2 * i.MX drm driver - LVDS display bridge
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
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.
16 #include <linux/module.h>
17 #include <linux/clk.h>
18 #include <linux/component.h>
20 #include <drm/drm_fb_helper.h>
21 #include <drm/drm_crtc_helper.h>
22 #include <linux/mfd/syscon.h>
23 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
24 #include <linux/of_address.h>
25 #include <linux/of_device.h>
26 #include <video/of_videomode.h>
27 #include <linux/regmap.h>
28 #include <linux/videodev2.h>
32 #define DRIVER_NAME "imx-ldb"
34 #define LDB_CH0_MODE_EN_TO_DI0 (1 << 0)
35 #define LDB_CH0_MODE_EN_TO_DI1 (3 << 0)
36 #define LDB_CH0_MODE_EN_MASK (3 << 0)
37 #define LDB_CH1_MODE_EN_TO_DI0 (1 << 2)
38 #define LDB_CH1_MODE_EN_TO_DI1 (3 << 2)
39 #define LDB_CH1_MODE_EN_MASK (3 << 2)
40 #define LDB_SPLIT_MODE_EN (1 << 4)
41 #define LDB_DATA_WIDTH_CH0_24 (1 << 5)
42 #define LDB_BIT_MAP_CH0_JEIDA (1 << 6)
43 #define LDB_DATA_WIDTH_CH1_24 (1 << 7)
44 #define LDB_BIT_MAP_CH1_JEIDA (1 << 8)
45 #define LDB_DI0_VS_POL_ACT_LOW (1 << 9)
46 #define LDB_DI1_VS_POL_ACT_LOW (1 << 10)
47 #define LDB_BGREF_RMODE_INT (1 << 15)
49 #define con_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, connector)
50 #define enc_to_imx_ldb_ch(x) container_of(x, struct imx_ldb_channel, encoder)
54 struct imx_ldb_channel {
56 struct drm_connector connector;
57 struct drm_encoder encoder;
58 struct device_node *child;
62 struct drm_display_mode mode;
73 struct regmap *regmap;
75 struct imx_ldb_channel channel[2];
76 struct clk *clk[2]; /* our own clock */
77 struct clk *clk_sel[4]; /* parent of display clock */
78 struct clk *clk_pll[2]; /* upstream clock we can adjust */
80 const struct bus_mux *lvds_mux;
83 static enum drm_connector_status imx_ldb_connector_detect(
84 struct drm_connector *connector, bool force)
86 return connector_status_connected;
89 static int imx_ldb_connector_get_modes(struct drm_connector *connector)
91 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
94 if (imx_ldb_ch->edid) {
95 drm_mode_connector_update_edid_property(connector,
97 num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid);
100 if (imx_ldb_ch->mode_valid) {
101 struct drm_display_mode *mode;
103 mode = drm_mode_create(connector->dev);
106 drm_mode_copy(mode, &imx_ldb_ch->mode);
107 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
108 drm_mode_probed_add(connector, mode);
115 static struct drm_encoder *imx_ldb_connector_best_encoder(
116 struct drm_connector *connector)
118 struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector);
120 return &imx_ldb_ch->encoder;
123 static void imx_ldb_encoder_dpms(struct drm_encoder *encoder, int mode)
127 static bool imx_ldb_encoder_mode_fixup(struct drm_encoder *encoder,
128 const struct drm_display_mode *mode,
129 struct drm_display_mode *adjusted_mode)
134 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
135 unsigned long serial_clk, unsigned long di_clk)
139 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
140 clk_get_rate(ldb->clk_pll[chno]), serial_clk);
141 clk_set_rate(ldb->clk_pll[chno], serial_clk);
143 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
144 clk_get_rate(ldb->clk_pll[chno]));
146 dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__,
147 clk_get_rate(ldb->clk[chno]),
149 clk_set_rate(ldb->clk[chno], di_clk);
151 dev_dbg(ldb->dev, "%s after: %ld\n", __func__,
152 clk_get_rate(ldb->clk[chno]));
154 /* set display clock mux to LDB input clock */
155 ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]);
158 "unable to set di%d parent clock to ldb_di%d\n", mux,
162 static void imx_ldb_encoder_prepare(struct drm_encoder *encoder)
164 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
165 struct imx_ldb *ldb = imx_ldb_ch->ldb;
166 struct drm_display_mode *mode = &encoder->crtc->mode;
168 unsigned long serial_clk;
169 unsigned long di_clk = mode->clock * 1000;
170 int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
172 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
173 /* dual channel LVDS mode */
174 serial_clk = 3500UL * mode->clock;
175 imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk);
176 imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk);
178 serial_clk = 7000UL * mode->clock;
179 imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk,
183 switch (imx_ldb_ch->chno) {
185 pixel_fmt = (ldb->ldb_ctrl & LDB_DATA_WIDTH_CH0_24) ?
186 V4L2_PIX_FMT_RGB24 : V4L2_PIX_FMT_BGR666;
189 pixel_fmt = (ldb->ldb_ctrl & LDB_DATA_WIDTH_CH1_24) ?
190 V4L2_PIX_FMT_RGB24 : V4L2_PIX_FMT_BGR666;
193 dev_err(ldb->dev, "unable to config di%d panel format\n",
195 pixel_fmt = V4L2_PIX_FMT_RGB24;
198 imx_drm_panel_format(encoder, pixel_fmt);
201 static void imx_ldb_encoder_commit(struct drm_encoder *encoder)
203 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
204 struct imx_ldb *ldb = imx_ldb_ch->ldb;
205 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
206 int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
209 clk_prepare_enable(ldb->clk[0]);
210 clk_prepare_enable(ldb->clk[1]);
213 if (imx_ldb_ch == &ldb->channel[0] || dual) {
214 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
215 if (mux == 0 || ldb->lvds_mux)
216 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0;
218 ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1;
220 if (imx_ldb_ch == &ldb->channel[1] || dual) {
221 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
222 if (mux == 1 || ldb->lvds_mux)
223 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1;
225 ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0;
229 const struct bus_mux *lvds_mux = NULL;
231 if (imx_ldb_ch == &ldb->channel[0])
232 lvds_mux = &ldb->lvds_mux[0];
233 else if (imx_ldb_ch == &ldb->channel[1])
234 lvds_mux = &ldb->lvds_mux[1];
236 regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask,
237 mux << lvds_mux->shift);
240 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
243 static void imx_ldb_encoder_mode_set(struct drm_encoder *encoder,
244 struct drm_display_mode *mode,
245 struct drm_display_mode *adjusted_mode)
247 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
248 struct imx_ldb *ldb = imx_ldb_ch->ldb;
249 int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
251 if (mode->clock > 170000) {
253 "%s: mode exceeds 170 MHz pixel clock\n", __func__);
255 if (mode->clock > 85000 && !dual) {
257 "%s: mode exceeds 85 MHz pixel clock\n", __func__);
260 /* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */
261 if (imx_ldb_ch == &ldb->channel[0]) {
262 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
263 ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW;
264 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
265 ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW;
267 if (imx_ldb_ch == &ldb->channel[1]) {
268 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
269 ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW;
270 else if (mode->flags & DRM_MODE_FLAG_PVSYNC)
271 ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW;
275 static void imx_ldb_encoder_disable(struct drm_encoder *encoder)
277 struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
278 struct imx_ldb *ldb = imx_ldb_ch->ldb;
281 * imx_ldb_encoder_disable is called by
282 * drm_helper_disable_unused_functions without
283 * the encoder being enabled before.
285 if (imx_ldb_ch == &ldb->channel[0] &&
286 (ldb->ldb_ctrl & LDB_CH0_MODE_EN_MASK) == 0)
288 else if (imx_ldb_ch == &ldb->channel[1] &&
289 (ldb->ldb_ctrl & LDB_CH1_MODE_EN_MASK) == 0)
292 if (imx_ldb_ch == &ldb->channel[0])
293 ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK;
294 else if (imx_ldb_ch == &ldb->channel[1])
295 ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK;
297 regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl);
299 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
300 clk_disable_unprepare(ldb->clk[0]);
301 clk_disable_unprepare(ldb->clk[1]);
305 static struct drm_connector_funcs imx_ldb_connector_funcs = {
306 .dpms = drm_helper_connector_dpms,
307 .fill_modes = drm_helper_probe_single_connector_modes,
308 .detect = imx_ldb_connector_detect,
309 .destroy = imx_drm_connector_destroy,
312 static struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = {
313 .get_modes = imx_ldb_connector_get_modes,
314 .best_encoder = imx_ldb_connector_best_encoder,
317 static struct drm_encoder_funcs imx_ldb_encoder_funcs = {
318 .destroy = imx_drm_encoder_destroy,
321 static struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = {
322 .dpms = imx_ldb_encoder_dpms,
323 .mode_fixup = imx_ldb_encoder_mode_fixup,
324 .prepare = imx_ldb_encoder_prepare,
325 .commit = imx_ldb_encoder_commit,
326 .mode_set = imx_ldb_encoder_mode_set,
327 .disable = imx_ldb_encoder_disable,
330 static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno)
334 snprintf(clkname, sizeof(clkname), "di%d", chno);
335 ldb->clk[chno] = devm_clk_get(ldb->dev, clkname);
336 if (IS_ERR(ldb->clk[chno]))
337 return PTR_ERR(ldb->clk[chno]);
339 snprintf(clkname, sizeof(clkname), "di%d_pll", chno);
340 ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname);
342 return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]);
345 static int imx_ldb_register(struct drm_device *drm,
346 struct imx_ldb_channel *imx_ldb_ch)
348 struct imx_ldb *ldb = imx_ldb_ch->ldb;
351 ret = imx_drm_encoder_parse_of(drm, &imx_ldb_ch->encoder,
356 ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno);
360 if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) {
361 ret = imx_ldb_get_clk(ldb, 1);
366 drm_encoder_helper_add(&imx_ldb_ch->encoder,
367 &imx_ldb_encoder_helper_funcs);
368 drm_encoder_init(drm, &imx_ldb_ch->encoder, &imx_ldb_encoder_funcs,
369 DRM_MODE_ENCODER_LVDS);
371 drm_connector_helper_add(&imx_ldb_ch->connector,
372 &imx_ldb_connector_helper_funcs);
373 drm_connector_init(drm, &imx_ldb_ch->connector,
374 &imx_ldb_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
376 drm_mode_connector_attach_encoder(&imx_ldb_ch->connector,
377 &imx_ldb_ch->encoder);
387 static const char * const imx_ldb_bit_mappings[] = {
388 [LVDS_BIT_MAP_SPWG] = "spwg",
389 [LVDS_BIT_MAP_JEIDA] = "jeida",
392 static const int of_get_data_mapping(struct device_node *np)
397 ret = of_property_read_string(np, "fsl,data-mapping", &bm);
401 for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++)
402 if (!strcasecmp(bm, imx_ldb_bit_mappings[i]))
408 static struct bus_mux imx6q_lvds_mux[2] = {
412 .mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK,
416 .mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK,
421 * For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb",
422 * of_match_device will walk through this list and take the first entry
423 * matching any of its compatible values. Therefore, the more generic
424 * entries (in this case fsl,imx53-ldb) need to be ordered last.
426 static const struct of_device_id imx_ldb_dt_ids[] = {
427 { .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, },
428 { .compatible = "fsl,imx53-ldb", .data = NULL, },
431 MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids);
433 static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
435 struct drm_device *drm = data;
436 struct device_node *np = dev->of_node;
437 const struct of_device_id *of_id =
438 of_match_device(imx_ldb_dt_ids, dev);
439 struct device_node *child;
441 struct imx_ldb *imx_ldb;
448 imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL);
452 imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
453 if (IS_ERR(imx_ldb->regmap)) {
454 dev_err(dev, "failed to get parent regmap\n");
455 return PTR_ERR(imx_ldb->regmap);
461 imx_ldb->lvds_mux = of_id->data;
463 dual = of_property_read_bool(np, "fsl,dual-channel");
465 imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN;
468 * There are three different possible clock mux configurations:
469 * i.MX53: ipu1_di0_sel, ipu1_di1_sel
470 * i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel
471 * i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel
472 * Map them all to di0_sel...di3_sel.
474 for (i = 0; i < 4; i++) {
477 sprintf(clkname, "di%d_sel", i);
478 imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname);
479 if (IS_ERR(imx_ldb->clk_sel[i])) {
480 ret = PTR_ERR(imx_ldb->clk_sel[i]);
481 imx_ldb->clk_sel[i] = NULL;
488 for_each_child_of_node(np, child) {
489 struct imx_ldb_channel *channel;
491 ret = of_property_read_u32(child, "reg", &i);
492 if (ret || i < 0 || i > 1)
496 dev_warn(dev, "dual-channel mode, ignoring second output\n");
500 if (!of_device_is_available(child))
503 channel = &imx_ldb->channel[i];
504 channel->ldb = imx_ldb;
506 channel->child = child;
508 edidp = of_get_property(child, "edid", &channel->edid_len);
510 channel->edid = kmemdup(edidp, channel->edid_len,
513 ret = of_get_drm_display_mode(child, &channel->mode, 0);
515 channel->mode_valid = 1;
518 ret = of_property_read_u32(child, "fsl,data-width", &datawidth);
521 else if (datawidth != 18 && datawidth != 24)
524 mapping = of_get_data_mapping(child);
526 case LVDS_BIT_MAP_SPWG:
527 if (datawidth == 24) {
530 LDB_DATA_WIDTH_CH0_24;
533 LDB_DATA_WIDTH_CH1_24;
536 case LVDS_BIT_MAP_JEIDA:
537 if (datawidth == 18) {
538 dev_err(dev, "JEIDA standard only supported in 24 bit\n");
542 imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
543 LDB_BIT_MAP_CH0_JEIDA;
545 imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
546 LDB_BIT_MAP_CH1_JEIDA;
549 dev_err(dev, "data mapping not specified or invalid\n");
553 ret = imx_ldb_register(drm, channel);
558 dev_set_drvdata(dev, imx_ldb);
563 static void imx_ldb_unbind(struct device *dev, struct device *master,
566 struct imx_ldb *imx_ldb = dev_get_drvdata(dev);
569 for (i = 0; i < 2; i++) {
570 struct imx_ldb_channel *channel = &imx_ldb->channel[i];
572 if (!channel->connector.funcs)
575 channel->connector.funcs->destroy(&channel->connector);
576 channel->encoder.funcs->destroy(&channel->encoder);
578 kfree(channel->edid);
582 static const struct component_ops imx_ldb_ops = {
583 .bind = imx_ldb_bind,
584 .unbind = imx_ldb_unbind,
587 static int imx_ldb_probe(struct platform_device *pdev)
589 return component_add(&pdev->dev, &imx_ldb_ops);
592 static int imx_ldb_remove(struct platform_device *pdev)
594 component_del(&pdev->dev, &imx_ldb_ops);
598 static struct platform_driver imx_ldb_driver = {
599 .probe = imx_ldb_probe,
600 .remove = imx_ldb_remove,
602 .of_match_table = imx_ldb_dt_ids,
607 module_platform_driver(imx_ldb_driver);
609 MODULE_DESCRIPTION("i.MX LVDS driver");
610 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
611 MODULE_LICENSE("GPL");
612 MODULE_ALIAS("platform:" DRIVER_NAME);