1 // SPDX-License-Identifier: GPL-2.0-only 2 // SPDX-FileCopyrightText: 2020 Marian Cichy <M.Cichy@pengutronix.de> 3 4 #include <drm/drm_bridge.h> 5 #include <drm/drm_bridge_connector.h> 6 #include <drm/drm_client_setup.h> 7 #include <drm/drm_damage_helper.h> 8 #include <drm/drm_drv.h> 9 #include <drm/drm_fbdev_dma.h> 10 #include <drm/drm_fb_dma_helper.h> 11 #include <drm/drm_fourcc.h> 12 #include <drm/drm_framebuffer.h> 13 #include <drm/drm_gem_atomic_helper.h> 14 #include <drm/drm_gem_dma_helper.h> 15 #include <drm/drm_gem_framebuffer_helper.h> 16 #include <drm/drm_of.h> 17 #include <drm/drm_probe_helper.h> 18 #include <drm/drm_simple_kms_helper.h> 19 #include <drm/drm_vblank.h> 20 #include <linux/bitfield.h> 21 #include <linux/clk.h> 22 #include <linux/dma-mapping.h> 23 #include <linux/mod_devicetable.h> 24 #include <linux/module.h> 25 #include <linux/platform_device.h> 26 27 #define IMX21LCDC_LSSAR 0x0000 /* LCDC Screen Start Address Register */ 28 #define IMX21LCDC_LSR 0x0004 /* LCDC Size Register */ 29 #define IMX21LCDC_LVPWR 0x0008 /* LCDC Virtual Page Width Register */ 30 #define IMX21LCDC_LCPR 0x000C /* LCDC Cursor Position Register */ 31 #define IMX21LCDC_LCWHB 0x0010 /* LCDC Cursor Width Height and Blink Register*/ 32 #define IMX21LCDC_LCCMR 0x0014 /* LCDC Color Cursor Mapping Register */ 33 #define IMX21LCDC_LPCR 0x0018 /* LCDC Panel Configuration Register */ 34 #define IMX21LCDC_LHCR 0x001C /* LCDC Horizontal Configuration Register */ 35 #define IMX21LCDC_LVCR 0x0020 /* LCDC Vertical Configuration Register */ 36 #define IMX21LCDC_LPOR 0x0024 /* LCDC Panning Offset Register */ 37 #define IMX21LCDC_LSCR 0x0028 /* LCDC Sharp Configuration Register */ 38 #define IMX21LCDC_LPCCR 0x002C /* LCDC PWM Contrast Control Register */ 39 #define IMX21LCDC_LDCR 0x0030 /* LCDC DMA Control Register */ 40 #define IMX21LCDC_LRMCR 0x0034 /* LCDC Refresh Mode Control Register */ 41 #define IMX21LCDC_LICR 0x0038 /* LCDC Interrupt Configuration Register */ 42 #define IMX21LCDC_LIER 0x003C /* LCDC Interrupt Enable Register */ 43 #define IMX21LCDC_LISR 0x0040 /* LCDC Interrupt Status Register */ 44 #define IMX21LCDC_LGWSAR 0x0050 /* LCDC Graphic Window Start Address Register */ 45 #define IMX21LCDC_LGWSR 0x0054 /* LCDC Graph Window Size Register */ 46 #define IMX21LCDC_LGWVPWR 0x0058 /* LCDC Graphic Window Virtual Page Width Register */ 47 #define IMX21LCDC_LGWPOR 0x005C /* LCDC Graphic Window Panning Offset Register */ 48 #define IMX21LCDC_LGWPR 0x0060 /* LCDC Graphic Window Position Register */ 49 #define IMX21LCDC_LGWCR 0x0064 /* LCDC Graphic Window Control Register */ 50 #define IMX21LCDC_LGWDCR 0x0068 /* LCDC Graphic Window DMA Control Register */ 51 #define IMX21LCDC_LAUSCR 0x0080 /* LCDC AUS Mode Control Register */ 52 #define IMX21LCDC_LAUSCCR 0x0084 /* LCDC AUS Mode Cursor Control Register */ 53 #define IMX21LCDC_BGLUT 0x0800 /* Background Lookup Table */ 54 #define IMX21LCDC_GWLUT 0x0C00 /* Graphic Window Lookup Table */ 55 56 #define IMX21LCDC_LCPR_CC0 BIT(30) /* Cursor Control Bit 0 */ 57 #define IMX21LCDC_LCPR_CC1 BIT(31) /* Cursor Control Bit 1 */ 58 59 /* Values HSYNC, VSYNC and Framesize Register */ 60 #define IMX21LCDC_LHCR_HWIDTH GENMASK(31, 26) 61 #define IMX21LCDC_LHCR_HFPORCH GENMASK(15, 8) /* H_WAIT_1 in the i.MX25 Reference manual */ 62 #define IMX21LCDC_LHCR_HBPORCH GENMASK(7, 0) /* H_WAIT_2 in the i.MX25 Reference manual */ 63 64 #define IMX21LCDC_LVCR_VWIDTH GENMASK(31, 26) 65 #define IMX21LCDC_LVCR_VFPORCH GENMASK(15, 8) /* V_WAIT_1 in the i.MX25 Reference manual */ 66 #define IMX21LCDC_LVCR_VBPORCH GENMASK(7, 0) /* V_WAIT_2 in the i.MX25 Reference manual */ 67 68 #define IMX21LCDC_LSR_XMAX GENMASK(25, 20) 69 #define IMX21LCDC_LSR_YMAX GENMASK(9, 0) 70 71 /* Values for LPCR Register */ 72 #define IMX21LCDC_LPCR_PCD GENMASK(5, 0) 73 #define IMX21LCDC_LPCR_SHARP BIT(6) 74 #define IMX21LCDC_LPCR_SCLKSEL BIT(7) 75 #define IMX21LCDC_LPCR_ACD GENMASK(14, 8) 76 #define IMX21LCDC_LPCR_ACDSEL BIT(15) 77 #define IMX21LCDC_LPCR_REV_VS BIT(16) 78 #define IMX21LCDC_LPCR_SWAP_SEL BIT(17) 79 #define IMX21LCDC_LPCR_END_SEL BIT(18) 80 #define IMX21LCDC_LPCR_SCLKIDLE BIT(19) 81 #define IMX21LCDC_LPCR_OEPOL BIT(20) 82 #define IMX21LCDC_LPCR_CLKPOL BIT(21) 83 #define IMX21LCDC_LPCR_LPPOL BIT(22) 84 #define IMX21LCDC_LPCR_FLMPOL BIT(23) 85 #define IMX21LCDC_LPCR_PIXPOL BIT(24) 86 #define IMX21LCDC_LPCR_BPIX GENMASK(27, 25) 87 #define IMX21LCDC_LPCR_PBSIZ GENMASK(29, 28) 88 #define IMX21LCDC_LPCR_COLOR BIT(30) 89 #define IMX21LCDC_LPCR_TFT BIT(31) 90 91 #define INTR_EOF BIT(1) /* VBLANK Interrupt Bit */ 92 93 #define BPP_RGB565 0x05 94 #define BPP_XRGB8888 0x07 95 96 #define LCDC_MIN_XRES 64 97 #define LCDC_MIN_YRES 64 98 99 #define LCDC_MAX_XRES 1024 100 #define LCDC_MAX_YRES 1024 101 102 struct imx_lcdc { 103 struct drm_device drm; 104 struct drm_simple_display_pipe pipe; 105 struct drm_connector *connector; 106 void __iomem *base; 107 108 struct clk *clk_ipg; 109 struct clk *clk_ahb; 110 struct clk *clk_per; 111 }; 112 113 static const u32 imx_lcdc_formats[] = { 114 DRM_FORMAT_RGB565, DRM_FORMAT_XRGB8888, 115 }; 116 117 static inline struct imx_lcdc *imx_lcdc_from_drmdev(struct drm_device *drm) 118 { 119 return container_of(drm, struct imx_lcdc, drm); 120 } 121 122 static unsigned int imx_lcdc_get_format(unsigned int drm_format) 123 { 124 switch (drm_format) { 125 default: 126 DRM_WARN("Format not supported - fallback to XRGB8888\n"); 127 fallthrough; 128 129 case DRM_FORMAT_XRGB8888: 130 return BPP_XRGB8888; 131 132 case DRM_FORMAT_RGB565: 133 return BPP_RGB565; 134 } 135 } 136 137 static void imx_lcdc_update_hw_registers(struct drm_simple_display_pipe *pipe, 138 struct drm_plane_state *old_state, 139 bool mode_set) 140 { 141 struct drm_crtc *crtc = &pipe->crtc; 142 struct drm_plane_state *new_state = pipe->plane.state; 143 struct drm_framebuffer *fb = new_state->fb; 144 struct imx_lcdc *lcdc = imx_lcdc_from_drmdev(pipe->crtc.dev); 145 u32 lpcr, lvcr, lhcr; 146 u32 framesize; 147 dma_addr_t addr; 148 149 addr = drm_fb_dma_get_gem_addr(fb, new_state, 0); 150 /* The LSSAR register specifies the LCD screen start address (SSA). */ 151 writel(addr, lcdc->base + IMX21LCDC_LSSAR); 152 153 if (!mode_set) 154 return; 155 156 /* Disable PER clock to make register write possible */ 157 if (old_state && old_state->crtc && old_state->crtc->enabled) 158 clk_disable_unprepare(lcdc->clk_per); 159 160 /* Framesize */ 161 framesize = FIELD_PREP(IMX21LCDC_LSR_XMAX, crtc->mode.hdisplay >> 4) | 162 FIELD_PREP(IMX21LCDC_LSR_YMAX, crtc->mode.vdisplay); 163 writel(framesize, lcdc->base + IMX21LCDC_LSR); 164 165 /* HSYNC */ 166 lhcr = FIELD_PREP(IMX21LCDC_LHCR_HFPORCH, crtc->mode.hsync_start - crtc->mode.hdisplay - 1) | 167 FIELD_PREP(IMX21LCDC_LHCR_HWIDTH, crtc->mode.hsync_end - crtc->mode.hsync_start - 1) | 168 FIELD_PREP(IMX21LCDC_LHCR_HBPORCH, crtc->mode.htotal - crtc->mode.hsync_end - 3); 169 writel(lhcr, lcdc->base + IMX21LCDC_LHCR); 170 171 /* VSYNC */ 172 lvcr = FIELD_PREP(IMX21LCDC_LVCR_VFPORCH, crtc->mode.vsync_start - crtc->mode.vdisplay) | 173 FIELD_PREP(IMX21LCDC_LVCR_VWIDTH, crtc->mode.vsync_end - crtc->mode.vsync_start) | 174 FIELD_PREP(IMX21LCDC_LVCR_VBPORCH, crtc->mode.vtotal - crtc->mode.vsync_end); 175 writel(lvcr, lcdc->base + IMX21LCDC_LVCR); 176 177 lpcr = readl(lcdc->base + IMX21LCDC_LPCR); 178 lpcr &= ~IMX21LCDC_LPCR_BPIX; 179 lpcr |= FIELD_PREP(IMX21LCDC_LPCR_BPIX, imx_lcdc_get_format(fb->format->format)); 180 writel(lpcr, lcdc->base + IMX21LCDC_LPCR); 181 182 /* Virtual Page Width */ 183 writel(new_state->fb->pitches[0] / 4, lcdc->base + IMX21LCDC_LVPWR); 184 185 /* Enable PER clock */ 186 if (new_state->crtc->enabled) 187 clk_prepare_enable(lcdc->clk_per); 188 } 189 190 static void imx_lcdc_pipe_enable(struct drm_simple_display_pipe *pipe, 191 struct drm_crtc_state *crtc_state, 192 struct drm_plane_state *plane_state) 193 { 194 int ret; 195 int clk_div; 196 int bpp; 197 struct imx_lcdc *lcdc = imx_lcdc_from_drmdev(pipe->crtc.dev); 198 struct drm_display_mode *mode = &pipe->crtc.mode; 199 struct drm_display_info *disp_info = &lcdc->connector->display_info; 200 const int hsync_pol = (mode->flags & DRM_MODE_FLAG_PHSYNC) ? 0 : 1; 201 const int vsync_pol = (mode->flags & DRM_MODE_FLAG_PVSYNC) ? 0 : 1; 202 const int data_enable_pol = 203 (disp_info->bus_flags & DRM_BUS_FLAG_DE_HIGH) ? 0 : 1; 204 const int clk_pol = 205 (disp_info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE) ? 0 : 1; 206 207 clk_div = DIV_ROUND_CLOSEST_ULL(clk_get_rate(lcdc->clk_per), 208 mode->clock * 1000); 209 bpp = imx_lcdc_get_format(plane_state->fb->format->format); 210 211 writel(FIELD_PREP(IMX21LCDC_LPCR_PCD, clk_div - 1) | 212 FIELD_PREP(IMX21LCDC_LPCR_LPPOL, hsync_pol) | 213 FIELD_PREP(IMX21LCDC_LPCR_FLMPOL, vsync_pol) | 214 FIELD_PREP(IMX21LCDC_LPCR_OEPOL, data_enable_pol) | 215 FIELD_PREP(IMX21LCDC_LPCR_TFT, 1) | 216 FIELD_PREP(IMX21LCDC_LPCR_COLOR, 1) | 217 FIELD_PREP(IMX21LCDC_LPCR_PBSIZ, 3) | 218 FIELD_PREP(IMX21LCDC_LPCR_BPIX, bpp) | 219 FIELD_PREP(IMX21LCDC_LPCR_SCLKSEL, 1) | 220 FIELD_PREP(IMX21LCDC_LPCR_PIXPOL, 0) | 221 FIELD_PREP(IMX21LCDC_LPCR_CLKPOL, clk_pol), 222 lcdc->base + IMX21LCDC_LPCR); 223 224 /* 0px panning offset */ 225 writel(0x00000000, lcdc->base + IMX21LCDC_LPOR); 226 227 /* disable hardware cursor */ 228 writel(readl(lcdc->base + IMX21LCDC_LCPR) & ~(IMX21LCDC_LCPR_CC0 | IMX21LCDC_LCPR_CC1), 229 lcdc->base + IMX21LCDC_LCPR); 230 231 ret = clk_prepare_enable(lcdc->clk_ipg); 232 if (ret) { 233 dev_err(pipe->crtc.dev->dev, "Cannot enable ipg clock: %pe\n", ERR_PTR(ret)); 234 return; 235 } 236 ret = clk_prepare_enable(lcdc->clk_ahb); 237 if (ret) { 238 dev_err(pipe->crtc.dev->dev, "Cannot enable ahb clock: %pe\n", ERR_PTR(ret)); 239 240 clk_disable_unprepare(lcdc->clk_ipg); 241 242 return; 243 } 244 245 imx_lcdc_update_hw_registers(pipe, NULL, true); 246 247 /* Enable VBLANK Interrupt */ 248 writel(INTR_EOF, lcdc->base + IMX21LCDC_LIER); 249 } 250 251 static void imx_lcdc_pipe_disable(struct drm_simple_display_pipe *pipe) 252 { 253 struct imx_lcdc *lcdc = imx_lcdc_from_drmdev(pipe->crtc.dev); 254 struct drm_crtc *crtc = &lcdc->pipe.crtc; 255 struct drm_pending_vblank_event *event; 256 257 clk_disable_unprepare(lcdc->clk_ahb); 258 clk_disable_unprepare(lcdc->clk_ipg); 259 260 if (pipe->crtc.enabled) 261 clk_disable_unprepare(lcdc->clk_per); 262 263 spin_lock_irq(&lcdc->drm.event_lock); 264 event = crtc->state->event; 265 if (event) { 266 crtc->state->event = NULL; 267 drm_crtc_send_vblank_event(crtc, event); 268 } 269 spin_unlock_irq(&lcdc->drm.event_lock); 270 271 /* Disable VBLANK Interrupt */ 272 writel(0, lcdc->base + IMX21LCDC_LIER); 273 } 274 275 static int imx_lcdc_pipe_check(struct drm_simple_display_pipe *pipe, 276 struct drm_plane_state *plane_state, 277 struct drm_crtc_state *crtc_state) 278 { 279 const struct drm_display_mode *mode = &crtc_state->mode; 280 const struct drm_display_mode *old_mode = &pipe->crtc.state->mode; 281 282 if (mode->hdisplay < LCDC_MIN_XRES || mode->hdisplay > LCDC_MAX_XRES || 283 mode->vdisplay < LCDC_MIN_YRES || mode->vdisplay > LCDC_MAX_YRES || 284 mode->hdisplay % 0x10) { /* must be multiple of 16 */ 285 drm_err(pipe->crtc.dev, "unsupported display mode (%u x %u)\n", 286 mode->hdisplay, mode->vdisplay); 287 return -EINVAL; 288 } 289 290 crtc_state->mode_changed = 291 old_mode->hdisplay != mode->hdisplay || 292 old_mode->vdisplay != mode->vdisplay; 293 294 return 0; 295 } 296 297 static void imx_lcdc_pipe_update(struct drm_simple_display_pipe *pipe, 298 struct drm_plane_state *old_state) 299 { 300 struct drm_crtc *crtc = &pipe->crtc; 301 struct drm_pending_vblank_event *event = crtc->state->event; 302 struct drm_plane_state *new_state = pipe->plane.state; 303 struct drm_framebuffer *fb = new_state->fb; 304 struct drm_framebuffer *old_fb = old_state->fb; 305 struct drm_crtc *old_crtc = old_state->crtc; 306 bool mode_changed = false; 307 308 if (old_fb && old_fb->format != fb->format) 309 mode_changed = true; 310 else if (old_crtc != crtc) 311 mode_changed = true; 312 313 imx_lcdc_update_hw_registers(pipe, old_state, mode_changed); 314 315 if (event) { 316 crtc->state->event = NULL; 317 318 spin_lock_irq(&crtc->dev->event_lock); 319 320 if (crtc->state->active && drm_crtc_vblank_get(crtc) == 0) 321 drm_crtc_arm_vblank_event(crtc, event); 322 else 323 drm_crtc_send_vblank_event(crtc, event); 324 325 spin_unlock_irq(&crtc->dev->event_lock); 326 } 327 } 328 329 static const struct drm_simple_display_pipe_funcs imx_lcdc_pipe_funcs = { 330 .enable = imx_lcdc_pipe_enable, 331 .disable = imx_lcdc_pipe_disable, 332 .check = imx_lcdc_pipe_check, 333 .update = imx_lcdc_pipe_update, 334 }; 335 336 static const struct drm_mode_config_funcs imx_lcdc_mode_config_funcs = { 337 .fb_create = drm_gem_fb_create_with_dirty, 338 .atomic_check = drm_atomic_helper_check, 339 .atomic_commit = drm_atomic_helper_commit, 340 }; 341 342 static const struct drm_mode_config_helper_funcs imx_lcdc_mode_config_helpers = { 343 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 344 }; 345 346 DEFINE_DRM_GEM_DMA_FOPS(imx_lcdc_drm_fops); 347 348 static struct drm_driver imx_lcdc_drm_driver = { 349 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 350 .fops = &imx_lcdc_drm_fops, 351 DRM_GEM_DMA_DRIVER_OPS_VMAP, 352 DRM_FBDEV_DMA_DRIVER_OPS, 353 .name = "imx-lcdc", 354 .desc = "i.MX LCDC driver", 355 .date = "20200716", 356 }; 357 358 static const struct of_device_id imx_lcdc_of_dev_id[] = { 359 { 360 .compatible = "fsl,imx21-lcdc", 361 }, 362 { 363 .compatible = "fsl,imx25-lcdc", 364 }, 365 { /* sentinel */ } 366 }; 367 MODULE_DEVICE_TABLE(of, imx_lcdc_of_dev_id); 368 369 static irqreturn_t imx_lcdc_irq_handler(int irq, void *arg) 370 { 371 struct imx_lcdc *lcdc = arg; 372 struct drm_crtc *crtc = &lcdc->pipe.crtc; 373 unsigned int status; 374 375 status = readl(lcdc->base + IMX21LCDC_LISR); 376 377 if (status & INTR_EOF) { 378 drm_crtc_handle_vblank(crtc); 379 return IRQ_HANDLED; 380 } 381 382 return IRQ_NONE; 383 } 384 385 static int imx_lcdc_probe(struct platform_device *pdev) 386 { 387 struct imx_lcdc *lcdc; 388 struct drm_device *drm; 389 struct drm_bridge *bridge; 390 int irq; 391 int ret; 392 struct device *dev = &pdev->dev; 393 394 lcdc = devm_drm_dev_alloc(dev, &imx_lcdc_drm_driver, 395 struct imx_lcdc, drm); 396 if (IS_ERR(lcdc)) 397 return PTR_ERR(lcdc); 398 399 drm = &lcdc->drm; 400 401 lcdc->base = devm_platform_ioremap_resource(pdev, 0); 402 if (IS_ERR(lcdc->base)) 403 return dev_err_probe(dev, PTR_ERR(lcdc->base), "Cannot get IO memory\n"); 404 405 bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, 0); 406 if (IS_ERR(bridge)) 407 return dev_err_probe(dev, PTR_ERR(bridge), "Failed to find bridge\n"); 408 409 /* Get Clocks */ 410 lcdc->clk_ipg = devm_clk_get(dev, "ipg"); 411 if (IS_ERR(lcdc->clk_ipg)) 412 return dev_err_probe(dev, PTR_ERR(lcdc->clk_ipg), "Failed to get %s clk\n", "ipg"); 413 414 lcdc->clk_ahb = devm_clk_get(dev, "ahb"); 415 if (IS_ERR(lcdc->clk_ahb)) 416 return dev_err_probe(dev, PTR_ERR(lcdc->clk_ahb), "Failed to get %s clk\n", "ahb"); 417 418 lcdc->clk_per = devm_clk_get(dev, "per"); 419 if (IS_ERR(lcdc->clk_per)) 420 return dev_err_probe(dev, PTR_ERR(lcdc->clk_per), "Failed to get %s clk\n", "per"); 421 422 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 423 if (ret) 424 return dev_err_probe(dev, ret, "Cannot set DMA Mask\n"); 425 426 /* Modeset init */ 427 ret = drmm_mode_config_init(drm); 428 if (ret) 429 return dev_err_probe(dev, ret, "Cannot initialize mode configuration structure\n"); 430 431 /* CRTC, Plane, Encoder */ 432 ret = drm_simple_display_pipe_init(drm, &lcdc->pipe, 433 &imx_lcdc_pipe_funcs, 434 imx_lcdc_formats, 435 ARRAY_SIZE(imx_lcdc_formats), NULL, NULL); 436 if (ret < 0) 437 return dev_err_probe(drm->dev, ret, "Cannot setup simple display pipe\n"); 438 439 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 440 if (ret < 0) 441 return dev_err_probe(drm->dev, ret, "Failed to initialize vblank\n"); 442 443 ret = drm_bridge_attach(&lcdc->pipe.encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR); 444 if (ret) 445 return dev_err_probe(drm->dev, ret, "Cannot attach bridge\n"); 446 447 lcdc->connector = drm_bridge_connector_init(drm, &lcdc->pipe.encoder); 448 if (IS_ERR(lcdc->connector)) 449 return dev_err_probe(drm->dev, PTR_ERR(lcdc->connector), "Cannot init bridge connector\n"); 450 451 drm_connector_attach_encoder(lcdc->connector, &lcdc->pipe.encoder); 452 453 /* 454 * The LCDC controller does not have an enable bit. The 455 * controller starts directly when the clocks are enabled. 456 * If the clocks are enabled when the controller is not yet 457 * programmed with proper register values (enabled at the 458 * bootloader, for example) then it just goes into some undefined 459 * state. 460 * To avoid this issue, let's enable and disable LCDC IPG, 461 * PER and AHB clock so that we force some kind of 'reset' 462 * to the LCDC block. 463 */ 464 465 ret = clk_prepare_enable(lcdc->clk_ipg); 466 if (ret) 467 return dev_err_probe(dev, ret, "Cannot enable ipg clock\n"); 468 clk_disable_unprepare(lcdc->clk_ipg); 469 470 ret = clk_prepare_enable(lcdc->clk_per); 471 if (ret) 472 return dev_err_probe(dev, ret, "Cannot enable per clock\n"); 473 clk_disable_unprepare(lcdc->clk_per); 474 475 ret = clk_prepare_enable(lcdc->clk_ahb); 476 if (ret) 477 return dev_err_probe(dev, ret, "Cannot enable ahb clock\n"); 478 clk_disable_unprepare(lcdc->clk_ahb); 479 480 drm->mode_config.min_width = LCDC_MIN_XRES; 481 drm->mode_config.max_width = LCDC_MAX_XRES; 482 drm->mode_config.min_height = LCDC_MIN_YRES; 483 drm->mode_config.max_height = LCDC_MAX_YRES; 484 drm->mode_config.preferred_depth = 16; 485 drm->mode_config.funcs = &imx_lcdc_mode_config_funcs; 486 drm->mode_config.helper_private = &imx_lcdc_mode_config_helpers; 487 488 drm_mode_config_reset(drm); 489 490 irq = platform_get_irq(pdev, 0); 491 if (irq < 0) { 492 ret = irq; 493 return ret; 494 } 495 496 ret = devm_request_irq(dev, irq, imx_lcdc_irq_handler, 0, "imx-lcdc", lcdc); 497 if (ret < 0) 498 return dev_err_probe(drm->dev, ret, "Failed to install IRQ handler\n"); 499 500 platform_set_drvdata(pdev, drm); 501 502 ret = drm_dev_register(&lcdc->drm, 0); 503 if (ret) 504 return dev_err_probe(dev, ret, "Cannot register device\n"); 505 506 drm_client_setup(drm, NULL); 507 508 return 0; 509 } 510 511 static void imx_lcdc_remove(struct platform_device *pdev) 512 { 513 struct drm_device *drm = platform_get_drvdata(pdev); 514 515 drm_dev_unregister(drm); 516 drm_atomic_helper_shutdown(drm); 517 } 518 519 static void imx_lcdc_shutdown(struct platform_device *pdev) 520 { 521 drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); 522 } 523 524 static struct platform_driver imx_lcdc_driver = { 525 .driver = { 526 .name = "imx-lcdc", 527 .of_match_table = imx_lcdc_of_dev_id, 528 }, 529 .probe = imx_lcdc_probe, 530 .remove_new = imx_lcdc_remove, 531 .shutdown = imx_lcdc_shutdown, 532 }; 533 module_platform_driver(imx_lcdc_driver); 534 535 MODULE_AUTHOR("Marian Cichy <M.Cichy@pengutronix.de>"); 536 MODULE_DESCRIPTION("Freescale i.MX LCDC driver"); 537 MODULE_LICENSE("GPL"); 538