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1/*
2 * i.MX drm driver - LVDS display bridge
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/module.h>
17#include <linux/clk.h>
18#include <linux/component.h>
19#include <drm/drmP.h>
20#include <drm/drm_fb_helper.h>
21#include <drm/drm_crtc_helper.h>
22#include <drm/drm_of.h>
23#include <drm/drm_panel.h>
24#include <linux/mfd/syscon.h>
25#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
26#include <linux/of_device.h>
27#include <linux/of_graph.h>
28#include <video/of_videomode.h>
29#include <linux/regmap.h>
30#include <linux/videodev2.h>
31
32#include "imx-drm.h"
33
34#define DRIVER_NAME "imx-ldb"
35
36#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
37#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
38#define LDB_CH0_MODE_EN_MASK (3 << 0)
39#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
40#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
41#define LDB_CH1_MODE_EN_MASK (3 << 2)
42#define LDB_SPLIT_MODE_EN (1 << 4)
43#define LDB_DATA_WIDTH_CH0_24 (1 << 5)
44#define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
45#define LDB_DATA_WIDTH_CH1_24 (1 << 7)
46#define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
47#define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
48#define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
49#define LDB_BGREF_RMODE_INT (1 << 15)
50
51#define con_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, connector)
52#define enc_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, encoder)
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 struct drm_panel *panel;
61 struct device_node *child;
62 int chno;
63 void *edid;
64 int edid_len;
65 struct drm_display_mode mode;
66 int mode_valid;
67 int bus_format;
68};
69
70struct bus_mux {
71 int reg;
72 int shift;
73 int mask;
74};
75
76struct imx_ldb {
77 struct regmap *regmap;
78 struct device *dev;
79 struct imx_ldb_channel channel[2];
80 struct clk *clk[2]; /* our own clock */
81 struct clk *clk_sel[4]; /* parent of display clock */
82 struct clk *clk_parent[4]; /* original parent of clk_sel */
83 struct clk *clk_pll[2]; /* upstream clock we can adjust */
84 u32 ldb_ctrl;
85 const struct bus_mux *lvds_mux;
86};
87
88static enum drm_connector_status imx_ldb_connector_detect(
89 struct drm_connector *connector, bool force)
90{
91 return connector_status_connected;
92}
93
94static int imx_ldb_connector_get_modes(struct drm_connector *connector)
95{
96 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
97 int num_modes = 0;
98
99 if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
100 imx_ldb_ch->panel->funcs->get_modes) {
101 struct drm_display_info *di = &connector->display_info;
102
103 num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
104 if (!imx_ldb_ch->bus_format && di->num_bus_formats)
105 imx_ldb_ch->bus_format = di->bus_formats[0];
106 if (num_modes > 0)
107 return num_modes;
108 }
109
110 if (imx_ldb_ch->edid) {
111 drm_mode_connector_update_edid_property(connector,
112 imx_ldb_ch->edid);
113 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
114 }
115
116 if (imx_ldb_ch->mode_valid) {
117 struct drm_display_mode *mode;
118
119 mode = drm_mode_create(connector->dev);
120 if (!mode)
121 return -EINVAL;
122 drm_mode_copy(mode, &imx_ldb_ch->mode);
123 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
124 drm_mode_probed_add(connector, mode);
125 num_modes++;
126 }
127
128 return num_modes;
129}
130
131static struct drm_encoder *imx_ldb_connector_best_encoder(
132 struct drm_connector *connector)
133{
134 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
135
136 return &imx_ldb_ch->encoder;
137}
138
139static void imx_ldb_encoder_dpms(struct drm_encoder *encoder, int mode)
140{
141}
142
143static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
144 unsigned long serial_clk, unsigned long di_clk)
145{
146 int ret;
147
148 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
149 clk_get_rate(ldb->clk_pll[chno]), serial_clk);
150 clk_set_rate(ldb->clk_pll[chno], serial_clk);
151
152 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
153 clk_get_rate(ldb->clk_pll[chno]));
154
155 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
156 clk_get_rate(ldb->clk[chno]),
157 (long int)di_clk);
158 clk_set_rate(ldb->clk[chno], di_clk);
159
160 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
161 clk_get_rate(ldb->clk[chno]));
162
163 /* set display clock mux to LDB input clock */
164 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
165 if (ret)
166 dev_err(ldb->dev,
167 "unable to set di%d parent clock to ldb_di%d\n", mux,
168 chno);
169}
170
171static void imx_ldb_encoder_prepare(struct drm_encoder *encoder)
172{
173 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
174 struct imx_ldb *ldb = imx_ldb_ch->ldb;
175 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
176 u32 bus_format;
177
178 switch (imx_ldb_ch->bus_format) {
179 default:
180 dev_warn(ldb->dev,
181 "could not determine data mapping, default to 18-bit \"spwg\"\n");
182 /* fallthrough */
183 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
184 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
185 break;
186 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
187 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
188 if (imx_ldb_ch->chno == 0 || dual)
189 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
190 if (imx_ldb_ch->chno == 1 || dual)
191 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
192 break;
193 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
194 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
195 if (imx_ldb_ch->chno == 0 || dual)
196 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
197 LDB_BIT_MAP_CH0_JEIDA;
198 if (imx_ldb_ch->chno == 1 || dual)
199 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
200 LDB_BIT_MAP_CH1_JEIDA;
201 break;
202 }
203
204 imx_drm_set_bus_format(encoder, bus_format);
205}
206
207static void imx_ldb_encoder_commit(struct drm_encoder *encoder)
208{
209 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
210 struct imx_ldb *ldb = imx_ldb_ch->ldb;
211 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
212 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
213
214 drm_panel_prepare(imx_ldb_ch->panel);
215
216 if (dual) {
217 clk_prepare_enable(ldb->clk[0]);
218 clk_prepare_enable(ldb->clk[1]);
219 }
220
221 if (imx_ldb_ch == &ldb->channel[0] || dual) {
222 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
223 if (mux == 0 || ldb->lvds_mux)
224 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
225 else if (mux == 1)
226 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
227 }
228 if (imx_ldb_ch == &ldb->channel[1] || dual) {
229 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
230 if (mux == 1 || ldb->lvds_mux)
231 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
232 else if (mux == 0)
233 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
234 }
235
236 if (ldb->lvds_mux) {
237 const struct bus_mux *lvds_mux = NULL;
238
239 if (imx_ldb_ch == &ldb->channel[0])
240 lvds_mux = &ldb->lvds_mux[0];
241 else if (imx_ldb_ch == &ldb->channel[1])
242 lvds_mux = &ldb->lvds_mux[1];
243
244 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
245 mux << lvds_mux->shift);
246 }
247
248 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
249
250 drm_panel_enable(imx_ldb_ch->panel);
251}
252
253static void imx_ldb_encoder_mode_set(struct drm_encoder *encoder,
254 struct drm_display_mode *orig_mode,
255 struct drm_display_mode *mode)
256{
257 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
258 struct imx_ldb *ldb = imx_ldb_ch->ldb;
259 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
260 unsigned long serial_clk;
261 unsigned long di_clk = mode->clock * 1000;
262 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
263
264 if (mode->clock > 170000) {
265 dev_warn(ldb->dev,
266 "%s: mode exceeds 170 MHz pixel clock\n", __func__);
267 }
268 if (mode->clock > 85000 && !dual) {
269 dev_warn(ldb->dev,
270 "%s: mode exceeds 85 MHz pixel clock\n", __func__);
271 }
272
273 if (dual) {
274 serial_clk = 3500UL * mode->clock;
275 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
276 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
277 } else {
278 serial_clk = 7000UL * mode->clock;
279 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
280 di_clk);
281 }
282
283 /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
284 if (imx_ldb_ch == &ldb->channel[0]) {
285 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
286 ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
287 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
288 ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
289 }
290 if (imx_ldb_ch == &ldb->channel[1]) {
291 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
292 ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
293 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
294 ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
295 }
296}
297
298static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
299{
300 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
301 struct imx_ldb *ldb = imx_ldb_ch->ldb;
302 int mux, ret;
303
304 /*
305 * imx_ldb_encoder_disable is called by
306 * drm_helper_disable_unused_functions without
307 * the encoder being enabled before.
308 */
309 if (imx_ldb_ch == &ldb->channel[0] &&
310 (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
311 return;
312 else if (imx_ldb_ch == &ldb->channel[1] &&
313 (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
314 return;
315
316 drm_panel_disable(imx_ldb_ch->panel);
317
318 if (imx_ldb_ch == &ldb->channel[0])
319 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
320 else if (imx_ldb_ch == &ldb->channel[1])
321 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
322
323 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
324
325 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
326 clk_disable_unprepare(ldb->clk[0]);
327 clk_disable_unprepare(ldb->clk[1]);
328 }
329
330 if (ldb->lvds_mux) {
331 const struct bus_mux *lvds_mux = NULL;
332
333 if (imx_ldb_ch == &ldb->channel[0])
334 lvds_mux = &ldb->lvds_mux[0];
335 else if (imx_ldb_ch == &ldb->channel[1])
336 lvds_mux = &ldb->lvds_mux[1];
337
338 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
339 mux &= lvds_mux->mask;
340 mux >>= lvds_mux->shift;
341 } else {
342 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
343 }
344
345 /* set display clock mux back to original input clock */
346 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
347 if (ret)
348 dev_err(ldb->dev,
349 "unable to set di%d parent clock to original parent\n",
350 mux);
351
352 drm_panel_unprepare(imx_ldb_ch->panel);
353}
354
355static const struct drm_connector_funcs imx_ldb_connector_funcs = {
356 .dpms = drm_helper_connector_dpms,
357 .fill_modes = drm_helper_probe_single_connector_modes,
358 .detect = imx_ldb_connector_detect,
359 .destroy = imx_drm_connector_destroy,
360};
361
362static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
363 .get_modes = imx_ldb_connector_get_modes,
364 .best_encoder = imx_ldb_connector_best_encoder,
365};
366
367static const struct drm_encoder_funcs imx_ldb_encoder_funcs = {
368 .destroy = imx_drm_encoder_destroy,
369};
370
371static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
372 .dpms = imx_ldb_encoder_dpms,
373 .prepare = imx_ldb_encoder_prepare,
374 .commit = imx_ldb_encoder_commit,
375 .mode_set = imx_ldb_encoder_mode_set,
376 .disable = imx_ldb_encoder_disable,
377};
378
379static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
380{
381 char clkname[16];
382
383 snprintf(clkname, sizeof(clkname), "di%d", chno);
384 ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
385 if (IS_ERR(ldb->clk[chno]))
386 return PTR_ERR(ldb->clk[chno]);
387
388 snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
389 ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
390
391 return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
392}
393
394static int imx_ldb_register(struct drm_device *drm,
395 struct imx_ldb_channel *imx_ldb_ch)
396{
397 struct imx_ldb *ldb = imx_ldb_ch->ldb;
398 int ret;
399
400 ret = imx_drm_encoder_parse_of(drm, &imx_ldb_ch->encoder,
401 imx_ldb_ch->child);
402 if (ret)
403 return ret;
404
405 ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
406 if (ret)
407 return ret;
408
409 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
410 ret = imx_ldb_get_clk(ldb, 1);
411 if (ret)
412 return ret;
413 }
414
415 drm_encoder_helper_add(&imx_ldb_ch->encoder,
416 &imx_ldb_encoder_helper_funcs);
417 drm_encoder_init(drm, &imx_ldb_ch->encoder, &imx_ldb_encoder_funcs,
418 DRM_MODE_ENCODER_LVDS, NULL);
419
420 drm_connector_helper_add(&imx_ldb_ch->connector,
421 &imx_ldb_connector_helper_funcs);
422 drm_connector_init(drm, &imx_ldb_ch->connector,
423 &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
424
425 if (imx_ldb_ch->panel)
426 drm_panel_attach(imx_ldb_ch->panel, &imx_ldb_ch->connector);
427
428 drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
429 &imx_ldb_ch->encoder);
430
431 return 0;
432}
433
434enum {
435 LVDS_BIT_MAP_SPWG,
436 LVDS_BIT_MAP_JEIDA
437};
438
439struct imx_ldb_bit_mapping {
440 u32 bus_format;
441 u32 datawidth;
442 const char * const mapping;
443};
444
445static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
446 { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" },
447 { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" },
448 { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
449};
450
451static u32 of_get_bus_format(struct device *dev, struct device_node *np)
452{
453 const char *bm;
454 u32 datawidth = 0;
455 int ret, i;
456
457 ret = of_property_read_string(np, "fsl,data-mapping", &bm);
458 if (ret < 0)
459 return ret;
460
461 of_property_read_u32(np, "fsl,data-width", &datawidth);
462
463 for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
464 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
465 datawidth == imx_ldb_bit_mappings[i].datawidth)
466 return imx_ldb_bit_mappings[i].bus_format;
467 }
468
469 dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
470
471 return -ENOENT;
472}
473
474static struct bus_mux imx6q_lvds_mux[2] = {
475 {
476 .reg = IOMUXC_GPR3,
477 .shift = 6,
478 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
479 }, {
480 .reg = IOMUXC_GPR3,
481 .shift = 8,
482 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
483 }
484};
485
486/*
487 * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
488 * of_match_device will walk through this list and take the first entry
489 * matching any of its compatible values. Therefore, the more generic
490 * entries (in this case fsl,imx53-ldb) need to be ordered last.
491 */
492static const struct of_device_id imx_ldb_dt_ids[] = {
493 { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
494 { .compatible = "fsl,imx53-ldb", .data = NULL, },
495 { }
496};
497MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
498
499static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
500{
501 struct drm_device *drm = data;
502 struct device_node *np = dev->of_node;
503 const struct of_device_id *of_id =
504 of_match_device(imx_ldb_dt_ids, dev);
505 struct device_node *child;
506 const u8 *edidp;
507 struct imx_ldb *imx_ldb;
508 int dual;
509 int ret;
510 int i;
511
512 imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
513 if (!imx_ldb)
514 return -ENOMEM;
515
516 imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
517 if (IS_ERR(imx_ldb->regmap)) {
518 dev_err(dev, "failed to get parent regmap\n");
519 return PTR_ERR(imx_ldb->regmap);
520 }
521
522 imx_ldb->dev = dev;
523
524 if (of_id)
525 imx_ldb->lvds_mux = of_id->data;
526
527 dual = of_property_read_bool(np, "fsl,dual-channel");
528 if (dual)
529 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
530
531 /*
532 * There are three different possible clock mux configurations:
533 * i.MX53: ipu1_di0_sel, ipu1_di1_sel
534 * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
535 * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
536 * Map them all to di0_sel...di3_sel.
537 */
538 for (i = 0; i < 4; i++) {
539 char clkname[16];
540
541 sprintf(clkname, "di%d_sel", i);
542 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
543 if (IS_ERR(imx_ldb->clk_sel[i])) {
544 ret = PTR_ERR(imx_ldb->clk_sel[i]);
545 imx_ldb->clk_sel[i] = NULL;
546 break;
547 }
548
549 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
550 }
551 if (i == 0)
552 return ret;
553
554 for_each_child_of_node(np, child) {
555 struct imx_ldb_channel *channel;
556 struct device_node *port;
557
558 ret = of_property_read_u32(child, "reg", &i);
559 if (ret || i < 0 || i > 1)
560 return -EINVAL;
561
562 if (dual && i > 0) {
563 dev_warn(dev, "dual-channel mode, ignoring second output\n");
564 continue;
565 }
566
567 if (!of_device_is_available(child))
568 continue;
569
570 channel = &imx_ldb->channel[i];
571 channel->ldb = imx_ldb;
572 channel->chno = i;
573 channel->child = child;
574
575 /*
576 * The output port is port@4 with an external 4-port mux or
577 * port@2 with the internal 2-port mux.
578 */
579 port = of_graph_get_port_by_id(child, imx_ldb->lvds_mux ? 4 : 2);
580 if (port) {
581 struct device_node *endpoint, *remote;
582
583 endpoint = of_get_child_by_name(port, "endpoint");
584 if (endpoint) {
585 remote = of_graph_get_remote_port_parent(endpoint);
586 if (remote)
587 channel->panel = of_drm_find_panel(remote);
588 else
589 return -EPROBE_DEFER;
590 if (!channel->panel) {
591 dev_err(dev, "panel not found: %s\n",
592 remote->full_name);
593 return -EPROBE_DEFER;
594 }
595 }
596 }
597
598 edidp = of_get_property(child, "edid", &channel->edid_len);
599 if (edidp) {
600 channel->edid = kmemdup(edidp, channel->edid_len,
601 GFP_KERNEL);
602 } else if (!channel->panel) {
603 ret = of_get_drm_display_mode(child, &channel->mode, 0);
604 if (!ret)
605 channel->mode_valid = 1;
606 }
607
608 channel->bus_format = of_get_bus_format(dev, child);
609 if (channel->bus_format == -EINVAL) {
610 /*
611 * If no bus format was specified in the device tree,
612 * we can still get it from the connected panel later.
613 */
614 if (channel->panel && channel->panel->funcs &&
615 channel->panel->funcs->get_modes)
616 channel->bus_format = 0;
617 }
618 if (channel->bus_format < 0) {
619 dev_err(dev, "could not determine data mapping: %d\n",
620 channel->bus_format);
621 return channel->bus_format;
622 }
623
624 ret = imx_ldb_register(drm, channel);
625 if (ret)
626 return ret;
627 }
628
629 dev_set_drvdata(dev, imx_ldb);
630
631 return 0;
632}
633
634static void imx_ldb_unbind(struct device *dev, struct device *master,
635 void *data)
636{
637 struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
638 int i;
639
640 for (i = 0; i < 2; i++) {
641 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
642
643 if (!channel->connector.funcs)
644 continue;
645
646 channel->connector.funcs->destroy(&channel->connector);
647 channel->encoder.funcs->destroy(&channel->encoder);
648
649 kfree(channel->edid);
650 }
651}
652
653static const struct component_ops imx_ldb_ops = {
654 .bind = imx_ldb_bind,
655 .unbind = imx_ldb_unbind,
656};
657
658static int imx_ldb_probe(struct platform_device *pdev)
659{
660 return component_add(&pdev->dev, &imx_ldb_ops);
661}
662
663static int imx_ldb_remove(struct platform_device *pdev)
664{
665 component_del(&pdev->dev, &imx_ldb_ops);
666 return 0;
667}
668
669static struct platform_driver imx_ldb_driver = {
670 .probe = imx_ldb_probe,
671 .remove = imx_ldb_remove,
672 .driver = {
673 .of_match_table = imx_ldb_dt_ids,
674 .name = DRIVER_NAME,
675 },
676};
677
678module_platform_driver(imx_ldb_driver);
679
680MODULE_DESCRIPTION("i.MX LVDS driver");
681MODULE_AUTHOR("Sascha Hauer, Pengutronix");
682MODULE_LICENSE("GPL");
683MODULE_ALIAS("platform:" DRIVER_NAME);
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_bridge.h>
24#include <drm/drm_fb_helper.h>
25#include <drm/drm_managed.h>
26#include <drm/drm_of.h>
27#include <drm/drm_panel.h>
28#include <drm/drm_print.h>
29#include <drm/drm_probe_helper.h>
30#include <drm/drm_simple_kms_helper.h>
31
32#include "imx-drm.h"
33
34#define DRIVER_NAME "imx-ldb"
35
36#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
37#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
38#define LDB_CH0_MODE_EN_MASK (3 << 0)
39#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
40#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
41#define LDB_CH1_MODE_EN_MASK (3 << 2)
42#define LDB_SPLIT_MODE_EN (1 << 4)
43#define LDB_DATA_WIDTH_CH0_24 (1 << 5)
44#define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
45#define LDB_DATA_WIDTH_CH1_24 (1 << 7)
46#define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
47#define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
48#define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
49#define LDB_BGREF_RMODE_INT (1 << 15)
50
51struct imx_ldb_channel;
52
53struct imx_ldb_encoder {
54 struct drm_connector connector;
55 struct drm_encoder encoder;
56 struct imx_ldb_channel *channel;
57};
58
59struct imx_ldb;
60
61struct imx_ldb_channel {
62 struct imx_ldb *ldb;
63
64 /* Defines what is connected to the ldb, only one at a time */
65 struct drm_panel *panel;
66 struct drm_bridge *bridge;
67
68 struct device_node *child;
69 struct i2c_adapter *ddc;
70 int chno;
71 void *edid;
72 struct drm_display_mode mode;
73 int mode_valid;
74 u32 bus_format;
75 u32 bus_flags;
76};
77
78static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
79{
80 return container_of(c, struct imx_ldb_encoder, connector)->channel;
81}
82
83static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
84{
85 return container_of(e, struct imx_ldb_encoder, encoder)->channel;
86}
87
88struct bus_mux {
89 int reg;
90 int shift;
91 int mask;
92};
93
94struct imx_ldb {
95 struct regmap *regmap;
96 struct device *dev;
97 struct imx_ldb_channel channel[2];
98 struct clk *clk[2]; /* our own clock */
99 struct clk *clk_sel[4]; /* parent of display clock */
100 struct clk *clk_parent[4]; /* original parent of clk_sel */
101 struct clk *clk_pll[2]; /* upstream clock we can adjust */
102 u32 ldb_ctrl;
103 const struct bus_mux *lvds_mux;
104};
105
106static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch,
107 u32 bus_format)
108{
109 struct imx_ldb *ldb = imx_ldb_ch->ldb;
110 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
111
112 switch (bus_format) {
113 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
114 break;
115 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
116 if (imx_ldb_ch->chno == 0 || dual)
117 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
118 if (imx_ldb_ch->chno == 1 || dual)
119 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
120 break;
121 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
122 if (imx_ldb_ch->chno == 0 || dual)
123 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
124 LDB_BIT_MAP_CH0_JEIDA;
125 if (imx_ldb_ch->chno == 1 || dual)
126 ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
127 LDB_BIT_MAP_CH1_JEIDA;
128 break;
129 }
130}
131
132static int imx_ldb_connector_get_modes(struct drm_connector *connector)
133{
134 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
135 int num_modes;
136
137 num_modes = drm_panel_get_modes(imx_ldb_ch->panel, connector);
138 if (num_modes > 0)
139 return num_modes;
140
141 if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
142 imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
143
144 if (imx_ldb_ch->edid) {
145 drm_connector_update_edid_property(connector,
146 imx_ldb_ch->edid);
147 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
148 }
149
150 if (imx_ldb_ch->mode_valid) {
151 struct drm_display_mode *mode;
152
153 mode = drm_mode_create(connector->dev);
154 if (!mode)
155 return -EINVAL;
156 drm_mode_copy(mode, &imx_ldb_ch->mode);
157 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
158 drm_mode_probed_add(connector, mode);
159 num_modes++;
160 }
161
162 return num_modes;
163}
164
165static 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
193static 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 if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
201 dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
202 return;
203 }
204
205 drm_panel_prepare(imx_ldb_ch->panel);
206
207 if (dual) {
208 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
209 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
210
211 clk_prepare_enable(ldb->clk[0]);
212 clk_prepare_enable(ldb->clk[1]);
213 } else {
214 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
215 }
216
217 if (imx_ldb_ch == &ldb->channel[0] || dual) {
218 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
219 if (mux == 0 || ldb->lvds_mux)
220 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
221 else if (mux == 1)
222 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
223 }
224 if (imx_ldb_ch == &ldb->channel[1] || dual) {
225 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
226 if (mux == 1 || ldb->lvds_mux)
227 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
228 else if (mux == 0)
229 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
230 }
231
232 if (ldb->lvds_mux) {
233 const struct bus_mux *lvds_mux = NULL;
234
235 if (imx_ldb_ch == &ldb->channel[0])
236 lvds_mux = &ldb->lvds_mux[0];
237 else if (imx_ldb_ch == &ldb->channel[1])
238 lvds_mux = &ldb->lvds_mux[1];
239
240 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
241 mux << lvds_mux->shift);
242 }
243
244 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
245
246 drm_panel_enable(imx_ldb_ch->panel);
247}
248
249static void
250imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
251 struct drm_crtc_state *crtc_state,
252 struct drm_connector_state *connector_state)
253{
254 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
255 struct drm_display_mode *mode = &crtc_state->adjusted_mode;
256 struct imx_ldb *ldb = imx_ldb_ch->ldb;
257 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
258 unsigned long serial_clk;
259 unsigned long di_clk = mode->clock * 1000;
260 int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
261 u32 bus_format = imx_ldb_ch->bus_format;
262
263 if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
264 dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
265 return;
266 }
267
268 if (mode->clock > 170000) {
269 dev_warn(ldb->dev,
270 "%s: mode exceeds 170 MHz pixel clock\n", __func__);
271 }
272 if (mode->clock > 85000 && !dual) {
273 dev_warn(ldb->dev,
274 "%s: mode exceeds 85 MHz pixel clock\n", __func__);
275 }
276
277 if (!IS_ALIGNED(mode->hdisplay, 8)) {
278 dev_warn(ldb->dev,
279 "%s: hdisplay does not align to 8 byte\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 /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
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 dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
321 int mux, ret;
322
323 drm_panel_disable(imx_ldb_ch->panel);
324
325 if (imx_ldb_ch == &ldb->channel[0] || dual)
326 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
327 if (imx_ldb_ch == &ldb->channel[1] || dual)
328 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
329
330 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
331
332 if (dual) {
333 clk_disable_unprepare(ldb->clk[0]);
334 clk_disable_unprepare(ldb->clk[1]);
335 }
336
337 if (ldb->lvds_mux) {
338 const struct bus_mux *lvds_mux = NULL;
339
340 if (imx_ldb_ch == &ldb->channel[0])
341 lvds_mux = &ldb->lvds_mux[0];
342 else if (imx_ldb_ch == &ldb->channel[1])
343 lvds_mux = &ldb->lvds_mux[1];
344
345 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
346 mux &= lvds_mux->mask;
347 mux >>= lvds_mux->shift;
348 } else {
349 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
350 }
351
352 /* set display clock mux back to original input clock */
353 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
354 if (ret)
355 dev_err(ldb->dev,
356 "unable to set di%d parent clock to original parent\n",
357 mux);
358
359 drm_panel_unprepare(imx_ldb_ch->panel);
360}
361
362static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
363 struct drm_crtc_state *crtc_state,
364 struct drm_connector_state *conn_state)
365{
366 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
367 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
368 struct drm_display_info *di = &conn_state->connector->display_info;
369 u32 bus_format = imx_ldb_ch->bus_format;
370
371 /* Bus format description in DT overrides connector display info. */
372 if (!bus_format && di->num_bus_formats) {
373 bus_format = di->bus_formats[0];
374 imx_crtc_state->bus_flags = di->bus_flags;
375 } else {
376 bus_format = imx_ldb_ch->bus_format;
377 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
378 }
379 switch (bus_format) {
380 case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
381 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
382 break;
383 case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
384 case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
385 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
386 break;
387 default:
388 return -EINVAL;
389 }
390
391 imx_crtc_state->di_hsync_pin = 2;
392 imx_crtc_state->di_vsync_pin = 3;
393
394 return 0;
395}
396
397
398static const struct drm_connector_funcs imx_ldb_connector_funcs = {
399 .fill_modes = drm_helper_probe_single_connector_modes,
400 .destroy = imx_drm_connector_destroy,
401 .reset = drm_atomic_helper_connector_reset,
402 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
403 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
404};
405
406static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
407 .get_modes = imx_ldb_connector_get_modes,
408};
409
410static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
411 .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
412 .enable = imx_ldb_encoder_enable,
413 .disable = imx_ldb_encoder_disable,
414 .atomic_check = imx_ldb_encoder_atomic_check,
415};
416
417static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
418{
419 char clkname[16];
420
421 snprintf(clkname, sizeof(clkname), "di%d", chno);
422 ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
423 if (IS_ERR(ldb->clk[chno]))
424 return PTR_ERR(ldb->clk[chno]);
425
426 snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
427 ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
428
429 return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
430}
431
432static int imx_ldb_register(struct drm_device *drm,
433 struct imx_ldb_channel *imx_ldb_ch)
434{
435 struct imx_ldb *ldb = imx_ldb_ch->ldb;
436 struct imx_ldb_encoder *ldb_encoder;
437 struct drm_connector *connector;
438 struct drm_encoder *encoder;
439 int ret;
440
441 ldb_encoder = drmm_simple_encoder_alloc(drm, struct imx_ldb_encoder,
442 encoder, DRM_MODE_ENCODER_LVDS);
443 if (IS_ERR(ldb_encoder))
444 return PTR_ERR(ldb_encoder);
445
446 ldb_encoder->channel = imx_ldb_ch;
447 connector = &ldb_encoder->connector;
448 encoder = &ldb_encoder->encoder;
449
450 ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
451 if (ret)
452 return ret;
453
454 ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
455 if (ret)
456 return ret;
457
458 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
459 ret = imx_ldb_get_clk(ldb, 1);
460 if (ret)
461 return ret;
462 }
463
464 drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
465
466 if (imx_ldb_ch->bridge) {
467 ret = drm_bridge_attach(encoder, imx_ldb_ch->bridge, NULL, 0);
468 if (ret) {
469 DRM_ERROR("Failed to initialize bridge with drm\n");
470 return ret;
471 }
472 } else {
473 /*
474 * We want to add the connector whenever there is no bridge
475 * that brings its own, not only when there is a panel. For
476 * historical reasons, the ldb driver can also work without
477 * a panel.
478 */
479 drm_connector_helper_add(connector,
480 &imx_ldb_connector_helper_funcs);
481 drm_connector_init_with_ddc(drm, connector,
482 &imx_ldb_connector_funcs,
483 DRM_MODE_CONNECTOR_LVDS,
484 imx_ldb_ch->ddc);
485 drm_connector_attach_encoder(connector, encoder);
486 }
487
488 return 0;
489}
490
491struct imx_ldb_bit_mapping {
492 u32 bus_format;
493 u32 datawidth;
494 const char * const mapping;
495};
496
497static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
498 { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" },
499 { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" },
500 { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
501};
502
503static u32 of_get_bus_format(struct device *dev, struct device_node *np)
504{
505 const char *bm;
506 u32 datawidth = 0;
507 int ret, i;
508
509 ret = of_property_read_string(np, "fsl,data-mapping", &bm);
510 if (ret < 0)
511 return ret;
512
513 of_property_read_u32(np, "fsl,data-width", &datawidth);
514
515 for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
516 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
517 datawidth == imx_ldb_bit_mappings[i].datawidth)
518 return imx_ldb_bit_mappings[i].bus_format;
519 }
520
521 dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
522
523 return -ENOENT;
524}
525
526static struct bus_mux imx6q_lvds_mux[2] = {
527 {
528 .reg = IOMUXC_GPR3,
529 .shift = 6,
530 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
531 }, {
532 .reg = IOMUXC_GPR3,
533 .shift = 8,
534 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
535 }
536};
537
538/*
539 * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
540 * of_match_device will walk through this list and take the first entry
541 * matching any of its compatible values. Therefore, the more generic
542 * entries (in this case fsl,imx53-ldb) need to be ordered last.
543 */
544static const struct of_device_id imx_ldb_dt_ids[] = {
545 { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
546 { .compatible = "fsl,imx53-ldb", .data = NULL, },
547 { }
548};
549MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
550
551static int imx_ldb_panel_ddc(struct device *dev,
552 struct imx_ldb_channel *channel, struct device_node *child)
553{
554 struct device_node *ddc_node;
555 const u8 *edidp;
556 int ret;
557
558 ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
559 if (ddc_node) {
560 channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
561 of_node_put(ddc_node);
562 if (!channel->ddc) {
563 dev_warn(dev, "failed to get ddc i2c adapter\n");
564 return -EPROBE_DEFER;
565 }
566 }
567
568 if (!channel->ddc) {
569 int edid_len;
570
571 /* if no DDC available, fallback to hardcoded EDID */
572 dev_dbg(dev, "no ddc available\n");
573
574 edidp = of_get_property(child, "edid", &edid_len);
575 if (edidp) {
576 channel->edid = kmemdup(edidp, edid_len, GFP_KERNEL);
577 } else if (!channel->panel) {
578 /* fallback to display-timings node */
579 ret = of_get_drm_display_mode(child,
580 &channel->mode,
581 &channel->bus_flags,
582 OF_USE_NATIVE_MODE);
583 if (!ret)
584 channel->mode_valid = 1;
585 }
586 }
587 return 0;
588}
589
590static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
591{
592 struct drm_device *drm = data;
593 struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
594 int ret;
595 int i;
596
597 for (i = 0; i < 2; i++) {
598 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
599
600 if (!channel->ldb)
601 continue;
602
603 ret = imx_ldb_register(drm, channel);
604 if (ret)
605 return ret;
606 }
607
608 return 0;
609}
610
611static const struct component_ops imx_ldb_ops = {
612 .bind = imx_ldb_bind,
613};
614
615static int imx_ldb_probe(struct platform_device *pdev)
616{
617 struct device *dev = &pdev->dev;
618 struct device_node *np = dev->of_node;
619 const struct of_device_id *of_id = of_match_device(imx_ldb_dt_ids, dev);
620 struct device_node *child;
621 struct imx_ldb *imx_ldb;
622 int dual;
623 int ret;
624 int i;
625
626 imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
627 if (!imx_ldb)
628 return -ENOMEM;
629
630 imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
631 if (IS_ERR(imx_ldb->regmap)) {
632 dev_err(dev, "failed to get parent regmap\n");
633 return PTR_ERR(imx_ldb->regmap);
634 }
635
636 /* disable LDB by resetting the control register to POR default */
637 regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
638
639 imx_ldb->dev = dev;
640
641 if (of_id)
642 imx_ldb->lvds_mux = of_id->data;
643
644 dual = of_property_read_bool(np, "fsl,dual-channel");
645 if (dual)
646 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
647
648 /*
649 * There are three different possible clock mux configurations:
650 * i.MX53: ipu1_di0_sel, ipu1_di1_sel
651 * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
652 * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
653 * Map them all to di0_sel...di3_sel.
654 */
655 for (i = 0; i < 4; i++) {
656 char clkname[16];
657
658 sprintf(clkname, "di%d_sel", i);
659 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
660 if (IS_ERR(imx_ldb->clk_sel[i])) {
661 ret = PTR_ERR(imx_ldb->clk_sel[i]);
662 imx_ldb->clk_sel[i] = NULL;
663 break;
664 }
665
666 imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]);
667 }
668 if (i == 0)
669 return ret;
670
671 for_each_child_of_node(np, child) {
672 struct imx_ldb_channel *channel;
673 int bus_format;
674
675 ret = of_property_read_u32(child, "reg", &i);
676 if (ret || i < 0 || i > 1) {
677 ret = -EINVAL;
678 goto free_child;
679 }
680
681 if (!of_device_is_available(child))
682 continue;
683
684 if (dual && i > 0) {
685 dev_warn(dev, "dual-channel mode, ignoring second output\n");
686 continue;
687 }
688
689 channel = &imx_ldb->channel[i];
690 channel->ldb = imx_ldb;
691 channel->chno = i;
692
693 /*
694 * The output port is port@4 with an external 4-port mux or
695 * port@2 with the internal 2-port mux.
696 */
697 ret = drm_of_find_panel_or_bridge(child,
698 imx_ldb->lvds_mux ? 4 : 2, 0,
699 &channel->panel, &channel->bridge);
700 if (ret && ret != -ENODEV)
701 goto free_child;
702
703 /* panel ddc only if there is no bridge */
704 if (!channel->bridge) {
705 ret = imx_ldb_panel_ddc(dev, channel, child);
706 if (ret)
707 goto free_child;
708 }
709
710 bus_format = of_get_bus_format(dev, child);
711 if (bus_format == -EINVAL) {
712 /*
713 * If no bus format was specified in the device tree,
714 * we can still get it from the connected panel later.
715 */
716 if (channel->panel && channel->panel->funcs &&
717 channel->panel->funcs->get_modes)
718 bus_format = 0;
719 }
720 if (bus_format < 0) {
721 dev_err(dev, "could not determine data mapping: %d\n",
722 bus_format);
723 ret = bus_format;
724 goto free_child;
725 }
726 channel->bus_format = bus_format;
727 channel->child = child;
728 }
729
730 platform_set_drvdata(pdev, imx_ldb);
731
732 return component_add(&pdev->dev, &imx_ldb_ops);
733
734free_child:
735 of_node_put(child);
736 return ret;
737}
738
739static int imx_ldb_remove(struct platform_device *pdev)
740{
741 struct imx_ldb *imx_ldb = platform_get_drvdata(pdev);
742 int i;
743
744 for (i = 0; i < 2; i++) {
745 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
746
747 kfree(channel->edid);
748 i2c_put_adapter(channel->ddc);
749 }
750
751 component_del(&pdev->dev, &imx_ldb_ops);
752 return 0;
753}
754
755static struct platform_driver imx_ldb_driver = {
756 .probe = imx_ldb_probe,
757 .remove = imx_ldb_remove,
758 .driver = {
759 .of_match_table = imx_ldb_dt_ids,
760 .name = DRIVER_NAME,
761 },
762};
763
764module_platform_driver(imx_ldb_driver);
765
766MODULE_DESCRIPTION("i.MX LVDS driver");
767MODULE_AUTHOR("Sascha Hauer, Pengutronix");
768MODULE_LICENSE("GPL");
769MODULE_ALIAS("platform:" DRIVER_NAME);