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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* drivers/gpu/drm/exynos/exynos7_drm_decon.c
3 *
4 * Copyright (C) 2014 Samsung Electronics Co.Ltd
5 * Authors:
6 * Akshu Agarwal <akshua@gmail.com>
7 * Ajay Kumar <ajaykumar.rs@samsung.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/component.h>
12#include <linux/kernel.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/of_device.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18
19#include <video/of_display_timing.h>
20#include <video/of_videomode.h>
21
22#include <drm/drm_fourcc.h>
23#include <drm/drm_vblank.h>
24#include <drm/exynos_drm.h>
25
26#include "exynos_drm_crtc.h"
27#include "exynos_drm_drv.h"
28#include "exynos_drm_fb.h"
29#include "exynos_drm_plane.h"
30#include "regs-decon7.h"
31
32/*
33 * DECON stands for Display and Enhancement controller.
34 */
35
36#define MIN_FB_WIDTH_FOR_16WORD_BURST 128
37
38#define WINDOWS_NR 2
39
40struct decon_context {
41 struct device *dev;
42 struct drm_device *drm_dev;
43 struct exynos_drm_crtc *crtc;
44 struct exynos_drm_plane planes[WINDOWS_NR];
45 struct exynos_drm_plane_config configs[WINDOWS_NR];
46 struct clk *pclk;
47 struct clk *aclk;
48 struct clk *eclk;
49 struct clk *vclk;
50 void __iomem *regs;
51 unsigned long irq_flags;
52 bool i80_if;
53 bool suspended;
54 wait_queue_head_t wait_vsync_queue;
55 atomic_t wait_vsync_event;
56
57 struct drm_encoder *encoder;
58};
59
60static const struct of_device_id decon_driver_dt_match[] = {
61 {.compatible = "samsung,exynos7-decon"},
62 {},
63};
64MODULE_DEVICE_TABLE(of, decon_driver_dt_match);
65
66static const uint32_t decon_formats[] = {
67 DRM_FORMAT_RGB565,
68 DRM_FORMAT_XRGB8888,
69 DRM_FORMAT_XBGR8888,
70 DRM_FORMAT_RGBX8888,
71 DRM_FORMAT_BGRX8888,
72 DRM_FORMAT_ARGB8888,
73 DRM_FORMAT_ABGR8888,
74 DRM_FORMAT_RGBA8888,
75 DRM_FORMAT_BGRA8888,
76};
77
78static const enum drm_plane_type decon_win_types[WINDOWS_NR] = {
79 DRM_PLANE_TYPE_PRIMARY,
80 DRM_PLANE_TYPE_CURSOR,
81};
82
83static void decon_wait_for_vblank(struct exynos_drm_crtc *crtc)
84{
85 struct decon_context *ctx = crtc->ctx;
86
87 if (ctx->suspended)
88 return;
89
90 atomic_set(&ctx->wait_vsync_event, 1);
91
92 /*
93 * wait for DECON to signal VSYNC interrupt or return after
94 * timeout which is set to 50ms (refresh rate of 20).
95 */
96 if (!wait_event_timeout(ctx->wait_vsync_queue,
97 !atomic_read(&ctx->wait_vsync_event),
98 HZ/20))
99 DRM_DEV_DEBUG_KMS(ctx->dev, "vblank wait timed out.\n");
100}
101
102static void decon_clear_channels(struct exynos_drm_crtc *crtc)
103{
104 struct decon_context *ctx = crtc->ctx;
105 unsigned int win, ch_enabled = 0;
106
107 /* Check if any channel is enabled. */
108 for (win = 0; win < WINDOWS_NR; win++) {
109 u32 val = readl(ctx->regs + WINCON(win));
110
111 if (val & WINCONx_ENWIN) {
112 val &= ~WINCONx_ENWIN;
113 writel(val, ctx->regs + WINCON(win));
114 ch_enabled = 1;
115 }
116 }
117
118 /* Wait for vsync, as disable channel takes effect at next vsync */
119 if (ch_enabled)
120 decon_wait_for_vblank(ctx->crtc);
121}
122
123static int decon_ctx_initialize(struct decon_context *ctx,
124 struct drm_device *drm_dev)
125{
126 ctx->drm_dev = drm_dev;
127
128 decon_clear_channels(ctx->crtc);
129
130 return exynos_drm_register_dma(drm_dev, ctx->dev);
131}
132
133static void decon_ctx_remove(struct decon_context *ctx)
134{
135 /* detach this sub driver from iommu mapping if supported. */
136 exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev);
137}
138
139static u32 decon_calc_clkdiv(struct decon_context *ctx,
140 const struct drm_display_mode *mode)
141{
142 unsigned long ideal_clk = mode->htotal * mode->vtotal * mode->vrefresh;
143 u32 clkdiv;
144
145 /* Find the clock divider value that gets us closest to ideal_clk */
146 clkdiv = DIV_ROUND_UP(clk_get_rate(ctx->vclk), ideal_clk);
147
148 return (clkdiv < 0x100) ? clkdiv : 0xff;
149}
150
151static void decon_commit(struct exynos_drm_crtc *crtc)
152{
153 struct decon_context *ctx = crtc->ctx;
154 struct drm_display_mode *mode = &crtc->base.state->adjusted_mode;
155 u32 val, clkdiv;
156
157 if (ctx->suspended)
158 return;
159
160 /* nothing to do if we haven't set the mode yet */
161 if (mode->htotal == 0 || mode->vtotal == 0)
162 return;
163
164 if (!ctx->i80_if) {
165 int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
166 /* setup vertical timing values. */
167 vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
168 vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
169 vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;
170
171 val = VIDTCON0_VBPD(vbpd - 1) | VIDTCON0_VFPD(vfpd - 1);
172 writel(val, ctx->regs + VIDTCON0);
173
174 val = VIDTCON1_VSPW(vsync_len - 1);
175 writel(val, ctx->regs + VIDTCON1);
176
177 /* setup horizontal timing values. */
178 hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
179 hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
180 hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;
181
182 /* setup horizontal timing values. */
183 val = VIDTCON2_HBPD(hbpd - 1) | VIDTCON2_HFPD(hfpd - 1);
184 writel(val, ctx->regs + VIDTCON2);
185
186 val = VIDTCON3_HSPW(hsync_len - 1);
187 writel(val, ctx->regs + VIDTCON3);
188 }
189
190 /* setup horizontal and vertical display size. */
191 val = VIDTCON4_LINEVAL(mode->vdisplay - 1) |
192 VIDTCON4_HOZVAL(mode->hdisplay - 1);
193 writel(val, ctx->regs + VIDTCON4);
194
195 writel(mode->vdisplay - 1, ctx->regs + LINECNT_OP_THRESHOLD);
196
197 /*
198 * fields of register with prefix '_F' would be updated
199 * at vsync(same as dma start)
200 */
201 val = VIDCON0_ENVID | VIDCON0_ENVID_F;
202 writel(val, ctx->regs + VIDCON0);
203
204 clkdiv = decon_calc_clkdiv(ctx, mode);
205 if (clkdiv > 1) {
206 val = VCLKCON1_CLKVAL_NUM_VCLK(clkdiv - 1);
207 writel(val, ctx->regs + VCLKCON1);
208 writel(val, ctx->regs + VCLKCON2);
209 }
210
211 val = readl(ctx->regs + DECON_UPDATE);
212 val |= DECON_UPDATE_STANDALONE_F;
213 writel(val, ctx->regs + DECON_UPDATE);
214}
215
216static int decon_enable_vblank(struct exynos_drm_crtc *crtc)
217{
218 struct decon_context *ctx = crtc->ctx;
219 u32 val;
220
221 if (ctx->suspended)
222 return -EPERM;
223
224 if (!test_and_set_bit(0, &ctx->irq_flags)) {
225 val = readl(ctx->regs + VIDINTCON0);
226
227 val |= VIDINTCON0_INT_ENABLE;
228
229 if (!ctx->i80_if) {
230 val |= VIDINTCON0_INT_FRAME;
231 val &= ~VIDINTCON0_FRAMESEL0_MASK;
232 val |= VIDINTCON0_FRAMESEL0_VSYNC;
233 }
234
235 writel(val, ctx->regs + VIDINTCON0);
236 }
237
238 return 0;
239}
240
241static void decon_disable_vblank(struct exynos_drm_crtc *crtc)
242{
243 struct decon_context *ctx = crtc->ctx;
244 u32 val;
245
246 if (ctx->suspended)
247 return;
248
249 if (test_and_clear_bit(0, &ctx->irq_flags)) {
250 val = readl(ctx->regs + VIDINTCON0);
251
252 val &= ~VIDINTCON0_INT_ENABLE;
253 if (!ctx->i80_if)
254 val &= ~VIDINTCON0_INT_FRAME;
255
256 writel(val, ctx->regs + VIDINTCON0);
257 }
258}
259
260static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win,
261 struct drm_framebuffer *fb)
262{
263 unsigned long val;
264 int padding;
265
266 val = readl(ctx->regs + WINCON(win));
267 val &= ~WINCONx_BPPMODE_MASK;
268
269 switch (fb->format->format) {
270 case DRM_FORMAT_RGB565:
271 val |= WINCONx_BPPMODE_16BPP_565;
272 val |= WINCONx_BURSTLEN_16WORD;
273 break;
274 case DRM_FORMAT_XRGB8888:
275 val |= WINCONx_BPPMODE_24BPP_xRGB;
276 val |= WINCONx_BURSTLEN_16WORD;
277 break;
278 case DRM_FORMAT_XBGR8888:
279 val |= WINCONx_BPPMODE_24BPP_xBGR;
280 val |= WINCONx_BURSTLEN_16WORD;
281 break;
282 case DRM_FORMAT_RGBX8888:
283 val |= WINCONx_BPPMODE_24BPP_RGBx;
284 val |= WINCONx_BURSTLEN_16WORD;
285 break;
286 case DRM_FORMAT_BGRX8888:
287 val |= WINCONx_BPPMODE_24BPP_BGRx;
288 val |= WINCONx_BURSTLEN_16WORD;
289 break;
290 case DRM_FORMAT_ARGB8888:
291 val |= WINCONx_BPPMODE_32BPP_ARGB | WINCONx_BLD_PIX |
292 WINCONx_ALPHA_SEL;
293 val |= WINCONx_BURSTLEN_16WORD;
294 break;
295 case DRM_FORMAT_ABGR8888:
296 val |= WINCONx_BPPMODE_32BPP_ABGR | WINCONx_BLD_PIX |
297 WINCONx_ALPHA_SEL;
298 val |= WINCONx_BURSTLEN_16WORD;
299 break;
300 case DRM_FORMAT_RGBA8888:
301 val |= WINCONx_BPPMODE_32BPP_RGBA | WINCONx_BLD_PIX |
302 WINCONx_ALPHA_SEL;
303 val |= WINCONx_BURSTLEN_16WORD;
304 break;
305 case DRM_FORMAT_BGRA8888:
306 default:
307 val |= WINCONx_BPPMODE_32BPP_BGRA | WINCONx_BLD_PIX |
308 WINCONx_ALPHA_SEL;
309 val |= WINCONx_BURSTLEN_16WORD;
310 break;
311 }
312
313 DRM_DEV_DEBUG_KMS(ctx->dev, "cpp = %d\n", fb->format->cpp[0]);
314
315 /*
316 * In case of exynos, setting dma-burst to 16Word causes permanent
317 * tearing for very small buffers, e.g. cursor buffer. Burst Mode
318 * switching which is based on plane size is not recommended as
319 * plane size varies a lot towards the end of the screen and rapid
320 * movement causes unstable DMA which results into iommu crash/tear.
321 */
322
323 padding = (fb->pitches[0] / fb->format->cpp[0]) - fb->width;
324 if (fb->width + padding < MIN_FB_WIDTH_FOR_16WORD_BURST) {
325 val &= ~WINCONx_BURSTLEN_MASK;
326 val |= WINCONx_BURSTLEN_8WORD;
327 }
328
329 writel(val, ctx->regs + WINCON(win));
330}
331
332static void decon_win_set_colkey(struct decon_context *ctx, unsigned int win)
333{
334 unsigned int keycon0 = 0, keycon1 = 0;
335
336 keycon0 = ~(WxKEYCON0_KEYBL_EN | WxKEYCON0_KEYEN_F |
337 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
338
339 keycon1 = WxKEYCON1_COLVAL(0xffffffff);
340
341 writel(keycon0, ctx->regs + WKEYCON0_BASE(win));
342 writel(keycon1, ctx->regs + WKEYCON1_BASE(win));
343}
344
345/**
346 * shadow_protect_win() - disable updating values from shadow registers at vsync
347 *
348 * @win: window to protect registers for
349 * @protect: 1 to protect (disable updates)
350 */
351static void decon_shadow_protect_win(struct decon_context *ctx,
352 unsigned int win, bool protect)
353{
354 u32 bits, val;
355
356 bits = SHADOWCON_WINx_PROTECT(win);
357
358 val = readl(ctx->regs + SHADOWCON);
359 if (protect)
360 val |= bits;
361 else
362 val &= ~bits;
363 writel(val, ctx->regs + SHADOWCON);
364}
365
366static void decon_atomic_begin(struct exynos_drm_crtc *crtc)
367{
368 struct decon_context *ctx = crtc->ctx;
369 int i;
370
371 if (ctx->suspended)
372 return;
373
374 for (i = 0; i < WINDOWS_NR; i++)
375 decon_shadow_protect_win(ctx, i, true);
376}
377
378static void decon_update_plane(struct exynos_drm_crtc *crtc,
379 struct exynos_drm_plane *plane)
380{
381 struct exynos_drm_plane_state *state =
382 to_exynos_plane_state(plane->base.state);
383 struct decon_context *ctx = crtc->ctx;
384 struct drm_framebuffer *fb = state->base.fb;
385 int padding;
386 unsigned long val, alpha;
387 unsigned int last_x;
388 unsigned int last_y;
389 unsigned int win = plane->index;
390 unsigned int cpp = fb->format->cpp[0];
391 unsigned int pitch = fb->pitches[0];
392
393 if (ctx->suspended)
394 return;
395
396 /*
397 * SHADOWCON/PRTCON register is used for enabling timing.
398 *
399 * for example, once only width value of a register is set,
400 * if the dma is started then decon hardware could malfunction so
401 * with protect window setting, the register fields with prefix '_F'
402 * wouldn't be updated at vsync also but updated once unprotect window
403 * is set.
404 */
405
406 /* buffer start address */
407 val = (unsigned long)exynos_drm_fb_dma_addr(fb, 0);
408 writel(val, ctx->regs + VIDW_BUF_START(win));
409
410 padding = (pitch / cpp) - fb->width;
411
412 /* buffer size */
413 writel(fb->width + padding, ctx->regs + VIDW_WHOLE_X(win));
414 writel(fb->height, ctx->regs + VIDW_WHOLE_Y(win));
415
416 /* offset from the start of the buffer to read */
417 writel(state->src.x, ctx->regs + VIDW_OFFSET_X(win));
418 writel(state->src.y, ctx->regs + VIDW_OFFSET_Y(win));
419
420 DRM_DEV_DEBUG_KMS(ctx->dev, "start addr = 0x%lx\n",
421 (unsigned long)val);
422 DRM_DEV_DEBUG_KMS(ctx->dev, "ovl_width = %d, ovl_height = %d\n",
423 state->crtc.w, state->crtc.h);
424
425 val = VIDOSDxA_TOPLEFT_X(state->crtc.x) |
426 VIDOSDxA_TOPLEFT_Y(state->crtc.y);
427 writel(val, ctx->regs + VIDOSD_A(win));
428
429 last_x = state->crtc.x + state->crtc.w;
430 if (last_x)
431 last_x--;
432 last_y = state->crtc.y + state->crtc.h;
433 if (last_y)
434 last_y--;
435
436 val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y);
437
438 writel(val, ctx->regs + VIDOSD_B(win));
439
440 DRM_DEV_DEBUG_KMS(ctx->dev, "osd pos: tx = %d, ty = %d, bx = %d, by = %d\n",
441 state->crtc.x, state->crtc.y, last_x, last_y);
442
443 /* OSD alpha */
444 alpha = VIDOSDxC_ALPHA0_R_F(0x0) |
445 VIDOSDxC_ALPHA0_G_F(0x0) |
446 VIDOSDxC_ALPHA0_B_F(0x0);
447
448 writel(alpha, ctx->regs + VIDOSD_C(win));
449
450 alpha = VIDOSDxD_ALPHA1_R_F(0xff) |
451 VIDOSDxD_ALPHA1_G_F(0xff) |
452 VIDOSDxD_ALPHA1_B_F(0xff);
453
454 writel(alpha, ctx->regs + VIDOSD_D(win));
455
456 decon_win_set_pixfmt(ctx, win, fb);
457
458 /* hardware window 0 doesn't support color key. */
459 if (win != 0)
460 decon_win_set_colkey(ctx, win);
461
462 /* wincon */
463 val = readl(ctx->regs + WINCON(win));
464 val |= WINCONx_TRIPLE_BUF_MODE;
465 val |= WINCONx_ENWIN;
466 writel(val, ctx->regs + WINCON(win));
467
468 /* Enable DMA channel and unprotect windows */
469 decon_shadow_protect_win(ctx, win, false);
470
471 val = readl(ctx->regs + DECON_UPDATE);
472 val |= DECON_UPDATE_STANDALONE_F;
473 writel(val, ctx->regs + DECON_UPDATE);
474}
475
476static void decon_disable_plane(struct exynos_drm_crtc *crtc,
477 struct exynos_drm_plane *plane)
478{
479 struct decon_context *ctx = crtc->ctx;
480 unsigned int win = plane->index;
481 u32 val;
482
483 if (ctx->suspended)
484 return;
485
486 /* protect windows */
487 decon_shadow_protect_win(ctx, win, true);
488
489 /* wincon */
490 val = readl(ctx->regs + WINCON(win));
491 val &= ~WINCONx_ENWIN;
492 writel(val, ctx->regs + WINCON(win));
493
494 val = readl(ctx->regs + DECON_UPDATE);
495 val |= DECON_UPDATE_STANDALONE_F;
496 writel(val, ctx->regs + DECON_UPDATE);
497}
498
499static void decon_atomic_flush(struct exynos_drm_crtc *crtc)
500{
501 struct decon_context *ctx = crtc->ctx;
502 int i;
503
504 if (ctx->suspended)
505 return;
506
507 for (i = 0; i < WINDOWS_NR; i++)
508 decon_shadow_protect_win(ctx, i, false);
509 exynos_crtc_handle_event(crtc);
510}
511
512static void decon_init(struct decon_context *ctx)
513{
514 u32 val;
515
516 writel(VIDCON0_SWRESET, ctx->regs + VIDCON0);
517
518 val = VIDOUTCON0_DISP_IF_0_ON;
519 if (!ctx->i80_if)
520 val |= VIDOUTCON0_RGBIF;
521 writel(val, ctx->regs + VIDOUTCON0);
522
523 writel(VCLKCON0_CLKVALUP | VCLKCON0_VCLKFREE, ctx->regs + VCLKCON0);
524
525 if (!ctx->i80_if)
526 writel(VIDCON1_VCLK_HOLD, ctx->regs + VIDCON1(0));
527}
528
529static void decon_enable(struct exynos_drm_crtc *crtc)
530{
531 struct decon_context *ctx = crtc->ctx;
532
533 if (!ctx->suspended)
534 return;
535
536 pm_runtime_get_sync(ctx->dev);
537
538 decon_init(ctx);
539
540 /* if vblank was enabled status, enable it again. */
541 if (test_and_clear_bit(0, &ctx->irq_flags))
542 decon_enable_vblank(ctx->crtc);
543
544 decon_commit(ctx->crtc);
545
546 ctx->suspended = false;
547}
548
549static void decon_disable(struct exynos_drm_crtc *crtc)
550{
551 struct decon_context *ctx = crtc->ctx;
552 int i;
553
554 if (ctx->suspended)
555 return;
556
557 /*
558 * We need to make sure that all windows are disabled before we
559 * suspend that connector. Otherwise we might try to scan from
560 * a destroyed buffer later.
561 */
562 for (i = 0; i < WINDOWS_NR; i++)
563 decon_disable_plane(crtc, &ctx->planes[i]);
564
565 pm_runtime_put_sync(ctx->dev);
566
567 ctx->suspended = true;
568}
569
570static const struct exynos_drm_crtc_ops decon_crtc_ops = {
571 .enable = decon_enable,
572 .disable = decon_disable,
573 .enable_vblank = decon_enable_vblank,
574 .disable_vblank = decon_disable_vblank,
575 .atomic_begin = decon_atomic_begin,
576 .update_plane = decon_update_plane,
577 .disable_plane = decon_disable_plane,
578 .atomic_flush = decon_atomic_flush,
579};
580
581
582static irqreturn_t decon_irq_handler(int irq, void *dev_id)
583{
584 struct decon_context *ctx = (struct decon_context *)dev_id;
585 u32 val, clear_bit;
586
587 val = readl(ctx->regs + VIDINTCON1);
588
589 clear_bit = ctx->i80_if ? VIDINTCON1_INT_I80 : VIDINTCON1_INT_FRAME;
590 if (val & clear_bit)
591 writel(clear_bit, ctx->regs + VIDINTCON1);
592
593 /* check the crtc is detached already from encoder */
594 if (!ctx->drm_dev)
595 goto out;
596
597 if (!ctx->i80_if) {
598 drm_crtc_handle_vblank(&ctx->crtc->base);
599
600 /* set wait vsync event to zero and wake up queue. */
601 if (atomic_read(&ctx->wait_vsync_event)) {
602 atomic_set(&ctx->wait_vsync_event, 0);
603 wake_up(&ctx->wait_vsync_queue);
604 }
605 }
606out:
607 return IRQ_HANDLED;
608}
609
610static int decon_bind(struct device *dev, struct device *master, void *data)
611{
612 struct decon_context *ctx = dev_get_drvdata(dev);
613 struct drm_device *drm_dev = data;
614 struct exynos_drm_plane *exynos_plane;
615 unsigned int i;
616 int ret;
617
618 ret = decon_ctx_initialize(ctx, drm_dev);
619 if (ret) {
620 DRM_DEV_ERROR(dev, "decon_ctx_initialize failed.\n");
621 return ret;
622 }
623
624 for (i = 0; i < WINDOWS_NR; i++) {
625 ctx->configs[i].pixel_formats = decon_formats;
626 ctx->configs[i].num_pixel_formats = ARRAY_SIZE(decon_formats);
627 ctx->configs[i].zpos = i;
628 ctx->configs[i].type = decon_win_types[i];
629
630 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
631 &ctx->configs[i]);
632 if (ret)
633 return ret;
634 }
635
636 exynos_plane = &ctx->planes[DEFAULT_WIN];
637 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
638 EXYNOS_DISPLAY_TYPE_LCD, &decon_crtc_ops, ctx);
639 if (IS_ERR(ctx->crtc)) {
640 decon_ctx_remove(ctx);
641 return PTR_ERR(ctx->crtc);
642 }
643
644 if (ctx->encoder)
645 exynos_dpi_bind(drm_dev, ctx->encoder);
646
647 return 0;
648
649}
650
651static void decon_unbind(struct device *dev, struct device *master,
652 void *data)
653{
654 struct decon_context *ctx = dev_get_drvdata(dev);
655
656 decon_disable(ctx->crtc);
657
658 if (ctx->encoder)
659 exynos_dpi_remove(ctx->encoder);
660
661 decon_ctx_remove(ctx);
662}
663
664static const struct component_ops decon_component_ops = {
665 .bind = decon_bind,
666 .unbind = decon_unbind,
667};
668
669static int decon_probe(struct platform_device *pdev)
670{
671 struct device *dev = &pdev->dev;
672 struct decon_context *ctx;
673 struct device_node *i80_if_timings;
674 struct resource *res;
675 int ret;
676
677 if (!dev->of_node)
678 return -ENODEV;
679
680 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
681 if (!ctx)
682 return -ENOMEM;
683
684 ctx->dev = dev;
685 ctx->suspended = true;
686
687 i80_if_timings = of_get_child_by_name(dev->of_node, "i80-if-timings");
688 if (i80_if_timings)
689 ctx->i80_if = true;
690 of_node_put(i80_if_timings);
691
692 ctx->regs = of_iomap(dev->of_node, 0);
693 if (!ctx->regs)
694 return -ENOMEM;
695
696 ctx->pclk = devm_clk_get(dev, "pclk_decon0");
697 if (IS_ERR(ctx->pclk)) {
698 dev_err(dev, "failed to get bus clock pclk\n");
699 ret = PTR_ERR(ctx->pclk);
700 goto err_iounmap;
701 }
702
703 ctx->aclk = devm_clk_get(dev, "aclk_decon0");
704 if (IS_ERR(ctx->aclk)) {
705 dev_err(dev, "failed to get bus clock aclk\n");
706 ret = PTR_ERR(ctx->aclk);
707 goto err_iounmap;
708 }
709
710 ctx->eclk = devm_clk_get(dev, "decon0_eclk");
711 if (IS_ERR(ctx->eclk)) {
712 dev_err(dev, "failed to get eclock\n");
713 ret = PTR_ERR(ctx->eclk);
714 goto err_iounmap;
715 }
716
717 ctx->vclk = devm_clk_get(dev, "decon0_vclk");
718 if (IS_ERR(ctx->vclk)) {
719 dev_err(dev, "failed to get vclock\n");
720 ret = PTR_ERR(ctx->vclk);
721 goto err_iounmap;
722 }
723
724 res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
725 ctx->i80_if ? "lcd_sys" : "vsync");
726 if (!res) {
727 dev_err(dev, "irq request failed.\n");
728 ret = -ENXIO;
729 goto err_iounmap;
730 }
731
732 ret = devm_request_irq(dev, res->start, decon_irq_handler,
733 0, "drm_decon", ctx);
734 if (ret) {
735 dev_err(dev, "irq request failed.\n");
736 goto err_iounmap;
737 }
738
739 init_waitqueue_head(&ctx->wait_vsync_queue);
740 atomic_set(&ctx->wait_vsync_event, 0);
741
742 platform_set_drvdata(pdev, ctx);
743
744 ctx->encoder = exynos_dpi_probe(dev);
745 if (IS_ERR(ctx->encoder)) {
746 ret = PTR_ERR(ctx->encoder);
747 goto err_iounmap;
748 }
749
750 pm_runtime_enable(dev);
751
752 ret = component_add(dev, &decon_component_ops);
753 if (ret)
754 goto err_disable_pm_runtime;
755
756 return ret;
757
758err_disable_pm_runtime:
759 pm_runtime_disable(dev);
760
761err_iounmap:
762 iounmap(ctx->regs);
763
764 return ret;
765}
766
767static int decon_remove(struct platform_device *pdev)
768{
769 struct decon_context *ctx = dev_get_drvdata(&pdev->dev);
770
771 pm_runtime_disable(&pdev->dev);
772
773 iounmap(ctx->regs);
774
775 component_del(&pdev->dev, &decon_component_ops);
776
777 return 0;
778}
779
780#ifdef CONFIG_PM
781static int exynos7_decon_suspend(struct device *dev)
782{
783 struct decon_context *ctx = dev_get_drvdata(dev);
784
785 clk_disable_unprepare(ctx->vclk);
786 clk_disable_unprepare(ctx->eclk);
787 clk_disable_unprepare(ctx->aclk);
788 clk_disable_unprepare(ctx->pclk);
789
790 return 0;
791}
792
793static int exynos7_decon_resume(struct device *dev)
794{
795 struct decon_context *ctx = dev_get_drvdata(dev);
796 int ret;
797
798 ret = clk_prepare_enable(ctx->pclk);
799 if (ret < 0) {
800 DRM_DEV_ERROR(dev, "Failed to prepare_enable the pclk [%d]\n",
801 ret);
802 return ret;
803 }
804
805 ret = clk_prepare_enable(ctx->aclk);
806 if (ret < 0) {
807 DRM_DEV_ERROR(dev, "Failed to prepare_enable the aclk [%d]\n",
808 ret);
809 return ret;
810 }
811
812 ret = clk_prepare_enable(ctx->eclk);
813 if (ret < 0) {
814 DRM_DEV_ERROR(dev, "Failed to prepare_enable the eclk [%d]\n",
815 ret);
816 return ret;
817 }
818
819 ret = clk_prepare_enable(ctx->vclk);
820 if (ret < 0) {
821 DRM_DEV_ERROR(dev, "Failed to prepare_enable the vclk [%d]\n",
822 ret);
823 return ret;
824 }
825
826 return 0;
827}
828#endif
829
830static const struct dev_pm_ops exynos7_decon_pm_ops = {
831 SET_RUNTIME_PM_OPS(exynos7_decon_suspend, exynos7_decon_resume,
832 NULL)
833 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
834 pm_runtime_force_resume)
835};
836
837struct platform_driver decon_driver = {
838 .probe = decon_probe,
839 .remove = decon_remove,
840 .driver = {
841 .name = "exynos-decon",
842 .pm = &exynos7_decon_pm_ops,
843 .of_match_table = decon_driver_dt_match,
844 },
845};
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* drivers/gpu/drm/exynos/exynos7_drm_decon.c
3 *
4 * Copyright (C) 2014 Samsung Electronics Co.Ltd
5 * Authors:
6 * Akshu Agarwal <akshua@gmail.com>
7 * Ajay Kumar <ajaykumar.rs@samsung.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/component.h>
12#include <linux/kernel.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/platform_device.h>
16#include <linux/pm_runtime.h>
17
18#include <video/of_display_timing.h>
19#include <video/of_videomode.h>
20
21#include <drm/drm_fourcc.h>
22#include <drm/drm_framebuffer.h>
23#include <drm/drm_vblank.h>
24#include <drm/exynos_drm.h>
25
26#include "exynos_drm_crtc.h"
27#include "exynos_drm_drv.h"
28#include "exynos_drm_fb.h"
29#include "exynos_drm_plane.h"
30#include "regs-decon7.h"
31
32/*
33 * DECON stands for Display and Enhancement controller.
34 */
35
36#define MIN_FB_WIDTH_FOR_16WORD_BURST 128
37
38#define WINDOWS_NR 2
39
40struct decon_context {
41 struct device *dev;
42 struct drm_device *drm_dev;
43 void *dma_priv;
44 struct exynos_drm_crtc *crtc;
45 struct exynos_drm_plane planes[WINDOWS_NR];
46 struct exynos_drm_plane_config configs[WINDOWS_NR];
47 struct clk *pclk;
48 struct clk *aclk;
49 struct clk *eclk;
50 struct clk *vclk;
51 void __iomem *regs;
52 unsigned long irq_flags;
53 bool i80_if;
54 bool suspended;
55 wait_queue_head_t wait_vsync_queue;
56 atomic_t wait_vsync_event;
57
58 struct drm_encoder *encoder;
59};
60
61static const struct of_device_id decon_driver_dt_match[] = {
62 {.compatible = "samsung,exynos7-decon"},
63 {},
64};
65MODULE_DEVICE_TABLE(of, decon_driver_dt_match);
66
67static const uint32_t decon_formats[] = {
68 DRM_FORMAT_RGB565,
69 DRM_FORMAT_XRGB8888,
70 DRM_FORMAT_XBGR8888,
71 DRM_FORMAT_RGBX8888,
72 DRM_FORMAT_BGRX8888,
73 DRM_FORMAT_ARGB8888,
74 DRM_FORMAT_ABGR8888,
75 DRM_FORMAT_RGBA8888,
76 DRM_FORMAT_BGRA8888,
77};
78
79static const enum drm_plane_type decon_win_types[WINDOWS_NR] = {
80 DRM_PLANE_TYPE_PRIMARY,
81 DRM_PLANE_TYPE_CURSOR,
82};
83
84static void decon_wait_for_vblank(struct exynos_drm_crtc *crtc)
85{
86 struct decon_context *ctx = crtc->ctx;
87
88 if (ctx->suspended)
89 return;
90
91 atomic_set(&ctx->wait_vsync_event, 1);
92
93 /*
94 * wait for DECON to signal VSYNC interrupt or return after
95 * timeout which is set to 50ms (refresh rate of 20).
96 */
97 if (!wait_event_timeout(ctx->wait_vsync_queue,
98 !atomic_read(&ctx->wait_vsync_event),
99 HZ/20))
100 DRM_DEV_DEBUG_KMS(ctx->dev, "vblank wait timed out.\n");
101}
102
103static void decon_clear_channels(struct exynos_drm_crtc *crtc)
104{
105 struct decon_context *ctx = crtc->ctx;
106 unsigned int win, ch_enabled = 0;
107
108 /* Check if any channel is enabled. */
109 for (win = 0; win < WINDOWS_NR; win++) {
110 u32 val = readl(ctx->regs + WINCON(win));
111
112 if (val & WINCONx_ENWIN) {
113 val &= ~WINCONx_ENWIN;
114 writel(val, ctx->regs + WINCON(win));
115 ch_enabled = 1;
116 }
117 }
118
119 /* Wait for vsync, as disable channel takes effect at next vsync */
120 if (ch_enabled)
121 decon_wait_for_vblank(ctx->crtc);
122}
123
124static int decon_ctx_initialize(struct decon_context *ctx,
125 struct drm_device *drm_dev)
126{
127 ctx->drm_dev = drm_dev;
128
129 decon_clear_channels(ctx->crtc);
130
131 return exynos_drm_register_dma(drm_dev, ctx->dev, &ctx->dma_priv);
132}
133
134static void decon_ctx_remove(struct decon_context *ctx)
135{
136 /* detach this sub driver from iommu mapping if supported. */
137 exynos_drm_unregister_dma(ctx->drm_dev, ctx->dev, &ctx->dma_priv);
138}
139
140static u32 decon_calc_clkdiv(struct decon_context *ctx,
141 const struct drm_display_mode *mode)
142{
143 unsigned long ideal_clk = mode->clock;
144 u32 clkdiv;
145
146 /* Find the clock divider value that gets us closest to ideal_clk */
147 clkdiv = DIV_ROUND_UP(clk_get_rate(ctx->vclk), ideal_clk);
148
149 return (clkdiv < 0x100) ? clkdiv : 0xff;
150}
151
152static void decon_commit(struct exynos_drm_crtc *crtc)
153{
154 struct decon_context *ctx = crtc->ctx;
155 struct drm_display_mode *mode = &crtc->base.state->adjusted_mode;
156 u32 val, clkdiv;
157
158 if (ctx->suspended)
159 return;
160
161 /* nothing to do if we haven't set the mode yet */
162 if (mode->htotal == 0 || mode->vtotal == 0)
163 return;
164
165 if (!ctx->i80_if) {
166 int vsync_len, vbpd, vfpd, hsync_len, hbpd, hfpd;
167 /* setup vertical timing values. */
168 vsync_len = mode->crtc_vsync_end - mode->crtc_vsync_start;
169 vbpd = mode->crtc_vtotal - mode->crtc_vsync_end;
170 vfpd = mode->crtc_vsync_start - mode->crtc_vdisplay;
171
172 val = VIDTCON0_VBPD(vbpd - 1) | VIDTCON0_VFPD(vfpd - 1);
173 writel(val, ctx->regs + VIDTCON0);
174
175 val = VIDTCON1_VSPW(vsync_len - 1);
176 writel(val, ctx->regs + VIDTCON1);
177
178 /* setup horizontal timing values. */
179 hsync_len = mode->crtc_hsync_end - mode->crtc_hsync_start;
180 hbpd = mode->crtc_htotal - mode->crtc_hsync_end;
181 hfpd = mode->crtc_hsync_start - mode->crtc_hdisplay;
182
183 /* setup horizontal timing values. */
184 val = VIDTCON2_HBPD(hbpd - 1) | VIDTCON2_HFPD(hfpd - 1);
185 writel(val, ctx->regs + VIDTCON2);
186
187 val = VIDTCON3_HSPW(hsync_len - 1);
188 writel(val, ctx->regs + VIDTCON3);
189 }
190
191 /* setup horizontal and vertical display size. */
192 val = VIDTCON4_LINEVAL(mode->vdisplay - 1) |
193 VIDTCON4_HOZVAL(mode->hdisplay - 1);
194 writel(val, ctx->regs + VIDTCON4);
195
196 writel(mode->vdisplay - 1, ctx->regs + LINECNT_OP_THRESHOLD);
197
198 /*
199 * fields of register with prefix '_F' would be updated
200 * at vsync(same as dma start)
201 */
202 val = VIDCON0_ENVID | VIDCON0_ENVID_F;
203 writel(val, ctx->regs + VIDCON0);
204
205 clkdiv = decon_calc_clkdiv(ctx, mode);
206 if (clkdiv > 1) {
207 val = VCLKCON1_CLKVAL_NUM_VCLK(clkdiv - 1);
208 writel(val, ctx->regs + VCLKCON1);
209 writel(val, ctx->regs + VCLKCON2);
210 }
211
212 val = readl(ctx->regs + DECON_UPDATE);
213 val |= DECON_UPDATE_STANDALONE_F;
214 writel(val, ctx->regs + DECON_UPDATE);
215}
216
217static int decon_enable_vblank(struct exynos_drm_crtc *crtc)
218{
219 struct decon_context *ctx = crtc->ctx;
220 u32 val;
221
222 if (ctx->suspended)
223 return -EPERM;
224
225 if (!test_and_set_bit(0, &ctx->irq_flags)) {
226 val = readl(ctx->regs + VIDINTCON0);
227
228 val |= VIDINTCON0_INT_ENABLE;
229
230 if (!ctx->i80_if) {
231 val |= VIDINTCON0_INT_FRAME;
232 val &= ~VIDINTCON0_FRAMESEL0_MASK;
233 val |= VIDINTCON0_FRAMESEL0_VSYNC;
234 }
235
236 writel(val, ctx->regs + VIDINTCON0);
237 }
238
239 return 0;
240}
241
242static void decon_disable_vblank(struct exynos_drm_crtc *crtc)
243{
244 struct decon_context *ctx = crtc->ctx;
245 u32 val;
246
247 if (ctx->suspended)
248 return;
249
250 if (test_and_clear_bit(0, &ctx->irq_flags)) {
251 val = readl(ctx->regs + VIDINTCON0);
252
253 val &= ~VIDINTCON0_INT_ENABLE;
254 if (!ctx->i80_if)
255 val &= ~VIDINTCON0_INT_FRAME;
256
257 writel(val, ctx->regs + VIDINTCON0);
258 }
259}
260
261static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win,
262 struct drm_framebuffer *fb)
263{
264 unsigned long val;
265 int padding;
266
267 val = readl(ctx->regs + WINCON(win));
268 val &= ~WINCONx_BPPMODE_MASK;
269
270 switch (fb->format->format) {
271 case DRM_FORMAT_RGB565:
272 val |= WINCONx_BPPMODE_16BPP_565;
273 val |= WINCONx_BURSTLEN_16WORD;
274 break;
275 case DRM_FORMAT_XRGB8888:
276 val |= WINCONx_BPPMODE_24BPP_xRGB;
277 val |= WINCONx_BURSTLEN_16WORD;
278 break;
279 case DRM_FORMAT_XBGR8888:
280 val |= WINCONx_BPPMODE_24BPP_xBGR;
281 val |= WINCONx_BURSTLEN_16WORD;
282 break;
283 case DRM_FORMAT_RGBX8888:
284 val |= WINCONx_BPPMODE_24BPP_RGBx;
285 val |= WINCONx_BURSTLEN_16WORD;
286 break;
287 case DRM_FORMAT_BGRX8888:
288 val |= WINCONx_BPPMODE_24BPP_BGRx;
289 val |= WINCONx_BURSTLEN_16WORD;
290 break;
291 case DRM_FORMAT_ARGB8888:
292 val |= WINCONx_BPPMODE_32BPP_ARGB | WINCONx_BLD_PIX |
293 WINCONx_ALPHA_SEL;
294 val |= WINCONx_BURSTLEN_16WORD;
295 break;
296 case DRM_FORMAT_ABGR8888:
297 val |= WINCONx_BPPMODE_32BPP_ABGR | WINCONx_BLD_PIX |
298 WINCONx_ALPHA_SEL;
299 val |= WINCONx_BURSTLEN_16WORD;
300 break;
301 case DRM_FORMAT_RGBA8888:
302 val |= WINCONx_BPPMODE_32BPP_RGBA | WINCONx_BLD_PIX |
303 WINCONx_ALPHA_SEL;
304 val |= WINCONx_BURSTLEN_16WORD;
305 break;
306 case DRM_FORMAT_BGRA8888:
307 default:
308 val |= WINCONx_BPPMODE_32BPP_BGRA | WINCONx_BLD_PIX |
309 WINCONx_ALPHA_SEL;
310 val |= WINCONx_BURSTLEN_16WORD;
311 break;
312 }
313
314 DRM_DEV_DEBUG_KMS(ctx->dev, "cpp = %d\n", fb->format->cpp[0]);
315
316 /*
317 * In case of exynos, setting dma-burst to 16Word causes permanent
318 * tearing for very small buffers, e.g. cursor buffer. Burst Mode
319 * switching which is based on plane size is not recommended as
320 * plane size varies a lot towards the end of the screen and rapid
321 * movement causes unstable DMA which results into iommu crash/tear.
322 */
323
324 padding = (fb->pitches[0] / fb->format->cpp[0]) - fb->width;
325 if (fb->width + padding < MIN_FB_WIDTH_FOR_16WORD_BURST) {
326 val &= ~WINCONx_BURSTLEN_MASK;
327 val |= WINCONx_BURSTLEN_8WORD;
328 }
329
330 writel(val, ctx->regs + WINCON(win));
331}
332
333static void decon_win_set_colkey(struct decon_context *ctx, unsigned int win)
334{
335 unsigned int keycon0 = 0, keycon1 = 0;
336
337 keycon0 = ~(WxKEYCON0_KEYBL_EN | WxKEYCON0_KEYEN_F |
338 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
339
340 keycon1 = WxKEYCON1_COLVAL(0xffffffff);
341
342 writel(keycon0, ctx->regs + WKEYCON0_BASE(win));
343 writel(keycon1, ctx->regs + WKEYCON1_BASE(win));
344}
345
346/**
347 * decon_shadow_protect_win() - disable updating values from shadow registers at vsync
348 *
349 * @ctx: display and enhancement controller context
350 * @win: window to protect registers for
351 * @protect: 1 to protect (disable updates)
352 */
353static void decon_shadow_protect_win(struct decon_context *ctx,
354 unsigned int win, bool protect)
355{
356 u32 bits, val;
357
358 bits = SHADOWCON_WINx_PROTECT(win);
359
360 val = readl(ctx->regs + SHADOWCON);
361 if (protect)
362 val |= bits;
363 else
364 val &= ~bits;
365 writel(val, ctx->regs + SHADOWCON);
366}
367
368static void decon_atomic_begin(struct exynos_drm_crtc *crtc)
369{
370 struct decon_context *ctx = crtc->ctx;
371 int i;
372
373 if (ctx->suspended)
374 return;
375
376 for (i = 0; i < WINDOWS_NR; i++)
377 decon_shadow_protect_win(ctx, i, true);
378}
379
380static void decon_update_plane(struct exynos_drm_crtc *crtc,
381 struct exynos_drm_plane *plane)
382{
383 struct exynos_drm_plane_state *state =
384 to_exynos_plane_state(plane->base.state);
385 struct decon_context *ctx = crtc->ctx;
386 struct drm_framebuffer *fb = state->base.fb;
387 int padding;
388 unsigned long val, alpha;
389 unsigned int last_x;
390 unsigned int last_y;
391 unsigned int win = plane->index;
392 unsigned int cpp = fb->format->cpp[0];
393 unsigned int pitch = fb->pitches[0];
394
395 if (ctx->suspended)
396 return;
397
398 /*
399 * SHADOWCON/PRTCON register is used for enabling timing.
400 *
401 * for example, once only width value of a register is set,
402 * if the dma is started then decon hardware could malfunction so
403 * with protect window setting, the register fields with prefix '_F'
404 * wouldn't be updated at vsync also but updated once unprotect window
405 * is set.
406 */
407
408 /* buffer start address */
409 val = (unsigned long)exynos_drm_fb_dma_addr(fb, 0);
410 writel(val, ctx->regs + VIDW_BUF_START(win));
411
412 padding = (pitch / cpp) - fb->width;
413
414 /* buffer size */
415 writel(fb->width + padding, ctx->regs + VIDW_WHOLE_X(win));
416 writel(fb->height, ctx->regs + VIDW_WHOLE_Y(win));
417
418 /* offset from the start of the buffer to read */
419 writel(state->src.x, ctx->regs + VIDW_OFFSET_X(win));
420 writel(state->src.y, ctx->regs + VIDW_OFFSET_Y(win));
421
422 DRM_DEV_DEBUG_KMS(ctx->dev, "start addr = 0x%lx\n",
423 (unsigned long)val);
424 DRM_DEV_DEBUG_KMS(ctx->dev, "ovl_width = %d, ovl_height = %d\n",
425 state->crtc.w, state->crtc.h);
426
427 val = VIDOSDxA_TOPLEFT_X(state->crtc.x) |
428 VIDOSDxA_TOPLEFT_Y(state->crtc.y);
429 writel(val, ctx->regs + VIDOSD_A(win));
430
431 last_x = state->crtc.x + state->crtc.w;
432 if (last_x)
433 last_x--;
434 last_y = state->crtc.y + state->crtc.h;
435 if (last_y)
436 last_y--;
437
438 val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y);
439
440 writel(val, ctx->regs + VIDOSD_B(win));
441
442 DRM_DEV_DEBUG_KMS(ctx->dev, "osd pos: tx = %d, ty = %d, bx = %d, by = %d\n",
443 state->crtc.x, state->crtc.y, last_x, last_y);
444
445 /* OSD alpha */
446 alpha = VIDOSDxC_ALPHA0_R_F(0x0) |
447 VIDOSDxC_ALPHA0_G_F(0x0) |
448 VIDOSDxC_ALPHA0_B_F(0x0);
449
450 writel(alpha, ctx->regs + VIDOSD_C(win));
451
452 alpha = VIDOSDxD_ALPHA1_R_F(0xff) |
453 VIDOSDxD_ALPHA1_G_F(0xff) |
454 VIDOSDxD_ALPHA1_B_F(0xff);
455
456 writel(alpha, ctx->regs + VIDOSD_D(win));
457
458 decon_win_set_pixfmt(ctx, win, fb);
459
460 /* hardware window 0 doesn't support color key. */
461 if (win != 0)
462 decon_win_set_colkey(ctx, win);
463
464 /* wincon */
465 val = readl(ctx->regs + WINCON(win));
466 val |= WINCONx_TRIPLE_BUF_MODE;
467 val |= WINCONx_ENWIN;
468 writel(val, ctx->regs + WINCON(win));
469
470 /* Enable DMA channel and unprotect windows */
471 decon_shadow_protect_win(ctx, win, false);
472
473 val = readl(ctx->regs + DECON_UPDATE);
474 val |= DECON_UPDATE_STANDALONE_F;
475 writel(val, ctx->regs + DECON_UPDATE);
476}
477
478static void decon_disable_plane(struct exynos_drm_crtc *crtc,
479 struct exynos_drm_plane *plane)
480{
481 struct decon_context *ctx = crtc->ctx;
482 unsigned int win = plane->index;
483 u32 val;
484
485 if (ctx->suspended)
486 return;
487
488 /* protect windows */
489 decon_shadow_protect_win(ctx, win, true);
490
491 /* wincon */
492 val = readl(ctx->regs + WINCON(win));
493 val &= ~WINCONx_ENWIN;
494 writel(val, ctx->regs + WINCON(win));
495
496 val = readl(ctx->regs + DECON_UPDATE);
497 val |= DECON_UPDATE_STANDALONE_F;
498 writel(val, ctx->regs + DECON_UPDATE);
499}
500
501static void decon_atomic_flush(struct exynos_drm_crtc *crtc)
502{
503 struct decon_context *ctx = crtc->ctx;
504 int i;
505
506 if (ctx->suspended)
507 return;
508
509 for (i = 0; i < WINDOWS_NR; i++)
510 decon_shadow_protect_win(ctx, i, false);
511 exynos_crtc_handle_event(crtc);
512}
513
514static void decon_init(struct decon_context *ctx)
515{
516 u32 val;
517
518 writel(VIDCON0_SWRESET, ctx->regs + VIDCON0);
519
520 val = VIDOUTCON0_DISP_IF_0_ON;
521 if (!ctx->i80_if)
522 val |= VIDOUTCON0_RGBIF;
523 writel(val, ctx->regs + VIDOUTCON0);
524
525 writel(VCLKCON0_CLKVALUP | VCLKCON0_VCLKFREE, ctx->regs + VCLKCON0);
526
527 if (!ctx->i80_if)
528 writel(VIDCON1_VCLK_HOLD, ctx->regs + VIDCON1(0));
529}
530
531static void decon_atomic_enable(struct exynos_drm_crtc *crtc)
532{
533 struct decon_context *ctx = crtc->ctx;
534 int ret;
535
536 if (!ctx->suspended)
537 return;
538
539 ret = pm_runtime_resume_and_get(ctx->dev);
540 if (ret < 0) {
541 DRM_DEV_ERROR(ctx->dev, "failed to enable DECON device.\n");
542 return;
543 }
544
545 decon_init(ctx);
546
547 /* if vblank was enabled status, enable it again. */
548 if (test_and_clear_bit(0, &ctx->irq_flags))
549 decon_enable_vblank(ctx->crtc);
550
551 decon_commit(ctx->crtc);
552
553 ctx->suspended = false;
554}
555
556static void decon_atomic_disable(struct exynos_drm_crtc *crtc)
557{
558 struct decon_context *ctx = crtc->ctx;
559 int i;
560
561 if (ctx->suspended)
562 return;
563
564 /*
565 * We need to make sure that all windows are disabled before we
566 * suspend that connector. Otherwise we might try to scan from
567 * a destroyed buffer later.
568 */
569 for (i = 0; i < WINDOWS_NR; i++)
570 decon_disable_plane(crtc, &ctx->planes[i]);
571
572 pm_runtime_put_sync(ctx->dev);
573
574 ctx->suspended = true;
575}
576
577static const struct exynos_drm_crtc_ops decon_crtc_ops = {
578 .atomic_enable = decon_atomic_enable,
579 .atomic_disable = decon_atomic_disable,
580 .enable_vblank = decon_enable_vblank,
581 .disable_vblank = decon_disable_vblank,
582 .atomic_begin = decon_atomic_begin,
583 .update_plane = decon_update_plane,
584 .disable_plane = decon_disable_plane,
585 .atomic_flush = decon_atomic_flush,
586};
587
588
589static irqreturn_t decon_irq_handler(int irq, void *dev_id)
590{
591 struct decon_context *ctx = (struct decon_context *)dev_id;
592 u32 val, clear_bit;
593
594 val = readl(ctx->regs + VIDINTCON1);
595
596 clear_bit = ctx->i80_if ? VIDINTCON1_INT_I80 : VIDINTCON1_INT_FRAME;
597 if (val & clear_bit)
598 writel(clear_bit, ctx->regs + VIDINTCON1);
599
600 /* check the crtc is detached already from encoder */
601 if (!ctx->drm_dev)
602 goto out;
603
604 if (!ctx->i80_if) {
605 drm_crtc_handle_vblank(&ctx->crtc->base);
606
607 /* set wait vsync event to zero and wake up queue. */
608 if (atomic_read(&ctx->wait_vsync_event)) {
609 atomic_set(&ctx->wait_vsync_event, 0);
610 wake_up(&ctx->wait_vsync_queue);
611 }
612 }
613out:
614 return IRQ_HANDLED;
615}
616
617static int decon_bind(struct device *dev, struct device *master, void *data)
618{
619 struct decon_context *ctx = dev_get_drvdata(dev);
620 struct drm_device *drm_dev = data;
621 struct exynos_drm_plane *exynos_plane;
622 unsigned int i;
623 int ret;
624
625 ret = decon_ctx_initialize(ctx, drm_dev);
626 if (ret) {
627 DRM_DEV_ERROR(dev, "decon_ctx_initialize failed.\n");
628 return ret;
629 }
630
631 for (i = 0; i < WINDOWS_NR; i++) {
632 ctx->configs[i].pixel_formats = decon_formats;
633 ctx->configs[i].num_pixel_formats = ARRAY_SIZE(decon_formats);
634 ctx->configs[i].zpos = i;
635 ctx->configs[i].type = decon_win_types[i];
636
637 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
638 &ctx->configs[i]);
639 if (ret)
640 return ret;
641 }
642
643 exynos_plane = &ctx->planes[DEFAULT_WIN];
644 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
645 EXYNOS_DISPLAY_TYPE_LCD, &decon_crtc_ops, ctx);
646 if (IS_ERR(ctx->crtc)) {
647 decon_ctx_remove(ctx);
648 return PTR_ERR(ctx->crtc);
649 }
650
651 if (ctx->encoder)
652 exynos_dpi_bind(drm_dev, ctx->encoder);
653
654 return 0;
655
656}
657
658static void decon_unbind(struct device *dev, struct device *master,
659 void *data)
660{
661 struct decon_context *ctx = dev_get_drvdata(dev);
662
663 decon_atomic_disable(ctx->crtc);
664
665 if (ctx->encoder)
666 exynos_dpi_remove(ctx->encoder);
667
668 decon_ctx_remove(ctx);
669}
670
671static const struct component_ops decon_component_ops = {
672 .bind = decon_bind,
673 .unbind = decon_unbind,
674};
675
676static int decon_probe(struct platform_device *pdev)
677{
678 struct device *dev = &pdev->dev;
679 struct decon_context *ctx;
680 struct device_node *i80_if_timings;
681 int ret;
682
683 if (!dev->of_node)
684 return -ENODEV;
685
686 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
687 if (!ctx)
688 return -ENOMEM;
689
690 ctx->dev = dev;
691 ctx->suspended = true;
692
693 i80_if_timings = of_get_child_by_name(dev->of_node, "i80-if-timings");
694 if (i80_if_timings)
695 ctx->i80_if = true;
696 of_node_put(i80_if_timings);
697
698 ctx->regs = of_iomap(dev->of_node, 0);
699 if (!ctx->regs)
700 return -ENOMEM;
701
702 ctx->pclk = devm_clk_get(dev, "pclk_decon0");
703 if (IS_ERR(ctx->pclk)) {
704 dev_err(dev, "failed to get bus clock pclk\n");
705 ret = PTR_ERR(ctx->pclk);
706 goto err_iounmap;
707 }
708
709 ctx->aclk = devm_clk_get(dev, "aclk_decon0");
710 if (IS_ERR(ctx->aclk)) {
711 dev_err(dev, "failed to get bus clock aclk\n");
712 ret = PTR_ERR(ctx->aclk);
713 goto err_iounmap;
714 }
715
716 ctx->eclk = devm_clk_get(dev, "decon0_eclk");
717 if (IS_ERR(ctx->eclk)) {
718 dev_err(dev, "failed to get eclock\n");
719 ret = PTR_ERR(ctx->eclk);
720 goto err_iounmap;
721 }
722
723 ctx->vclk = devm_clk_get(dev, "decon0_vclk");
724 if (IS_ERR(ctx->vclk)) {
725 dev_err(dev, "failed to get vclock\n");
726 ret = PTR_ERR(ctx->vclk);
727 goto err_iounmap;
728 }
729
730 ret = platform_get_irq_byname(pdev, ctx->i80_if ? "lcd_sys" : "vsync");
731 if (ret < 0)
732 goto err_iounmap;
733
734 ret = devm_request_irq(dev, ret, decon_irq_handler, 0, "drm_decon", ctx);
735 if (ret) {
736 dev_err(dev, "irq request failed.\n");
737 goto err_iounmap;
738 }
739
740 init_waitqueue_head(&ctx->wait_vsync_queue);
741 atomic_set(&ctx->wait_vsync_event, 0);
742
743 platform_set_drvdata(pdev, ctx);
744
745 ctx->encoder = exynos_dpi_probe(dev);
746 if (IS_ERR(ctx->encoder)) {
747 ret = PTR_ERR(ctx->encoder);
748 goto err_iounmap;
749 }
750
751 pm_runtime_enable(dev);
752
753 ret = component_add(dev, &decon_component_ops);
754 if (ret)
755 goto err_disable_pm_runtime;
756
757 return ret;
758
759err_disable_pm_runtime:
760 pm_runtime_disable(dev);
761
762err_iounmap:
763 iounmap(ctx->regs);
764
765 return ret;
766}
767
768static void decon_remove(struct platform_device *pdev)
769{
770 struct decon_context *ctx = dev_get_drvdata(&pdev->dev);
771
772 pm_runtime_disable(&pdev->dev);
773
774 iounmap(ctx->regs);
775
776 component_del(&pdev->dev, &decon_component_ops);
777}
778
779static int exynos7_decon_suspend(struct device *dev)
780{
781 struct decon_context *ctx = dev_get_drvdata(dev);
782
783 clk_disable_unprepare(ctx->vclk);
784 clk_disable_unprepare(ctx->eclk);
785 clk_disable_unprepare(ctx->aclk);
786 clk_disable_unprepare(ctx->pclk);
787
788 return 0;
789}
790
791static int exynos7_decon_resume(struct device *dev)
792{
793 struct decon_context *ctx = dev_get_drvdata(dev);
794 int ret;
795
796 ret = clk_prepare_enable(ctx->pclk);
797 if (ret < 0) {
798 DRM_DEV_ERROR(dev, "Failed to prepare_enable the pclk [%d]\n",
799 ret);
800 goto err_pclk_enable;
801 }
802
803 ret = clk_prepare_enable(ctx->aclk);
804 if (ret < 0) {
805 DRM_DEV_ERROR(dev, "Failed to prepare_enable the aclk [%d]\n",
806 ret);
807 goto err_aclk_enable;
808 }
809
810 ret = clk_prepare_enable(ctx->eclk);
811 if (ret < 0) {
812 DRM_DEV_ERROR(dev, "Failed to prepare_enable the eclk [%d]\n",
813 ret);
814 goto err_eclk_enable;
815 }
816
817 ret = clk_prepare_enable(ctx->vclk);
818 if (ret < 0) {
819 DRM_DEV_ERROR(dev, "Failed to prepare_enable the vclk [%d]\n",
820 ret);
821 goto err_vclk_enable;
822 }
823
824 return 0;
825
826err_vclk_enable:
827 clk_disable_unprepare(ctx->eclk);
828err_eclk_enable:
829 clk_disable_unprepare(ctx->aclk);
830err_aclk_enable:
831 clk_disable_unprepare(ctx->pclk);
832err_pclk_enable:
833 return ret;
834}
835
836static DEFINE_RUNTIME_DEV_PM_OPS(exynos7_decon_pm_ops, exynos7_decon_suspend,
837 exynos7_decon_resume, NULL);
838
839struct platform_driver decon_driver = {
840 .probe = decon_probe,
841 .remove_new = decon_remove,
842 .driver = {
843 .name = "exynos-decon",
844 .pm = pm_ptr(&exynos7_decon_pm_ops),
845 .of_match_table = decon_driver_dt_match,
846 },
847};