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Merge tag 'input-for-v6.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...
[J-linux.git] / drivers / gpu / drm / imx / ipuv3 / imx-ldb.c
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/i2c.h>
11 #include <linux/media-bus-format.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_graph.h>
17 #include <linux/platform_device.h>
18 #include <linux/property.h>
19 #include <linux/regmap.h>
20 #include <linux/videodev2.h>
21
22 #include <video/of_display_timing.h>
23 #include <video/of_videomode.h>
24
25 #include <drm/drm_atomic.h>
26 #include <drm/drm_atomic_helper.h>
27 #include <drm/drm_bridge.h>
28 #include <drm/drm_edid.h>
29 #include <drm/drm_managed.h>
30 #include <drm/drm_of.h>
31 #include <drm/drm_panel.h>
32 #include <drm/drm_print.h>
33 #include <drm/drm_probe_helper.h>
34 #include <drm/drm_simple_kms_helper.h>
35
36 #include "imx-drm.h"
37
38 #define DRIVER_NAME "imx-ldb"
39
40 #define LDB_CH0_MODE_EN_TO_DI0          (1 << 0)
41 #define LDB_CH0_MODE_EN_TO_DI1          (3 << 0)
42 #define LDB_CH0_MODE_EN_MASK            (3 << 0)
43 #define LDB_CH1_MODE_EN_TO_DI0          (1 << 2)
44 #define LDB_CH1_MODE_EN_TO_DI1          (3 << 2)
45 #define LDB_CH1_MODE_EN_MASK            (3 << 2)
46 #define LDB_SPLIT_MODE_EN               (1 << 4)
47 #define LDB_DATA_WIDTH_CH0_24           (1 << 5)
48 #define LDB_BIT_MAP_CH0_JEIDA           (1 << 6)
49 #define LDB_DATA_WIDTH_CH1_24           (1 << 7)
50 #define LDB_BIT_MAP_CH1_JEIDA           (1 << 8)
51 #define LDB_DI0_VS_POL_ACT_LOW          (1 << 9)
52 #define LDB_DI1_VS_POL_ACT_LOW          (1 << 10)
53 #define LDB_BGREF_RMODE_INT             (1 << 15)
54
55 struct imx_ldb_channel;
56
57 struct imx_ldb_encoder {
58         struct drm_connector connector;
59         struct drm_encoder encoder;
60         struct imx_ldb_channel *channel;
61 };
62
63 struct imx_ldb;
64
65 struct imx_ldb_channel {
66         struct imx_ldb *ldb;
67
68         /* Defines what is connected to the ldb, only one at a time */
69         struct drm_panel *panel;
70         struct drm_bridge *bridge;
71
72         struct device_node *child;
73         struct i2c_adapter *ddc;
74         int chno;
75         const struct drm_edid *drm_edid;
76         struct drm_display_mode mode;
77         int mode_valid;
78         u32 bus_format;
79         u32 bus_flags;
80 };
81
82 static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c)
83 {
84         return container_of(c, struct imx_ldb_encoder, connector)->channel;
85 }
86
87 static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e)
88 {
89         return container_of(e, struct imx_ldb_encoder, encoder)->channel;
90 }
91
92 struct bus_mux {
93         int reg;
94         int shift;
95         int mask;
96 };
97
98 struct imx_ldb {
99         struct regmap *regmap;
100         struct device *dev;
101         struct imx_ldb_channel channel[2];
102         struct clk *clk[2]; /* our own clock */
103         struct clk *clk_sel[4]; /* parent of display clock */
104         struct clk *clk_parent[4]; /* original parent of clk_sel */
105         struct clk *clk_pll[2]; /* upstream clock we can adjust */
106         u32 ldb_ctrl;
107         const struct bus_mux *lvds_mux;
108 };
109
110 static 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
136 static 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;
140
141         num_modes = drm_panel_get_modes(imx_ldb_ch->panel, connector);
142         if (num_modes > 0)
143                 return num_modes;
144
145         if (!imx_ldb_ch->drm_edid && imx_ldb_ch->ddc) {
146                 imx_ldb_ch->drm_edid = drm_edid_read_ddc(connector,
147                                                          imx_ldb_ch->ddc);
148                 drm_edid_connector_update(connector, imx_ldb_ch->drm_edid);
149         }
150
151         if (imx_ldb_ch->drm_edid)
152                 num_modes = drm_edid_connector_add_modes(connector);
153
154         if (imx_ldb_ch->mode_valid) {
155                 struct drm_display_mode *mode;
156
157                 mode = drm_mode_duplicate(connector->dev, &imx_ldb_ch->mode);
158                 if (!mode)
159                         return -EINVAL;
160                 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
161                 drm_mode_probed_add(connector, mode);
162                 num_modes++;
163         }
164
165         return num_modes;
166 }
167
168 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
169                 unsigned long serial_clk, unsigned long di_clk)
170 {
171         int ret;
172
173         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
174                         clk_get_rate(ldb->clk_pll[chno]), serial_clk);
175         clk_set_rate(ldb->clk_pll[chno], serial_clk);
176
177         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
178                         clk_get_rate(ldb->clk_pll[chno]));
179
180         dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
181                         clk_get_rate(ldb->clk[chno]),
182                         (long int)di_clk);
183         clk_set_rate(ldb->clk[chno], di_clk);
184
185         dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
186                         clk_get_rate(ldb->clk[chno]));
187
188         /* set display clock mux to LDB input clock */
189         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
190         if (ret)
191                 dev_err(ldb->dev,
192                         "unable to set di%d parent clock to ldb_di%d\n", mux,
193                         chno);
194 }
195
196 static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
197 {
198         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
199         struct imx_ldb *ldb = imx_ldb_ch->ldb;
200         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
201         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
202
203         if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
204                 dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
205                 return;
206         }
207
208         drm_panel_prepare(imx_ldb_ch->panel);
209
210         if (dual) {
211                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]);
212                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]);
213
214                 clk_prepare_enable(ldb->clk[0]);
215                 clk_prepare_enable(ldb->clk[1]);
216         } else {
217                 clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]);
218         }
219
220         if (imx_ldb_ch == &ldb->channel[0] || dual) {
221                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
222                 if (mux == 0 || ldb->lvds_mux)
223                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
224                 else if (mux == 1)
225                         ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
226         }
227         if (imx_ldb_ch == &ldb->channel[1] || dual) {
228                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
229                 if (mux == 1 || ldb->lvds_mux)
230                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
231                 else if (mux == 0)
232                         ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
233         }
234
235         if (ldb->lvds_mux) {
236                 const struct bus_mux *lvds_mux = NULL;
237
238                 if (imx_ldb_ch == &ldb->channel[0])
239                         lvds_mux = &ldb->lvds_mux[0];
240                 else if (imx_ldb_ch == &ldb->channel[1])
241                         lvds_mux = &ldb->lvds_mux[1];
242
243                 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
244                                    mux << lvds_mux->shift);
245         }
246
247         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
248
249         drm_panel_enable(imx_ldb_ch->panel);
250 }
251
252 static void
253 imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
254                                 struct drm_crtc_state *crtc_state,
255                                 struct drm_connector_state *connector_state)
256 {
257         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
258         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
259         struct imx_ldb *ldb = imx_ldb_ch->ldb;
260         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
261         unsigned long serial_clk;
262         unsigned long di_clk = mode->clock * 1000;
263         int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
264         u32 bus_format = imx_ldb_ch->bus_format;
265
266         if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) {
267                 dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux);
268                 return;
269         }
270
271         if (mode->clock > 170000) {
272                 dev_warn(ldb->dev,
273                          "%s: mode exceeds 170 MHz pixel clock\n", __func__);
274         }
275         if (mode->clock > 85000 && !dual) {
276                 dev_warn(ldb->dev,
277                          "%s: mode exceeds 85 MHz pixel clock\n", __func__);
278         }
279
280         if (!IS_ALIGNED(mode->hdisplay, 8)) {
281                 dev_warn(ldb->dev,
282                          "%s: hdisplay does not align to 8 byte\n", __func__);
283         }
284
285         if (dual) {
286                 serial_clk = 3500UL * mode->clock;
287                 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
288                 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
289         } else {
290                 serial_clk = 7000UL * mode->clock;
291                 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
292                                   di_clk);
293         }
294
295         /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
296         if (imx_ldb_ch == &ldb->channel[0] || dual) {
297                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
298                         ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
299                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
300                         ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
301         }
302         if (imx_ldb_ch == &ldb->channel[1] || dual) {
303                 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
304                         ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
305                 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
306                         ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
307         }
308
309         if (!bus_format) {
310                 struct drm_connector *connector = connector_state->connector;
311                 struct drm_display_info *di = &connector->display_info;
312
313                 if (di->num_bus_formats)
314                         bus_format = di->bus_formats[0];
315         }
316         imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format);
317 }
318
319 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
320 {
321         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
322         struct imx_ldb *ldb = imx_ldb_ch->ldb;
323         int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
324         int mux, ret;
325
326         drm_panel_disable(imx_ldb_ch->panel);
327
328         if (imx_ldb_ch == &ldb->channel[0] || dual)
329                 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
330         if (imx_ldb_ch == &ldb->channel[1] || dual)
331                 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
332
333         regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
334
335         if (dual) {
336                 clk_disable_unprepare(ldb->clk[0]);
337                 clk_disable_unprepare(ldb->clk[1]);
338         }
339
340         if (ldb->lvds_mux) {
341                 const struct bus_mux *lvds_mux = NULL;
342
343                 if (imx_ldb_ch == &ldb->channel[0])
344                         lvds_mux = &ldb->lvds_mux[0];
345                 else if (imx_ldb_ch == &ldb->channel[1])
346                         lvds_mux = &ldb->lvds_mux[1];
347
348                 regmap_read(ldb->regmap, lvds_mux->reg, &mux);
349                 mux &= lvds_mux->mask;
350                 mux >>= lvds_mux->shift;
351         } else {
352                 mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1;
353         }
354
355         /* set display clock mux back to original input clock */
356         ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]);
357         if (ret)
358                 dev_err(ldb->dev,
359                         "unable to set di%d parent clock to original parent\n",
360                         mux);
361
362         drm_panel_unprepare(imx_ldb_ch->panel);
363 }
364
365 static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder,
366                                         struct drm_crtc_state *crtc_state,
367                                         struct drm_connector_state *conn_state)
368 {
369         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
370         struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
371         struct drm_display_info *di = &conn_state->connector->display_info;
372         u32 bus_format = imx_ldb_ch->bus_format;
373
374         /* Bus format description in DT overrides connector display info. */
375         if (!bus_format && di->num_bus_formats) {
376                 bus_format = di->bus_formats[0];
377                 imx_crtc_state->bus_flags = di->bus_flags;
378         } else {
379                 bus_format = imx_ldb_ch->bus_format;
380                 imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags;
381         }
382         switch (bus_format) {
383         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
384                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
385                 break;
386         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
387         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
388                 imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
389                 break;
390         default:
391                 return -EINVAL;
392         }
393
394         imx_crtc_state->di_hsync_pin = 2;
395         imx_crtc_state->di_vsync_pin = 3;
396
397         return 0;
398 }
399
400
401 static const struct drm_connector_funcs imx_ldb_connector_funcs = {
402         .fill_modes = drm_helper_probe_single_connector_modes,
403         .destroy = imx_drm_connector_destroy,
404         .reset = drm_atomic_helper_connector_reset,
405         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
406         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
407 };
408
409 static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
410         .get_modes = imx_ldb_connector_get_modes,
411 };
412
413 static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
414         .atomic_mode_set = imx_ldb_encoder_atomic_mode_set,
415         .enable = imx_ldb_encoder_enable,
416         .disable = imx_ldb_encoder_disable,
417         .atomic_check = imx_ldb_encoder_atomic_check,
418 };
419
420 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
421 {
422         char clkname[16];
423
424         snprintf(clkname, sizeof(clkname), "di%d", chno);
425         ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
426         if (IS_ERR(ldb->clk[chno]))
427                 return PTR_ERR(ldb->clk[chno]);
428
429         snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
430         ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
431
432         return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
433 }
434
435 static int imx_ldb_register(struct drm_device *drm,
436         struct imx_ldb_channel *imx_ldb_ch)
437 {
438         struct imx_ldb *ldb = imx_ldb_ch->ldb;
439         struct imx_ldb_encoder *ldb_encoder;
440         struct drm_connector *connector;
441         struct drm_encoder *encoder;
442         int ret;
443
444         ldb_encoder = drmm_simple_encoder_alloc(drm, struct imx_ldb_encoder,
445                                                 encoder, DRM_MODE_ENCODER_LVDS);
446         if (IS_ERR(ldb_encoder))
447                 return PTR_ERR(ldb_encoder);
448
449         ldb_encoder->channel = imx_ldb_ch;
450         connector = &ldb_encoder->connector;
451         encoder = &ldb_encoder->encoder;
452
453         ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child);
454         if (ret)
455                 return ret;
456
457         ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
458         if (ret)
459                 return ret;
460
461         if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
462                 ret = imx_ldb_get_clk(ldb, 1);
463                 if (ret)
464                         return ret;
465         }
466
467         drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs);
468
469         if (imx_ldb_ch->bridge) {
470                 ret = drm_bridge_attach(encoder, imx_ldb_ch->bridge, NULL, 0);
471                 if (ret)
472                         return ret;
473         } else {
474                 /*
475                  * We want to add the connector whenever there is no bridge
476                  * that brings its own, not only when there is a panel. For
477                  * historical reasons, the ldb driver can also work without
478                  * a panel.
479                  */
480                 drm_connector_helper_add(connector,
481                                          &imx_ldb_connector_helper_funcs);
482                 drm_connector_init_with_ddc(drm, connector,
483                                             &imx_ldb_connector_funcs,
484                                             DRM_MODE_CONNECTOR_LVDS,
485                                             imx_ldb_ch->ddc);
486                 drm_connector_attach_encoder(connector, encoder);
487         }
488
489         return 0;
490 }
491
492 struct imx_ldb_bit_mapping {
493         u32 bus_format;
494         u32 datawidth;
495         const char * const mapping;
496 };
497
498 static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
499         { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,  18, "spwg" },
500         { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG,  24, "spwg" },
501         { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
502 };
503
504 static u32 of_get_bus_format(struct device *dev, struct device_node *np)
505 {
506         const char *bm;
507         u32 datawidth = 0;
508         int ret, i;
509
510         ret = of_property_read_string(np, "fsl,data-mapping", &bm);
511         if (ret < 0)
512                 return ret;
513
514         of_property_read_u32(np, "fsl,data-width", &datawidth);
515
516         for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
517                 if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
518                     datawidth == imx_ldb_bit_mappings[i].datawidth)
519                         return imx_ldb_bit_mappings[i].bus_format;
520         }
521
522         dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
523
524         return -ENOENT;
525 }
526
527 static struct bus_mux imx6q_lvds_mux[2] = {
528         {
529                 .reg = IOMUXC_GPR3,
530                 .shift = 6,
531                 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
532         }, {
533                 .reg = IOMUXC_GPR3,
534                 .shift = 8,
535                 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
536         }
537 };
538
539 /*
540  * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
541  * of_match_device will walk through this list and take the first entry
542  * matching any of its compatible values. Therefore, the more generic
543  * entries (in this case fsl,imx53-ldb) need to be ordered last.
544  */
545 static const struct of_device_id imx_ldb_dt_ids[] = {
546         { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
547         { .compatible = "fsl,imx53-ldb", .data = NULL, },
548         { }
549 };
550 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
551
552 static int imx_ldb_panel_ddc(struct device *dev,
553                 struct imx_ldb_channel *channel, struct device_node *child)
554 {
555         struct device_node *ddc_node;
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                 const void *edidp;
570                 int edid_len;
571
572                 /* if no DDC available, fallback to hardcoded EDID */
573                 dev_dbg(dev, "no ddc available\n");
574
575                 edidp = of_get_property(child, "edid", &edid_len);
576                 if (edidp) {
577                         channel->drm_edid = drm_edid_alloc(edidp, edid_len);
578                         if (!channel->drm_edid)
579                                 return -ENOMEM;
580                 } else if (!channel->panel) {
581                         /* fallback to display-timings node */
582                         ret = of_get_drm_display_mode(child,
583                                                       &channel->mode,
584                                                       &channel->bus_flags,
585                                                       OF_USE_NATIVE_MODE);
586                         if (!ret)
587                                 channel->mode_valid = 1;
588                 }
589         }
590         return 0;
591 }
592
593 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
594 {
595         struct drm_device *drm = data;
596         struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
597         int ret;
598         int i;
599
600         for (i = 0; i < 2; i++) {
601                 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
602
603                 if (!channel->ldb)
604                         continue;
605
606                 ret = imx_ldb_register(drm, channel);
607                 if (ret)
608                         return ret;
609         }
610
611         return 0;
612 }
613
614 static const struct component_ops imx_ldb_ops = {
615         .bind   = imx_ldb_bind,
616 };
617
618 static int imx_ldb_probe(struct platform_device *pdev)
619 {
620         struct device *dev = &pdev->dev;
621         struct device_node *np = dev->of_node;
622         struct device_node *child;
623         struct imx_ldb *imx_ldb;
624         int dual;
625         int ret;
626         int i;
627
628         imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
629         if (!imx_ldb)
630                 return -ENOMEM;
631
632         imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
633         if (IS_ERR(imx_ldb->regmap)) {
634                 dev_err(dev, "failed to get parent regmap\n");
635                 return PTR_ERR(imx_ldb->regmap);
636         }
637
638         /* disable LDB by resetting the control register to POR default */
639         regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0);
640
641         imx_ldb->dev = dev;
642         imx_ldb->lvds_mux = device_get_match_data(dev);
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                 snprintf(clkname, sizeof(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
734 free_child:
735         of_node_put(child);
736         return ret;
737 }
738
739 static void 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                 drm_edid_free(channel->drm_edid);
748                 i2c_put_adapter(channel->ddc);
749         }
750
751         component_del(&pdev->dev, &imx_ldb_ops);
752 }
753
754 static struct platform_driver imx_ldb_driver = {
755         .probe          = imx_ldb_probe,
756         .remove_new     = imx_ldb_remove,
757         .driver         = {
758                 .of_match_table = imx_ldb_dt_ids,
759                 .name   = DRIVER_NAME,
760         },
761 };
762
763 module_platform_driver(imx_ldb_driver);
764
765 MODULE_DESCRIPTION("i.MX LVDS driver");
766 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
767 MODULE_LICENSE("GPL");
768 MODULE_ALIAS("platform:" DRIVER_NAME);
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