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23#define DSS_SUBSYS_NAME "DPI"
24
25#include <linux/kernel.h>
26#include <linux/delay.h>
27#include <linux/export.h>
28#include <linux/err.h>
29#include <linux/errno.h>
30#include <linux/platform_device.h>
31#include <linux/regulator/consumer.h>
32#include <linux/string.h>
33#include <linux/of.h>
34#include <linux/clk.h>
35
36#include "omapdss.h"
37#include "dss.h"
38#include "dss_features.h"
39
40struct dpi_data {
41 struct platform_device *pdev;
42
43 struct regulator *vdds_dsi_reg;
44 enum dss_clk_source clk_src;
45 struct dss_pll *pll;
46
47 struct mutex lock;
48
49 struct videomode vm;
50 struct dss_lcd_mgr_config mgr_config;
51 int data_lines;
52
53 struct omap_dss_device output;
54
55 bool port_initialized;
56};
57
58static struct dpi_data *dpi_get_data_from_dssdev(struct omap_dss_device *dssdev)
59{
60 return container_of(dssdev, struct dpi_data, output);
61}
62
63static enum dss_clk_source dpi_get_clk_src_dra7xx(enum omap_channel channel)
64{
65
66
67
68
69
70
71
72 switch (channel) {
73 case OMAP_DSS_CHANNEL_LCD:
74 {
75 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL1_1))
76 return DSS_CLK_SRC_PLL1_1;
77 break;
78 }
79 case OMAP_DSS_CHANNEL_LCD2:
80 {
81 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL1_3))
82 return DSS_CLK_SRC_PLL1_3;
83 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL2_3))
84 return DSS_CLK_SRC_PLL2_3;
85 break;
86 }
87 case OMAP_DSS_CHANNEL_LCD3:
88 {
89 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL2_1))
90 return DSS_CLK_SRC_PLL2_1;
91 if (dss_pll_find_by_src(DSS_CLK_SRC_PLL1_3))
92 return DSS_CLK_SRC_PLL1_3;
93 break;
94 }
95 default:
96 break;
97 }
98
99 return DSS_CLK_SRC_FCK;
100}
101
102static enum dss_clk_source dpi_get_clk_src(enum omap_channel channel)
103{
104
105
106
107
108
109 switch (omapdss_get_version()) {
110 case OMAPDSS_VER_OMAP24xx:
111 case OMAPDSS_VER_OMAP34xx_ES1:
112 case OMAPDSS_VER_OMAP34xx_ES3:
113 case OMAPDSS_VER_OMAP3630:
114 case OMAPDSS_VER_AM35xx:
115 case OMAPDSS_VER_AM43xx:
116 return DSS_CLK_SRC_FCK;
117
118 case OMAPDSS_VER_OMAP4430_ES1:
119 case OMAPDSS_VER_OMAP4430_ES2:
120 case OMAPDSS_VER_OMAP4:
121 switch (channel) {
122 case OMAP_DSS_CHANNEL_LCD:
123 return DSS_CLK_SRC_PLL1_1;
124 case OMAP_DSS_CHANNEL_LCD2:
125 return DSS_CLK_SRC_PLL2_1;
126 default:
127 return DSS_CLK_SRC_FCK;
128 }
129
130 case OMAPDSS_VER_OMAP5:
131 switch (channel) {
132 case OMAP_DSS_CHANNEL_LCD:
133 return DSS_CLK_SRC_PLL1_1;
134 case OMAP_DSS_CHANNEL_LCD3:
135 return DSS_CLK_SRC_PLL2_1;
136 case OMAP_DSS_CHANNEL_LCD2:
137 default:
138 return DSS_CLK_SRC_FCK;
139 }
140
141 case OMAPDSS_VER_DRA7xx:
142 return dpi_get_clk_src_dra7xx(channel);
143
144 default:
145 return DSS_CLK_SRC_FCK;
146 }
147}
148
149struct dpi_clk_calc_ctx {
150 struct dss_pll *pll;
151 unsigned clkout_idx;
152
153
154
155 unsigned long pck_min, pck_max;
156
157
158
159 struct dss_pll_clock_info pll_cinfo;
160 unsigned long fck;
161 struct dispc_clock_info dispc_cinfo;
162};
163
164static bool dpi_calc_dispc_cb(int lckd, int pckd, unsigned long lck,
165 unsigned long pck, void *data)
166{
167 struct dpi_clk_calc_ctx *ctx = data;
168
169
170
171
172
173
174 if (ctx->pck_min >= 100000000) {
175 if (lckd > 1 && lckd % 2 != 0)
176 return false;
177
178 if (pckd > 1 && pckd % 2 != 0)
179 return false;
180 }
181
182 ctx->dispc_cinfo.lck_div = lckd;
183 ctx->dispc_cinfo.pck_div = pckd;
184 ctx->dispc_cinfo.lck = lck;
185 ctx->dispc_cinfo.pck = pck;
186
187 return true;
188}
189
190
191static bool dpi_calc_hsdiv_cb(int m_dispc, unsigned long dispc,
192 void *data)
193{
194 struct dpi_clk_calc_ctx *ctx = data;
195
196 ctx->pll_cinfo.mX[ctx->clkout_idx] = m_dispc;
197 ctx->pll_cinfo.clkout[ctx->clkout_idx] = dispc;
198
199 return dispc_div_calc(dispc, ctx->pck_min, ctx->pck_max,
200 dpi_calc_dispc_cb, ctx);
201}
202
203
204static bool dpi_calc_pll_cb(int n, int m, unsigned long fint,
205 unsigned long clkdco,
206 void *data)
207{
208 struct dpi_clk_calc_ctx *ctx = data;
209
210 ctx->pll_cinfo.n = n;
211 ctx->pll_cinfo.m = m;
212 ctx->pll_cinfo.fint = fint;
213 ctx->pll_cinfo.clkdco = clkdco;
214
215 return dss_pll_hsdiv_calc_a(ctx->pll, clkdco,
216 ctx->pck_min, dss_feat_get_param_max(FEAT_PARAM_DSS_FCK),
217 dpi_calc_hsdiv_cb, ctx);
218}
219
220static bool dpi_calc_dss_cb(unsigned long fck, void *data)
221{
222 struct dpi_clk_calc_ctx *ctx = data;
223
224 ctx->fck = fck;
225
226 return dispc_div_calc(fck, ctx->pck_min, ctx->pck_max,
227 dpi_calc_dispc_cb, ctx);
228}
229
230static bool dpi_pll_clk_calc(struct dpi_data *dpi, unsigned long pck,
231 struct dpi_clk_calc_ctx *ctx)
232{
233 unsigned long clkin;
234
235 memset(ctx, 0, sizeof(*ctx));
236 ctx->pll = dpi->pll;
237 ctx->clkout_idx = dss_pll_get_clkout_idx_for_src(dpi->clk_src);
238
239 clkin = clk_get_rate(dpi->pll->clkin);
240
241 if (dpi->pll->hw->type == DSS_PLL_TYPE_A) {
242 unsigned long pll_min, pll_max;
243
244 ctx->pck_min = pck - 1000;
245 ctx->pck_max = pck + 1000;
246
247 pll_min = 0;
248 pll_max = 0;
249
250 return dss_pll_calc_a(ctx->pll, clkin,
251 pll_min, pll_max,
252 dpi_calc_pll_cb, ctx);
253 } else {
254 dss_pll_calc_b(dpi->pll, clkin, pck, &ctx->pll_cinfo);
255
256 ctx->dispc_cinfo.lck_div = 1;
257 ctx->dispc_cinfo.pck_div = 1;
258 ctx->dispc_cinfo.lck = ctx->pll_cinfo.clkout[0];
259 ctx->dispc_cinfo.pck = ctx->dispc_cinfo.lck;
260
261 return true;
262 }
263}
264
265static bool dpi_dss_clk_calc(unsigned long pck, struct dpi_clk_calc_ctx *ctx)
266{
267 int i;
268
269
270
271
272
273
274
275
276 for (i = 0; i < 25; ++i) {
277 bool ok;
278
279 memset(ctx, 0, sizeof(*ctx));
280 if (pck > 1000 * i * i * i)
281 ctx->pck_min = max(pck - 1000 * i * i * i, 0lu);
282 else
283 ctx->pck_min = 0;
284 ctx->pck_max = pck + 1000 * i * i * i;
285
286 ok = dss_div_calc(pck, ctx->pck_min, dpi_calc_dss_cb, ctx);
287 if (ok)
288 return ok;
289 }
290
291 return false;
292}
293
294
295
296static int dpi_set_pll_clk(struct dpi_data *dpi, enum omap_channel channel,
297 unsigned long pck_req, unsigned long *fck, int *lck_div,
298 int *pck_div)
299{
300 struct dpi_clk_calc_ctx ctx;
301 int r;
302 bool ok;
303
304 ok = dpi_pll_clk_calc(dpi, pck_req, &ctx);
305 if (!ok)
306 return -EINVAL;
307
308 r = dss_pll_set_config(dpi->pll, &ctx.pll_cinfo);
309 if (r)
310 return r;
311
312 dss_select_lcd_clk_source(channel, dpi->clk_src);
313
314 dpi->mgr_config.clock_info = ctx.dispc_cinfo;
315
316 *fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
317 *lck_div = ctx.dispc_cinfo.lck_div;
318 *pck_div = ctx.dispc_cinfo.pck_div;
319
320 return 0;
321}
322
323static int dpi_set_dispc_clk(struct dpi_data *dpi, unsigned long pck_req,
324 unsigned long *fck, int *lck_div, int *pck_div)
325{
326 struct dpi_clk_calc_ctx ctx;
327 int r;
328 bool ok;
329
330 ok = dpi_dss_clk_calc(pck_req, &ctx);
331 if (!ok)
332 return -EINVAL;
333
334 r = dss_set_fck_rate(ctx.fck);
335 if (r)
336 return r;
337
338 dpi->mgr_config.clock_info = ctx.dispc_cinfo;
339
340 *fck = ctx.fck;
341 *lck_div = ctx.dispc_cinfo.lck_div;
342 *pck_div = ctx.dispc_cinfo.pck_div;
343
344 return 0;
345}
346
347static int dpi_set_mode(struct dpi_data *dpi)
348{
349 struct omap_dss_device *out = &dpi->output;
350 enum omap_channel channel = out->dispc_channel;
351 struct videomode *vm = &dpi->vm;
352 int lck_div = 0, pck_div = 0;
353 unsigned long fck = 0;
354 unsigned long pck;
355 int r = 0;
356
357 if (dpi->pll)
358 r = dpi_set_pll_clk(dpi, channel, vm->pixelclock, &fck,
359 &lck_div, &pck_div);
360 else
361 r = dpi_set_dispc_clk(dpi, vm->pixelclock, &fck,
362 &lck_div, &pck_div);
363 if (r)
364 return r;
365
366 pck = fck / lck_div / pck_div;
367
368 if (pck != vm->pixelclock) {
369 DSSWARN("Could not find exact pixel clock. Requested %lu Hz, got %lu Hz\n",
370 vm->pixelclock, pck);
371
372 vm->pixelclock = pck;
373 }
374
375 dss_mgr_set_timings(channel, vm);
376
377 return 0;
378}
379
380static void dpi_config_lcd_manager(struct dpi_data *dpi)
381{
382 struct omap_dss_device *out = &dpi->output;
383 enum omap_channel channel = out->dispc_channel;
384
385 dpi->mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
386
387 dpi->mgr_config.stallmode = false;
388 dpi->mgr_config.fifohandcheck = false;
389
390 dpi->mgr_config.video_port_width = dpi->data_lines;
391
392 dpi->mgr_config.lcden_sig_polarity = 0;
393
394 dss_mgr_set_lcd_config(channel, &dpi->mgr_config);
395}
396
397static int dpi_display_enable(struct omap_dss_device *dssdev)
398{
399 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
400 struct omap_dss_device *out = &dpi->output;
401 enum omap_channel channel = out->dispc_channel;
402 int r;
403
404 mutex_lock(&dpi->lock);
405
406 if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi->vdds_dsi_reg) {
407 DSSERR("no VDSS_DSI regulator\n");
408 r = -ENODEV;
409 goto err_no_reg;
410 }
411
412 if (!out->dispc_channel_connected) {
413 DSSERR("failed to enable display: no output/manager\n");
414 r = -ENODEV;
415 goto err_no_out_mgr;
416 }
417
418 if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
419 r = regulator_enable(dpi->vdds_dsi_reg);
420 if (r)
421 goto err_reg_enable;
422 }
423
424 r = dispc_runtime_get();
425 if (r)
426 goto err_get_dispc;
427
428 r = dss_dpi_select_source(out->port_num, channel);
429 if (r)
430 goto err_src_sel;
431
432 if (dpi->pll) {
433 r = dss_pll_enable(dpi->pll);
434 if (r)
435 goto err_pll_init;
436 }
437
438 r = dpi_set_mode(dpi);
439 if (r)
440 goto err_set_mode;
441
442 dpi_config_lcd_manager(dpi);
443
444 mdelay(2);
445
446 r = dss_mgr_enable(channel);
447 if (r)
448 goto err_mgr_enable;
449
450 mutex_unlock(&dpi->lock);
451
452 return 0;
453
454err_mgr_enable:
455err_set_mode:
456 if (dpi->pll)
457 dss_pll_disable(dpi->pll);
458err_pll_init:
459err_src_sel:
460 dispc_runtime_put();
461err_get_dispc:
462 if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
463 regulator_disable(dpi->vdds_dsi_reg);
464err_reg_enable:
465err_no_out_mgr:
466err_no_reg:
467 mutex_unlock(&dpi->lock);
468 return r;
469}
470
471static void dpi_display_disable(struct omap_dss_device *dssdev)
472{
473 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
474 enum omap_channel channel = dpi->output.dispc_channel;
475
476 mutex_lock(&dpi->lock);
477
478 dss_mgr_disable(channel);
479
480 if (dpi->pll) {
481 dss_select_lcd_clk_source(channel, DSS_CLK_SRC_FCK);
482 dss_pll_disable(dpi->pll);
483 }
484
485 dispc_runtime_put();
486
487 if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
488 regulator_disable(dpi->vdds_dsi_reg);
489
490 mutex_unlock(&dpi->lock);
491}
492
493static void dpi_set_timings(struct omap_dss_device *dssdev,
494 struct videomode *vm)
495{
496 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
497
498 DSSDBG("dpi_set_timings\n");
499
500 mutex_lock(&dpi->lock);
501
502 dpi->vm = *vm;
503
504 mutex_unlock(&dpi->lock);
505}
506
507static void dpi_get_timings(struct omap_dss_device *dssdev,
508 struct videomode *vm)
509{
510 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
511
512 mutex_lock(&dpi->lock);
513
514 *vm = dpi->vm;
515
516 mutex_unlock(&dpi->lock);
517}
518
519static int dpi_check_timings(struct omap_dss_device *dssdev,
520 struct videomode *vm)
521{
522 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
523 enum omap_channel channel = dpi->output.dispc_channel;
524 int lck_div, pck_div;
525 unsigned long fck;
526 unsigned long pck;
527 struct dpi_clk_calc_ctx ctx;
528 bool ok;
529
530 if (vm->hactive % 8 != 0)
531 return -EINVAL;
532
533 if (!dispc_mgr_timings_ok(channel, vm))
534 return -EINVAL;
535
536 if (vm->pixelclock == 0)
537 return -EINVAL;
538
539 if (dpi->pll) {
540 ok = dpi_pll_clk_calc(dpi, vm->pixelclock, &ctx);
541 if (!ok)
542 return -EINVAL;
543
544 fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
545 } else {
546 ok = dpi_dss_clk_calc(vm->pixelclock, &ctx);
547 if (!ok)
548 return -EINVAL;
549
550 fck = ctx.fck;
551 }
552
553 lck_div = ctx.dispc_cinfo.lck_div;
554 pck_div = ctx.dispc_cinfo.pck_div;
555
556 pck = fck / lck_div / pck_div;
557
558 vm->pixelclock = pck;
559
560 return 0;
561}
562
563static int dpi_verify_pll(struct dss_pll *pll)
564{
565 int r;
566
567
568
569 r = dss_pll_enable(pll);
570 if (r)
571 return r;
572
573 dss_pll_disable(pll);
574
575 return 0;
576}
577
578static int dpi_init_regulator(struct dpi_data *dpi)
579{
580 struct regulator *vdds_dsi;
581
582 if (!dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
583 return 0;
584
585 if (dpi->vdds_dsi_reg)
586 return 0;
587
588 vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
589 if (IS_ERR(vdds_dsi)) {
590 if (PTR_ERR(vdds_dsi) != -EPROBE_DEFER)
591 DSSERR("can't get VDDS_DSI regulator\n");
592 return PTR_ERR(vdds_dsi);
593 }
594
595 dpi->vdds_dsi_reg = vdds_dsi;
596
597 return 0;
598}
599
600static void dpi_init_pll(struct dpi_data *dpi)
601{
602 struct dss_pll *pll;
603
604 if (dpi->pll)
605 return;
606
607 dpi->clk_src = dpi_get_clk_src(dpi->output.dispc_channel);
608
609 pll = dss_pll_find_by_src(dpi->clk_src);
610 if (!pll)
611 return;
612
613 if (dpi_verify_pll(pll)) {
614 DSSWARN("PLL not operational\n");
615 return;
616 }
617
618 dpi->pll = pll;
619}
620
621
622
623
624
625
626
627static enum omap_channel dpi_get_channel(int port_num)
628{
629 switch (omapdss_get_version()) {
630 case OMAPDSS_VER_OMAP24xx:
631 case OMAPDSS_VER_OMAP34xx_ES1:
632 case OMAPDSS_VER_OMAP34xx_ES3:
633 case OMAPDSS_VER_OMAP3630:
634 case OMAPDSS_VER_AM35xx:
635 case OMAPDSS_VER_AM43xx:
636 return OMAP_DSS_CHANNEL_LCD;
637
638 case OMAPDSS_VER_DRA7xx:
639 switch (port_num) {
640 case 2:
641 return OMAP_DSS_CHANNEL_LCD3;
642 case 1:
643 return OMAP_DSS_CHANNEL_LCD2;
644 case 0:
645 default:
646 return OMAP_DSS_CHANNEL_LCD;
647 }
648
649 case OMAPDSS_VER_OMAP4430_ES1:
650 case OMAPDSS_VER_OMAP4430_ES2:
651 case OMAPDSS_VER_OMAP4:
652 return OMAP_DSS_CHANNEL_LCD2;
653
654 case OMAPDSS_VER_OMAP5:
655 return OMAP_DSS_CHANNEL_LCD3;
656
657 default:
658 DSSWARN("unsupported DSS version\n");
659 return OMAP_DSS_CHANNEL_LCD;
660 }
661}
662
663static int dpi_connect(struct omap_dss_device *dssdev,
664 struct omap_dss_device *dst)
665{
666 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
667 enum omap_channel channel = dpi->output.dispc_channel;
668 int r;
669
670 r = dpi_init_regulator(dpi);
671 if (r)
672 return r;
673
674 dpi_init_pll(dpi);
675
676 r = dss_mgr_connect(channel, dssdev);
677 if (r)
678 return r;
679
680 r = omapdss_output_set_device(dssdev, dst);
681 if (r) {
682 DSSERR("failed to connect output to new device: %s\n",
683 dst->name);
684 dss_mgr_disconnect(channel, dssdev);
685 return r;
686 }
687
688 return 0;
689}
690
691static void dpi_disconnect(struct omap_dss_device *dssdev,
692 struct omap_dss_device *dst)
693{
694 struct dpi_data *dpi = dpi_get_data_from_dssdev(dssdev);
695 enum omap_channel channel = dpi->output.dispc_channel;
696
697 WARN_ON(dst != dssdev->dst);
698
699 if (dst != dssdev->dst)
700 return;
701
702 omapdss_output_unset_device(dssdev);
703
704 dss_mgr_disconnect(channel, dssdev);
705}
706
707static const struct omapdss_dpi_ops dpi_ops = {
708 .connect = dpi_connect,
709 .disconnect = dpi_disconnect,
710
711 .enable = dpi_display_enable,
712 .disable = dpi_display_disable,
713
714 .check_timings = dpi_check_timings,
715 .set_timings = dpi_set_timings,
716 .get_timings = dpi_get_timings,
717};
718
719static void dpi_init_output_port(struct platform_device *pdev,
720 struct device_node *port)
721{
722 struct dpi_data *dpi = port->data;
723 struct omap_dss_device *out = &dpi->output;
724 int r;
725 u32 port_num;
726
727 r = of_property_read_u32(port, "reg", &port_num);
728 if (r)
729 port_num = 0;
730
731 switch (port_num) {
732 case 2:
733 out->name = "dpi.2";
734 break;
735 case 1:
736 out->name = "dpi.1";
737 break;
738 case 0:
739 default:
740 out->name = "dpi.0";
741 break;
742 }
743
744 out->dev = &pdev->dev;
745 out->id = OMAP_DSS_OUTPUT_DPI;
746 out->output_type = OMAP_DISPLAY_TYPE_DPI;
747 out->dispc_channel = dpi_get_channel(port_num);
748 out->port_num = port_num;
749 out->ops.dpi = &dpi_ops;
750 out->owner = THIS_MODULE;
751
752 omapdss_register_output(out);
753}
754
755static void dpi_uninit_output_port(struct device_node *port)
756{
757 struct dpi_data *dpi = port->data;
758 struct omap_dss_device *out = &dpi->output;
759
760 omapdss_unregister_output(out);
761}
762
763int dpi_init_port(struct platform_device *pdev, struct device_node *port)
764{
765 struct dpi_data *dpi;
766 struct device_node *ep;
767 u32 datalines;
768 int r;
769
770 dpi = devm_kzalloc(&pdev->dev, sizeof(*dpi), GFP_KERNEL);
771 if (!dpi)
772 return -ENOMEM;
773
774 ep = of_get_next_child(port, NULL);
775 if (!ep)
776 return 0;
777
778 r = of_property_read_u32(ep, "data-lines", &datalines);
779 if (r) {
780 DSSERR("failed to parse datalines\n");
781 goto err_datalines;
782 }
783
784 dpi->data_lines = datalines;
785
786 of_node_put(ep);
787
788 dpi->pdev = pdev;
789 port->data = dpi;
790
791 mutex_init(&dpi->lock);
792
793 dpi_init_output_port(pdev, port);
794
795 dpi->port_initialized = true;
796
797 return 0;
798
799err_datalines:
800 of_node_put(ep);
801
802 return r;
803}
804
805void dpi_uninit_port(struct device_node *port)
806{
807 struct dpi_data *dpi = port->data;
808
809 if (!dpi->port_initialized)
810 return;
811
812 dpi_uninit_output_port(port);
813}
814