ldb_ch->connector,
494 &imx_ldb_connector_funcs,
495 DRM_MODE_CONNECTOR_LVDS);
496 drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
497 encoder);
498 }
499
500 if (imx_ldb_ch->panel) {
501 ret = drm_panel_attach(imx_ldb_ch->panel,
502 &imx_ldb_ch->connector);
503 if (ret)
504 return ret;
505 }
506
507 return 0;
508}
509
510enum {
511 LVDS_BIT_MAP_SPWG,
512 LVDS_BIT_MAP_JEIDA
513};
514
515struct imx_ldb_bit_mapping {
516 u32 bus_format;
517 u32 datawidth;
518 const char * const mapping;
519};
520
521static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
522 { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" },
523 { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" },
524 { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
525};
526
527static u32 of_get_bus_format(struct device *dev, struct device_node *np)
528{
529 const char *bm;
530 u32 datawidth = 0;
531 int ret, i;
532
533 ret = of_property_read_string(np, "fsl,data-mapping", &bm);
534 if (ret < 0)
535 return ret;
536
537 of_property_read_u32(np, "fsl,data-width", &datawidth);
538
539 for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
540 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
541 datawidth == imx_ldb_bit_mappings[i].datawidth)
542 return imx_ldb_bit_mappings[i].bus_format;
543 }
544
545 dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
546
547 return -ENOENT;
548}
549
550static struct bus_mux imx6q_lvds_mux[2] = {
551 {
552 .reg = IOMUXC_GPR3,
553 .shift = 6,
554 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
555 }, {
556 .reg = IOMUXC_GPR3,
557 .shift = 8,
558 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
559 }
560};
561
562
563
564
565
566
567
568static const struct of_device_id imx_ldb_dt_ids[] = {
569 { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
570 { .compatible = "fsl,imx53-ldb", .data = NULL, },
571 { }
572};
573MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
574
575static int imx_ldb_panel_ddc(struct device *dev,
576 struct imx_ldb_channel *channel, struct device_node *child)
577{
578 struct device_node *ddc_node;
579 const u8 *edidp;
580 int ret;
581
582 ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
583 if (ddc_node) {
584 channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
585 of_node_put(ddc_node);
586 if (!channel->ddc) {
587 dev_warn(dev, "failed to get ddc i2c adapter\n");
588 return -EPROBE_DEFER;
589 }
590 }
591
592 if (!channel->ddc) {
593
594 dev_dbg(dev, "no ddc available\n");
595
596 edidp = of_get_property(child, "edid",
597 &channel->edid_len);
598 if (edidp) {
599 channel->edid = kmemdup(edidp,
600 channel->edid_len,
601 GFP_KERNEL);
602 } else if (!channel->panel) {
603
604 ret = of_get_drm_display_mode(child,
605 &channel->mode,
606 &channel->bus_flags,
607 OF_USE_NATIVE_MODE);
608 if (!ret)
609 channel->mode_valid = 1;
610 }
611 }
612 return 0;
613}
614
615static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
616{
617 struct drm_device *drm = data;
618 struct device_node *np = dev->of_node;
619 const struct of_device_id *of_id =
620 of_match_device(imx_ldb_dt_ids, dev);
621 struct device_node *child;
622 struct imx_ldb *imx_ldb;
623 int dual;
624 int ret;
625 int i;
626
627 imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
628 if (!imx_ldb)
629 return -ENOMEM;
630
631 imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
632 if (IS_ERR(imx_ldb->regmap)) {
633 dev_err(dev, "failed to get parent regmap\n");
634 return PTR_ERR(imx_ldb->regmap);
635 }
636
637 imx_ldb->dev = dev;
638
639 if (of_id)
640 imx_ldb->lvds_mux = of_id->data;
641
642 dual = of_property_read_bool(np, "fsl,dual-channel");
643 if (dual)
644 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
645
646
647
648
649
650
651
652
653 for (i = 0; i < 4; i++) {
654 char clkname[16];
655
656 sprintf(clkname, "di%d_sel", i);
657 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
658 if (IS_ERR(imx_ldb->clk_sel[i])) {
659 ret = PTR_ERR(imx_ldb->clk_sel[i]);
660 imx_ldb->clk_sel[i] = NULL;
661 break;
662 }
663
664 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
665 }
666 if (i == 0)
667 return ret;
668
669 for_each_child_of_node(np, child) {
670 struct imx_ldb_channel *channel;
671 struct device_node *ep;
672 int bus_format;
673
674 ret = of_property_read_u32(child, "reg", &i);
675 if (ret || i < 0 || i > 1)
676 return -EINVAL;
677
678 if (dual && i > 0) {
679 dev_warn(dev, "dual-channel mode, ignoring second output\n");
680 continue;
681 }
682
683 if (!of_device_is_available(child))
684 continue;
685
686 channel = &imx_ldb->channel[i];
687 channel->ldb = imx_ldb;
688 channel->chno = i;
689 channel->child = child;
690
691
692
693
694
695 ep = of_graph_get_endpoint_by_regs(child,
696 imx_ldb->lvds_mux ? 4 : 2,
697 -1);
698 if (ep) {
699 struct device_node *remote;
700
701 remote = of_graph_get_remote_port_parent(ep);
702 of_node_put(ep);
703 if (remote) {
704 channel->panel = of_drm_find_panel(remote);
705 channel->bridge = of_drm_find_bridge(remote);
706 } else
707 return -EPROBE_DEFER;
708 of_node_put(remote);
709
710 if (!channel->panel && !channel->bridge) {
711 dev_err(dev, "panel/bridge not found: %s\n",
712 remote->full_name);
713 return -EPROBE_DEFER;
714 }
715 }
716
717
718 if (!channel->bridge) {
719 ret = imx_ldb_panel_ddc(dev, channel, child);
720 if (ret)
721 return ret;
722 }
723
724 bus_format = of_get_bus_format(dev, child);
725 if (bus_format == -EINVAL) {
726
727
728
729
730 if (channel->panel && channel->panel->funcs &&
731 channel->panel->funcs->get_modes)
732 bus_format = 0;
733 }
734 if (bus_format < 0) {
735 dev_err(dev, "could not determine data mapping: %d\n",
736 bus_format);
737 return bus_format;
738 }
739 channel->bus_format = bus_format;
740
741 ret = imx_ldb_register(drm, channel);
742 if (ret)
743 return ret;
744 }
745
746 dev_set_drvdata(dev, imx_ldb);
747
748 return 0;
749}
750
751static void imx_ldb_unbind(struct device *dev, struct device *master,
752 void *data)
753{
754 struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
755 int i;
756
757 for (i = 0; i < 2; i++) {
758 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
759
760 if (channel->bridge)
761 drm_bridge_detach(channel->bridge);
762 if (channel->panel)
763 drm_panel_detach(channel->panel);
764
765 kfree(channel->edid);
766 i2c_put_adapter(channel->ddc);
767 }
768}
769
770static const struct component_ops imx_ldb_ops = {
771 .bind = imx_ldb_bind,
772 .unbind = imx_ldb_unbind,
773};
774
775static int imx_ldb_probe(struct platform_device *pdev)
776{
777 return component_add(&pdev->dev, &imx_ldb_ops);
778}
779
780static int imx_ldb_remove(struct platform_device *pdev)
781{
782 component_del(&pdev->dev, &imx_ldb_ops);
783 return 0;
784}
785
786static struct platform_driver imx_ldb_driver = {
787 .probe = imx_ldb_probe,
788 .remove = imx_ldb_remove,
789 .driver = {
790 .of_match_table = imx_ldb_dt_ids,
791 .name = DRIVER_NAME,
792 },
793};
794
795module_platform_driver(imx_ldb_driver);
796
797MODULE_DESCRIPTION("i.MX LVDS driver");
798MODULE_AUTHOR("Sascha Hauer, Pengutronix");
799MODULE_LICENSE("GPL");
800MODULE_ALIAS("platform:" DRIVER_NAME);
801
