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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / gpu / drm / exynos / exynos7_drm_decon.c
blobff59c641fa809224b96972928c3b6ae6a5fb3c21
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
40 struct 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
60 static const struct of_device_id decon_driver_dt_match[] = {
61 {.compatible = "samsung,exynos7-decon"},
62 {},
63 };
64 MODULE_DEVICE_TABLE(of, decon_driver_dt_match);
65
66 static 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
78 static const enum drm_plane_type decon_win_types[WINDOWS_NR] = {
79 DRM_PLANE_TYPE_PRIMARY,
80 DRM_PLANE_TYPE_CURSOR,
81 };
82
83 static 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
102 static 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
123 static 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
133 static 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
139 static 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
151 static 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
216 static 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
241 static 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
260 static 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
332 static 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 */
351 static 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
366 static 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
378 static 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
476 static 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
499 static 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
512 static 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
529 static void decon_atomic_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
549 static void decon_atomic_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
570 static const struct exynos_drm_crtc_ops decon_crtc_ops = {
571 .atomic_enable = decon_atomic_enable,
572 .atomic_disable = decon_atomic_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
582 static 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 }
606 out:
607 return IRQ_HANDLED;
608 }
609
610 static 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
651 static 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_atomic_disable(ctx->crtc);
657
658 if (ctx->encoder)
659 exynos_dpi_remove(ctx->encoder);
660
661 decon_ctx_remove(ctx);
662 }
663
664 static const struct component_ops decon_component_ops = {
665 .bind = decon_bind,
666 .unbind = decon_unbind,
667 };
668
669 static 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
758 err_disable_pm_runtime:
759 pm_runtime_disable(dev);
760
761 err_iounmap:
762 iounmap(ctx->regs);
763
764 return ret;
765 }
766
767 static 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
781 static 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
793 static 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
830 static 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
837 struct 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 };
Linux with added FPC-III support