1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics SA 2017 4 * 5 * Authors: Philippe Cornu <philippe.cornu@st.com> 6 * Yannick Fertre <yannick.fertre@st.com> 7 * Fabien Dessenne <fabien.dessenne@st.com> 8 * Mickael Reulier <mickael.reulier@st.com> 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/component.h> 13 #include <linux/delay.h> 14 #include <linux/interrupt.h> 15 #include <linux/module.h> 16 #include <linux/of_address.h> 17 #include <linux/of_graph.h> 18 #include <linux/pinctrl/consumer.h> 19 #include <linux/platform_device.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/reset.h> 22 23 #include <drm/drm_atomic.h> 24 #include <drm/drm_atomic_helper.h> 25 #include <drm/drm_bridge.h> 26 #include <drm/drm_device.h> 27 #include <drm/drm_fb_cma_helper.h> 28 #include <drm/drm_fourcc.h> 29 #include <drm/drm_gem_cma_helper.h> 30 #include <drm/drm_gem_framebuffer_helper.h> 31 #include <drm/drm_of.h> 32 #include <drm/drm_plane_helper.h> 33 #include <drm/drm_probe_helper.h> 34 #include <drm/drm_vblank.h> 35 36 #include <video/videomode.h> 37 38 #include "ltdc.h" 39 40 #define NB_CRTC 1 41 #define CRTC_MASK GENMASK(NB_CRTC - 1, 0) 42 43 #define MAX_IRQ 4 44 45 #define MAX_ENDPOINTS 2 46 47 #define HWVER_10200 0x010200 48 #define HWVER_10300 0x010300 49 #define HWVER_20101 0x020101 50 51 /* 52 * The address of some registers depends on the HW version: such registers have 53 * an extra offset specified with reg_ofs. 54 */ 55 #define REG_OFS_NONE 0 56 #define REG_OFS_4 4 /* Insertion of "Layer Conf. 2" reg */ 57 #define REG_OFS (ldev->caps.reg_ofs) 58 #define LAY_OFS 0x80 /* Register Offset between 2 layers */ 59 60 /* Global register offsets */ 61 #define LTDC_IDR 0x0000 /* IDentification */ 62 #define LTDC_LCR 0x0004 /* Layer Count */ 63 #define LTDC_SSCR 0x0008 /* Synchronization Size Configuration */ 64 #define LTDC_BPCR 0x000C /* Back Porch Configuration */ 65 #define LTDC_AWCR 0x0010 /* Active Width Configuration */ 66 #define LTDC_TWCR 0x0014 /* Total Width Configuration */ 67 #define LTDC_GCR 0x0018 /* Global Control */ 68 #define LTDC_GC1R 0x001C /* Global Configuration 1 */ 69 #define LTDC_GC2R 0x0020 /* Global Configuration 2 */ 70 #define LTDC_SRCR 0x0024 /* Shadow Reload Configuration */ 71 #define LTDC_GACR 0x0028 /* GAmma Correction */ 72 #define LTDC_BCCR 0x002C /* Background Color Configuration */ 73 #define LTDC_IER 0x0034 /* Interrupt Enable */ 74 #define LTDC_ISR 0x0038 /* Interrupt Status */ 75 #define LTDC_ICR 0x003C /* Interrupt Clear */ 76 #define LTDC_LIPCR 0x0040 /* Line Interrupt Position Conf. */ 77 #define LTDC_CPSR 0x0044 /* Current Position Status */ 78 #define LTDC_CDSR 0x0048 /* Current Display Status */ 79 80 /* Layer register offsets */ 81 #define LTDC_L1LC1R (0x80) /* L1 Layer Configuration 1 */ 82 #define LTDC_L1LC2R (0x84) /* L1 Layer Configuration 2 */ 83 #define LTDC_L1CR (0x84 + REG_OFS)/* L1 Control */ 84 #define LTDC_L1WHPCR (0x88 + REG_OFS)/* L1 Window Hor Position Config */ 85 #define LTDC_L1WVPCR (0x8C + REG_OFS)/* L1 Window Vert Position Config */ 86 #define LTDC_L1CKCR (0x90 + REG_OFS)/* L1 Color Keying Configuration */ 87 #define LTDC_L1PFCR (0x94 + REG_OFS)/* L1 Pixel Format Configuration */ 88 #define LTDC_L1CACR (0x98 + REG_OFS)/* L1 Constant Alpha Config */ 89 #define LTDC_L1DCCR (0x9C + REG_OFS)/* L1 Default Color Configuration */ 90 #define LTDC_L1BFCR (0xA0 + REG_OFS)/* L1 Blend Factors Configuration */ 91 #define LTDC_L1FBBCR (0xA4 + REG_OFS)/* L1 FrameBuffer Bus Control */ 92 #define LTDC_L1AFBCR (0xA8 + REG_OFS)/* L1 AuxFB Control */ 93 #define LTDC_L1CFBAR (0xAC + REG_OFS)/* L1 Color FrameBuffer Address */ 94 #define LTDC_L1CFBLR (0xB0 + REG_OFS)/* L1 Color FrameBuffer Length */ 95 #define LTDC_L1CFBLNR (0xB4 + REG_OFS)/* L1 Color FrameBuffer Line Nb */ 96 #define LTDC_L1AFBAR (0xB8 + REG_OFS)/* L1 AuxFB Address */ 97 #define LTDC_L1AFBLR (0xBC + REG_OFS)/* L1 AuxFB Length */ 98 #define LTDC_L1AFBLNR (0xC0 + REG_OFS)/* L1 AuxFB Line Number */ 99 #define LTDC_L1CLUTWR (0xC4 + REG_OFS)/* L1 CLUT Write */ 100 #define LTDC_L1YS1R (0xE0 + REG_OFS)/* L1 YCbCr Scale 1 */ 101 #define LTDC_L1YS2R (0xE4 + REG_OFS)/* L1 YCbCr Scale 2 */ 102 103 /* Bit definitions */ 104 #define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */ 105 #define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */ 106 107 #define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */ 108 #define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */ 109 110 #define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */ 111 #define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */ 112 113 #define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */ 114 #define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */ 115 116 #define GCR_LTDCEN BIT(0) /* LTDC ENable */ 117 #define GCR_DEN BIT(16) /* Dither ENable */ 118 #define GCR_PCPOL BIT(28) /* Pixel Clock POLarity-Inverted */ 119 #define GCR_DEPOL BIT(29) /* Data Enable POLarity-High */ 120 #define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity-High */ 121 #define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity-High */ 122 123 #define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */ 124 #define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */ 125 #define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */ 126 #define GC1R_PBEN BIT(12) /* Precise Blending ENable */ 127 #define GC1R_DT GENMASK(15, 14) /* Dithering Technique */ 128 #define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */ 129 #define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */ 130 #define GC1R_BCP BIT(22) /* Background Colour Programmable */ 131 #define GC1R_BBEN BIT(23) /* Background Blending ENabled */ 132 #define GC1R_LNIP BIT(24) /* Line Number IRQ Position */ 133 #define GC1R_TP BIT(25) /* Timing Programmable */ 134 #define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */ 135 #define GC1R_SPP BIT(27) /* Sync Polarity Programmable */ 136 #define GC1R_DWP BIT(28) /* Dither Width Programmable */ 137 #define GC1R_STREN BIT(29) /* STatus Registers ENabled */ 138 #define GC1R_BMEN BIT(31) /* Blind Mode ENabled */ 139 140 #define GC2R_EDCA BIT(0) /* External Display Control Ability */ 141 #define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */ 142 #define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */ 143 #define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */ 144 #define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */ 145 #define GC2R_EDCEN BIT(7) /* External Display Control ENabled */ 146 147 #define SRCR_IMR BIT(0) /* IMmediate Reload */ 148 #define SRCR_VBR BIT(1) /* Vertical Blanking Reload */ 149 150 #define BCCR_BCBLACK 0x00 /* Background Color BLACK */ 151 #define BCCR_BCBLUE GENMASK(7, 0) /* Background Color BLUE */ 152 #define BCCR_BCGREEN GENMASK(15, 8) /* Background Color GREEN */ 153 #define BCCR_BCRED GENMASK(23, 16) /* Background Color RED */ 154 #define BCCR_BCWHITE GENMASK(23, 0) /* Background Color WHITE */ 155 156 #define IER_LIE BIT(0) /* Line Interrupt Enable */ 157 #define IER_FUIE BIT(1) /* Fifo Underrun Interrupt Enable */ 158 #define IER_TERRIE BIT(2) /* Transfer ERRor Interrupt Enable */ 159 #define IER_RRIE BIT(3) /* Register Reload Interrupt enable */ 160 161 #define CPSR_CYPOS GENMASK(15, 0) /* Current Y position */ 162 163 #define ISR_LIF BIT(0) /* Line Interrupt Flag */ 164 #define ISR_FUIF BIT(1) /* Fifo Underrun Interrupt Flag */ 165 #define ISR_TERRIF BIT(2) /* Transfer ERRor Interrupt Flag */ 166 #define ISR_RRIF BIT(3) /* Register Reload Interrupt Flag */ 167 168 #define LXCR_LEN BIT(0) /* Layer ENable */ 169 #define LXCR_COLKEN BIT(1) /* Color Keying Enable */ 170 #define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */ 171 172 #define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */ 173 #define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */ 174 175 #define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */ 176 #define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */ 177 178 #define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */ 179 180 #define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */ 181 182 #define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */ 183 #define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */ 184 185 #define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */ 186 #define LXCFBLR_CFBP GENMASK(28, 16) /* Color Frame Buffer Pitch in bytes */ 187 188 #define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */ 189 190 #define CLUT_SIZE 256 191 192 #define CONSTA_MAX 0xFF /* CONSTant Alpha MAX= 1.0 */ 193 #define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */ 194 #define BF1_CA 0x400 /* Constant Alpha */ 195 #define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */ 196 #define BF2_1CA 0x005 /* 1 - Constant Alpha */ 197 198 #define NB_PF 8 /* Max nb of HW pixel format */ 199 200 enum ltdc_pix_fmt { 201 PF_NONE, 202 /* RGB formats */ 203 PF_ARGB8888, /* ARGB [32 bits] */ 204 PF_RGBA8888, /* RGBA [32 bits] */ 205 PF_RGB888, /* RGB [24 bits] */ 206 PF_RGB565, /* RGB [16 bits] */ 207 PF_ARGB1555, /* ARGB A:1 bit RGB:15 bits [16 bits] */ 208 PF_ARGB4444, /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */ 209 /* Indexed formats */ 210 PF_L8, /* Indexed 8 bits [8 bits] */ 211 PF_AL44, /* Alpha:4 bits + indexed 4 bits [8 bits] */ 212 PF_AL88 /* Alpha:8 bits + indexed 8 bits [16 bits] */ 213 }; 214 215 /* The index gives the encoding of the pixel format for an HW version */ 216 static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = { 217 PF_ARGB8888, /* 0x00 */ 218 PF_RGB888, /* 0x01 */ 219 PF_RGB565, /* 0x02 */ 220 PF_ARGB1555, /* 0x03 */ 221 PF_ARGB4444, /* 0x04 */ 222 PF_L8, /* 0x05 */ 223 PF_AL44, /* 0x06 */ 224 PF_AL88 /* 0x07 */ 225 }; 226 227 static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = { 228 PF_ARGB8888, /* 0x00 */ 229 PF_RGB888, /* 0x01 */ 230 PF_RGB565, /* 0x02 */ 231 PF_RGBA8888, /* 0x03 */ 232 PF_AL44, /* 0x04 */ 233 PF_L8, /* 0x05 */ 234 PF_ARGB1555, /* 0x06 */ 235 PF_ARGB4444 /* 0x07 */ 236 }; 237 238 static const u64 ltdc_format_modifiers[] = { 239 DRM_FORMAT_MOD_LINEAR, 240 DRM_FORMAT_MOD_INVALID 241 }; 242 243 static inline u32 reg_read(void __iomem *base, u32 reg) 244 { 245 return readl_relaxed(base + reg); 246 } 247 248 static inline void reg_write(void __iomem *base, u32 reg, u32 val) 249 { 250 writel_relaxed(val, base + reg); 251 } 252 253 static inline void reg_set(void __iomem *base, u32 reg, u32 mask) 254 { 255 reg_write(base, reg, reg_read(base, reg) | mask); 256 } 257 258 static inline void reg_clear(void __iomem *base, u32 reg, u32 mask) 259 { 260 reg_write(base, reg, reg_read(base, reg) & ~mask); 261 } 262 263 static inline void reg_update_bits(void __iomem *base, u32 reg, u32 mask, 264 u32 val) 265 { 266 reg_write(base, reg, (reg_read(base, reg) & ~mask) | val); 267 } 268 269 static inline struct ltdc_device *crtc_to_ltdc(struct drm_crtc *crtc) 270 { 271 return (struct ltdc_device *)crtc->dev->dev_private; 272 } 273 274 static inline struct ltdc_device *plane_to_ltdc(struct drm_plane *plane) 275 { 276 return (struct ltdc_device *)plane->dev->dev_private; 277 } 278 279 static inline struct ltdc_device *encoder_to_ltdc(struct drm_encoder *enc) 280 { 281 return (struct ltdc_device *)enc->dev->dev_private; 282 } 283 284 static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt) 285 { 286 enum ltdc_pix_fmt pf; 287 288 switch (drm_fmt) { 289 case DRM_FORMAT_ARGB8888: 290 case DRM_FORMAT_XRGB8888: 291 pf = PF_ARGB8888; 292 break; 293 case DRM_FORMAT_RGBA8888: 294 case DRM_FORMAT_RGBX8888: 295 pf = PF_RGBA8888; 296 break; 297 case DRM_FORMAT_RGB888: 298 pf = PF_RGB888; 299 break; 300 case DRM_FORMAT_RGB565: 301 pf = PF_RGB565; 302 break; 303 case DRM_FORMAT_ARGB1555: 304 case DRM_FORMAT_XRGB1555: 305 pf = PF_ARGB1555; 306 break; 307 case DRM_FORMAT_ARGB4444: 308 case DRM_FORMAT_XRGB4444: 309 pf = PF_ARGB4444; 310 break; 311 case DRM_FORMAT_C8: 312 pf = PF_L8; 313 break; 314 default: 315 pf = PF_NONE; 316 break; 317 /* Note: There are no DRM_FORMAT for AL44 and AL88 */ 318 } 319 320 return pf; 321 } 322 323 static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf) 324 { 325 switch (pf) { 326 case PF_ARGB8888: 327 return DRM_FORMAT_ARGB8888; 328 case PF_RGBA8888: 329 return DRM_FORMAT_RGBA8888; 330 case PF_RGB888: 331 return DRM_FORMAT_RGB888; 332 case PF_RGB565: 333 return DRM_FORMAT_RGB565; 334 case PF_ARGB1555: 335 return DRM_FORMAT_ARGB1555; 336 case PF_ARGB4444: 337 return DRM_FORMAT_ARGB4444; 338 case PF_L8: 339 return DRM_FORMAT_C8; 340 case PF_AL44: /* No DRM support */ 341 case PF_AL88: /* No DRM support */ 342 case PF_NONE: 343 default: 344 return 0; 345 } 346 } 347 348 static inline u32 get_pixelformat_without_alpha(u32 drm) 349 { 350 switch (drm) { 351 case DRM_FORMAT_ARGB4444: 352 return DRM_FORMAT_XRGB4444; 353 case DRM_FORMAT_RGBA4444: 354 return DRM_FORMAT_RGBX4444; 355 case DRM_FORMAT_ARGB1555: 356 return DRM_FORMAT_XRGB1555; 357 case DRM_FORMAT_RGBA5551: 358 return DRM_FORMAT_RGBX5551; 359 case DRM_FORMAT_ARGB8888: 360 return DRM_FORMAT_XRGB8888; 361 case DRM_FORMAT_RGBA8888: 362 return DRM_FORMAT_RGBX8888; 363 default: 364 return 0; 365 } 366 } 367 368 static irqreturn_t ltdc_irq_thread(int irq, void *arg) 369 { 370 struct drm_device *ddev = arg; 371 struct ltdc_device *ldev = ddev->dev_private; 372 struct drm_crtc *crtc = drm_crtc_from_index(ddev, 0); 373 374 /* Line IRQ : trigger the vblank event */ 375 if (ldev->irq_status & ISR_LIF) 376 drm_crtc_handle_vblank(crtc); 377 378 /* Save FIFO Underrun & Transfer Error status */ 379 mutex_lock(&ldev->err_lock); 380 if (ldev->irq_status & ISR_FUIF) 381 ldev->error_status |= ISR_FUIF; 382 if (ldev->irq_status & ISR_TERRIF) 383 ldev->error_status |= ISR_TERRIF; 384 mutex_unlock(&ldev->err_lock); 385 386 return IRQ_HANDLED; 387 } 388 389 static irqreturn_t ltdc_irq(int irq, void *arg) 390 { 391 struct drm_device *ddev = arg; 392 struct ltdc_device *ldev = ddev->dev_private; 393 394 /* Read & Clear the interrupt status */ 395 ldev->irq_status = reg_read(ldev->regs, LTDC_ISR); 396 reg_write(ldev->regs, LTDC_ICR, ldev->irq_status); 397 398 return IRQ_WAKE_THREAD; 399 } 400 401 /* 402 * DRM_CRTC 403 */ 404 405 static void ltdc_crtc_update_clut(struct drm_crtc *crtc) 406 { 407 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 408 struct drm_color_lut *lut; 409 u32 val; 410 int i; 411 412 if (!crtc->state->color_mgmt_changed || !crtc->state->gamma_lut) 413 return; 414 415 lut = (struct drm_color_lut *)crtc->state->gamma_lut->data; 416 417 for (i = 0; i < CLUT_SIZE; i++, lut++) { 418 val = ((lut->red << 8) & 0xff0000) | (lut->green & 0xff00) | 419 (lut->blue >> 8) | (i << 24); 420 reg_write(ldev->regs, LTDC_L1CLUTWR, val); 421 } 422 } 423 424 static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc, 425 struct drm_crtc_state *old_state) 426 { 427 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 428 429 DRM_DEBUG_DRIVER("\n"); 430 431 /* Sets the background color value */ 432 reg_write(ldev->regs, LTDC_BCCR, BCCR_BCBLACK); 433 434 /* Enable IRQ */ 435 reg_set(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE); 436 437 /* Commit shadow registers = update planes at next vblank */ 438 reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR); 439 440 drm_crtc_vblank_on(crtc); 441 } 442 443 static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc, 444 struct drm_crtc_state *old_state) 445 { 446 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 447 struct drm_device *ddev = crtc->dev; 448 449 DRM_DEBUG_DRIVER("\n"); 450 451 drm_crtc_vblank_off(crtc); 452 453 /* disable IRQ */ 454 reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE); 455 456 /* immediately commit disable of layers before switching off LTDC */ 457 reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR); 458 459 pm_runtime_put_sync(ddev->dev); 460 } 461 462 #define CLK_TOLERANCE_HZ 50 463 464 static enum drm_mode_status 465 ltdc_crtc_mode_valid(struct drm_crtc *crtc, 466 const struct drm_display_mode *mode) 467 { 468 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 469 int target = mode->clock * 1000; 470 int target_min = target - CLK_TOLERANCE_HZ; 471 int target_max = target + CLK_TOLERANCE_HZ; 472 int result; 473 474 result = clk_round_rate(ldev->pixel_clk, target); 475 476 DRM_DEBUG_DRIVER("clk rate target %d, available %d\n", target, result); 477 478 /* Filter modes according to the max frequency supported by the pads */ 479 if (result > ldev->caps.pad_max_freq_hz) 480 return MODE_CLOCK_HIGH; 481 482 /* 483 * Accept all "preferred" modes: 484 * - this is important for panels because panel clock tolerances are 485 * bigger than hdmi ones and there is no reason to not accept them 486 * (the fps may vary a little but it is not a problem). 487 * - the hdmi preferred mode will be accepted too, but userland will 488 * be able to use others hdmi "valid" modes if necessary. 489 */ 490 if (mode->type & DRM_MODE_TYPE_PREFERRED) 491 return MODE_OK; 492 493 /* 494 * Filter modes according to the clock value, particularly useful for 495 * hdmi modes that require precise pixel clocks. 496 */ 497 if (result < target_min || result > target_max) 498 return MODE_CLOCK_RANGE; 499 500 return MODE_OK; 501 } 502 503 static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc, 504 const struct drm_display_mode *mode, 505 struct drm_display_mode *adjusted_mode) 506 { 507 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 508 struct drm_device *ddev = crtc->dev; 509 int rate = mode->clock * 1000; 510 bool runtime_active; 511 int ret; 512 513 runtime_active = pm_runtime_active(ddev->dev); 514 515 if (runtime_active) 516 pm_runtime_put_sync(ddev->dev); 517 518 if (clk_set_rate(ldev->pixel_clk, rate) < 0) { 519 DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate); 520 return false; 521 } 522 523 adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000; 524 525 if (runtime_active) { 526 ret = pm_runtime_get_sync(ddev->dev); 527 if (ret) { 528 DRM_ERROR("Failed to fixup mode, cannot get sync\n"); 529 return false; 530 } 531 } 532 533 DRM_DEBUG_DRIVER("requested clock %dkHz, adjusted clock %dkHz\n", 534 mode->clock, adjusted_mode->clock); 535 536 return true; 537 } 538 539 static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc) 540 { 541 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 542 struct drm_device *ddev = crtc->dev; 543 struct drm_display_mode *mode = &crtc->state->adjusted_mode; 544 struct videomode vm; 545 u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h; 546 u32 total_width, total_height; 547 u32 val; 548 int ret; 549 550 if (!pm_runtime_active(ddev->dev)) { 551 ret = pm_runtime_get_sync(ddev->dev); 552 if (ret) { 553 DRM_ERROR("Failed to set mode, cannot get sync\n"); 554 return; 555 } 556 } 557 558 drm_display_mode_to_videomode(mode, &vm); 559 560 DRM_DEBUG_DRIVER("CRTC:%d mode:%s\n", crtc->base.id, mode->name); 561 DRM_DEBUG_DRIVER("Video mode: %dx%d", vm.hactive, vm.vactive); 562 DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n", 563 vm.hfront_porch, vm.hback_porch, vm.hsync_len, 564 vm.vfront_porch, vm.vback_porch, vm.vsync_len); 565 566 /* Convert video timings to ltdc timings */ 567 hsync = vm.hsync_len - 1; 568 vsync = vm.vsync_len - 1; 569 accum_hbp = hsync + vm.hback_porch; 570 accum_vbp = vsync + vm.vback_porch; 571 accum_act_w = accum_hbp + vm.hactive; 572 accum_act_h = accum_vbp + vm.vactive; 573 total_width = accum_act_w + vm.hfront_porch; 574 total_height = accum_act_h + vm.vfront_porch; 575 576 /* Configures the HS, VS, DE and PC polarities. Default Active Low */ 577 val = 0; 578 579 if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH) 580 val |= GCR_HSPOL; 581 582 if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH) 583 val |= GCR_VSPOL; 584 585 if (vm.flags & DISPLAY_FLAGS_DE_LOW) 586 val |= GCR_DEPOL; 587 588 if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) 589 val |= GCR_PCPOL; 590 591 reg_update_bits(ldev->regs, LTDC_GCR, 592 GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val); 593 594 /* Set Synchronization size */ 595 val = (hsync << 16) | vsync; 596 reg_update_bits(ldev->regs, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val); 597 598 /* Set Accumulated Back porch */ 599 val = (accum_hbp << 16) | accum_vbp; 600 reg_update_bits(ldev->regs, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val); 601 602 /* Set Accumulated Active Width */ 603 val = (accum_act_w << 16) | accum_act_h; 604 reg_update_bits(ldev->regs, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val); 605 606 /* Set total width & height */ 607 val = (total_width << 16) | total_height; 608 reg_update_bits(ldev->regs, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val); 609 610 reg_write(ldev->regs, LTDC_LIPCR, (accum_act_h + 1)); 611 } 612 613 static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc, 614 struct drm_crtc_state *old_crtc_state) 615 { 616 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 617 struct drm_device *ddev = crtc->dev; 618 struct drm_pending_vblank_event *event = crtc->state->event; 619 620 DRM_DEBUG_ATOMIC("\n"); 621 622 ltdc_crtc_update_clut(crtc); 623 624 /* Commit shadow registers = update planes at next vblank */ 625 reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR); 626 627 if (event) { 628 crtc->state->event = NULL; 629 630 spin_lock_irq(&ddev->event_lock); 631 if (drm_crtc_vblank_get(crtc) == 0) 632 drm_crtc_arm_vblank_event(crtc, event); 633 else 634 drm_crtc_send_vblank_event(crtc, event); 635 spin_unlock_irq(&ddev->event_lock); 636 } 637 } 638 639 static const struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = { 640 .mode_valid = ltdc_crtc_mode_valid, 641 .mode_fixup = ltdc_crtc_mode_fixup, 642 .mode_set_nofb = ltdc_crtc_mode_set_nofb, 643 .atomic_flush = ltdc_crtc_atomic_flush, 644 .atomic_enable = ltdc_crtc_atomic_enable, 645 .atomic_disable = ltdc_crtc_atomic_disable, 646 }; 647 648 static int ltdc_crtc_enable_vblank(struct drm_crtc *crtc) 649 { 650 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 651 652 DRM_DEBUG_DRIVER("\n"); 653 reg_set(ldev->regs, LTDC_IER, IER_LIE); 654 655 return 0; 656 } 657 658 static void ltdc_crtc_disable_vblank(struct drm_crtc *crtc) 659 { 660 struct ltdc_device *ldev = crtc_to_ltdc(crtc); 661 662 DRM_DEBUG_DRIVER("\n"); 663 reg_clear(ldev->regs, LTDC_IER, IER_LIE); 664 } 665 666 bool ltdc_crtc_scanoutpos(struct drm_device *ddev, unsigned int pipe, 667 bool in_vblank_irq, int *vpos, int *hpos, 668 ktime_t *stime, ktime_t *etime, 669 const struct drm_display_mode *mode) 670 { 671 struct ltdc_device *ldev = ddev->dev_private; 672 int line, vactive_start, vactive_end, vtotal; 673 674 if (stime) 675 *stime = ktime_get(); 676 677 /* The active area starts after vsync + front porch and ends 678 * at vsync + front porc + display size. 679 * The total height also include back porch. 680 * We have 3 possible cases to handle: 681 * - line < vactive_start: vpos = line - vactive_start and will be 682 * negative 683 * - vactive_start < line < vactive_end: vpos = line - vactive_start 684 * and will be positive 685 * - line > vactive_end: vpos = line - vtotal - vactive_start 686 * and will negative 687 * 688 * Computation for the two first cases are identical so we can 689 * simplify the code and only test if line > vactive_end 690 */ 691 if (pm_runtime_active(ddev->dev)) { 692 line = reg_read(ldev->regs, LTDC_CPSR) & CPSR_CYPOS; 693 vactive_start = reg_read(ldev->regs, LTDC_BPCR) & BPCR_AVBP; 694 vactive_end = reg_read(ldev->regs, LTDC_AWCR) & AWCR_AAH; 695 vtotal = reg_read(ldev->regs, LTDC_TWCR) & TWCR_TOTALH; 696 697 if (line > vactive_end) 698 *vpos = line - vtotal - vactive_start; 699 else 700 *vpos = line - vactive_start; 701 } else { 702 *vpos = 0; 703 } 704 705 *hpos = 0; 706 707 if (etime) 708 *etime = ktime_get(); 709 710 return true; 711 } 712 713 static const struct drm_crtc_funcs ltdc_crtc_funcs = { 714 .destroy = drm_crtc_cleanup, 715 .set_config = drm_atomic_helper_set_config, 716 .page_flip = drm_atomic_helper_page_flip, 717 .reset = drm_atomic_helper_crtc_reset, 718 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 719 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 720 .enable_vblank = ltdc_crtc_enable_vblank, 721 .disable_vblank = ltdc_crtc_disable_vblank, 722 .gamma_set = drm_atomic_helper_legacy_gamma_set, 723 }; 724 725 /* 726 * DRM_PLANE 727 */ 728 729 static int ltdc_plane_atomic_check(struct drm_plane *plane, 730 struct drm_plane_state *state) 731 { 732 struct drm_framebuffer *fb = state->fb; 733 u32 src_w, src_h; 734 735 DRM_DEBUG_DRIVER("\n"); 736 737 if (!fb) 738 return 0; 739 740 /* convert src_ from 16:16 format */ 741 src_w = state->src_w >> 16; 742 src_h = state->src_h >> 16; 743 744 /* Reject scaling */ 745 if (src_w != state->crtc_w || src_h != state->crtc_h) { 746 DRM_ERROR("Scaling is not supported"); 747 return -EINVAL; 748 } 749 750 return 0; 751 } 752 753 static void ltdc_plane_atomic_update(struct drm_plane *plane, 754 struct drm_plane_state *oldstate) 755 { 756 struct ltdc_device *ldev = plane_to_ltdc(plane); 757 struct drm_plane_state *state = plane->state; 758 struct drm_framebuffer *fb = state->fb; 759 u32 lofs = plane->index * LAY_OFS; 760 u32 x0 = state->crtc_x; 761 u32 x1 = state->crtc_x + state->crtc_w - 1; 762 u32 y0 = state->crtc_y; 763 u32 y1 = state->crtc_y + state->crtc_h - 1; 764 u32 src_x, src_y, src_w, src_h; 765 u32 val, pitch_in_bytes, line_length, paddr, ahbp, avbp, bpcr; 766 enum ltdc_pix_fmt pf; 767 768 if (!state->crtc || !fb) { 769 DRM_DEBUG_DRIVER("fb or crtc NULL"); 770 return; 771 } 772 773 /* convert src_ from 16:16 format */ 774 src_x = state->src_x >> 16; 775 src_y = state->src_y >> 16; 776 src_w = state->src_w >> 16; 777 src_h = state->src_h >> 16; 778 779 DRM_DEBUG_DRIVER("plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n", 780 plane->base.id, fb->base.id, 781 src_w, src_h, src_x, src_y, 782 state->crtc_w, state->crtc_h, 783 state->crtc_x, state->crtc_y); 784 785 bpcr = reg_read(ldev->regs, LTDC_BPCR); 786 ahbp = (bpcr & BPCR_AHBP) >> 16; 787 avbp = bpcr & BPCR_AVBP; 788 789 /* Configures the horizontal start and stop position */ 790 val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp); 791 reg_update_bits(ldev->regs, LTDC_L1WHPCR + lofs, 792 LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val); 793 794 /* Configures the vertical start and stop position */ 795 val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp); 796 reg_update_bits(ldev->regs, LTDC_L1WVPCR + lofs, 797 LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val); 798 799 /* Specifies the pixel format */ 800 pf = to_ltdc_pixelformat(fb->format->format); 801 for (val = 0; val < NB_PF; val++) 802 if (ldev->caps.pix_fmt_hw[val] == pf) 803 break; 804 805 if (val == NB_PF) { 806 DRM_ERROR("Pixel format %.4s not supported\n", 807 (char *)&fb->format->format); 808 val = 0; /* set by default ARGB 32 bits */ 809 } 810 reg_update_bits(ldev->regs, LTDC_L1PFCR + lofs, LXPFCR_PF, val); 811 812 /* Configures the color frame buffer pitch in bytes & line length */ 813 pitch_in_bytes = fb->pitches[0]; 814 line_length = fb->format->cpp[0] * 815 (x1 - x0 + 1) + (ldev->caps.bus_width >> 3) - 1; 816 val = ((pitch_in_bytes << 16) | line_length); 817 reg_update_bits(ldev->regs, LTDC_L1CFBLR + lofs, 818 LXCFBLR_CFBLL | LXCFBLR_CFBP, val); 819 820 /* Specifies the constant alpha value */ 821 val = CONSTA_MAX; 822 reg_update_bits(ldev->regs, LTDC_L1CACR + lofs, LXCACR_CONSTA, val); 823 824 /* Specifies the blending factors */ 825 val = BF1_PAXCA | BF2_1PAXCA; 826 if (!fb->format->has_alpha) 827 val = BF1_CA | BF2_1CA; 828 829 /* Manage hw-specific capabilities */ 830 if (ldev->caps.non_alpha_only_l1 && 831 plane->type != DRM_PLANE_TYPE_PRIMARY) 832 val = BF1_PAXCA | BF2_1PAXCA; 833 834 reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs, 835 LXBFCR_BF2 | LXBFCR_BF1, val); 836 837 /* Configures the frame buffer line number */ 838 val = y1 - y0 + 1; 839 reg_update_bits(ldev->regs, LTDC_L1CFBLNR + lofs, LXCFBLNR_CFBLN, val); 840 841 /* Sets the FB address */ 842 paddr = (u32)drm_fb_cma_get_gem_addr(fb, state, 0); 843 844 DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr); 845 reg_write(ldev->regs, LTDC_L1CFBAR + lofs, paddr); 846 847 /* Enable layer and CLUT if needed */ 848 val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0; 849 val |= LXCR_LEN; 850 reg_update_bits(ldev->regs, LTDC_L1CR + lofs, 851 LXCR_LEN | LXCR_CLUTEN, val); 852 853 ldev->plane_fpsi[plane->index].counter++; 854 855 mutex_lock(&ldev->err_lock); 856 if (ldev->error_status & ISR_FUIF) { 857 DRM_WARN("ltdc fifo underrun: please verify display mode\n"); 858 ldev->error_status &= ~ISR_FUIF; 859 } 860 if (ldev->error_status & ISR_TERRIF) { 861 DRM_WARN("ltdc transfer error\n"); 862 ldev->error_status &= ~ISR_TERRIF; 863 } 864 mutex_unlock(&ldev->err_lock); 865 } 866 867 static void ltdc_plane_atomic_disable(struct drm_plane *plane, 868 struct drm_plane_state *oldstate) 869 { 870 struct ltdc_device *ldev = plane_to_ltdc(plane); 871 u32 lofs = plane->index * LAY_OFS; 872 873 /* disable layer */ 874 reg_clear(ldev->regs, LTDC_L1CR + lofs, LXCR_LEN); 875 876 DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n", 877 oldstate->crtc->base.id, plane->base.id); 878 } 879 880 static void ltdc_plane_atomic_print_state(struct drm_printer *p, 881 const struct drm_plane_state *state) 882 { 883 struct drm_plane *plane = state->plane; 884 struct ltdc_device *ldev = plane_to_ltdc(plane); 885 struct fps_info *fpsi = &ldev->plane_fpsi[plane->index]; 886 int ms_since_last; 887 ktime_t now; 888 889 now = ktime_get(); 890 ms_since_last = ktime_to_ms(ktime_sub(now, fpsi->last_timestamp)); 891 892 drm_printf(p, "\tuser_updates=%dfps\n", 893 DIV_ROUND_CLOSEST(fpsi->counter * 1000, ms_since_last)); 894 895 fpsi->last_timestamp = now; 896 fpsi->counter = 0; 897 } 898 899 static bool ltdc_plane_format_mod_supported(struct drm_plane *plane, 900 u32 format, 901 u64 modifier) 902 { 903 if (modifier == DRM_FORMAT_MOD_LINEAR) 904 return true; 905 906 return false; 907 } 908 909 static const struct drm_plane_funcs ltdc_plane_funcs = { 910 .update_plane = drm_atomic_helper_update_plane, 911 .disable_plane = drm_atomic_helper_disable_plane, 912 .destroy = drm_plane_cleanup, 913 .reset = drm_atomic_helper_plane_reset, 914 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, 915 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, 916 .atomic_print_state = ltdc_plane_atomic_print_state, 917 .format_mod_supported = ltdc_plane_format_mod_supported, 918 }; 919 920 static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = { 921 .prepare_fb = drm_gem_fb_prepare_fb, 922 .atomic_check = ltdc_plane_atomic_check, 923 .atomic_update = ltdc_plane_atomic_update, 924 .atomic_disable = ltdc_plane_atomic_disable, 925 }; 926 927 static struct drm_plane *ltdc_plane_create(struct drm_device *ddev, 928 enum drm_plane_type type) 929 { 930 unsigned long possible_crtcs = CRTC_MASK; 931 struct ltdc_device *ldev = ddev->dev_private; 932 struct device *dev = ddev->dev; 933 struct drm_plane *plane; 934 unsigned int i, nb_fmt = 0; 935 u32 formats[NB_PF * 2]; 936 u32 drm_fmt, drm_fmt_no_alpha; 937 const u64 *modifiers = ltdc_format_modifiers; 938 int ret; 939 940 /* Get supported pixel formats */ 941 for (i = 0; i < NB_PF; i++) { 942 drm_fmt = to_drm_pixelformat(ldev->caps.pix_fmt_hw[i]); 943 if (!drm_fmt) 944 continue; 945 formats[nb_fmt++] = drm_fmt; 946 947 /* Add the no-alpha related format if any & supported */ 948 drm_fmt_no_alpha = get_pixelformat_without_alpha(drm_fmt); 949 if (!drm_fmt_no_alpha) 950 continue; 951 952 /* Manage hw-specific capabilities */ 953 if (ldev->caps.non_alpha_only_l1 && 954 type != DRM_PLANE_TYPE_PRIMARY) 955 continue; 956 957 formats[nb_fmt++] = drm_fmt_no_alpha; 958 } 959 960 plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL); 961 if (!plane) 962 return NULL; 963 964 ret = drm_universal_plane_init(ddev, plane, possible_crtcs, 965 <dc_plane_funcs, formats, nb_fmt, 966 modifiers, type, NULL); 967 if (ret < 0) 968 return NULL; 969 970 drm_plane_helper_add(plane, <dc_plane_helper_funcs); 971 972 DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id); 973 974 return plane; 975 } 976 977 static void ltdc_plane_destroy_all(struct drm_device *ddev) 978 { 979 struct drm_plane *plane, *plane_temp; 980 981 list_for_each_entry_safe(plane, plane_temp, 982 &ddev->mode_config.plane_list, head) 983 drm_plane_cleanup(plane); 984 } 985 986 static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc) 987 { 988 struct ltdc_device *ldev = ddev->dev_private; 989 struct drm_plane *primary, *overlay; 990 unsigned int i; 991 int ret; 992 993 primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY); 994 if (!primary) { 995 DRM_ERROR("Can not create primary plane\n"); 996 return -EINVAL; 997 } 998 999 ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL, 1000 <dc_crtc_funcs, NULL); 1001 if (ret) { 1002 DRM_ERROR("Can not initialize CRTC\n"); 1003 goto cleanup; 1004 } 1005 1006 drm_crtc_helper_add(crtc, <dc_crtc_helper_funcs); 1007 1008 drm_mode_crtc_set_gamma_size(crtc, CLUT_SIZE); 1009 drm_crtc_enable_color_mgmt(crtc, 0, false, CLUT_SIZE); 1010 1011 DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id); 1012 1013 /* Add planes. Note : the first layer is used by primary plane */ 1014 for (i = 1; i < ldev->caps.nb_layers; i++) { 1015 overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY); 1016 if (!overlay) { 1017 ret = -ENOMEM; 1018 DRM_ERROR("Can not create overlay plane %d\n", i); 1019 goto cleanup; 1020 } 1021 } 1022 1023 return 0; 1024 1025 cleanup: 1026 ltdc_plane_destroy_all(ddev); 1027 return ret; 1028 } 1029 1030 /* 1031 * DRM_ENCODER 1032 */ 1033 1034 static const struct drm_encoder_funcs ltdc_encoder_funcs = { 1035 .destroy = drm_encoder_cleanup, 1036 }; 1037 1038 static void ltdc_encoder_disable(struct drm_encoder *encoder) 1039 { 1040 struct drm_device *ddev = encoder->dev; 1041 struct ltdc_device *ldev = ddev->dev_private; 1042 1043 DRM_DEBUG_DRIVER("\n"); 1044 1045 /* Disable LTDC */ 1046 reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN); 1047 1048 /* Set to sleep state the pinctrl whatever type of encoder */ 1049 pinctrl_pm_select_sleep_state(ddev->dev); 1050 } 1051 1052 static void ltdc_encoder_enable(struct drm_encoder *encoder) 1053 { 1054 struct drm_device *ddev = encoder->dev; 1055 struct ltdc_device *ldev = ddev->dev_private; 1056 1057 DRM_DEBUG_DRIVER("\n"); 1058 1059 /* Enable LTDC */ 1060 reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN); 1061 } 1062 1063 static void ltdc_encoder_mode_set(struct drm_encoder *encoder, 1064 struct drm_display_mode *mode, 1065 struct drm_display_mode *adjusted_mode) 1066 { 1067 struct drm_device *ddev = encoder->dev; 1068 1069 DRM_DEBUG_DRIVER("\n"); 1070 1071 /* 1072 * Set to default state the pinctrl only with DPI type. 1073 * Others types like DSI, don't need pinctrl due to 1074 * internal bridge (the signals do not come out of the chipset). 1075 */ 1076 if (encoder->encoder_type == DRM_MODE_ENCODER_DPI) 1077 pinctrl_pm_select_default_state(ddev->dev); 1078 } 1079 1080 static const struct drm_encoder_helper_funcs ltdc_encoder_helper_funcs = { 1081 .disable = ltdc_encoder_disable, 1082 .enable = ltdc_encoder_enable, 1083 .mode_set = ltdc_encoder_mode_set, 1084 }; 1085 1086 static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge) 1087 { 1088 struct drm_encoder *encoder; 1089 int ret; 1090 1091 encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL); 1092 if (!encoder) 1093 return -ENOMEM; 1094 1095 encoder->possible_crtcs = CRTC_MASK; 1096 encoder->possible_clones = 0; /* No cloning support */ 1097 1098 drm_encoder_init(ddev, encoder, <dc_encoder_funcs, 1099 DRM_MODE_ENCODER_DPI, NULL); 1100 1101 drm_encoder_helper_add(encoder, <dc_encoder_helper_funcs); 1102 1103 ret = drm_bridge_attach(encoder, bridge, NULL); 1104 if (ret) { 1105 drm_encoder_cleanup(encoder); 1106 return -EINVAL; 1107 } 1108 1109 DRM_DEBUG_DRIVER("Bridge encoder:%d created\n", encoder->base.id); 1110 1111 return 0; 1112 } 1113 1114 static int ltdc_get_caps(struct drm_device *ddev) 1115 { 1116 struct ltdc_device *ldev = ddev->dev_private; 1117 u32 bus_width_log2, lcr, gc2r; 1118 1119 /* 1120 * at least 1 layer must be managed & the number of layers 1121 * must not exceed LTDC_MAX_LAYER 1122 */ 1123 lcr = reg_read(ldev->regs, LTDC_LCR); 1124 1125 ldev->caps.nb_layers = clamp((int)lcr, 1, LTDC_MAX_LAYER); 1126 1127 /* set data bus width */ 1128 gc2r = reg_read(ldev->regs, LTDC_GC2R); 1129 bus_width_log2 = (gc2r & GC2R_BW) >> 4; 1130 ldev->caps.bus_width = 8 << bus_width_log2; 1131 ldev->caps.hw_version = reg_read(ldev->regs, LTDC_IDR); 1132 1133 switch (ldev->caps.hw_version) { 1134 case HWVER_10200: 1135 case HWVER_10300: 1136 ldev->caps.reg_ofs = REG_OFS_NONE; 1137 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a0; 1138 /* 1139 * Hw older versions support non-alpha color formats derived 1140 * from native alpha color formats only on the primary layer. 1141 * For instance, RG16 native format without alpha works fine 1142 * on 2nd layer but XR24 (derived color format from AR24) 1143 * does not work on 2nd layer. 1144 */ 1145 ldev->caps.non_alpha_only_l1 = true; 1146 ldev->caps.pad_max_freq_hz = 90000000; 1147 if (ldev->caps.hw_version == HWVER_10200) 1148 ldev->caps.pad_max_freq_hz = 65000000; 1149 break; 1150 case HWVER_20101: 1151 ldev->caps.reg_ofs = REG_OFS_4; 1152 ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1; 1153 ldev->caps.non_alpha_only_l1 = false; 1154 ldev->caps.pad_max_freq_hz = 150000000; 1155 break; 1156 default: 1157 return -ENODEV; 1158 } 1159 1160 return 0; 1161 } 1162 1163 void ltdc_suspend(struct drm_device *ddev) 1164 { 1165 struct ltdc_device *ldev = ddev->dev_private; 1166 1167 DRM_DEBUG_DRIVER("\n"); 1168 clk_disable_unprepare(ldev->pixel_clk); 1169 } 1170 1171 int ltdc_resume(struct drm_device *ddev) 1172 { 1173 struct ltdc_device *ldev = ddev->dev_private; 1174 int ret; 1175 1176 DRM_DEBUG_DRIVER("\n"); 1177 1178 ret = clk_prepare_enable(ldev->pixel_clk); 1179 if (ret) { 1180 DRM_ERROR("failed to enable pixel clock (%d)\n", ret); 1181 return ret; 1182 } 1183 1184 return 0; 1185 } 1186 1187 int ltdc_load(struct drm_device *ddev) 1188 { 1189 struct platform_device *pdev = to_platform_device(ddev->dev); 1190 struct ltdc_device *ldev = ddev->dev_private; 1191 struct device *dev = ddev->dev; 1192 struct device_node *np = dev->of_node; 1193 struct drm_bridge *bridge[MAX_ENDPOINTS] = {NULL}; 1194 struct drm_panel *panel[MAX_ENDPOINTS] = {NULL}; 1195 struct drm_crtc *crtc; 1196 struct reset_control *rstc; 1197 struct resource *res; 1198 int irq, ret, i, endpoint_not_ready = -ENODEV; 1199 1200 DRM_DEBUG_DRIVER("\n"); 1201 1202 /* Get endpoints if any */ 1203 for (i = 0; i < MAX_ENDPOINTS; i++) { 1204 ret = drm_of_find_panel_or_bridge(np, 0, i, &panel[i], 1205 &bridge[i]); 1206 1207 /* 1208 * If at least one endpoint is -EPROBE_DEFER, defer probing, 1209 * else if at least one endpoint is ready, continue probing. 1210 */ 1211 if (ret == -EPROBE_DEFER) 1212 return ret; 1213 else if (!ret) 1214 endpoint_not_ready = 0; 1215 } 1216 1217 if (endpoint_not_ready) 1218 return endpoint_not_ready; 1219 1220 rstc = devm_reset_control_get_exclusive(dev, NULL); 1221 1222 mutex_init(&ldev->err_lock); 1223 1224 ldev->pixel_clk = devm_clk_get(dev, "lcd"); 1225 if (IS_ERR(ldev->pixel_clk)) { 1226 if (PTR_ERR(ldev->pixel_clk) != -EPROBE_DEFER) 1227 DRM_ERROR("Unable to get lcd clock\n"); 1228 return PTR_ERR(ldev->pixel_clk); 1229 } 1230 1231 if (clk_prepare_enable(ldev->pixel_clk)) { 1232 DRM_ERROR("Unable to prepare pixel clock\n"); 1233 return -ENODEV; 1234 } 1235 1236 if (!IS_ERR(rstc)) { 1237 reset_control_assert(rstc); 1238 usleep_range(10, 20); 1239 reset_control_deassert(rstc); 1240 } 1241 1242 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1243 ldev->regs = devm_ioremap_resource(dev, res); 1244 if (IS_ERR(ldev->regs)) { 1245 DRM_ERROR("Unable to get ltdc registers\n"); 1246 ret = PTR_ERR(ldev->regs); 1247 goto err; 1248 } 1249 1250 /* Disable interrupts */ 1251 reg_clear(ldev->regs, LTDC_IER, 1252 IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE); 1253 1254 for (i = 0; i < MAX_IRQ; i++) { 1255 irq = platform_get_irq(pdev, i); 1256 if (irq == -EPROBE_DEFER) 1257 goto err; 1258 1259 if (irq < 0) 1260 continue; 1261 1262 ret = devm_request_threaded_irq(dev, irq, ltdc_irq, 1263 ltdc_irq_thread, IRQF_ONESHOT, 1264 dev_name(dev), ddev); 1265 if (ret) { 1266 DRM_ERROR("Failed to register LTDC interrupt\n"); 1267 goto err; 1268 } 1269 } 1270 1271 1272 ret = ltdc_get_caps(ddev); 1273 if (ret) { 1274 DRM_ERROR("hardware identifier (0x%08x) not supported!\n", 1275 ldev->caps.hw_version); 1276 goto err; 1277 } 1278 1279 DRM_DEBUG_DRIVER("ltdc hw version 0x%08x\n", ldev->caps.hw_version); 1280 1281 /* Add endpoints panels or bridges if any */ 1282 for (i = 0; i < MAX_ENDPOINTS; i++) { 1283 if (panel[i]) { 1284 bridge[i] = drm_panel_bridge_add_typed(panel[i], 1285 DRM_MODE_CONNECTOR_DPI); 1286 if (IS_ERR(bridge[i])) { 1287 DRM_ERROR("panel-bridge endpoint %d\n", i); 1288 ret = PTR_ERR(bridge[i]); 1289 goto err; 1290 } 1291 } 1292 1293 if (bridge[i]) { 1294 ret = ltdc_encoder_init(ddev, bridge[i]); 1295 if (ret) { 1296 DRM_ERROR("init encoder endpoint %d\n", i); 1297 goto err; 1298 } 1299 } 1300 } 1301 1302 crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL); 1303 if (!crtc) { 1304 DRM_ERROR("Failed to allocate crtc\n"); 1305 ret = -ENOMEM; 1306 goto err; 1307 } 1308 1309 ddev->mode_config.allow_fb_modifiers = true; 1310 1311 ret = ltdc_crtc_init(ddev, crtc); 1312 if (ret) { 1313 DRM_ERROR("Failed to init crtc\n"); 1314 goto err; 1315 } 1316 1317 ret = drm_vblank_init(ddev, NB_CRTC); 1318 if (ret) { 1319 DRM_ERROR("Failed calling drm_vblank_init()\n"); 1320 goto err; 1321 } 1322 1323 /* Allow usage of vblank without having to call drm_irq_install */ 1324 ddev->irq_enabled = 1; 1325 1326 clk_disable_unprepare(ldev->pixel_clk); 1327 1328 pinctrl_pm_select_sleep_state(ddev->dev); 1329 1330 pm_runtime_enable(ddev->dev); 1331 1332 return 0; 1333 err: 1334 for (i = 0; i < MAX_ENDPOINTS; i++) 1335 drm_panel_bridge_remove(bridge[i]); 1336 1337 clk_disable_unprepare(ldev->pixel_clk); 1338 1339 return ret; 1340 } 1341 1342 void ltdc_unload(struct drm_device *ddev) 1343 { 1344 int i; 1345 1346 DRM_DEBUG_DRIVER("\n"); 1347 1348 for (i = 0; i < MAX_ENDPOINTS; i++) 1349 drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i); 1350 1351 pm_runtime_disable(ddev->dev); 1352 } 1353 1354 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>"); 1355 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>"); 1356 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>"); 1357 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>"); 1358 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver"); 1359 MODULE_LICENSE("GPL v2"); 1360