dpi.c 8.84 KB
Newer Older
Tomi Valkeinen's avatar
Tomi Valkeinen committed
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>
Tomi Valkeinen's avatar
Tomi Valkeinen committed
29
#include <linux/errno.h>
30
31
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
Tomi Valkeinen's avatar
Tomi Valkeinen committed
32

33
#include <video/omapdss.h>
Tomi Valkeinen's avatar
Tomi Valkeinen committed
34
35
36
37
38
#include <plat/cpu.h>

#include "dss.h"

static struct {
39
	struct regulator *vdds_dsi_reg;
40
	struct platform_device *dsidev;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
41
42
} dpi;

43
44
45
46
47
48
49
50
51
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);
}

52
53
54
55
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 ||
56
57
			dssdev->clocks.dispc.dispc_fclk_src ==
			OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
58
			dssdev->clocks.dispc.channel.lcd_clk_src ==
59
60
61
			OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
			dssdev->clocks.dispc.channel.lcd_clk_src ==
			OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
62
63
64
65
66
		return true;
	else
		return false;
}

67
static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
68
69
		unsigned long pck_req, unsigned long *fck, int *lck_div,
		int *pck_div)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
70
71
72
73
74
{
	struct dsi_clock_info dsi_cinfo;
	struct dispc_clock_info dispc_cinfo;
	int r;

75
76
	r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
			&dispc_cinfo);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
77
78
79
	if (r)
		return r;

80
	r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
81
82
83
	if (r)
		return r;

84
	dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
85

86
	r = dispc_mgr_set_clock_div(dssdev->manager->id, &dispc_cinfo);
87
88
	if (r) {
		dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
89
		return r;
90
	}
Tomi Valkeinen's avatar
Tomi Valkeinen committed
91

92
	*fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
93
94
95
96
97
	*lck_div = dispc_cinfo.lck_div;
	*pck_div = dispc_cinfo.pck_div;

	return 0;
}
98

99
static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
100
101
		unsigned long pck_req, unsigned long *fck, int *lck_div,
		int *pck_div)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
102
103
104
105
106
{
	struct dss_clock_info dss_cinfo;
	struct dispc_clock_info dispc_cinfo;
	int r;

107
	r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
108
109
110
111
112
113
114
	if (r)
		return r;

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

115
	r = dispc_mgr_set_clock_div(dssdev->manager->id, &dispc_cinfo);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
116
117
118
119
120
121
122
123
124
125
126
127
128
	if (r)
		return r;

	*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)
{
	struct omap_video_timings *t = &dssdev->panel.timings;
129
130
	int lck_div = 0, pck_div = 0;
	unsigned long fck = 0;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
131
132
133
	unsigned long pck;
	int r = 0;

134
	dispc_mgr_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
135
			dssdev->panel.acbi, dssdev->panel.acb);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
136

137
	if (dpi_use_dsi_pll(dssdev))
138
139
		r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
				&lck_div, &pck_div);
140
	else
141
142
		r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
				&lck_div, &pck_div);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
143
	if (r)
144
		return r;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
145
146
147
148
149
150
151
152
153
154
155

	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;
	}

156
	dss_mgr_set_timings(dssdev->manager, t);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
157

158
	return 0;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
159
160
}

161
static void dpi_basic_init(struct omap_dss_device *dssdev)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
162
{
163
164
165
	dispc_mgr_set_io_pad_mode(DSS_IO_PAD_MODE_BYPASS);
	dispc_mgr_enable_stallmode(dssdev->manager->id, false);

166
167
	dispc_mgr_set_lcd_type_tft(dssdev->manager->id);

168
	dispc_mgr_set_tft_data_lines(dssdev->manager->id,
169
			dssdev->phy.dpi.data_lines);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
170
171
}

172
int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
173
174
175
{
	int r;

176
177
178
179
180
	if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
		DSSERR("no VDSS_DSI regulator\n");
		return -ENODEV;
	}

181
182
183
184
185
	if (dssdev->manager == NULL) {
		DSSERR("failed to enable display: no manager\n");
		return -ENODEV;
	}

Tomi Valkeinen's avatar
Tomi Valkeinen committed
186
187
188
	r = omap_dss_start_device(dssdev);
	if (r) {
		DSSERR("failed to start device\n");
189
		goto err_start_dev;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
190
191
	}

192
193
194
	if (cpu_is_omap34xx()) {
		r = regulator_enable(dpi.vdds_dsi_reg);
		if (r)
195
			goto err_reg_enable;
196
197
	}

198
	r = dispc_runtime_get();
Tomi Valkeinen's avatar
Tomi Valkeinen committed
199
	if (r)
200
201
202
		goto err_get_dispc;

	dpi_basic_init(dssdev);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
203

204
	if (dpi_use_dsi_pll(dssdev)) {
205
206
207
208
		r = dsi_runtime_get(dpi.dsidev);
		if (r)
			goto err_get_dsi;

209
		r = dsi_pll_init(dpi.dsidev, 0, 1);
210
		if (r)
211
			goto err_dsi_pll_init;
212
213
	}

Tomi Valkeinen's avatar
Tomi Valkeinen committed
214
215
	r = dpi_set_mode(dssdev);
	if (r)
216
		goto err_set_mode;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
217
218
219

	mdelay(2);

220
221
222
	r = dss_mgr_enable(dssdev->manager);
	if (r)
		goto err_mgr_enable;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
223
224
225

	return 0;

226
err_mgr_enable:
227
err_set_mode:
228
	if (dpi_use_dsi_pll(dssdev))
229
		dsi_pll_uninit(dpi.dsidev, true);
230
231
232
233
234
235
err_dsi_pll_init:
	if (dpi_use_dsi_pll(dssdev))
		dsi_runtime_put(dpi.dsidev);
err_get_dsi:
	dispc_runtime_put();
err_get_dispc:
236
237
	if (cpu_is_omap34xx())
		regulator_disable(dpi.vdds_dsi_reg);
238
err_reg_enable:
Tomi Valkeinen's avatar
Tomi Valkeinen committed
239
	omap_dss_stop_device(dssdev);
240
err_start_dev:
Tomi Valkeinen's avatar
Tomi Valkeinen committed
241
242
	return r;
}
243
EXPORT_SYMBOL(omapdss_dpi_display_enable);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
244

245
void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
246
{
247
	dss_mgr_disable(dssdev->manager);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
248

249
250
	if (dpi_use_dsi_pll(dssdev)) {
		dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
251
		dsi_pll_uninit(dpi.dsidev, true);
252
		dsi_runtime_put(dpi.dsidev);
253
	}
Tomi Valkeinen's avatar
Tomi Valkeinen committed
254

255
	dispc_runtime_put();
Tomi Valkeinen's avatar
Tomi Valkeinen committed
256

257
258
259
	if (cpu_is_omap34xx())
		regulator_disable(dpi.vdds_dsi_reg);

Tomi Valkeinen's avatar
Tomi Valkeinen committed
260
261
	omap_dss_stop_device(dssdev);
}
262
EXPORT_SYMBOL(omapdss_dpi_display_disable);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
263

264
void dpi_set_timings(struct omap_dss_device *dssdev,
Tomi Valkeinen's avatar
Tomi Valkeinen committed
265
266
			struct omap_video_timings *timings)
{
267
268
	int r;

Tomi Valkeinen's avatar
Tomi Valkeinen committed
269
270
271
	DSSDBG("dpi_set_timings\n");
	dssdev->panel.timings = *timings;
	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
272
		r = dispc_runtime_get();
273
		if (r)
274
275
			return;

Tomi Valkeinen's avatar
Tomi Valkeinen committed
276
		dpi_set_mode(dssdev);
277
278

		dispc_runtime_put();
279
280
	} else {
		dss_mgr_set_timings(dssdev->manager, timings);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
281
282
	}
}
283
EXPORT_SYMBOL(dpi_set_timings);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
284

285
int dpi_check_timings(struct omap_dss_device *dssdev,
Tomi Valkeinen's avatar
Tomi Valkeinen committed
286
287
288
289
290
291
			struct omap_video_timings *timings)
{
	int r;
	int lck_div, pck_div;
	unsigned long fck;
	unsigned long pck;
292
	struct dispc_clock_info dispc_cinfo;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
293

294
	if (dss_mgr_check_timings(dssdev->manager, timings))
Tomi Valkeinen's avatar
Tomi Valkeinen committed
295
296
297
298
299
		return -EINVAL;

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

300
	if (dpi_use_dsi_pll(dssdev)) {
Tomi Valkeinen's avatar
Tomi Valkeinen committed
301
		struct dsi_clock_info dsi_cinfo;
302
		r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
Tomi Valkeinen's avatar
Tomi Valkeinen committed
303
304
305
306
307
308
				timings->pixel_clock * 1000,
				&dsi_cinfo, &dispc_cinfo);

		if (r)
			return r;

309
		fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
310
	} else {
Tomi Valkeinen's avatar
Tomi Valkeinen committed
311
		struct dss_clock_info dss_cinfo;
312
		r = dss_calc_clock_div(timings->pixel_clock * 1000,
Tomi Valkeinen's avatar
Tomi Valkeinen committed
313
314
315
316
317
318
319
				&dss_cinfo, &dispc_cinfo);

		if (r)
			return r;

		fck = dss_cinfo.fck;
	}
320
321
322

	lck_div = dispc_cinfo.lck_div;
	pck_div = dispc_cinfo.pck_div;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
323
324
325
326
327
328
329

	pck = fck / lck_div / pck_div / 1000;

	timings->pixel_clock = pck;

	return 0;
}
330
EXPORT_SYMBOL(dpi_check_timings);
Tomi Valkeinen's avatar
Tomi Valkeinen committed
331

332
static int __init dpi_init_display(struct omap_dss_device *dssdev)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
333
334
335
{
	DSSDBG("init_display\n");

336
337
	if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
		struct regulator *vdds_dsi;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
338

339
340
341
		vdds_dsi = dss_get_vdds_dsi();

		if (IS_ERR(vdds_dsi)) {
342
			DSSERR("can't get VDDS_DSI regulator\n");
343
			return PTR_ERR(vdds_dsi);
344
		}
345
346

		dpi.vdds_dsi_reg = vdds_dsi;
347
348
	}

349
350
351
352
353
354
	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);
	}

Tomi Valkeinen's avatar
Tomi Valkeinen committed
355
356
357
	return 0;
}

358
static void __init dpi_probe_pdata(struct platform_device *pdev)
359
{
360
361
362
363
364
365
366
367
368
	struct omap_dss_board_info *pdata = pdev->dev.platform_data;
	int i, r;

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

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

369
370
371
372
373
374
		r = dpi_init_display(dssdev);
		if (r) {
			DSSERR("device %s init failed: %d\n", dssdev->name, r);
			continue;
		}

375
376
377
378
379
		r = omap_dss_register_device(dssdev, &pdev->dev, i);
		if (r)
			DSSERR("device %s register failed: %d\n",
					dssdev->name, r);
	}
380
381
382
383
384
}

static int __init omap_dpi_probe(struct platform_device *pdev)
{
	dpi_probe_pdata(pdev);
385

386
387
388
	return 0;
}

Tomi Valkeinen's avatar
Tomi Valkeinen committed
389
static int __exit omap_dpi_remove(struct platform_device *pdev)
Tomi Valkeinen's avatar
Tomi Valkeinen committed
390
{
391
392
	omap_dss_unregister_child_devices(&pdev->dev);

393
	return 0;
Tomi Valkeinen's avatar
Tomi Valkeinen committed
394
395
}

396
static struct platform_driver omap_dpi_driver = {
Tomi Valkeinen's avatar
Tomi Valkeinen committed
397
	.remove         = __exit_p(omap_dpi_remove),
398
399
400
401
402
403
	.driver         = {
		.name   = "omapdss_dpi",
		.owner  = THIS_MODULE,
	},
};

Tomi Valkeinen's avatar
Tomi Valkeinen committed
404
int __init dpi_init_platform_driver(void)
405
{
406
	return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
407
408
}

Tomi Valkeinen's avatar
Tomi Valkeinen committed
409
void __exit dpi_uninit_platform_driver(void)
410
411
412
{
	platform_driver_unregister(&omap_dpi_driver);
}