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 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 61 static const struct of_device_id decon_driver_dt_match[] = { 62 {.compatible = "samsung,exynos7-decon"}, 63 {}, 64 }; 65 MODULE_DEVICE_TABLE(of, decon_driver_dt_match); 66 67 static 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 79 static const enum drm_plane_type decon_win_types[WINDOWS_NR] = { 80 DRM_PLANE_TYPE_PRIMARY, 81 DRM_PLANE_TYPE_CURSOR, 82 }; 83 84 static 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 } 102 103 static 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 } 123 124 static 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 } 133 134 static 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 } 139 140 static 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 } 151 152 static 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 } 216 217 static 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 } 241 242 static 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 } 260 261 static 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 } 332 333 static 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 * shadow_protect_win() - disable updating values from shadow registers at vsync 348 * 349 * @win: window to protect registers for 350 * @protect: 1 to protect (disable updates) 351 */ 352 static void decon_shadow_protect_win(struct decon_context *ctx, 353 unsigned int win, bool protect) 354 { 355 u32 bits, val; 356 357 bits = SHADOWCON_WINx_PROTECT(win); 358 359 val = readl(ctx->regs + SHADOWCON); 360 if (protect) 361 val |= bits; 362 else 363 val &= ~bits; 364 writel(val, ctx->regs + SHADOWCON); 365 } 366 367 static void decon_atomic_begin(struct exynos_drm_crtc *crtc) 368 { 369 struct decon_context *ctx = crtc->ctx; 370 int i; 371 372 if (ctx->suspended) 373 return; 374 375 for (i = 0; i < WINDOWS_NR; i++) 376 decon_shadow_protect_win(ctx, i, true); 377 } 378 379 static void decon_update_plane(struct exynos_drm_crtc *crtc, 380 struct exynos_drm_plane *plane) 381 { 382 struct exynos_drm_plane_state *state = 383 to_exynos_plane_state(plane->base.state); 384 struct decon_context *ctx = crtc->ctx; 385 struct drm_framebuffer *fb = state->base.fb; 386 int padding; 387 unsigned long val, alpha; 388 unsigned int last_x; 389 unsigned int last_y; 390 unsigned int win = plane->index; 391 unsigned int cpp = fb->format->cpp[0]; 392 unsigned int pitch = fb->pitches[0]; 393 394 if (ctx->suspended) 395 return; 396 397 /* 398 * SHADOWCON/PRTCON register is used for enabling timing. 399 * 400 * for example, once only width value of a register is set, 401 * if the dma is started then decon hardware could malfunction so 402 * with protect window setting, the register fields with prefix '_F' 403 * wouldn't be updated at vsync also but updated once unprotect window 404 * is set. 405 */ 406 407 /* buffer start address */ 408 val = (unsigned long)exynos_drm_fb_dma_addr(fb, 0); 409 writel(val, ctx->regs + VIDW_BUF_START(win)); 410 411 padding = (pitch / cpp) - fb->width; 412 413 /* buffer size */ 414 writel(fb->width + padding, ctx->regs + VIDW_WHOLE_X(win)); 415 writel(fb->height, ctx->regs + VIDW_WHOLE_Y(win)); 416 417 /* offset from the start of the buffer to read */ 418 writel(state->src.x, ctx->regs + VIDW_OFFSET_X(win)); 419 writel(state->src.y, ctx->regs + VIDW_OFFSET_Y(win)); 420 421 DRM_DEV_DEBUG_KMS(ctx->dev, "start addr = 0x%lx\n", 422 (unsigned long)val); 423 DRM_DEV_DEBUG_KMS(ctx->dev, "ovl_width = %d, ovl_height = %d\n", 424 state->crtc.w, state->crtc.h); 425 426 val = VIDOSDxA_TOPLEFT_X(state->crtc.x) | 427 VIDOSDxA_TOPLEFT_Y(state->crtc.y); 428 writel(val, ctx->regs + VIDOSD_A(win)); 429 430 last_x = state->crtc.x + state->crtc.w; 431 if (last_x) 432 last_x--; 433 last_y = state->crtc.y + state->crtc.h; 434 if (last_y) 435 last_y--; 436 437 val = VIDOSDxB_BOTRIGHT_X(last_x) | VIDOSDxB_BOTRIGHT_Y(last_y); 438 439 writel(val, ctx->regs + VIDOSD_B(win)); 440 441 DRM_DEV_DEBUG_KMS(ctx->dev, "osd pos: tx = %d, ty = %d, bx = %d, by = %d\n", 442 state->crtc.x, state->crtc.y, last_x, last_y); 443 444 /* OSD alpha */ 445 alpha = VIDOSDxC_ALPHA0_R_F(0x0) | 446 VIDOSDxC_ALPHA0_G_F(0x0) | 447 VIDOSDxC_ALPHA0_B_F(0x0); 448 449 writel(alpha, ctx->regs + VIDOSD_C(win)); 450 451 alpha = VIDOSDxD_ALPHA1_R_F(0xff) | 452 VIDOSDxD_ALPHA1_G_F(0xff) | 453 VIDOSDxD_ALPHA1_B_F(0xff); 454 455 writel(alpha, ctx->regs + VIDOSD_D(win)); 456 457 decon_win_set_pixfmt(ctx, win, fb); 458 459 /* hardware window 0 doesn't support color key. */ 460 if (win != 0) 461 decon_win_set_colkey(ctx, win); 462 463 /* wincon */ 464 val = readl(ctx->regs + WINCON(win)); 465 val |= WINCONx_TRIPLE_BUF_MODE; 466 val |= WINCONx_ENWIN; 467 writel(val, ctx->regs + WINCON(win)); 468 469 /* Enable DMA channel and unprotect windows */ 470 decon_shadow_protect_win(ctx, win, false); 471 472 val = readl(ctx->regs + DECON_UPDATE); 473 val |= DECON_UPDATE_STANDALONE_F; 474 writel(val, ctx->regs + DECON_UPDATE); 475 } 476 477 static void decon_disable_plane(struct exynos_drm_crtc *crtc, 478 struct exynos_drm_plane *plane) 479 { 480 struct decon_context *ctx = crtc->ctx; 481 unsigned int win = plane->index; 482 u32 val; 483 484 if (ctx->suspended) 485 return; 486 487 /* protect windows */ 488 decon_shadow_protect_win(ctx, win, true); 489 490 /* wincon */ 491 val = readl(ctx->regs + WINCON(win)); 492 val &= ~WINCONx_ENWIN; 493 writel(val, ctx->regs + WINCON(win)); 494 495 val = readl(ctx->regs + DECON_UPDATE); 496 val |= DECON_UPDATE_STANDALONE_F; 497 writel(val, ctx->regs + DECON_UPDATE); 498 } 499 500 static void decon_atomic_flush(struct exynos_drm_crtc *crtc) 501 { 502 struct decon_context *ctx = crtc->ctx; 503 int i; 504 505 if (ctx->suspended) 506 return; 507 508 for (i = 0; i < WINDOWS_NR; i++) 509 decon_shadow_protect_win(ctx, i, false); 510 exynos_crtc_handle_event(crtc); 511 } 512 513 static void decon_init(struct decon_context *ctx) 514 { 515 u32 val; 516 517 writel(VIDCON0_SWRESET, ctx->regs + VIDCON0); 518 519 val = VIDOUTCON0_DISP_IF_0_ON; 520 if (!ctx->i80_if) 521 val |= VIDOUTCON0_RGBIF; 522 writel(val, ctx->regs + VIDOUTCON0); 523 524 writel(VCLKCON0_CLKVALUP | VCLKCON0_VCLKFREE, ctx->regs + VCLKCON0); 525 526 if (!ctx->i80_if) 527 writel(VIDCON1_VCLK_HOLD, ctx->regs + VIDCON1(0)); 528 } 529 530 static void decon_atomic_enable(struct exynos_drm_crtc *crtc) 531 { 532 struct decon_context *ctx = crtc->ctx; 533 534 if (!ctx->suspended) 535 return; 536 537 pm_runtime_get_sync(ctx->dev); 538 539 decon_init(ctx); 540 541 /* if vblank was enabled status, enable it again. */ 542 if (test_and_clear_bit(0, &ctx->irq_flags)) 543 decon_enable_vblank(ctx->crtc); 544 545 decon_commit(ctx->crtc); 546 547 ctx->suspended = false; 548 } 549 550 static void decon_atomic_disable(struct exynos_drm_crtc *crtc) 551 { 552 struct decon_context *ctx = crtc->ctx; 553 int i; 554 555 if (ctx->suspended) 556 return; 557 558 /* 559 * We need to make sure that all windows are disabled before we 560 * suspend that connector. Otherwise we might try to scan from 561 * a destroyed buffer later. 562 */ 563 for (i = 0; i < WINDOWS_NR; i++) 564 decon_disable_plane(crtc, &ctx->planes[i]); 565 566 pm_runtime_put_sync(ctx->dev); 567 568 ctx->suspended = true; 569 } 570 571 static const struct exynos_drm_crtc_ops decon_crtc_ops = { 572 .atomic_enable = decon_atomic_enable, 573 .atomic_disable = decon_atomic_disable, 574 .enable_vblank = decon_enable_vblank, 575 .disable_vblank = decon_disable_vblank, 576 .atomic_begin = decon_atomic_begin, 577 .update_plane = decon_update_plane, 578 .disable_plane = decon_disable_plane, 579 .atomic_flush = decon_atomic_flush, 580 }; 581 582 583 static irqreturn_t decon_irq_handler(int irq, void *dev_id) 584 { 585 struct decon_context *ctx = (struct decon_context *)dev_id; 586 u32 val, clear_bit; 587 588 val = readl(ctx->regs + VIDINTCON1); 589 590 clear_bit = ctx->i80_if ? VIDINTCON1_INT_I80 : VIDINTCON1_INT_FRAME; 591 if (val & clear_bit) 592 writel(clear_bit, ctx->regs + VIDINTCON1); 593 594 /* check the crtc is detached already from encoder */ 595 if (!ctx->drm_dev) 596 goto out; 597 598 if (!ctx->i80_if) { 599 drm_crtc_handle_vblank(&ctx->crtc->base); 600 601 /* set wait vsync event to zero and wake up queue. */ 602 if (atomic_read(&ctx->wait_vsync_event)) { 603 atomic_set(&ctx->wait_vsync_event, 0); 604 wake_up(&ctx->wait_vsync_queue); 605 } 606 } 607 out: 608 return IRQ_HANDLED; 609 } 610 611 static int decon_bind(struct device *dev, struct device *master, void *data) 612 { 613 struct decon_context *ctx = dev_get_drvdata(dev); 614 struct drm_device *drm_dev = data; 615 struct exynos_drm_plane *exynos_plane; 616 unsigned int i; 617 int ret; 618 619 ret = decon_ctx_initialize(ctx, drm_dev); 620 if (ret) { 621 DRM_DEV_ERROR(dev, "decon_ctx_initialize failed.\n"); 622 return ret; 623 } 624 625 for (i = 0; i < WINDOWS_NR; i++) { 626 ctx->configs[i].pixel_formats = decon_formats; 627 ctx->configs[i].num_pixel_formats = ARRAY_SIZE(decon_formats); 628 ctx->configs[i].zpos = i; 629 ctx->configs[i].type = decon_win_types[i]; 630 631 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i, 632 &ctx->configs[i]); 633 if (ret) 634 return ret; 635 } 636 637 exynos_plane = &ctx->planes[DEFAULT_WIN]; 638 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base, 639 EXYNOS_DISPLAY_TYPE_LCD, &decon_crtc_ops, ctx); 640 if (IS_ERR(ctx->crtc)) { 641 decon_ctx_remove(ctx); 642 return PTR_ERR(ctx->crtc); 643 } 644 645 if (ctx->encoder) 646 exynos_dpi_bind(drm_dev, ctx->encoder); 647 648 return 0; 649 650 } 651 652 static void decon_unbind(struct device *dev, struct device *master, 653 void *data) 654 { 655 struct decon_context *ctx = dev_get_drvdata(dev); 656 657 decon_atomic_disable(ctx->crtc); 658 659 if (ctx->encoder) 660 exynos_dpi_remove(ctx->encoder); 661 662 decon_ctx_remove(ctx); 663 } 664 665 static const struct component_ops decon_component_ops = { 666 .bind = decon_bind, 667 .unbind = decon_unbind, 668 }; 669 670 static int decon_probe(struct platform_device *pdev) 671 { 672 struct device *dev = &pdev->dev; 673 struct decon_context *ctx; 674 struct device_node *i80_if_timings; 675 struct resource *res; 676 int ret; 677 678 if (!dev->of_node) 679 return -ENODEV; 680 681 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 682 if (!ctx) 683 return -ENOMEM; 684 685 ctx->dev = dev; 686 ctx->suspended = true; 687 688 i80_if_timings = of_get_child_by_name(dev->of_node, "i80-if-timings"); 689 if (i80_if_timings) 690 ctx->i80_if = true; 691 of_node_put(i80_if_timings); 692 693 ctx->regs = of_iomap(dev->of_node, 0); 694 if (!ctx->regs) 695 return -ENOMEM; 696 697 ctx->pclk = devm_clk_get(dev, "pclk_decon0"); 698 if (IS_ERR(ctx->pclk)) { 699 dev_err(dev, "failed to get bus clock pclk\n"); 700 ret = PTR_ERR(ctx->pclk); 701 goto err_iounmap; 702 } 703 704 ctx->aclk = devm_clk_get(dev, "aclk_decon0"); 705 if (IS_ERR(ctx->aclk)) { 706 dev_err(dev, "failed to get bus clock aclk\n"); 707 ret = PTR_ERR(ctx->aclk); 708 goto err_iounmap; 709 } 710 711 ctx->eclk = devm_clk_get(dev, "decon0_eclk"); 712 if (IS_ERR(ctx->eclk)) { 713 dev_err(dev, "failed to get eclock\n"); 714 ret = PTR_ERR(ctx->eclk); 715 goto err_iounmap; 716 } 717 718 ctx->vclk = devm_clk_get(dev, "decon0_vclk"); 719 if (IS_ERR(ctx->vclk)) { 720 dev_err(dev, "failed to get vclock\n"); 721 ret = PTR_ERR(ctx->vclk); 722 goto err_iounmap; 723 } 724 725 res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, 726 ctx->i80_if ? "lcd_sys" : "vsync"); 727 if (!res) { 728 dev_err(dev, "irq request failed.\n"); 729 ret = -ENXIO; 730 goto err_iounmap; 731 } 732 733 ret = devm_request_irq(dev, res->start, decon_irq_handler, 734 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; 758 759 err_disable_pm_runtime: 760 pm_runtime_disable(dev); 761 762 err_iounmap: 763 iounmap(ctx->regs); 764 765 return ret; 766 } 767 768 static int 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 return 0; 779 } 780 781 #ifdef CONFIG_PM 782 static int exynos7_decon_suspend(struct device *dev) 783 { 784 struct decon_context *ctx = dev_get_drvdata(dev); 785 786 clk_disable_unprepare(ctx->vclk); 787 clk_disable_unprepare(ctx->eclk); 788 clk_disable_unprepare(ctx->aclk); 789 clk_disable_unprepare(ctx->pclk); 790 791 return 0; 792 } 793 794 static int exynos7_decon_resume(struct device *dev) 795 { 796 struct decon_context *ctx = dev_get_drvdata(dev); 797 int ret; 798 799 ret = clk_prepare_enable(ctx->pclk); 800 if (ret < 0) { 801 DRM_DEV_ERROR(dev, "Failed to prepare_enable the pclk [%d]\n", 802 ret); 803 return ret; 804 } 805 806 ret = clk_prepare_enable(ctx->aclk); 807 if (ret < 0) { 808 DRM_DEV_ERROR(dev, "Failed to prepare_enable the aclk [%d]\n", 809 ret); 810 return ret; 811 } 812 813 ret = clk_prepare_enable(ctx->eclk); 814 if (ret < 0) { 815 DRM_DEV_ERROR(dev, "Failed to prepare_enable the eclk [%d]\n", 816 ret); 817 return ret; 818 } 819 820 ret = clk_prepare_enable(ctx->vclk); 821 if (ret < 0) { 822 DRM_DEV_ERROR(dev, "Failed to prepare_enable the vclk [%d]\n", 823 ret); 824 return ret; 825 } 826 827 return 0; 828 } 829 #endif 830 831 static const struct dev_pm_ops exynos7_decon_pm_ops = { 832 SET_RUNTIME_PM_OPS(exynos7_decon_suspend, exynos7_decon_resume, 833 NULL) 834 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 835 pm_runtime_force_resume) 836 }; 837 838 struct platform_driver decon_driver = { 839 .probe = decon_probe, 840 .remove = decon_remove, 841 .driver = { 842 .name = "exynos-decon", 843 .pm = &exynos7_decon_pm_ops, 844 .of_match_table = decon_driver_dt_match, 845 }, 846 }; 847