1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * i.MX drm driver - LVDS display bridge
4 *
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 */
7
8 #include <linux/clk.h>
9 #include <linux/component.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
12 #include <linux/module.h>
13 #include <linux/of_device.h>
14 #include <linux/of_graph.h>
15 #include <linux/regmap.h>
16 #include <linux/videodev2.h>
17
18 #include <video/of_display_timing.h>
19 #include <video/of_videomode.h>
20
21 #include <drm/drm_atomic.h>
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_fb_helper.h>
24 #include <drm/drm_of.h>
25 #include <drm/drm_panel.h>
26 #include <drm/drm_print.h>
27 #include <drm/drm_probe_helper.h>
28
29 #include "imx-drm.h"
30
31 #define DRIVER_NAME "imx-ldb"
32
33 #define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
34 #define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
35 #define LDB_CH0_MODE_EN_MASK (3 << 0)
36 #define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
37 #define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
38 #define LDB_CH1_MODE_EN_MASK (3 << 2)
39 #define LDB_SPLIT_MODE_EN (1 << 4)
40 #define LDB_DATA_WIDTH_CH0_24 (1 << 5)
41 #define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
42 #define LDB_DATA_WIDTH_CH1_24 (1 << 7)
43 #define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
44 #define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
45 #define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
46 #define LDB_BGREF_RMODE_INT (1 << 15)
47
48 struct imx_ldb;
49
50 struct imx_ldb_channel {
51 struct imx_ldb *ldb;
52 struct drm_connector connector;
53 struct drm_encoder encoder;
54
55 /* Defines what is connected to the ldb, only one at a time */
56 struct drm_panel *panel;
57 struct drm_bridge *bridge;
58
59 struct device_node *child;
60 struct i2c_adapter *ddc;
61 int chno;
62 void *edid;
63 int edid_len;
64 struct drm_display_mode mode;
65 int mode_valid;
66 u32 bus_format;
67 u32 bus_flags;
68 };
69
con_to_imx_ldb_ch(struct drm_connector * c)70 static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
71 {
72 return container_of(c, struct imx_ldb_channel, connector);
73 }
74
enc_to_imx_ldb_ch(struct drm_encoder * e)75 static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
76 {
77 return container_of(e, struct imx_ldb_channel, encoder);
78 }
79
80 struct bus_mux {
81 int reg;
82 int shift;
83 int mask;
84 };
85
86 struct imx_ldb {
87 struct regmap *regmap;
88 struct device *dev;
89 struct imx_ldb_channel channel[2];
90 struct clk *clk[2]; /* our own clock */
91 struct clk *clk_sel[4]; /* parent of display clock */
92 struct clk *clk_parent[4]; /* original parent of clk_sel */
93 struct clk *clk_pll[2]; /* upstream clock we can adjust */
94 u32 ldb_ctrl;
95 const struct bus_mux *lvds_mux;
96 };
97
imx_ldb_ch_set_bus_format(struct imx_ldb_channel * imx_ldb_ch,u32 bus_format)98 static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch,
99 u32 bus_format)
100 {
101 struct imx_ldb *ldb = imx_ldb_ch->ldb;
102 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
103
104 switch (bus_format) {
105 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
106 break;
107 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
108 if (imx_ldb_ch->chno == 0 || dual)
109 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
110 if (imx_ldb_ch->chno == 1 || dual)
111 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
112 break;
113 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
114 if (imx_ldb_ch->chno == 0 || dual)
115 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
116 LDB_BIT_MAP_CH0_JEIDA;
117 if (imx_ldb_ch->chno == 1 || dual)
118 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
119 LDB_BIT_MAP_CH1_JEIDA;
120 break;
121 }
122 }
123
imx_ldb_connector_get_modes(struct drm_connector * connector)124 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
125 {
126 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
127 int num_modes;
128
129 num_modes = drm_panel_get_modes(imx_ldb_ch->panel);
130 if (num_modes > 0)
131 return num_modes;
132
133 if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
134 imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
135
136 if (imx_ldb_ch->edid) {
137 drm_connector_update_edid_property(connector,
138 imx_ldb_ch->edid);
139 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
140 }
141
142 if (imx_ldb_ch->mode_valid) {
143 struct drm_display_mode *mode;
144
145 mode = drm_mode_create(connector->dev);
146 if (!mode)
147 return -EINVAL;
148 drm_mode_copy(mode, &imx_ldb_ch->mode);
149 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
150 drm_mode_probed_add(connector, mode);
151 num_modes++;
152 }
153
154 return num_modes;
155 }
156
imx_ldb_connector_best_encoder(struct drm_connector * connector)157 static struct drm_encoder *imx_ldb_connector_best_encoder(
158 struct drm_connector *connector)
159 {
160 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
161
162 return &imx_ldb_ch->encoder;
163 }
164
imx_ldb_set_clock(struct imx_ldb * ldb,int mux,int chno,unsigned long serial_clk,unsigned long di_clk)165 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
166 unsigned long serial_clk, unsigned long di_clk)
167 {
168 int ret;
169
170 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
171 clk_get_rate(ldb->clk_pll[chno]), serial_clk);
172 clk_set_rate(ldb->clk_pll[chno], serial_clk);
173
174 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
175 clk_get_rate(ldb->clk_pll[chno]));
176
177 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
178 clk_get_rate(ldb->clk[chno]),
179 (long int)di_clk);
180 clk_set_rate(ldb->clk[chno], di_clk);
181
182 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
183 clk_get_rate(ldb->clk[chno]));
184
185 /* set display clock mux to LDB input clock */
186 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
187 if (ret)
188 dev_err(ldb->dev,
189 "unable to set di%d parent clock to ldb_di%d\n", mux,
190 chno);
191 }
192
imx_ldb_encoder_enable(struct drm_encoder * encoder)193 static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
194 {
195 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
196 struct imx_ldb *ldb = imx_ldb_ch->ldb;
197 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
198 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
199
200 drm_panel_prepare(imx_ldb_ch->panel);
201
202 if (dual) {
203 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
204 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
205
206 clk_prepare_enable(ldb->clk[0]);
207 clk_prepare_enable(ldb->clk[1]);
208 } else {
209 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
210 }
211
212 if (imx_ldb_ch == &ldb->channel[0] || dual) {
213 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
214 if (mux == 0 || ldb->lvds_mux)
215 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
216 else if (mux == 1)
217 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
218 }
219 if (imx_ldb_ch == &ldb->channel[1] || dual) {
220 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
221 if (mux == 1 || ldb->lvds_mux)
222 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
223 else if (mux == 0)
224 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
225 }
226
227 if (ldb->lvds_mux) {
228 const struct bus_mux *lvds_mux = NULL;
229
230 if (imx_ldb_ch == &ldb->channel[0])
231 lvds_mux = &ldb->lvds_mux[0];
232 else if (imx_ldb_ch == &ldb->channel[1])
233 lvds_mux = &ldb->lvds_mux[1];
234
235 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
236 mux << lvds_mux->shift);
237 }
238
239 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
240
241 drm_panel_enable(imx_ldb_ch->panel);
242 }
243
244 static void
imx_ldb_encoder_atomic_mode_set(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * connector_state)245 imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
246 struct drm_crtc_state *crtc_state,
247 struct drm_connector_state *connector_state)
248 {
249 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
250 struct drm_display_mode *mode = &crtc_state->adjusted_mode;
251 struct imx_ldb *ldb = imx_ldb_ch->ldb;
252 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
253 unsigned long serial_clk;
254 unsigned long di_clk = mode->clock * 1000;
255 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
256 u32 bus_format = imx_ldb_ch->bus_format;
257
258 if (mode->clock > 170000) {
259 dev_warn(ldb->dev,
260 "%s: mode exceeds 170 MHz pixel clock\n", __func__);
261 }
262 if (mode->clock > 85000 && !dual) {
263 dev_warn(ldb->dev,
264 "%s: mode exceeds 85 MHz pixel clock\n", __func__);
265 }
266
267 if (dual) {
268 serial_clk = 3500UL * mode->clock;
269 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
270 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
271 } else {
272 serial_clk = 7000UL * mode->clock;
273 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
274 di_clk);
275 }
276
277 /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
278 if (imx_ldb_ch == &ldb->channel[0] || dual) {
279 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
280 ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
281 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
282 ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
283 }
284 if (imx_ldb_ch == &ldb->channel[1] || dual) {
285 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
286 ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
287 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
288 ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
289 }
290
291 if (!bus_format) {
292 struct drm_connector *connector = connector_state->connector;
293 struct drm_display_info *di = &connector->display_info;
294
295 if (di->num_bus_formats)
296 bus_format = di->bus_formats[0];
297 }
298 imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
299 }
300
imx_ldb_encoder_disable(struct drm_encoder * encoder)301 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
302 {
303 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
304 struct imx_ldb *ldb = imx_ldb_ch->ldb;
305 int mux, ret;
306
307 drm_panel_disable(imx_ldb_ch->panel);
308
309 if (imx_ldb_ch == &ldb->channel[0])
310 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
311 else if (imx_ldb_ch == &ldb->channel[1])
312 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
313
314 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
315
316 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
317 clk_disable_unprepare(ldb->clk[0]);
318 clk_disable_unprepare(ldb->clk[1]);
319 }
320
321 if (ldb->lvds_mux) {
322 const struct bus_mux *lvds_mux = NULL;
323
324 if (imx_ldb_ch == &ldb->channel[0])
325 lvds_mux = &ldb->lvds_mux[0];
326 else if (imx_ldb_ch == &ldb->channel[1])
327 lvds_mux = &ldb->lvds_mux[1];
328
329 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
330 mux &= lvds_mux->mask;
331 mux >>= lvds_mux->shift;
332 } else {
333 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
334 }
335
336 /* set display clock mux back to original input clock */
337 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
338 if (ret)
339 dev_err(ldb->dev,
340 "unable to set di%d parent clock to original parent\n",
341 mux);
342
343 drm_panel_unprepare(imx_ldb_ch->panel);
344 }
345
imx_ldb_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)346 static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
347 struct drm_crtc_state *crtc_state,
348 struct drm_connector_state *conn_state)
349 {
350 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
351 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
352 struct drm_display_info *di = &conn_state->connector->display_info;
353 u32 bus_format = imx_ldb_ch->bus_format;
354
355 /* Bus format description in DT overrides connector display info. */
356 if (!bus_format && di->num_bus_formats) {
357 bus_format = di->bus_formats[0];
358 imx_crtc_state->bus_flags = di->bus_flags;
359 } else {
360 bus_format = imx_ldb_ch->bus_format;
361 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
362 }
363 switch (bus_format) {
364 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
365 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
366 break;
367 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
368 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
369 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
370 break;
371 default:
372 return -EINVAL;
373 }
374
375 imx_crtc_state->di_hsync_pin = 2;
376 imx_crtc_state->di_vsync_pin = 3;
377
378 return 0;
379 }
380
381
382 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
383 .fill_modes = drm_helper_probe_single_connector_modes,
384 .destroy = imx_drm_connector_destroy,
385 .reset = drm_atomic_helper_connector_reset,
386 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
387 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
388 };
389
390 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
391 .get_modes = imx_ldb_connector_get_modes,
392 .best_encoder = imx_ldb_connector_best_encoder,
393 };
394
395 static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
396 .destroy = imx_drm_encoder_destroy,
397 };
398
399 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
400 .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
401 .enable = imx_ldb_encoder_enable,
402 .disable = imx_ldb_encoder_disable,
403 .atomic_check = imx_ldb_encoder_atomic_check,
404 };
405
imx_ldb_get_clk(struct imx_ldb * ldb,int chno)406 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
407 {
408 char clkname[16];
409
410 snprintf(clkname, sizeof(clkname), "di%d", chno);
411 ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
412 if (IS_ERR(ldb->clk[chno]))
413 return PTR_ERR(ldb->clk[chno]);
414
415 snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
416 ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
417
418 return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
419 }
420
imx_ldb_register(struct drm_device * drm,struct imx_ldb_channel * imx_ldb_ch)421 static int imx_ldb_register(struct drm_device *drm,
422 struct imx_ldb_channel *imx_ldb_ch)
423 {
424 struct imx_ldb *ldb = imx_ldb_ch->ldb;
425 struct drm_encoder *encoder = &imx_ldb_ch->encoder;
426 int ret;
427
428 ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
429 if (ret)
430 return ret;
431
432 ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
433 if (ret)
434 return ret;
435
436 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
437 ret = imx_ldb_get_clk(ldb, 1);
438 if (ret)
439 return ret;
440 }
441
442 drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
443 drm_encoder_init(drm, encoder, &imx_ldb_encoder_funcs,
444 DRM_MODE_ENCODER_LVDS, NULL);
445
446 if (imx_ldb_ch->bridge) {
447 ret = drm_bridge_attach(&imx_ldb_ch->encoder,
448 imx_ldb_ch->bridge, NULL);
449 if (ret) {
450 DRM_ERROR("Failed to initialize bridge with drm\n");
451 return ret;
452 }
453 } else {
454 /*
455 * We want to add the connector whenever there is no bridge
456 * that brings its own, not only when there is a panel. For
457 * historical reasons, the ldb driver can also work without
458 * a panel.
459 */
460 drm_connector_helper_add(&imx_ldb_ch->connector,
461 &imx_ldb_connector_helper_funcs);
462 drm_connector_init_with_ddc(drm, &imx_ldb_ch->connector,
463 &imx_ldb_connector_funcs,
464 DRM_MODE_CONNECTOR_LVDS,
465 imx_ldb_ch->ddc);
466 drm_connector_attach_encoder(&imx_ldb_ch->connector, encoder);
467 }
468
469 if (imx_ldb_ch->panel) {
470 ret = drm_panel_attach(imx_ldb_ch->panel,
471 &imx_ldb_ch->connector);
472 if (ret)
473 return ret;
474 }
475
476 return 0;
477 }
478
479 enum {
480 LVDS_BIT_MAP_SPWG,
481 LVDS_BIT_MAP_JEIDA
482 };
483
484 struct imx_ldb_bit_mapping {
485 u32 bus_format;
486 u32 datawidth;
487 const char * const mapping;
488 };
489
490 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
491 { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" },
492 { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" },
493 { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
494 };
495
of_get_bus_format(struct device * dev,struct device_node * np)496 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
497 {
498 const char *bm;
499 u32 datawidth = 0;
500 int ret, i;
501
502 ret = of_property_read_string(np, "fsl,data-mapping", &bm);
503 if (ret < 0)
504 return ret;
505
506 of_property_read_u32(np, "fsl,data-width", &datawidth);
507
508 for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
509 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
510 datawidth == imx_ldb_bit_mappings[i].datawidth)
511 return imx_ldb_bit_mappings[i].bus_format;
512 }
513
514 dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
515
516 return -ENOENT;
517 }
518
519 static struct bus_mux imx6q_lvds_mux[2] = {
520 {
521 .reg = IOMUXC_GPR3,
522 .shift = 6,
523 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
524 }, {
525 .reg = IOMUXC_GPR3,
526 .shift = 8,
527 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
528 }
529 };
530
531 /*
532 * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
533 * of_match_device will walk through this list and take the first entry
534 * matching any of its compatible values. Therefore, the more generic
535 * entries (in this case fsl,imx53-ldb) need to be ordered last.
536 */
537 static const struct of_device_id imx_ldb_dt_ids[] = {
538 { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
539 { .compatible = "fsl,imx53-ldb", .data = NULL, },
540 { }
541 };
542 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
543
imx_ldb_panel_ddc(struct device * dev,struct imx_ldb_channel * channel,struct device_node * child)544 static int imx_ldb_panel_ddc(struct device *dev,
545 struct imx_ldb_channel *channel, struct device_node *child)
546 {
547 struct device_node *ddc_node;
548 const u8 *edidp;
549 int ret;
550
551 ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
552 if (ddc_node) {
553 channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
554 of_node_put(ddc_node);
555 if (!channel->ddc) {
556 dev_warn(dev, "failed to get ddc i2c adapter\n");
557 return -EPROBE_DEFER;
558 }
559 }
560
561 if (!channel->ddc) {
562 /* if no DDC available, fallback to hardcoded EDID */
563 dev_dbg(dev, "no ddc available\n");
564
565 edidp = of_get_property(child, "edid",
566 &channel->edid_len);
567 if (edidp) {
568 channel->edid = kmemdup(edidp,
569 channel->edid_len,
570 GFP_KERNEL);
571 } else if (!channel->panel) {
572 /* fallback to display-timings node */
573 ret = of_get_drm_display_mode(child,
574 &channel->mode,
575 &channel->bus_flags,
576 OF_USE_NATIVE_MODE);
577 if (!ret)
578 channel->mode_valid = 1;
579 }
580 }
581 return 0;
582 }
583
imx_ldb_bind(struct device * dev,struct device * master,void * data)584 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
585 {
586 struct drm_device *drm = data;
587 struct device_node *np = dev->of_node;
588 const struct of_device_id *of_id =
589 of_match_device(imx_ldb_dt_ids, dev);
590 struct device_node *child;
591 struct imx_ldb *imx_ldb;
592 int dual;
593 int ret;
594 int i;
595
596 imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
597 if (!imx_ldb)
598 return -ENOMEM;
599
600 imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
601 if (IS_ERR(imx_ldb->regmap)) {
602 dev_err(dev, "failed to get parent regmap\n");
603 return PTR_ERR(imx_ldb->regmap);
604 }
605
606 /* disable LDB by resetting the control register to POR default */
607 regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
608
609 imx_ldb->dev = dev;
610
611 if (of_id)
612 imx_ldb->lvds_mux = of_id->data;
613
614 dual = of_property_read_bool(np, "fsl,dual-channel");
615 if (dual)
616 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
617
618 /*
619 * There are three different possible clock mux configurations:
620 * i.MX53: ipu1_di0_sel, ipu1_di1_sel
621 * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
622 * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
623 * Map them all to di0_sel...di3_sel.
624 */
625 for (i = 0; i < 4; i++) {
626 char clkname[16];
627
628 sprintf(clkname, "di%d_sel", i);
629 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
630 if (IS_ERR(imx_ldb->clk_sel[i])) {
631 ret = PTR_ERR(imx_ldb->clk_sel[i]);
632 imx_ldb->clk_sel[i] = NULL;
633 break;
634 }
635
636 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
637 }
638 if (i == 0)
639 return ret;
640
641 for_each_child_of_node(np, child) {
642 struct imx_ldb_channel *channel;
643 int bus_format;
644
645 ret = of_property_read_u32(child, "reg", &i);
646 if (ret || i < 0 || i > 1) {
647 ret = -EINVAL;
648 goto free_child;
649 }
650
651 if (!of_device_is_available(child))
652 continue;
653
654 if (dual && i > 0) {
655 dev_warn(dev, "dual-channel mode, ignoring second output\n");
656 continue;
657 }
658
659 channel = &imx_ldb->channel[i];
660 channel->ldb = imx_ldb;
661 channel->chno = i;
662
663 /*
664 * The output port is port@4 with an external 4-port mux or
665 * port@2 with the internal 2-port mux.
666 */
667 ret = drm_of_find_panel_or_bridge(child,
668 imx_ldb->lvds_mux ? 4 : 2, 0,
669 &channel->panel, &channel->bridge);
670 if (ret && ret != -ENODEV)
671 goto free_child;
672
673 /* panel ddc only if there is no bridge */
674 if (!channel->bridge) {
675 ret = imx_ldb_panel_ddc(dev, channel, child);
676 if (ret)
677 goto free_child;
678 }
679
680 bus_format = of_get_bus_format(dev, child);
681 if (bus_format == -EINVAL) {
682 /*
683 * If no bus format was specified in the device tree,
684 * we can still get it from the connected panel later.
685 */
686 if (channel->panel && channel->panel->funcs &&
687 channel->panel->funcs->get_modes)
688 bus_format = 0;
689 }
690 if (bus_format < 0) {
691 dev_err(dev, "could not determine data mapping: %d\n",
692 bus_format);
693 ret = bus_format;
694 goto free_child;
695 }
696 channel->bus_format = bus_format;
697 channel->child = child;
698
699 ret = imx_ldb_register(drm, channel);
700 if (ret) {
701 channel->child = NULL;
702 goto free_child;
703 }
704 }
705
706 dev_set_drvdata(dev, imx_ldb);
707
708 return 0;
709
710 free_child:
711 of_node_put(child);
712 return ret;
713 }
714
imx_ldb_unbind(struct device * dev,struct device * master,void * data)715 static void imx_ldb_unbind(struct device *dev, struct device *master,
716 void *data)
717 {
718 struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
719 int i;
720
721 for (i = 0; i < 2; i++) {
722 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
723
724 if (channel->panel)
725 drm_panel_detach(channel->panel);
726
727 kfree(channel->edid);
728 i2c_put_adapter(channel->ddc);
729 }
730 }
731
732 static const struct component_ops imx_ldb_ops = {
733 .bind = imx_ldb_bind,
734 .unbind = imx_ldb_unbind,
735 };
736
imx_ldb_probe(struct platform_device * pdev)737 static int imx_ldb_probe(struct platform_device *pdev)
738 {
739 return component_add(&pdev->dev, &imx_ldb_ops);
740 }
741
imx_ldb_remove(struct platform_device * pdev)742 static int imx_ldb_remove(struct platform_device *pdev)
743 {
744 component_del(&pdev->dev, &imx_ldb_ops);
745 return 0;
746 }
747
748 static struct platform_driver imx_ldb_driver = {
749 .probe = imx_ldb_probe,
750 .remove = imx_ldb_remove,
751 .driver = {
752 .of_match_table = imx_ldb_dt_ids,
753 .name = DRIVER_NAME,
754 },
755 };
756
757 module_platform_driver(imx_ldb_driver);
758
759 MODULE_DESCRIPTION("i.MX LVDS driver");
760 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
761 MODULE_LICENSE("GPL");
762 MODULE_ALIAS("platform:" DRIVER_NAME);
763