1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2016 Marek Vasut <marex@denx.de> 4 * 5 * This code is based on drivers/video/fbdev/mxsfb.c : 6 * Copyright (C) 2010 Juergen Beisert, Pengutronix 7 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. 8 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved. 9 */ 10 11#include <linux/clk.h> 12#include <linux/io.h> 13#include <linux/iopoll.h> 14#include <linux/media-bus-format.h> 15#include <linux/pm_runtime.h> 16#include <linux/spinlock.h> 17 18#include <drm/drm_atomic.h> 19#include <drm/drm_atomic_helper.h> 20#include <drm/drm_bridge.h> 21#include <drm/drm_crtc.h> 22#include <drm/drm_encoder.h> 23#include <drm/drm_fb_dma_helper.h> 24#include <drm/drm_fourcc.h> 25#include <drm/drm_framebuffer.h> 26#include <drm/drm_gem_atomic_helper.h> 27#include <drm/drm_gem_dma_helper.h> 28#include <drm/drm_plane.h> 29#include <drm/drm_vblank.h> 30 31#include "mxsfb_drv.h" 32#include "mxsfb_regs.h" 33 34/* 1 second delay should be plenty of time for block reset */ 35#define RESET_TIMEOUT 1000000 36 37/* ----------------------------------------------------------------------------- 38 * CRTC 39 */ 40 41static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val) 42{ 43 return (val & mxsfb->devdata->hs_wdth_mask) << 44 mxsfb->devdata->hs_wdth_shift; 45} 46 47/* 48 * Setup the MXSFB registers for decoding the pixels out of the framebuffer and 49 * outputting them on the bus. 50 */ 51static void mxsfb_set_formats(struct mxsfb_drm_private *mxsfb, 52 const u32 bus_format) 53{ 54 struct drm_device *drm = mxsfb->drm; 55 const u32 format = mxsfb->crtc.primary->state->fb->format->format; 56 u32 ctrl, ctrl1; 57 58 DRM_DEV_DEBUG_DRIVER(drm->dev, "Using bus_format: 0x%08X\n", 59 bus_format); 60 61 ctrl = CTRL_BYPASS_COUNT | CTRL_MASTER; 62 63 /* CTRL1 contains IRQ config and status bits, preserve those. */ 64 ctrl1 = readl(mxsfb->base + LCDC_CTRL1); 65 ctrl1 &= CTRL1_CUR_FRAME_DONE_IRQ_EN | CTRL1_CUR_FRAME_DONE_IRQ; 66 67 switch (format) { 68 case DRM_FORMAT_RGB565: 69 dev_dbg(drm->dev, "Setting up RGB565 mode\n"); 70 ctrl |= CTRL_WORD_LENGTH_16; 71 ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0xf); 72 break; 73 case DRM_FORMAT_XRGB8888: 74 dev_dbg(drm->dev, "Setting up XRGB8888 mode\n"); 75 ctrl |= CTRL_WORD_LENGTH_24; 76 /* Do not use packed pixels = one pixel per word instead. */ 77 ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0x7); 78 break; 79 } 80 81 switch (bus_format) { 82 case MEDIA_BUS_FMT_RGB565_1X16: 83 ctrl |= CTRL_BUS_WIDTH_16; 84 break; 85 case MEDIA_BUS_FMT_RGB666_1X18: 86 ctrl |= CTRL_BUS_WIDTH_18; 87 break; 88 case MEDIA_BUS_FMT_RGB888_1X24: 89 ctrl |= CTRL_BUS_WIDTH_24; 90 break; 91 default: 92 dev_err(drm->dev, "Unknown media bus format 0x%x\n", bus_format); 93 break; 94 } 95 96 writel(ctrl1, mxsfb->base + LCDC_CTRL1); 97 writel(ctrl, mxsfb->base + LCDC_CTRL); 98} 99 100static void mxsfb_set_mode(struct mxsfb_drm_private *mxsfb, u32 bus_flags) 101{ 102 struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode; 103 u32 vdctrl0, vsync_pulse_len, hsync_pulse_len; 104 105 writel(TRANSFER_COUNT_SET_VCOUNT(m->crtc_vdisplay) | 106 TRANSFER_COUNT_SET_HCOUNT(m->crtc_hdisplay), 107 mxsfb->base + mxsfb->devdata->transfer_count); 108 109 vsync_pulse_len = m->crtc_vsync_end - m->crtc_vsync_start; 110 111 vdctrl0 = VDCTRL0_ENABLE_PRESENT | /* Always in DOTCLOCK mode */ 112 VDCTRL0_VSYNC_PERIOD_UNIT | 113 VDCTRL0_VSYNC_PULSE_WIDTH_UNIT | 114 VDCTRL0_SET_VSYNC_PULSE_WIDTH(vsync_pulse_len); 115 if (m->flags & DRM_MODE_FLAG_PHSYNC) 116 vdctrl0 |= VDCTRL0_HSYNC_ACT_HIGH; 117 if (m->flags & DRM_MODE_FLAG_PVSYNC) 118 vdctrl0 |= VDCTRL0_VSYNC_ACT_HIGH; 119 /* Make sure Data Enable is high active by default */ 120 if (!(bus_flags & DRM_BUS_FLAG_DE_LOW)) 121 vdctrl0 |= VDCTRL0_ENABLE_ACT_HIGH; 122 /* 123 * DRM_BUS_FLAG_PIXDATA_DRIVE_ defines are controller centric, 124 * controllers VDCTRL0_DOTCLK is display centric. 125 * Drive on positive edge -> display samples on falling edge 126 * DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE -> VDCTRL0_DOTCLK_ACT_FALLING 127 */ 128 if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE) 129 vdctrl0 |= VDCTRL0_DOTCLK_ACT_FALLING; 130 131 writel(vdctrl0, mxsfb->base + LCDC_VDCTRL0); 132 133 /* Frame length in lines. */ 134 writel(m->crtc_vtotal, mxsfb->base + LCDC_VDCTRL1); 135 136 /* Line length in units of clocks or pixels. */ 137 hsync_pulse_len = m->crtc_hsync_end - m->crtc_hsync_start; 138 writel(set_hsync_pulse_width(mxsfb, hsync_pulse_len) | 139 VDCTRL2_SET_HSYNC_PERIOD(m->crtc_htotal), 140 mxsfb->base + LCDC_VDCTRL2); 141 142 writel(SET_HOR_WAIT_CNT(m->crtc_htotal - m->crtc_hsync_start) | 143 SET_VERT_WAIT_CNT(m->crtc_vtotal - m->crtc_vsync_start), 144 mxsfb->base + LCDC_VDCTRL3); 145 146 writel(SET_DOTCLK_H_VALID_DATA_CNT(m->hdisplay), 147 mxsfb->base + LCDC_VDCTRL4); 148 149} 150 151static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb) 152{ 153 u32 reg; 154 155 if (mxsfb->clk_disp_axi) 156 clk_prepare_enable(mxsfb->clk_disp_axi); 157 clk_prepare_enable(mxsfb->clk); 158 159 /* Increase number of outstanding requests on all supported IPs */ 160 if (mxsfb->devdata->has_ctrl2) { 161 reg = readl(mxsfb->base + LCDC_V4_CTRL2); 162 reg &= ~CTRL2_SET_OUTSTANDING_REQS_MASK; 163 reg |= CTRL2_SET_OUTSTANDING_REQS_16; 164 writel(reg, mxsfb->base + LCDC_V4_CTRL2); 165 } 166 167 /* If it was disabled, re-enable the mode again */ 168 writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_SET); 169 170 /* Enable the SYNC signals first, then the DMA engine */ 171 reg = readl(mxsfb->base + LCDC_VDCTRL4); 172 reg |= VDCTRL4_SYNC_SIGNALS_ON; 173 writel(reg, mxsfb->base + LCDC_VDCTRL4); 174 175 /* 176 * Enable recovery on underflow. 177 * 178 * There is some sort of corner case behavior of the controller, 179 * which could rarely be triggered at least on i.MX6SX connected 180 * to 800x480 DPI panel and i.MX8MM connected to DPI->DSI->LVDS 181 * bridged 1920x1080 panel (and likely on other setups too), where 182 * the image on the panel shifts to the right and wraps around. 183 * This happens either when the controller is enabled on boot or 184 * even later during run time. The condition does not correct 185 * itself automatically, i.e. the display image remains shifted. 186 * 187 * It seems this problem is known and is due to sporadic underflows 188 * of the LCDIF FIFO. While the LCDIF IP does have underflow/overflow 189 * IRQs, neither of the IRQs trigger and neither IRQ status bit is 190 * asserted when this condition occurs. 191 * 192 * All known revisions of the LCDIF IP have CTRL1 RECOVER_ON_UNDERFLOW 193 * bit, which is described in the reference manual since i.MX23 as 194 * " 195 * Set this bit to enable the LCDIF block to recover in the next 196 * field/frame if there was an underflow in the current field/frame. 197 * " 198 * Enable this bit to mitigate the sporadic underflows. 199 */ 200 reg = readl(mxsfb->base + LCDC_CTRL1); 201 reg |= CTRL1_RECOVER_ON_UNDERFLOW; 202 writel(reg, mxsfb->base + LCDC_CTRL1); 203 204 writel(CTRL_RUN, mxsfb->base + LCDC_CTRL + REG_SET); 205} 206 207static void mxsfb_disable_controller(struct mxsfb_drm_private *mxsfb) 208{ 209 u32 reg; 210 211 /* 212 * Even if we disable the controller here, it will still continue 213 * until its FIFOs are running out of data 214 */ 215 writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_CLR); 216 217 readl_poll_timeout(mxsfb->base + LCDC_CTRL, reg, !(reg & CTRL_RUN), 218 0, 1000); 219 220 reg = readl(mxsfb->base + LCDC_VDCTRL4); 221 reg &= ~VDCTRL4_SYNC_SIGNALS_ON; 222 writel(reg, mxsfb->base + LCDC_VDCTRL4); 223 224 clk_disable_unprepare(mxsfb->clk); 225 if (mxsfb->clk_disp_axi) 226 clk_disable_unprepare(mxsfb->clk_disp_axi); 227} 228 229/* 230 * Clear the bit and poll it cleared. This is usually called with 231 * a reset address and mask being either SFTRST(bit 31) or CLKGATE 232 * (bit 30). 233 */ 234static int clear_poll_bit(void __iomem *addr, u32 mask) 235{ 236 u32 reg; 237 238 writel(mask, addr + REG_CLR); 239 return readl_poll_timeout(addr, reg, !(reg & mask), 0, RESET_TIMEOUT); 240} 241 242static int mxsfb_reset_block(struct mxsfb_drm_private *mxsfb) 243{ 244 int ret; 245 246 /* 247 * It seems, you can't re-program the controller if it is still 248 * running. This may lead to shifted pictures (FIFO issue?), so 249 * first stop the controller and drain its FIFOs. 250 */ 251 252 ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_SFTRST); 253 if (ret) 254 return ret; 255 256 writel(CTRL_CLKGATE, mxsfb->base + LCDC_CTRL + REG_CLR); 257 258 ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_SFTRST); 259 if (ret) 260 return ret; 261 262 ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, CTRL_CLKGATE); 263 if (ret) 264 return ret; 265 266 /* Clear the FIFOs */ 267 writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET); 268 readl(mxsfb->base + LCDC_CTRL1); 269 writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_CLR); 270 readl(mxsfb->base + LCDC_CTRL1); 271 272 if (mxsfb->devdata->has_overlay) 273 writel(0, mxsfb->base + LCDC_AS_CTRL); 274 275 return 0; 276} 277 278static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb, 279 struct drm_bridge_state *bridge_state, 280 const u32 bus_format) 281{ 282 struct drm_device *drm = mxsfb->crtc.dev; 283 struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode; 284 u32 bus_flags = mxsfb->connector->display_info.bus_flags; 285 int err; 286 287 if (mxsfb->bridge && mxsfb->bridge->timings) 288 bus_flags = mxsfb->bridge->timings->input_bus_flags; 289 else if (bridge_state) 290 bus_flags = bridge_state->input_bus_cfg.flags; 291 292 DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n", 293 m->crtc_clock, 294 (int)(clk_get_rate(mxsfb->clk) / 1000)); 295 DRM_DEV_DEBUG_DRIVER(drm->dev, "Connector bus_flags: 0x%08X\n", 296 bus_flags); 297 DRM_DEV_DEBUG_DRIVER(drm->dev, "Mode flags: 0x%08X\n", m->flags); 298 299 /* Mandatory eLCDIF reset as per the Reference Manual */ 300 err = mxsfb_reset_block(mxsfb); 301 if (err) 302 return; 303 304 mxsfb_set_formats(mxsfb, bus_format); 305 306 clk_set_rate(mxsfb->clk, m->crtc_clock * 1000); 307 308 mxsfb_set_mode(mxsfb, bus_flags); 309} 310 311static int mxsfb_crtc_atomic_check(struct drm_crtc *crtc, 312 struct drm_atomic_state *state) 313{ 314 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, 315 crtc); 316 bool has_primary = crtc_state->plane_mask & 317 drm_plane_mask(crtc->primary); 318 319 /* The primary plane has to be enabled when the CRTC is active. */ 320 if (crtc_state->active && !has_primary) 321 return -EINVAL; 322 323 /* TODO: Is this needed ? */ 324 return drm_atomic_add_affected_planes(state, crtc); 325} 326 327static void mxsfb_crtc_atomic_flush(struct drm_crtc *crtc, 328 struct drm_atomic_state *state) 329{ 330 struct drm_pending_vblank_event *event; 331 332 event = crtc->state->event; 333 crtc->state->event = NULL; 334 335 if (!event) 336 return; 337 338 spin_lock_irq(&crtc->dev->event_lock); 339 if (drm_crtc_vblank_get(crtc) == 0) 340 drm_crtc_arm_vblank_event(crtc, event); 341 else 342 drm_crtc_send_vblank_event(crtc, event); 343 spin_unlock_irq(&crtc->dev->event_lock); 344} 345 346static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc, 347 struct drm_atomic_state *state) 348{ 349 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); 350 struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state, 351 crtc->primary); 352 struct drm_bridge_state *bridge_state = NULL; 353 struct drm_device *drm = mxsfb->drm; 354 u32 bus_format = 0; 355 dma_addr_t dma_addr; 356 357 pm_runtime_get_sync(drm->dev); 358 mxsfb_enable_axi_clk(mxsfb); 359 360 drm_crtc_vblank_on(crtc); 361 362 /* If there is a bridge attached to the LCDIF, use its bus format */ 363 if (mxsfb->bridge) { 364 bridge_state = 365 drm_atomic_get_new_bridge_state(state, 366 mxsfb->bridge); 367 if (!bridge_state) 368 bus_format = MEDIA_BUS_FMT_FIXED; 369 else 370 bus_format = bridge_state->input_bus_cfg.format; 371 372 if (bus_format == MEDIA_BUS_FMT_FIXED) { 373 dev_warn_once(drm->dev, 374 "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n" 375 "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n"); 376 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 377 } 378 } 379 380 /* If there is no bridge, use bus format from connector */ 381 if (!bus_format && mxsfb->connector->display_info.num_bus_formats) 382 bus_format = mxsfb->connector->display_info.bus_formats[0]; 383 384 /* If all else fails, default to RGB888_1X24 */ 385 if (!bus_format) 386 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 387 388 mxsfb_crtc_mode_set_nofb(mxsfb, bridge_state, bus_format); 389 390 /* Write cur_buf as well to avoid an initial corrupt frame */ 391 dma_addr = drm_fb_dma_get_gem_addr(new_pstate->fb, new_pstate, 0); 392 if (dma_addr) { 393 writel(dma_addr, mxsfb->base + mxsfb->devdata->cur_buf); 394 writel(dma_addr, mxsfb->base + mxsfb->devdata->next_buf); 395 } 396 397 mxsfb_enable_controller(mxsfb); 398} 399 400static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc, 401 struct drm_atomic_state *state) 402{ 403 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); 404 struct drm_device *drm = mxsfb->drm; 405 struct drm_pending_vblank_event *event; 406 407 mxsfb_disable_controller(mxsfb); 408 409 spin_lock_irq(&drm->event_lock); 410 event = crtc->state->event; 411 if (event) { 412 crtc->state->event = NULL; 413 drm_crtc_send_vblank_event(crtc, event); 414 } 415 spin_unlock_irq(&drm->event_lock); 416 417 drm_crtc_vblank_off(crtc); 418 419 mxsfb_disable_axi_clk(mxsfb); 420 pm_runtime_put_sync(drm->dev); 421} 422 423static int mxsfb_crtc_enable_vblank(struct drm_crtc *crtc) 424{ 425 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); 426 427 /* Clear and enable VBLANK IRQ */ 428 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 429 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET); 430 431 return 0; 432} 433 434static void mxsfb_crtc_disable_vblank(struct drm_crtc *crtc) 435{ 436 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev); 437 438 /* Disable and clear VBLANK IRQ */ 439 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 440 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 441} 442 443static int mxsfb_crtc_set_crc_source(struct drm_crtc *crtc, const char *source) 444{ 445 struct mxsfb_drm_private *mxsfb; 446 447 if (!crtc) 448 return -ENODEV; 449 450 mxsfb = to_mxsfb_drm_private(crtc->dev); 451 452 if (source && strcmp(source, "auto") == 0) 453 mxsfb->crc_active = true; 454 else if (!source) 455 mxsfb->crc_active = false; 456 else 457 return -EINVAL; 458 459 return 0; 460} 461 462static int mxsfb_crtc_verify_crc_source(struct drm_crtc *crtc, 463 const char *source, size_t *values_cnt) 464{ 465 if (!crtc) 466 return -ENODEV; 467 468 if (source && strcmp(source, "auto") != 0) { 469 DRM_DEBUG_DRIVER("Unknown CRC source %s for %s\n", 470 source, crtc->name); 471 return -EINVAL; 472 } 473 474 *values_cnt = 1; 475 return 0; 476} 477 478static const struct drm_crtc_helper_funcs mxsfb_crtc_helper_funcs = { 479 .atomic_check = mxsfb_crtc_atomic_check, 480 .atomic_flush = mxsfb_crtc_atomic_flush, 481 .atomic_enable = mxsfb_crtc_atomic_enable, 482 .atomic_disable = mxsfb_crtc_atomic_disable, 483}; 484 485static const struct drm_crtc_funcs mxsfb_crtc_funcs = { 486 .reset = drm_atomic_helper_crtc_reset, 487 .destroy = drm_crtc_cleanup, 488 .set_config = drm_atomic_helper_set_config, 489 .page_flip = drm_atomic_helper_page_flip, 490 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 491 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 492 .enable_vblank = mxsfb_crtc_enable_vblank, 493 .disable_vblank = mxsfb_crtc_disable_vblank, 494}; 495 496static const struct drm_crtc_funcs mxsfb_crtc_with_crc_funcs = { 497 .reset = drm_atomic_helper_crtc_reset, 498 .destroy = drm_crtc_cleanup, 499 .set_config = drm_atomic_helper_set_config, 500 .page_flip = drm_atomic_helper_page_flip, 501 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 502 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 503 .enable_vblank = mxsfb_crtc_enable_vblank, 504 .disable_vblank = mxsfb_crtc_disable_vblank, 505 .set_crc_source = mxsfb_crtc_set_crc_source, 506 .verify_crc_source = mxsfb_crtc_verify_crc_source, 507}; 508 509/* ----------------------------------------------------------------------------- 510 * Encoder 511 */ 512 513static const struct drm_encoder_funcs mxsfb_encoder_funcs = { 514 .destroy = drm_encoder_cleanup, 515}; 516 517/* ----------------------------------------------------------------------------- 518 * Planes 519 */ 520 521static int mxsfb_plane_atomic_check(struct drm_plane *plane, 522 struct drm_atomic_state *state) 523{ 524 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, 525 plane); 526 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); 527 struct drm_crtc_state *crtc_state; 528 529 crtc_state = drm_atomic_get_new_crtc_state(state, 530 &mxsfb->crtc); 531 532 return drm_atomic_helper_check_plane_state(plane_state, crtc_state, 533 DRM_PLANE_NO_SCALING, 534 DRM_PLANE_NO_SCALING, 535 false, true); 536} 537 538static void mxsfb_plane_primary_atomic_update(struct drm_plane *plane, 539 struct drm_atomic_state *state) 540{ 541 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); 542 struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state, 543 plane); 544 dma_addr_t dma_addr; 545 546 dma_addr = drm_fb_dma_get_gem_addr(new_pstate->fb, new_pstate, 0); 547 if (dma_addr) 548 writel(dma_addr, mxsfb->base + mxsfb->devdata->next_buf); 549} 550 551static void mxsfb_plane_overlay_atomic_update(struct drm_plane *plane, 552 struct drm_atomic_state *state) 553{ 554 struct drm_plane_state *old_pstate = drm_atomic_get_old_plane_state(state, 555 plane); 556 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); 557 struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state, 558 plane); 559 dma_addr_t dma_addr; 560 u32 ctrl; 561 562 dma_addr = drm_fb_dma_get_gem_addr(new_pstate->fb, new_pstate, 0); 563 if (!dma_addr) { 564 writel(0, mxsfb->base + LCDC_AS_CTRL); 565 return; 566 } 567 568 /* 569 * HACK: The hardware seems to output 64 bytes of data of unknown 570 * origin, and then to proceed with the framebuffer. Until the reason 571 * is understood, live with the 16 initial invalid pixels on the first 572 * line and start 64 bytes within the framebuffer. 573 */ 574 dma_addr += 64; 575 576 writel(dma_addr, mxsfb->base + LCDC_AS_NEXT_BUF); 577 578 /* 579 * If the plane was previously disabled, write LCDC_AS_BUF as well to 580 * provide the first buffer. 581 */ 582 if (!old_pstate->fb) 583 writel(dma_addr, mxsfb->base + LCDC_AS_BUF); 584 585 ctrl = AS_CTRL_AS_ENABLE | AS_CTRL_ALPHA(255); 586 587 switch (new_pstate->fb->format->format) { 588 case DRM_FORMAT_XRGB4444: 589 ctrl |= AS_CTRL_FORMAT_RGB444 | AS_CTRL_ALPHA_CTRL_OVERRIDE; 590 break; 591 case DRM_FORMAT_ARGB4444: 592 ctrl |= AS_CTRL_FORMAT_ARGB4444 | AS_CTRL_ALPHA_CTRL_EMBEDDED; 593 break; 594 case DRM_FORMAT_XRGB1555: 595 ctrl |= AS_CTRL_FORMAT_RGB555 | AS_CTRL_ALPHA_CTRL_OVERRIDE; 596 break; 597 case DRM_FORMAT_ARGB1555: 598 ctrl |= AS_CTRL_FORMAT_ARGB1555 | AS_CTRL_ALPHA_CTRL_EMBEDDED; 599 break; 600 case DRM_FORMAT_RGB565: 601 ctrl |= AS_CTRL_FORMAT_RGB565 | AS_CTRL_ALPHA_CTRL_OVERRIDE; 602 break; 603 case DRM_FORMAT_XRGB8888: 604 ctrl |= AS_CTRL_FORMAT_RGB888 | AS_CTRL_ALPHA_CTRL_OVERRIDE; 605 break; 606 case DRM_FORMAT_ARGB8888: 607 ctrl |= AS_CTRL_FORMAT_ARGB8888 | AS_CTRL_ALPHA_CTRL_EMBEDDED; 608 break; 609 } 610 611 writel(ctrl, mxsfb->base + LCDC_AS_CTRL); 612} 613 614static void mxsfb_plane_overlay_atomic_disable(struct drm_plane *plane, 615 struct drm_atomic_state *state) 616{ 617 struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev); 618 619 writel(0, mxsfb->base + LCDC_AS_CTRL); 620} 621 622static bool mxsfb_format_mod_supported(struct drm_plane *plane, 623 uint32_t format, 624 uint64_t modifier) 625{ 626 return modifier == DRM_FORMAT_MOD_LINEAR; 627} 628 629static const struct drm_plane_helper_funcs mxsfb_plane_primary_helper_funcs = { 630 .atomic_check = mxsfb_plane_atomic_check, 631 .atomic_update = mxsfb_plane_primary_atomic_update, 632}; 633 634static const struct drm_plane_helper_funcs mxsfb_plane_overlay_helper_funcs = { 635 .atomic_check = mxsfb_plane_atomic_check, 636 .atomic_update = mxsfb_plane_overlay_atomic_update, 637 .atomic_disable = mxsfb_plane_overlay_atomic_disable, 638}; 639 640static const struct drm_plane_funcs mxsfb_plane_funcs = { 641 .format_mod_supported = mxsfb_format_mod_supported, 642 .update_plane = drm_atomic_helper_update_plane, 643 .disable_plane = drm_atomic_helper_disable_plane, 644 .destroy = drm_plane_cleanup, 645 .reset = drm_atomic_helper_plane_reset, 646 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, 647 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, 648}; 649 650static const uint32_t mxsfb_primary_plane_formats[] = { 651 DRM_FORMAT_RGB565, 652 DRM_FORMAT_XRGB8888, 653}; 654 655static const uint32_t mxsfb_overlay_plane_formats[] = { 656 DRM_FORMAT_XRGB4444, 657 DRM_FORMAT_ARGB4444, 658 DRM_FORMAT_XRGB1555, 659 DRM_FORMAT_ARGB1555, 660 DRM_FORMAT_RGB565, 661 DRM_FORMAT_XRGB8888, 662 DRM_FORMAT_ARGB8888, 663}; 664 665static const uint64_t mxsfb_modifiers[] = { 666 DRM_FORMAT_MOD_LINEAR, 667 DRM_FORMAT_MOD_INVALID 668}; 669 670/* ----------------------------------------------------------------------------- 671 * Initialization 672 */ 673 674int mxsfb_kms_init(struct mxsfb_drm_private *mxsfb) 675{ 676 struct drm_encoder *encoder = &mxsfb->encoder; 677 struct drm_crtc *crtc = &mxsfb->crtc; 678 int ret; 679 680 drm_plane_helper_add(&mxsfb->planes.primary, 681 &mxsfb_plane_primary_helper_funcs); 682 ret = drm_universal_plane_init(mxsfb->drm, &mxsfb->planes.primary, 1, 683 &mxsfb_plane_funcs, 684 mxsfb_primary_plane_formats, 685 ARRAY_SIZE(mxsfb_primary_plane_formats), 686 mxsfb_modifiers, DRM_PLANE_TYPE_PRIMARY, 687 NULL); 688 if (ret) 689 return ret; 690 691 if (mxsfb->devdata->has_overlay) { 692 drm_plane_helper_add(&mxsfb->planes.overlay, 693 &mxsfb_plane_overlay_helper_funcs); 694 ret = drm_universal_plane_init(mxsfb->drm, 695 &mxsfb->planes.overlay, 1, 696 &mxsfb_plane_funcs, 697 mxsfb_overlay_plane_formats, 698 ARRAY_SIZE(mxsfb_overlay_plane_formats), 699 mxsfb_modifiers, DRM_PLANE_TYPE_OVERLAY, 700 NULL); 701 if (ret) 702 return ret; 703 } 704 705 drm_crtc_helper_add(crtc, &mxsfb_crtc_helper_funcs); 706 if (mxsfb->devdata->has_crc32) { 707 ret = drm_crtc_init_with_planes(mxsfb->drm, crtc, 708 &mxsfb->planes.primary, NULL, 709 &mxsfb_crtc_with_crc_funcs, 710 NULL); 711 } else { 712 ret = drm_crtc_init_with_planes(mxsfb->drm, crtc, 713 &mxsfb->planes.primary, NULL, 714 &mxsfb_crtc_funcs, NULL); 715 } 716 if (ret) 717 return ret; 718 719 encoder->possible_crtcs = drm_crtc_mask(crtc); 720 return drm_encoder_init(mxsfb->drm, encoder, &mxsfb_encoder_funcs, 721 DRM_MODE_ENCODER_NONE, NULL); 722} 723