dpi.c 10.3 KB
Newer Older
T
Tomi Valkeinen 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/*
 * linux/drivers/video/omap2/dss/dpi.c
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * Some code and ideas taken from drivers/video/omap/ driver
 * by Imre Deak.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define DSS_SUBSYS_NAME "DPI"

#include <linux/kernel.h>
#include <linux/delay.h>
27
#include <linux/export.h>
28
#include <linux/err.h>
T
Tomi Valkeinen 已提交
29
#include <linux/errno.h>
30 31
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
T
Tomi Valkeinen 已提交
32

33
#include <video/omapdss.h>
T
Tomi Valkeinen 已提交
34 35

#include "dss.h"
36
#include "dss_features.h"
T
Tomi Valkeinen 已提交
37 38

static struct {
39
	struct regulator *vdds_dsi_reg;
40
	struct platform_device *dsidev;
41

42 43
	struct mutex lock;

44
	struct omap_video_timings timings;
45
	struct dss_lcd_mgr_config mgr_config;
46
	int data_lines;
47 48

	struct omap_dss_output output;
T
Tomi Valkeinen 已提交
49 50
} dpi;

51 52 53 54 55 56 57 58 59
static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
{
	int dsi_module;

	dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;

	return dsi_get_dsidev_from_id(dsi_module);
}

60 61 62 63
static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
{
	if (dssdev->clocks.dispc.dispc_fclk_src ==
			OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
64 65
			dssdev->clocks.dispc.dispc_fclk_src ==
			OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
66
			dssdev->clocks.dispc.channel.lcd_clk_src ==
67 68 69
			OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
			dssdev->clocks.dispc.channel.lcd_clk_src ==
			OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
70 71 72 73 74
		return true;
	else
		return false;
}

75
static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
76 77
		unsigned long pck_req, unsigned long *fck, int *lck_div,
		int *pck_div)
T
Tomi Valkeinen 已提交
78 79 80 81 82
{
	struct dsi_clock_info dsi_cinfo;
	struct dispc_clock_info dispc_cinfo;
	int r;

83 84
	r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
			&dispc_cinfo);
T
Tomi Valkeinen 已提交
85 86 87
	if (r)
		return r;

88
	r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
T
Tomi Valkeinen 已提交
89 90 91
	if (r)
		return r;

92
	dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
T
Tomi Valkeinen 已提交
93

94
	dpi.mgr_config.clock_info = dispc_cinfo;
T
Tomi Valkeinen 已提交
95

96
	*fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
T
Tomi Valkeinen 已提交
97 98 99 100 101
	*lck_div = dispc_cinfo.lck_div;
	*pck_div = dispc_cinfo.pck_div;

	return 0;
}
102

103
static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
104 105
		unsigned long pck_req, unsigned long *fck, int *lck_div,
		int *pck_div)
T
Tomi Valkeinen 已提交
106 107 108 109 110
{
	struct dss_clock_info dss_cinfo;
	struct dispc_clock_info dispc_cinfo;
	int r;

111
	r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
T
Tomi Valkeinen 已提交
112 113 114 115 116 117 118
	if (r)
		return r;

	r = dss_set_clock_div(&dss_cinfo);
	if (r)
		return r;

119
	dpi.mgr_config.clock_info = dispc_cinfo;
T
Tomi Valkeinen 已提交
120 121 122 123 124 125 126 127 128 129

	*fck = dss_cinfo.fck;
	*lck_div = dispc_cinfo.lck_div;
	*pck_div = dispc_cinfo.pck_div;

	return 0;
}

static int dpi_set_mode(struct omap_dss_device *dssdev)
{
130
	struct omap_video_timings *t = &dpi.timings;
131 132
	int lck_div = 0, pck_div = 0;
	unsigned long fck = 0;
T
Tomi Valkeinen 已提交
133 134 135
	unsigned long pck;
	int r = 0;

136
	if (dpi_use_dsi_pll(dssdev))
137 138
		r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
				&lck_div, &pck_div);
139
	else
140 141
		r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
				&lck_div, &pck_div);
T
Tomi Valkeinen 已提交
142
	if (r)
143
		return r;
T
Tomi Valkeinen 已提交
144 145 146 147 148 149 150 151 152 153 154

	pck = fck / lck_div / pck_div / 1000;

	if (pck != t->pixel_clock) {
		DSSWARN("Could not find exact pixel clock. "
				"Requested %d kHz, got %lu kHz\n",
				t->pixel_clock, pck);

		t->pixel_clock = pck;
	}

155
	dss_mgr_set_timings(dssdev->manager, t);
T
Tomi Valkeinen 已提交
156

157
	return 0;
T
Tomi Valkeinen 已提交
158 159
}

160
static void dpi_config_lcd_manager(struct omap_dss_device *dssdev)
T
Tomi Valkeinen 已提交
161
{
162
	dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
163

164 165 166
	dpi.mgr_config.stallmode = false;
	dpi.mgr_config.fifohandcheck = false;

167
	dpi.mgr_config.video_port_width = dpi.data_lines;
168 169 170

	dpi.mgr_config.lcden_sig_polarity = 0;

171
	dss_mgr_set_lcd_config(dssdev->manager, &dpi.mgr_config);
T
Tomi Valkeinen 已提交
172 173
}

174
int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
T
Tomi Valkeinen 已提交
175 176 177
{
	int r;

178 179
	mutex_lock(&dpi.lock);

180
	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
181
		DSSERR("no VDSS_DSI regulator\n");
182 183
		r = -ENODEV;
		goto err_no_reg;
184 185
	}

186 187
	if (dssdev->manager == NULL) {
		DSSERR("failed to enable display: no manager\n");
188 189
		r = -ENODEV;
		goto err_no_mgr;
190 191
	}

T
Tomi Valkeinen 已提交
192 193 194
	r = omap_dss_start_device(dssdev);
	if (r) {
		DSSERR("failed to start device\n");
195
		goto err_start_dev;
T
Tomi Valkeinen 已提交
196 197
	}

198
	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
199 200
		r = regulator_enable(dpi.vdds_dsi_reg);
		if (r)
201
			goto err_reg_enable;
202 203
	}

204
	r = dispc_runtime_get();
T
Tomi Valkeinen 已提交
205
	if (r)
206 207
		goto err_get_dispc;

208 209 210 211
	r = dss_dpi_select_source(dssdev->channel);
	if (r)
		goto err_src_sel;

212
	if (dpi_use_dsi_pll(dssdev)) {
213 214 215 216
		r = dsi_runtime_get(dpi.dsidev);
		if (r)
			goto err_get_dsi;

217
		r = dsi_pll_init(dpi.dsidev, 0, 1);
218
		if (r)
219
			goto err_dsi_pll_init;
220 221
	}

T
Tomi Valkeinen 已提交
222 223
	r = dpi_set_mode(dssdev);
	if (r)
224
		goto err_set_mode;
T
Tomi Valkeinen 已提交
225

226 227
	dpi_config_lcd_manager(dssdev);

T
Tomi Valkeinen 已提交
228 229
	mdelay(2);

230 231 232
	r = dss_mgr_enable(dssdev->manager);
	if (r)
		goto err_mgr_enable;
T
Tomi Valkeinen 已提交
233

234 235
	mutex_unlock(&dpi.lock);

T
Tomi Valkeinen 已提交
236 237
	return 0;

238
err_mgr_enable:
239
err_set_mode:
240
	if (dpi_use_dsi_pll(dssdev))
241
		dsi_pll_uninit(dpi.dsidev, true);
242 243 244 245
err_dsi_pll_init:
	if (dpi_use_dsi_pll(dssdev))
		dsi_runtime_put(dpi.dsidev);
err_get_dsi:
246
err_src_sel:
247 248
	dispc_runtime_put();
err_get_dispc:
249
	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
250
		regulator_disable(dpi.vdds_dsi_reg);
251
err_reg_enable:
T
Tomi Valkeinen 已提交
252
	omap_dss_stop_device(dssdev);
253
err_start_dev:
254 255 256
err_no_mgr:
err_no_reg:
	mutex_unlock(&dpi.lock);
T
Tomi Valkeinen 已提交
257 258
	return r;
}
259
EXPORT_SYMBOL(omapdss_dpi_display_enable);
T
Tomi Valkeinen 已提交
260

261
void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
T
Tomi Valkeinen 已提交
262
{
263 264
	mutex_lock(&dpi.lock);

265
	dss_mgr_disable(dssdev->manager);
T
Tomi Valkeinen 已提交
266

267 268
	if (dpi_use_dsi_pll(dssdev)) {
		dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
269
		dsi_pll_uninit(dpi.dsidev, true);
270
		dsi_runtime_put(dpi.dsidev);
271
	}
T
Tomi Valkeinen 已提交
272

273
	dispc_runtime_put();
T
Tomi Valkeinen 已提交
274

275
	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
276 277
		regulator_disable(dpi.vdds_dsi_reg);

T
Tomi Valkeinen 已提交
278
	omap_dss_stop_device(dssdev);
279 280

	mutex_unlock(&dpi.lock);
T
Tomi Valkeinen 已提交
281
}
282
EXPORT_SYMBOL(omapdss_dpi_display_disable);
T
Tomi Valkeinen 已提交
283

284 285
void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
T
Tomi Valkeinen 已提交
286 287
{
	DSSDBG("dpi_set_timings\n");
288 289 290

	mutex_lock(&dpi.lock);

291 292
	dpi.timings = *timings;

293
	mutex_unlock(&dpi.lock);
T
Tomi Valkeinen 已提交
294
}
295
EXPORT_SYMBOL(omapdss_dpi_set_timings);
T
Tomi Valkeinen 已提交
296

297
int dpi_check_timings(struct omap_dss_device *dssdev,
T
Tomi Valkeinen 已提交
298 299 300 301 302 303
			struct omap_video_timings *timings)
{
	int r;
	int lck_div, pck_div;
	unsigned long fck;
	unsigned long pck;
304
	struct dispc_clock_info dispc_cinfo;
T
Tomi Valkeinen 已提交
305

306
	if (dss_mgr_check_timings(dssdev->manager, timings))
T
Tomi Valkeinen 已提交
307 308 309 310 311
		return -EINVAL;

	if (timings->pixel_clock == 0)
		return -EINVAL;

312
	if (dpi_use_dsi_pll(dssdev)) {
T
Tomi Valkeinen 已提交
313
		struct dsi_clock_info dsi_cinfo;
314
		r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
T
Tomi Valkeinen 已提交
315 316 317 318 319 320
				timings->pixel_clock * 1000,
				&dsi_cinfo, &dispc_cinfo);

		if (r)
			return r;

321
		fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
322
	} else {
T
Tomi Valkeinen 已提交
323
		struct dss_clock_info dss_cinfo;
324
		r = dss_calc_clock_div(timings->pixel_clock * 1000,
T
Tomi Valkeinen 已提交
325 326 327 328 329 330 331
				&dss_cinfo, &dispc_cinfo);

		if (r)
			return r;

		fck = dss_cinfo.fck;
	}
332 333 334

	lck_div = dispc_cinfo.lck_div;
	pck_div = dispc_cinfo.pck_div;
T
Tomi Valkeinen 已提交
335 336 337 338 339 340 341

	pck = fck / lck_div / pck_div / 1000;

	timings->pixel_clock = pck;

	return 0;
}
342
EXPORT_SYMBOL(dpi_check_timings);
T
Tomi Valkeinen 已提交
343

344 345 346 347 348 349 350 351 352 353
void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
{
	mutex_lock(&dpi.lock);

	dpi.data_lines = data_lines;

	mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(omapdss_dpi_set_data_lines);

354
static int __init dpi_init_display(struct omap_dss_device *dssdev)
T
Tomi Valkeinen 已提交
355 356 357
{
	DSSDBG("init_display\n");

358 359
	if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) &&
					dpi.vdds_dsi_reg == NULL) {
360
		struct regulator *vdds_dsi;
T
Tomi Valkeinen 已提交
361

362 363 364
		vdds_dsi = dss_get_vdds_dsi();

		if (IS_ERR(vdds_dsi)) {
365
			DSSERR("can't get VDDS_DSI regulator\n");
366
			return PTR_ERR(vdds_dsi);
367
		}
368 369

		dpi.vdds_dsi_reg = vdds_dsi;
370 371
	}

372 373 374 375 376 377
	if (dpi_use_dsi_pll(dssdev)) {
		enum omap_dss_clk_source dispc_fclk_src =
			dssdev->clocks.dispc.dispc_fclk_src;
		dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
	}

T
Tomi Valkeinen 已提交
378 379 380
	return 0;
}

381
static struct omap_dss_device * __init dpi_find_dssdev(struct platform_device *pdev)
382
{
383
	struct omap_dss_board_info *pdata = pdev->dev.platform_data;
384 385 386 387 388
	const char *def_disp_name = dss_get_default_display_name();
	struct omap_dss_device *def_dssdev;
	int i;

	def_dssdev = NULL;
389 390 391 392 393 394 395

	for (i = 0; i < pdata->num_devices; ++i) {
		struct omap_dss_device *dssdev = pdata->devices[i];

		if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
			continue;

396 397 398 399 400 401 402
		if (def_dssdev == NULL)
			def_dssdev = dssdev;

		if (def_disp_name != NULL &&
				strcmp(dssdev->name, def_disp_name) == 0) {
			def_dssdev = dssdev;
			break;
403
		}
404
	}
405

406 407 408
	return def_dssdev;
}

409
static void __init dpi_probe_pdata(struct platform_device *dpidev)
410
{
411
	struct omap_dss_device *plat_dssdev;
412 413 414
	struct omap_dss_device *dssdev;
	int r;

415
	plat_dssdev = dpi_find_dssdev(dpidev);
416

417 418 419 420
	if (!plat_dssdev)
		return;

	dssdev = dss_alloc_and_init_device(&dpidev->dev);
421 422 423
	if (!dssdev)
		return;

424 425
	dss_copy_device_pdata(dssdev, plat_dssdev);

426 427 428
	r = dpi_init_display(dssdev);
	if (r) {
		DSSERR("device %s init failed: %d\n", dssdev->name, r);
429
		dss_put_device(dssdev);
430 431 432
		return;
	}

433
	r = dss_add_device(dssdev);
434 435
	if (r) {
		DSSERR("device %s register failed: %d\n", dssdev->name, r);
436
		dss_put_device(dssdev);
437
		return;
438
	}
439 440
}

441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458
static void __init dpi_init_output(struct platform_device *pdev)
{
	struct omap_dss_output *out = &dpi.output;

	out->pdev = pdev;
	out->id = OMAP_DSS_OUTPUT_DPI;
	out->type = OMAP_DISPLAY_TYPE_DPI;

	dss_register_output(out);
}

static void __exit dpi_uninit_output(struct platform_device *pdev)
{
	struct omap_dss_output *out = &dpi.output;

	dss_unregister_output(out);
}

459 460
static int __init omap_dpi_probe(struct platform_device *pdev)
{
461 462
	mutex_init(&dpi.lock);

463 464
	dpi_init_output(pdev);

465
	dpi_probe_pdata(pdev);
466

467 468 469
	return 0;
}

T
Tomi Valkeinen 已提交
470
static int __exit omap_dpi_remove(struct platform_device *pdev)
T
Tomi Valkeinen 已提交
471
{
472
	dss_unregister_child_devices(&pdev->dev);
473

474 475
	dpi_uninit_output(pdev);

476
	return 0;
T
Tomi Valkeinen 已提交
477 478
}

479
static struct platform_driver omap_dpi_driver = {
T
Tomi Valkeinen 已提交
480
	.remove         = __exit_p(omap_dpi_remove),
481 482 483 484 485 486
	.driver         = {
		.name   = "omapdss_dpi",
		.owner  = THIS_MODULE,
	},
};

T
Tomi Valkeinen 已提交
487
int __init dpi_init_platform_driver(void)
488
{
489
	return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
490 491
}

T
Tomi Valkeinen 已提交
492
void __exit dpi_uninit_platform_driver(void)
493 494 495
{
	platform_driver_unregister(&omap_dpi_driver);
}