drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2016 Allwinnertech Co., Ltd.
   4  * Copyright (C) 2017-2018 Bootlin
   5  *
   6  * Maxime Ripard <maxime.ripard@bootlin.com>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/component.h>
  11 #include <linux/crc-ccitt.h>
  12 #include <linux/module.h>
  13 #include <linux/of_address.h>
  14 #include <linux/phy/phy-mipi-dphy.h>
  15 #include <linux/phy/phy.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/consumer.h>
  20 #include <linux/reset.h>
  21 #include <linux/slab.h>
  22
  23 #include <drm/drm_atomic_helper.h>
  24 #include <drm/drm_mipi_dsi.h>
  25 #include <drm/drm_panel.h>
  26 #include <drm/drm_print.h>
  27 #include <drm/drm_probe_helper.h>
  28
  29 #include "sun4i_crtc.h"
  30 #include "sun4i_drv.h"
  31 #include "sun4i_tcon.h"
  32 #include "sun6i_mipi_dsi.h"
  33
  34 #include <video/mipi_display.h>
  35
  36 #define SUN6I_DSI_CTL_REG               0x000
  37 #define SUN6I_DSI_CTL_EN                        BIT(0)
  38
  39 #define SUN6I_DSI_BASIC_CTL_REG         0x00c
  40 #define SUN6I_DSI_BASIC_CTL_TRAIL_INV(n)                (((n) & 0xf) << 4)
  41 #define SUN6I_DSI_BASIC_CTL_TRAIL_FILL          BIT(3)
  42 #define SUN6I_DSI_BASIC_CTL_HBP_DIS             BIT(2)
  43 #define SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS         BIT(1)
  44 #define SUN6I_DSI_BASIC_CTL_VIDEO_BURST         BIT(0)
  45
  46 #define SUN6I_DSI_BASIC_CTL0_REG        0x010
  47 #define SUN6I_DSI_BASIC_CTL0_HS_EOTP_EN         BIT(18)
  48 #define SUN6I_DSI_BASIC_CTL0_CRC_EN             BIT(17)
  49 #define SUN6I_DSI_BASIC_CTL0_ECC_EN             BIT(16)
  50 #define SUN6I_DSI_BASIC_CTL0_INST_ST            BIT(0)
  51
  52 #define SUN6I_DSI_BASIC_CTL1_REG        0x014
  53 #define SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(n)  (((n) & 0x1fff) << 4)
  54 #define SUN6I_DSI_BASIC_CTL1_VIDEO_FILL         BIT(2)
  55 #define SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION    BIT(1)
  56 #define SUN6I_DSI_BASIC_CTL1_VIDEO_MODE         BIT(0)
  57
  58 #define SUN6I_DSI_BASIC_SIZE0_REG       0x018
  59 #define SUN6I_DSI_BASIC_SIZE0_VBP(n)            (((n) & 0xfff) << 16)
  60 #define SUN6I_DSI_BASIC_SIZE0_VSA(n)            ((n) & 0xfff)
  61
  62 #define SUN6I_DSI_BASIC_SIZE1_REG       0x01c
  63 #define SUN6I_DSI_BASIC_SIZE1_VT(n)             (((n) & 0xfff) << 16)
  64 #define SUN6I_DSI_BASIC_SIZE1_VACT(n)           ((n) & 0xfff)
  65
  66 #define SUN6I_DSI_INST_FUNC_REG(n)      (0x020 + (n) * 0x04)
  67 #define SUN6I_DSI_INST_FUNC_INST_MODE(n)        (((n) & 0xf) << 28)
  68 #define SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(n)     (((n) & 0xf) << 24)
  69 #define SUN6I_DSI_INST_FUNC_TRANS_PACKET(n)     (((n) & 0xf) << 20)
  70 #define SUN6I_DSI_INST_FUNC_LANE_CEN            BIT(4)
  71 #define SUN6I_DSI_INST_FUNC_LANE_DEN(n)         ((n) & 0xf)
  72
  73 #define SUN6I_DSI_INST_LOOP_SEL_REG     0x040
  74
  75 #define SUN6I_DSI_INST_LOOP_NUM_REG(n)  (0x044 + (n) * 0x10)
  76 #define SUN6I_DSI_INST_LOOP_NUM_N1(n)           (((n) & 0xfff) << 16)
  77 #define SUN6I_DSI_INST_LOOP_NUM_N0(n)           ((n) & 0xfff)
  78
  79 #define SUN6I_DSI_INST_JUMP_SEL_REG     0x048
  80
  81 #define SUN6I_DSI_INST_JUMP_CFG_REG(n)  (0x04c + (n) * 0x04)
  82 #define SUN6I_DSI_INST_JUMP_CFG_TO(n)           (((n) & 0xf) << 20)
  83 #define SUN6I_DSI_INST_JUMP_CFG_POINT(n)        (((n) & 0xf) << 16)
  84 #define SUN6I_DSI_INST_JUMP_CFG_NUM(n)          ((n) & 0xffff)
  85
  86 #define SUN6I_DSI_TRANS_START_REG       0x060
  87
  88 #define SUN6I_DSI_TRANS_ZERO_REG        0x078
  89
  90 #define SUN6I_DSI_TCON_DRQ_REG          0x07c
  91 #define SUN6I_DSI_TCON_DRQ_ENABLE_MODE          BIT(28)
  92 #define SUN6I_DSI_TCON_DRQ_SET(n)               ((n) & 0x3ff)
  93
  94 #define SUN6I_DSI_PIXEL_CTL0_REG        0x080
  95 #define SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE    BIT(16)
  96 #define SUN6I_DSI_PIXEL_CTL0_FORMAT(n)          ((n) & 0xf)
  97
  98 #define SUN6I_DSI_PIXEL_CTL1_REG        0x084
  99
 100 #define SUN6I_DSI_PIXEL_PH_REG          0x090
 101 #define SUN6I_DSI_PIXEL_PH_ECC(n)               (((n) & 0xff) << 24)
 102 #define SUN6I_DSI_PIXEL_PH_WC(n)                (((n) & 0xffff) << 8)
 103 #define SUN6I_DSI_PIXEL_PH_VC(n)                (((n) & 3) << 6)
 104 #define SUN6I_DSI_PIXEL_PH_DT(n)                ((n) & 0x3f)
 105
 106 #define SUN6I_DSI_PIXEL_PF0_REG         0x098
 107 #define SUN6I_DSI_PIXEL_PF0_CRC_FORCE(n)        ((n) & 0xffff)
 108
 109 #define SUN6I_DSI_PIXEL_PF1_REG         0x09c
 110 #define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(n)   (((n) & 0xffff) << 16)
 111 #define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(n)   ((n) & 0xffff)
 112
 113 #define SUN6I_DSI_SYNC_HSS_REG          0x0b0
 114
 115 #define SUN6I_DSI_SYNC_HSE_REG          0x0b4
 116
 117 #define SUN6I_DSI_SYNC_VSS_REG          0x0b8
 118
 119 #define SUN6I_DSI_SYNC_VSE_REG          0x0bc
 120
 121 #define SUN6I_DSI_BLK_HSA0_REG          0x0c0
 122
 123 #define SUN6I_DSI_BLK_HSA1_REG          0x0c4
 124 #define SUN6I_DSI_BLK_PF(n)                     (((n) & 0xffff) << 16)
 125 #define SUN6I_DSI_BLK_PD(n)                     ((n) & 0xff)
 126
 127 #define SUN6I_DSI_BLK_HBP0_REG          0x0c8
 128
 129 #define SUN6I_DSI_BLK_HBP1_REG          0x0cc
 130
 131 #define SUN6I_DSI_BLK_HFP0_REG          0x0d0
 132
 133 #define SUN6I_DSI_BLK_HFP1_REG          0x0d4
 134
 135 #define SUN6I_DSI_BLK_HBLK0_REG         0x0e0
 136
 137 #define SUN6I_DSI_BLK_HBLK1_REG         0x0e4
 138
 139 #define SUN6I_DSI_BLK_VBLK0_REG         0x0e8
 140
 141 #define SUN6I_DSI_BLK_VBLK1_REG         0x0ec
 142
 143 #define SUN6I_DSI_BURST_LINE_REG        0x0f0
 144 #define SUN6I_DSI_BURST_LINE_SYNC_POINT(n)      (((n) & 0xffff) << 16)
 145 #define SUN6I_DSI_BURST_LINE_NUM(n)             ((n) & 0xffff)
 146
 147 #define SUN6I_DSI_BURST_DRQ_REG         0x0f4
 148 #define SUN6I_DSI_BURST_DRQ_EDGE1(n)            (((n) & 0xffff) << 16)
 149 #define SUN6I_DSI_BURST_DRQ_EDGE0(n)            ((n) & 0xffff)
 150
 151 #define SUN6I_DSI_CMD_CTL_REG           0x200
 152 #define SUN6I_DSI_CMD_CTL_RX_OVERFLOW           BIT(26)
 153 #define SUN6I_DSI_CMD_CTL_RX_FLAG               BIT(25)
 154 #define SUN6I_DSI_CMD_CTL_TX_FLAG               BIT(9)
 155
 156 #define SUN6I_DSI_CMD_RX_REG(n)         (0x240 + (n) * 0x04)
 157
 158 #define SUN6I_DSI_DEBUG_DATA_REG        0x2f8
 159
 160 #define SUN6I_DSI_CMD_TX_REG(n)         (0x300 + (n) * 0x04)
 161
 162 #define SUN6I_DSI_SYNC_POINT            40
 163
 164 enum sun6i_dsi_start_inst {
 165         DSI_START_LPRX,
 166         DSI_START_LPTX,
 167         DSI_START_HSC,
 168         DSI_START_HSD,
 169 };
 170
 171 enum sun6i_dsi_inst_id {
 172         DSI_INST_ID_LP11        = 0,
 173         DSI_INST_ID_TBA,
 174         DSI_INST_ID_HSC,
 175         DSI_INST_ID_HSD,
 176         DSI_INST_ID_LPDT,
 177         DSI_INST_ID_HSCEXIT,
 178         DSI_INST_ID_NOP,
 179         DSI_INST_ID_DLY,
 180         DSI_INST_ID_END         = 15,
 181 };
 182
 183 enum sun6i_dsi_inst_mode {
 184         DSI_INST_MODE_STOP      = 0,
 185         DSI_INST_MODE_TBA,
 186         DSI_INST_MODE_HS,
 187         DSI_INST_MODE_ESCAPE,
 188         DSI_INST_MODE_HSCEXIT,
 189         DSI_INST_MODE_NOP,
 190 };
 191
 192 enum sun6i_dsi_inst_escape {
 193         DSI_INST_ESCA_LPDT      = 0,
 194         DSI_INST_ESCA_ULPS,
 195         DSI_INST_ESCA_UN1,
 196         DSI_INST_ESCA_UN2,
 197         DSI_INST_ESCA_RESET,
 198         DSI_INST_ESCA_UN3,
 199         DSI_INST_ESCA_UN4,
 200         DSI_INST_ESCA_UN5,
 201 };
 202
 203 enum sun6i_dsi_inst_packet {
 204         DSI_INST_PACK_PIXEL     = 0,
 205         DSI_INST_PACK_COMMAND,
 206 };
 207
 208 static const u32 sun6i_dsi_ecc_array[] = {
 209         [0] = (BIT(0) | BIT(1) | BIT(2) | BIT(4) | BIT(5) | BIT(7) | BIT(10) |
 210                BIT(11) | BIT(13) | BIT(16) | BIT(20) | BIT(21) | BIT(22) |
 211                BIT(23)),
 212         [1] = (BIT(0) | BIT(1) | BIT(3) | BIT(4) | BIT(6) | BIT(8) | BIT(10) |
 213                BIT(12) | BIT(14) | BIT(17) | BIT(20) | BIT(21) | BIT(22) |
 214                BIT(23)),
 215         [2] = (BIT(0) | BIT(2) | BIT(3) | BIT(5) | BIT(6) | BIT(9) | BIT(11) |
 216                BIT(12) | BIT(15) | BIT(18) | BIT(20) | BIT(21) | BIT(22)),
 217         [3] = (BIT(1) | BIT(2) | BIT(3) | BIT(7) | BIT(8) | BIT(9) | BIT(13) |
 218                BIT(14) | BIT(15) | BIT(19) | BIT(20) | BIT(21) | BIT(23)),
 219         [4] = (BIT(4) | BIT(5) | BIT(6) | BIT(7) | BIT(8) | BIT(9) | BIT(16) |
 220                BIT(17) | BIT(18) | BIT(19) | BIT(20) | BIT(22) | BIT(23)),
 221         [5] = (BIT(10) | BIT(11) | BIT(12) | BIT(13) | BIT(14) | BIT(15) |
 222                BIT(16) | BIT(17) | BIT(18) | BIT(19) | BIT(21) | BIT(22) |
 223                BIT(23)),
 224 };
 225
 226 static u32 sun6i_dsi_ecc_compute(unsigned int data)
 227 {
 228         int i;
 229         u8 ecc = 0;
 230
 231         for (i = 0; i < ARRAY_SIZE(sun6i_dsi_ecc_array); i++) {
 232                 u32 field = sun6i_dsi_ecc_array[i];
 233                 bool init = false;
 234                 u8 val = 0;
 235                 int j;
 236
 237                 for (j = 0; j < 24; j++) {
 238                         if (!(BIT(j) & field))
 239                                 continue;
 240
 241                         if (!init) {
 242                                 val = (BIT(j) & data) ? 1 : 0;
 243                                 init = true;
 244                         } else {
 245                                 val ^= (BIT(j) & data) ? 1 : 0;
 246                         }
 247                 }
 248
 249                 ecc |= val << i;
 250         }
 251
 252         return ecc;
 253 }
 254
 255 static u16 sun6i_dsi_crc_compute(u8 const *buffer, size_t len)
 256 {
 257         return crc_ccitt(0xffff, buffer, len);
 258 }
 259
 260 static u16 sun6i_dsi_crc_repeat(u8 pd, u8 *buffer, size_t len)
 261 {
 262         memset(buffer, pd, len);
 263
 264         return sun6i_dsi_crc_compute(buffer, len);
 265 }
 266
 267 static u32 sun6i_dsi_build_sync_pkt(u8 dt, u8 vc, u8 d0, u8 d1)
 268 {
 269         u32 val = dt & 0x3f;
 270
 271         val |= (vc & 3) << 6;
 272         val |= (d0 & 0xff) << 8;
 273         val |= (d1 & 0xff) << 16;
 274         val |= sun6i_dsi_ecc_compute(val) << 24;
 275
 276         return val;
 277 }
 278
 279 static u32 sun6i_dsi_build_blk0_pkt(u8 vc, u16 wc)
 280 {
 281         return sun6i_dsi_build_sync_pkt(MIPI_DSI_BLANKING_PACKET, vc,
 282                                         wc & 0xff, wc >> 8);
 283 }
 284
 285 static u32 sun6i_dsi_build_blk1_pkt(u16 pd, u8 *buffer, size_t len)
 286 {
 287         u32 val = SUN6I_DSI_BLK_PD(pd);
 288
 289         return val | SUN6I_DSI_BLK_PF(sun6i_dsi_crc_repeat(pd, buffer, len));
 290 }
 291
 292 static void sun6i_dsi_inst_abort(struct sun6i_dsi *dsi)
 293 {
 294         regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
 295                            SUN6I_DSI_BASIC_CTL0_INST_ST, 0);
 296 }
 297
 298 static void sun6i_dsi_inst_commit(struct sun6i_dsi *dsi)
 299 {
 300         regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
 301                            SUN6I_DSI_BASIC_CTL0_INST_ST,
 302                            SUN6I_DSI_BASIC_CTL0_INST_ST);
 303 }
 304
 305 static int sun6i_dsi_inst_wait_for_completion(struct sun6i_dsi *dsi)
 306 {
 307         u32 val;
 308
 309         return regmap_read_poll_timeout(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
 310                                         val,
 311                                         !(val & SUN6I_DSI_BASIC_CTL0_INST_ST),
 312                                         100, 5000);
 313 }
 314
 315 static void sun6i_dsi_inst_setup(struct sun6i_dsi *dsi,
 316                                  enum sun6i_dsi_inst_id id,
 317                                  enum sun6i_dsi_inst_mode mode,
 318                                  bool clock, u8 data,
 319                                  enum sun6i_dsi_inst_packet packet,
 320                                  enum sun6i_dsi_inst_escape escape)
 321 {
 322         regmap_write(dsi->regs, SUN6I_DSI_INST_FUNC_REG(id),
 323                      SUN6I_DSI_INST_FUNC_INST_MODE(mode) |
 324                      SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(escape) |
 325                      SUN6I_DSI_INST_FUNC_TRANS_PACKET(packet) |
 326                      (clock ? SUN6I_DSI_INST_FUNC_LANE_CEN : 0) |
 327                      SUN6I_DSI_INST_FUNC_LANE_DEN(data));
 328 }
 329
 330 static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi,
 331                                 struct mipi_dsi_device *device)
 332 {
 333         u8 lanes_mask = GENMASK(device->lanes - 1, 0);
 334
 335         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LP11, DSI_INST_MODE_STOP,
 336                              true, lanes_mask, 0, 0);
 337
 338         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_TBA, DSI_INST_MODE_TBA,
 339                              false, 1, 0, 0);
 340
 341         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSC, DSI_INST_MODE_HS,
 342                              true, 0, DSI_INST_PACK_PIXEL, 0);
 343
 344         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSD, DSI_INST_MODE_HS,
 345                              false, lanes_mask, DSI_INST_PACK_PIXEL, 0);
 346
 347         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LPDT, DSI_INST_MODE_ESCAPE,
 348                              false, 1, DSI_INST_PACK_COMMAND,
 349                              DSI_INST_ESCA_LPDT);
 350
 351         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSCEXIT, DSI_INST_MODE_HSCEXIT,
 352                              true, 0, 0, 0);
 353
 354         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_NOP, DSI_INST_MODE_STOP,
 355                              false, lanes_mask, 0, 0);
 356
 357         sun6i_dsi_inst_setup(dsi, DSI_INST_ID_DLY, DSI_INST_MODE_NOP,
 358                              true, lanes_mask, 0, 0);
 359
 360         regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_CFG_REG(0),
 361                      SUN6I_DSI_INST_JUMP_CFG_POINT(DSI_INST_ID_NOP) |
 362                      SUN6I_DSI_INST_JUMP_CFG_TO(DSI_INST_ID_HSCEXIT) |
 363                      SUN6I_DSI_INST_JUMP_CFG_NUM(1));
 364 };
 365
 366 static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
 367                                            struct drm_display_mode *mode)
 368 {
 369         u16 delay = mode->vtotal - (mode->vsync_start - mode->vdisplay) + 1;
 370
 371         if (delay > mode->vtotal)
 372                 delay = delay % mode->vtotal;
 373
 374         return max_t(u16, delay, 1);
 375 }
 376
 377 static u16 sun6i_dsi_get_line_num(struct sun6i_dsi *dsi,
 378                                   struct drm_display_mode *mode)
 379 {
 380         struct mipi_dsi_device *device = dsi->device;
 381         unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
 382
 383         return mode->htotal * Bpp / device->lanes;
 384 }
 385
 386 static u16 sun6i_dsi_get_drq_edge0(struct sun6i_dsi *dsi,
 387                                    struct drm_display_mode *mode,
 388                                    u16 line_num, u16 edge1)
 389 {
 390         u16 edge0 = edge1;
 391
 392         edge0 += (mode->hdisplay + 40) * SUN6I_DSI_TCON_DIV / 8;
 393
 394         if (edge0 > line_num)
 395                 return edge0 - line_num;
 396
 397         return 1;
 398 }
 399
 400 static u16 sun6i_dsi_get_drq_edge1(struct sun6i_dsi *dsi,
 401                                    struct drm_display_mode *mode,
 402                                    u16 line_num)
 403 {
 404         struct mipi_dsi_device *device = dsi->device;
 405         unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
 406         unsigned int hbp = mode->htotal - mode->hsync_end;
 407         u16 edge1;
 408
 409         edge1 = SUN6I_DSI_SYNC_POINT;
 410         edge1 += (mode->hdisplay + hbp + 20) * Bpp / device->lanes;
 411
 412         if (edge1 > line_num)
 413                 return line_num;
 414
 415         return edge1;
 416 }
 417
 418 static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
 419                                   struct drm_display_mode *mode)
 420 {
 421         struct mipi_dsi_device *device = dsi->device;
 422         u32 val = 0;
 423
 424         if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
 425                 u16 line_num = sun6i_dsi_get_line_num(dsi, mode);
 426                 u16 edge0, edge1;
 427
 428                 edge1 = sun6i_dsi_get_drq_edge1(dsi, mode, line_num);
 429                 edge0 = sun6i_dsi_get_drq_edge0(dsi, mode, line_num, edge1);
 430
 431                 regmap_write(dsi->regs, SUN6I_DSI_BURST_DRQ_REG,
 432                              SUN6I_DSI_BURST_DRQ_EDGE0(edge0) |
 433                              SUN6I_DSI_BURST_DRQ_EDGE1(edge1));
 434
 435                 regmap_write(dsi->regs, SUN6I_DSI_BURST_LINE_REG,
 436                              SUN6I_DSI_BURST_LINE_NUM(line_num) |
 437                              SUN6I_DSI_BURST_LINE_SYNC_POINT(SUN6I_DSI_SYNC_POINT));
 438
 439                 val = SUN6I_DSI_TCON_DRQ_ENABLE_MODE;
 440         } else if ((mode->hsync_start - mode->hdisplay) > 20) {
 441                 /* Maaaaaagic */
 442                 u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
 443
 444                 drq *= mipi_dsi_pixel_format_to_bpp(device->format);
 445                 drq /= 32;
 446
 447                 val = (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
 448                        SUN6I_DSI_TCON_DRQ_SET(drq));
 449         }
 450
 451         regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG, val);
 452 }
 453
 454 static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
 455                                       struct drm_display_mode *mode)
 456 {
 457         struct mipi_dsi_device *device = dsi->device;
 458         u16 delay = 50 - 1;
 459
 460         if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
 461                 u32 hsync_porch = (mode->htotal - mode->hdisplay) * 150;
 462
 463                 delay = (hsync_porch / ((mode->clock / 1000) * 8));
 464                 delay -= 50;
 465         }
 466
 467         regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_SEL_REG,
 468                      2 << (4 * DSI_INST_ID_LP11) |
 469                      3 << (4 * DSI_INST_ID_DLY));
 470
 471         regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
 472                      SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
 473                      SUN6I_DSI_INST_LOOP_NUM_N1(delay));
 474         regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(1),
 475                      SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
 476                      SUN6I_DSI_INST_LOOP_NUM_N1(delay));
 477 }
 478
 479 static void sun6i_dsi_setup_format(struct sun6i_dsi *dsi,
 480                                    struct drm_display_mode *mode)
 481 {
 482         struct mipi_dsi_device *device = dsi->device;
 483         u32 val = SUN6I_DSI_PIXEL_PH_VC(device->channel);
 484         u8 dt, fmt;
 485         u16 wc;
 486
 487         /*
 488          * TODO: The format defines are only valid in video mode and
 489          * change in command mode.
 490          */
 491         switch (device->format) {
 492         case MIPI_DSI_FMT_RGB888:
 493                 dt = MIPI_DSI_PACKED_PIXEL_STREAM_24;
 494                 fmt = 8;
 495                 break;
 496         case MIPI_DSI_FMT_RGB666:
 497                 dt = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
 498                 fmt = 9;
 499                 break;
 500         case MIPI_DSI_FMT_RGB666_PACKED:
 501                 dt = MIPI_DSI_PACKED_PIXEL_STREAM_18;
 502                 fmt = 10;
 503                 break;
 504         case MIPI_DSI_FMT_RGB565:
 505                 dt = MIPI_DSI_PACKED_PIXEL_STREAM_16;
 506                 fmt = 11;
 507                 break;
 508         default:
 509                 return;
 510         }
 511         val |= SUN6I_DSI_PIXEL_PH_DT(dt);
 512
 513         wc = mode->hdisplay * mipi_dsi_pixel_format_to_bpp(device->format) / 8;
 514         val |= SUN6I_DSI_PIXEL_PH_WC(wc);
 515         val |= SUN6I_DSI_PIXEL_PH_ECC(sun6i_dsi_ecc_compute(val));
 516
 517         regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PH_REG, val);
 518
 519         regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF0_REG,
 520                      SUN6I_DSI_PIXEL_PF0_CRC_FORCE(0xffff));
 521
 522         regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF1_REG,
 523                      SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(0xffff) |
 524                      SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(0xffff));
 525
 526         regmap_write(dsi->regs, SUN6I_DSI_PIXEL_CTL0_REG,
 527                      SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE |
 528                      SUN6I_DSI_PIXEL_CTL0_FORMAT(fmt));
 529 }
 530
 531 static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 532                                     struct drm_display_mode *mode)
 533 {
 534         struct mipi_dsi_device *device = dsi->device;
 535         unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
 536         u16 hbp = 0, hfp = 0, hsa = 0, hblk = 0, vblk = 0;
 537         u32 basic_ctl = 0;
 538         size_t bytes;
 539         u8 *buffer;
 540
 541         /* Do all timing calculations up front to allocate buffer space */
 542
 543         if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
 544                 hblk = mode->hdisplay * Bpp;
 545                 basic_ctl = SUN6I_DSI_BASIC_CTL_VIDEO_BURST |
 546                             SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS |
 547                             SUN6I_DSI_BASIC_CTL_HBP_DIS;
 548
 549                 if (device->lanes == 4)
 550                         basic_ctl |= SUN6I_DSI_BASIC_CTL_TRAIL_FILL |
 551                                      SUN6I_DSI_BASIC_CTL_TRAIL_INV(0xc);
 552         } else {
 553                 /*
 554                  * A sync period is composed of a blanking packet (4
 555                  * bytes + payload + 2 bytes) and a sync event packet
 556                  * (4 bytes). Its minimal size is therefore 10 bytes
 557                  */
 558 #define HSA_PACKET_OVERHEAD     10
 559                 hsa = max((unsigned int)HSA_PACKET_OVERHEAD,
 560                           (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
 561
 562                 /*
 563                  * The backporch is set using a blanking packet (4
 564                  * bytes + payload + 2 bytes). Its minimal size is
 565                  * therefore 6 bytes
 566                  */
 567 #define HBP_PACKET_OVERHEAD     6
 568                 hbp = max((unsigned int)HBP_PACKET_OVERHEAD,
 569                           (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
 570
 571                 /*
 572                  * The frontporch is set using a sync event (4 bytes)
 573                  * and two blanking packets (each one is 4 bytes +
 574                  * payload + 2 bytes). Its minimal size is therefore
 575                  * 16 bytes
 576                  */
 577 #define HFP_PACKET_OVERHEAD     16
 578                 hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
 579                           (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);
 580
 581                 /*
 582                  * The blanking is set using a sync event (4 bytes)
 583                  * and a blanking packet (4 bytes + payload + 2
 584                  * bytes). Its minimal size is therefore 10 bytes.
 585                  */
 586 #define HBLK_PACKET_OVERHEAD    10
 587                 hblk = max((unsigned int)HBLK_PACKET_OVERHEAD,
 588                            (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp -
 589                            HBLK_PACKET_OVERHEAD);
 590
 591                 /*
 592                  * And I'm not entirely sure what vblk is about. The driver in
 593                  * Allwinner BSP is using a rather convoluted calculation
 594                  * there only for 4 lanes. However, using 0 (the !4 lanes
 595                  * case) even with a 4 lanes screen seems to work...
 596                  */
 597                 vblk = 0;
 598         }
 599
 600         /* How many bytes do we need to send all payloads? */
 601         bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk);
 602         buffer = kmalloc(bytes, GFP_KERNEL);
 603         if (WARN_ON(!buffer))
 604                 return;
 605
 606         regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, basic_ctl);
 607
 608         regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSS_REG,
 609                      sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_START,
 610                                               device->channel,
 611                                               0, 0));
 612
 613         regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSE_REG,
 614                      sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_END,
 615                                               device->channel,
 616                                               0, 0));
 617
 618         regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSS_REG,
 619                      sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_START,
 620                                               device->channel,
 621                                               0, 0));
 622
 623         regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSE_REG,
 624                      sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_END,
 625                                               device->channel,
 626                                               0, 0));
 627
 628         regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE0_REG,
 629                      SUN6I_DSI_BASIC_SIZE0_VSA(mode->vsync_end -
 630                                                mode->vsync_start) |
 631                      SUN6I_DSI_BASIC_SIZE0_VBP(mode->vtotal -
 632                                                mode->vsync_end));
 633
 634         regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE1_REG,
 635                      SUN6I_DSI_BASIC_SIZE1_VACT(mode->vdisplay) |
 636                      SUN6I_DSI_BASIC_SIZE1_VT(mode->vtotal));
 637
 638         /* sync */
 639         regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA0_REG,
 640                      sun6i_dsi_build_blk0_pkt(device->channel, hsa));
 641         regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA1_REG,
 642                      sun6i_dsi_build_blk1_pkt(0, buffer, hsa));
 643
 644         /* backporch */
 645         regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP0_REG,
 646                      sun6i_dsi_build_blk0_pkt(device->channel, hbp));
 647         regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP1_REG,
 648                      sun6i_dsi_build_blk1_pkt(0, buffer, hbp));
 649
 650         /* frontporch */
 651         regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP0_REG,
 652                      sun6i_dsi_build_blk0_pkt(device->channel, hfp));
 653         regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP1_REG,
 654                      sun6i_dsi_build_blk1_pkt(0, buffer, hfp));
 655
 656         /* hblk */
 657         regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK0_REG,
 658                      sun6i_dsi_build_blk0_pkt(device->channel, hblk));
 659         regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK1_REG,
 660                      sun6i_dsi_build_blk1_pkt(0, buffer, hblk));
 661
 662         /* vblk */
 663         regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK0_REG,
 664                      sun6i_dsi_build_blk0_pkt(device->channel, vblk));
 665         regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK1_REG,
 666                      sun6i_dsi_build_blk1_pkt(0, buffer, vblk));
 667
 668         kfree(buffer);
 669 }
 670
 671 static int sun6i_dsi_start(struct sun6i_dsi *dsi,
 672                            enum sun6i_dsi_start_inst func)
 673 {
 674         switch (func) {
 675         case DSI_START_LPTX:
 676                 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
 677                              DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
 678                              DSI_INST_ID_END  << (4 * DSI_INST_ID_LPDT));
 679                 break;
 680         case DSI_START_LPRX:
 681                 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
 682                              DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
 683                              DSI_INST_ID_DLY  << (4 * DSI_INST_ID_LPDT) |
 684                              DSI_INST_ID_TBA  << (4 * DSI_INST_ID_DLY) |
 685                              DSI_INST_ID_END  << (4 * DSI_INST_ID_TBA));
 686                 break;
 687         case DSI_START_HSC:
 688                 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
 689                              DSI_INST_ID_HSC  << (4 * DSI_INST_ID_LP11) |
 690                              DSI_INST_ID_END  << (4 * DSI_INST_ID_HSC));
 691                 break;
 692         case DSI_START_HSD:
 693                 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
 694                              DSI_INST_ID_NOP  << (4 * DSI_INST_ID_LP11) |
 695                              DSI_INST_ID_HSD  << (4 * DSI_INST_ID_NOP) |
 696                              DSI_INST_ID_DLY  << (4 * DSI_INST_ID_HSD) |
 697                              DSI_INST_ID_NOP  << (4 * DSI_INST_ID_DLY) |
 698                              DSI_INST_ID_END  << (4 * DSI_INST_ID_HSCEXIT));
 699                 break;
 700         default:
 701                 regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
 702                              DSI_INST_ID_END  << (4 * DSI_INST_ID_LP11));
 703                 break;
 704         }
 705
 706         sun6i_dsi_inst_abort(dsi);
 707         sun6i_dsi_inst_commit(dsi);
 708
 709         if (func == DSI_START_HSC)
 710                 regmap_write_bits(dsi->regs,
 711                                   SUN6I_DSI_INST_FUNC_REG(DSI_INST_ID_LP11),
 712                                   SUN6I_DSI_INST_FUNC_LANE_CEN, 0);
 713
 714         return 0;
 715 }
 716
 717 static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
 718 {
 719         struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 720         struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
 721         struct mipi_dsi_device *device = dsi->device;
 722         union phy_configure_opts opts = { 0 };
 723         struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
 724         u16 delay;
 725
 726         DRM_DEBUG_DRIVER("Enabling DSI output\n");
 727
 728         pm_runtime_get_sync(dsi->dev);
 729
 730         delay = sun6i_dsi_get_video_start_delay(dsi, mode);
 731         regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL1_REG,
 732                      SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(delay) |
 733                      SUN6I_DSI_BASIC_CTL1_VIDEO_FILL |
 734                      SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION |
 735                      SUN6I_DSI_BASIC_CTL1_VIDEO_MODE);
 736
 737         sun6i_dsi_setup_burst(dsi, mode);
 738         sun6i_dsi_setup_inst_loop(dsi, mode);
 739         sun6i_dsi_setup_format(dsi, mode);
 740         sun6i_dsi_setup_timings(dsi, mode);
 741
 742         phy_init(dsi->dphy);
 743
 744         phy_mipi_dphy_get_default_config(mode->clock * 1000,
 745                                          mipi_dsi_pixel_format_to_bpp(device->format),
 746                                          device->lanes, cfg);
 747
 748         phy_set_mode(dsi->dphy, PHY_MODE_MIPI_DPHY);
 749         phy_configure(dsi->dphy, &opts);
 750         phy_power_on(dsi->dphy);
 751
 752         if (!IS_ERR(dsi->panel))
 753                 drm_panel_prepare(dsi->panel);
 754
 755         /*
 756          * FIXME: This should be moved after the switch to HS mode.
 757          *
 758          * Unfortunately, once in HS mode, it seems like we're not
 759          * able to send DCS commands anymore, which would prevent any
 760          * panel to send any DCS command as part as their enable
 761          * method, which is quite common.
 762          *
 763          * I haven't seen any artifact due to that sub-optimal
 764          * ordering on the panels I've tested it with, so I guess this
 765          * will do for now, until that IP is better understood.
 766          */
 767         if (!IS_ERR(dsi->panel))
 768                 drm_panel_enable(dsi->panel);
 769
 770         sun6i_dsi_start(dsi, DSI_START_HSC);
 771
 772         udelay(1000);
 773
 774         sun6i_dsi_start(dsi, DSI_START_HSD);
 775 }
 776
 777 static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
 778 {
 779         struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
 780
 781         DRM_DEBUG_DRIVER("Disabling DSI output\n");
 782
 783         if (!IS_ERR(dsi->panel)) {
 784                 drm_panel_disable(dsi->panel);
 785                 drm_panel_unprepare(dsi->panel);
 786         }
 787
 788         phy_power_off(dsi->dphy);
 789         phy_exit(dsi->dphy);
 790
 791         pm_runtime_put(dsi->dev);
 792 }
 793
 794 static int sun6i_dsi_get_modes(struct drm_connector *connector)
 795 {
 796         struct sun6i_dsi *dsi = connector_to_sun6i_dsi(connector);
 797
 798         return drm_panel_get_modes(dsi->panel);
 799 }
 800
 801 static struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = {
 802         .get_modes      = sun6i_dsi_get_modes,
 803 };
 804
 805 static enum drm_connector_status
 806 sun6i_dsi_connector_detect(struct drm_connector *connector, bool force)
 807 {
 808         return connector_status_connected;
 809 }
 810
 811 static const struct drm_connector_funcs sun6i_dsi_connector_funcs = {
 812         .detect                 = sun6i_dsi_connector_detect,
 813         .fill_modes             = drm_helper_probe_single_connector_modes,
 814         .destroy                = drm_connector_cleanup,
 815         .reset                  = drm_atomic_helper_connector_reset,
 816         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 817         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 818 };
 819
 820 static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
 821         .disable        = sun6i_dsi_encoder_disable,
 822         .enable         = sun6i_dsi_encoder_enable,
 823 };
 824
 825 static const struct drm_encoder_funcs sun6i_dsi_enc_funcs = {
 826         .destroy        = drm_encoder_cleanup,
 827 };
 828
 829 static u32 sun6i_dsi_dcs_build_pkt_hdr(struct sun6i_dsi *dsi,
 830                                        const struct mipi_dsi_msg *msg)
 831 {
 832         u32 pkt = msg->type;
 833
 834         if (msg->type == MIPI_DSI_DCS_LONG_WRITE) {
 835                 pkt |= ((msg->tx_len) & 0xffff) << 8;
 836                 pkt |= (((msg->tx_len) >> 8) & 0xffff) << 16;
 837         } else {
 838                 pkt |= (((u8 *)msg->tx_buf)[0] << 8);
 839                 if (msg->tx_len > 1)
 840                         pkt |= (((u8 *)msg->tx_buf)[1] << 16);
 841         }
 842
 843         pkt |= sun6i_dsi_ecc_compute(pkt) << 24;
 844
 845         return pkt;
 846 }
 847
 848 static int sun6i_dsi_dcs_write_short(struct sun6i_dsi *dsi,
 849                                      const struct mipi_dsi_msg *msg)
 850 {
 851         regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
 852                      sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
 853         regmap_write_bits(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
 854                           0xff, (4 - 1));
 855
 856         sun6i_dsi_start(dsi, DSI_START_LPTX);
 857
 858         return msg->tx_len;
 859 }
 860
 861 static int sun6i_dsi_dcs_write_long(struct sun6i_dsi *dsi,
 862                                     const struct mipi_dsi_msg *msg)
 863 {
 864         int ret, len = 0;
 865         u8 *bounce;
 866         u16 crc;
 867
 868         regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
 869                      sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
 870
 871         bounce = kzalloc(msg->tx_len + sizeof(crc), GFP_KERNEL);
 872         if (!bounce)
 873                 return -ENOMEM;
 874
 875         memcpy(bounce, msg->tx_buf, msg->tx_len);
 876         len += msg->tx_len;
 877
 878         crc = sun6i_dsi_crc_compute(bounce, msg->tx_len);
 879         memcpy((u8 *)bounce + msg->tx_len, &crc, sizeof(crc));
 880         len += sizeof(crc);
 881
 882         regmap_bulk_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(1), bounce, len);
 883         regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG, len + 4 - 1);
 884         kfree(bounce);
 885
 886         sun6i_dsi_start(dsi, DSI_START_LPTX);
 887
 888         ret = sun6i_dsi_inst_wait_for_completion(dsi);
 889         if (ret < 0) {
 890                 sun6i_dsi_inst_abort(dsi);
 891                 return ret;
 892         }
 893
 894         /*
 895          * TODO: There's some bits (reg 0x200, bits 8/9) that
 896          * apparently can be used to check whether the data have been
 897          * sent, but I couldn't get it to work reliably.
 898          */
 899         return msg->tx_len;
 900 }
 901
 902 static int sun6i_dsi_dcs_read(struct sun6i_dsi *dsi,
 903                               const struct mipi_dsi_msg *msg)
 904 {
 905         u32 val;
 906         int ret;
 907         u8 byte0;
 908
 909         regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
 910                      sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
 911         regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
 912                      (4 - 1));
 913
 914         sun6i_dsi_start(dsi, DSI_START_LPRX);
 915
 916         ret = sun6i_dsi_inst_wait_for_completion(dsi);
 917         if (ret < 0) {
 918                 sun6i_dsi_inst_abort(dsi);
 919                 return ret;
 920         }
 921
 922         /*
 923          * TODO: There's some bits (reg 0x200, bits 24/25) that
 924          * apparently can be used to check whether the data have been
 925          * received, but I couldn't get it to work reliably.
 926          */
 927         regmap_read(dsi->regs, SUN6I_DSI_CMD_CTL_REG, &val);
 928         if (val & SUN6I_DSI_CMD_CTL_RX_OVERFLOW)
 929                 return -EIO;
 930
 931         regmap_read(dsi->regs, SUN6I_DSI_CMD_RX_REG(0), &val);
 932         byte0 = val & 0xff;
 933         if (byte0 == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT)
 934                 return -EIO;
 935
 936         ((u8 *)msg->rx_buf)[0] = (val >> 8);
 937
 938         return 1;
 939 }
 940
 941 static int sun6i_dsi_attach(struct mipi_dsi_host *host,
 942                             struct mipi_dsi_device *device)
 943 {
 944         struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
 945
 946         dsi->device = device;
 947         dsi->panel = of_drm_find_panel(device->dev.of_node);
 948         if (IS_ERR(dsi->panel))
 949                 return PTR_ERR(dsi->panel);
 950
 951         dev_info(host->dev, "Attached device %s\n", device->name);
 952
 953         return 0;
 954 }
 955
 956 static int sun6i_dsi_detach(struct mipi_dsi_host *host,
 957                             struct mipi_dsi_device *device)
 958 {
 959         struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
 960
 961         dsi->panel = NULL;
 962         dsi->device = NULL;
 963
 964         return 0;
 965 }
 966
 967 static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
 968                                   const struct mipi_dsi_msg *msg)
 969 {
 970         struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
 971         int ret;
 972
 973         ret = sun6i_dsi_inst_wait_for_completion(dsi);
 974         if (ret < 0)
 975                 sun6i_dsi_inst_abort(dsi);
 976
 977         regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
 978                      SUN6I_DSI_CMD_CTL_RX_OVERFLOW |
 979                      SUN6I_DSI_CMD_CTL_RX_FLAG |
 980                      SUN6I_DSI_CMD_CTL_TX_FLAG);
 981
 982         switch (msg->type) {
 983         case MIPI_DSI_DCS_SHORT_WRITE:
 984         case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
 985         case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
 986                 ret = sun6i_dsi_dcs_write_short(dsi, msg);
 987                 break;
 988
 989         case MIPI_DSI_DCS_LONG_WRITE:
 990                 ret = sun6i_dsi_dcs_write_long(dsi, msg);
 991                 break;
 992
 993         case MIPI_DSI_DCS_READ:
 994                 if (msg->rx_len == 1) {
 995                         ret = sun6i_dsi_dcs_read(dsi, msg);
 996                         break;
 997                 }
 998                 /* Else, fall through */
 999
1000         default:
1001                 ret = -EINVAL;
1002         }
1003
1004         return ret;
1005 }
1006
1007 static const struct mipi_dsi_host_ops sun6i_dsi_host_ops = {
1008         .attach         = sun6i_dsi_attach,
1009         .detach         = sun6i_dsi_detach,
1010         .transfer       = sun6i_dsi_transfer,
1011 };
1012
1013 static const struct regmap_config sun6i_dsi_regmap_config = {
1014         .reg_bits       = 32,
1015         .val_bits       = 32,
1016         .reg_stride     = 4,
1017         .max_register   = SUN6I_DSI_CMD_TX_REG(255),
1018         .name           = "mipi-dsi",
1019 };
1020
1021 static int sun6i_dsi_bind(struct device *dev, struct device *master,
1022                          void *data)
1023 {
1024         struct drm_device *drm = data;
1025         struct sun4i_drv *drv = drm->dev_private;
1026         struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1027         int ret;
1028
1029         if (!dsi->panel)
1030                 return -EPROBE_DEFER;
1031
1032         dsi->drv = drv;
1033
1034         drm_encoder_helper_add(&dsi->encoder,
1035                                &sun6i_dsi_enc_helper_funcs);
1036         ret = drm_encoder_init(drm,
1037                                &dsi->encoder,
1038                                &sun6i_dsi_enc_funcs,
1039                                DRM_MODE_ENCODER_DSI,
1040                                NULL);
1041         if (ret) {
1042                 dev_err(dsi->dev, "Couldn't initialise the DSI encoder\n");
1043                 return ret;
1044         }
1045         dsi->encoder.possible_crtcs = BIT(0);
1046
1047         drm_connector_helper_add(&dsi->connector,
1048                                  &sun6i_dsi_connector_helper_funcs);
1049         ret = drm_connector_init(drm, &dsi->connector,
1050                                  &sun6i_dsi_connector_funcs,
1051                                  DRM_MODE_CONNECTOR_DSI);
1052         if (ret) {
1053                 dev_err(dsi->dev,
1054                         "Couldn't initialise the DSI connector\n");
1055                 goto err_cleanup_connector;
1056         }
1057
1058         drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
1059         drm_panel_attach(dsi->panel, &dsi->connector);
1060
1061         return 0;
1062
1063 err_cleanup_connector:
1064         drm_encoder_cleanup(&dsi->encoder);
1065         return ret;
1066 }
1067
1068 static void sun6i_dsi_unbind(struct device *dev, struct device *master,
1069                             void *data)
1070 {
1071         struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1072
1073         drm_panel_detach(dsi->panel);
1074 }
1075
1076 static const struct component_ops sun6i_dsi_ops = {
1077         .bind   = sun6i_dsi_bind,
1078         .unbind = sun6i_dsi_unbind,
1079 };
1080
1081 static int sun6i_dsi_probe(struct platform_device *pdev)
1082 {
1083         struct device *dev = &pdev->dev;
1084         struct sun6i_dsi *dsi;
1085         struct resource *res;
1086         void __iomem *base;
1087         int ret;
1088
1089         dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
1090         if (!dsi)
1091                 return -ENOMEM;
1092         dev_set_drvdata(dev, dsi);
1093         dsi->dev = dev;
1094         dsi->host.ops = &sun6i_dsi_host_ops;
1095         dsi->host.dev = dev;
1096
1097         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1098         base = devm_ioremap_resource(dev, res);
1099         if (IS_ERR(base)) {
1100                 dev_err(dev, "Couldn't map the DSI encoder registers\n");
1101                 return PTR_ERR(base);
1102         }
1103
1104         dsi->regulator = devm_regulator_get(dev, "vcc-dsi");
1105         if (IS_ERR(dsi->regulator)) {
1106                 dev_err(dev, "Couldn't get VCC-DSI supply\n");
1107                 return PTR_ERR(dsi->regulator);
1108         }
1109
1110         dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
1111                                               &sun6i_dsi_regmap_config);
1112         if (IS_ERR(dsi->regs)) {
1113                 dev_err(dev, "Couldn't create the DSI encoder regmap\n");
1114                 return PTR_ERR(dsi->regs);
1115         }
1116
1117         dsi->reset = devm_reset_control_get_shared(dev, NULL);
1118         if (IS_ERR(dsi->reset)) {
1119                 dev_err(dev, "Couldn't get our reset line\n");
1120                 return PTR_ERR(dsi->reset);
1121         }
1122
1123         dsi->mod_clk = devm_clk_get(dev, "mod");
1124         if (IS_ERR(dsi->mod_clk)) {
1125                 dev_err(dev, "Couldn't get the DSI mod clock\n");
1126                 return PTR_ERR(dsi->mod_clk);
1127         }
1128
1129         /*
1130          * In order to operate properly, that clock seems to be always
1131          * set to 297MHz.
1132          */
1133         clk_set_rate_exclusive(dsi->mod_clk, 297000000);
1134
1135         dsi->dphy = devm_phy_get(dev, "dphy");
1136         if (IS_ERR(dsi->dphy)) {
1137                 dev_err(dev, "Couldn't get the MIPI D-PHY\n");
1138                 ret = PTR_ERR(dsi->dphy);
1139                 goto err_unprotect_clk;
1140         }
1141
1142         pm_runtime_enable(dev);
1143
1144         ret = mipi_dsi_host_register(&dsi->host);
1145         if (ret) {
1146                 dev_err(dev, "Couldn't register MIPI-DSI host\n");
1147                 goto err_pm_disable;
1148         }
1149
1150         ret = component_add(&pdev->dev, &sun6i_dsi_ops);
1151         if (ret) {
1152                 dev_err(dev, "Couldn't register our component\n");
1153                 goto err_remove_dsi_host;
1154         }
1155
1156         return 0;
1157
1158 err_remove_dsi_host:
1159         mipi_dsi_host_unregister(&dsi->host);
1160 err_pm_disable:
1161         pm_runtime_disable(dev);
1162 err_unprotect_clk:
1163         clk_rate_exclusive_put(dsi->mod_clk);
1164         return ret;
1165 }
1166
1167 static int sun6i_dsi_remove(struct platform_device *pdev)
1168 {
1169         struct device *dev = &pdev->dev;
1170         struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1171
1172         component_del(&pdev->dev, &sun6i_dsi_ops);
1173         mipi_dsi_host_unregister(&dsi->host);
1174         pm_runtime_disable(dev);
1175         clk_rate_exclusive_put(dsi->mod_clk);
1176
1177         return 0;
1178 }
1179
1180 static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
1181 {
1182         struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1183         int err;
1184
1185         err = regulator_enable(dsi->regulator);
1186         if (err) {
1187                 dev_err(dsi->dev, "failed to enable VCC-DSI supply: %d\n", err);
1188                 return err;
1189         }
1190
1191         reset_control_deassert(dsi->reset);
1192         clk_prepare_enable(dsi->mod_clk);
1193
1194         /*
1195          * Enable the DSI block.
1196          *
1197          * Some part of it can only be done once we get a number of
1198          * lanes, see sun6i_dsi_inst_init
1199          */
1200         regmap_write(dsi->regs, SUN6I_DSI_CTL_REG, SUN6I_DSI_CTL_EN);
1201
1202         regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
1203                      SUN6I_DSI_BASIC_CTL0_ECC_EN | SUN6I_DSI_BASIC_CTL0_CRC_EN);
1204
1205         regmap_write(dsi->regs, SUN6I_DSI_TRANS_START_REG, 10);
1206         regmap_write(dsi->regs, SUN6I_DSI_TRANS_ZERO_REG, 0);
1207
1208         if (dsi->device)
1209                 sun6i_dsi_inst_init(dsi, dsi->device);
1210
1211         regmap_write(dsi->regs, SUN6I_DSI_DEBUG_DATA_REG, 0xff);
1212
1213         return 0;
1214 }
1215
1216 static int __maybe_unused sun6i_dsi_runtime_suspend(struct device *dev)
1217 {
1218         struct sun6i_dsi *dsi = dev_get_drvdata(dev);
1219
1220         clk_disable_unprepare(dsi->mod_clk);
1221         reset_control_assert(dsi->reset);
1222         regulator_disable(dsi->regulator);
1223
1224         return 0;
1225 }
1226
1227 static const struct dev_pm_ops sun6i_dsi_pm_ops = {
1228         SET_RUNTIME_PM_OPS(sun6i_dsi_runtime_suspend,
1229                            sun6i_dsi_runtime_resume,
1230                            NULL)
1231 };
1232
1233 static const struct of_device_id sun6i_dsi_of_table[] = {
1234         { .compatible = "allwinner,sun6i-a31-mipi-dsi" },
1235         { }
1236 };
1237 MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
1238
1239 static struct platform_driver sun6i_dsi_platform_driver = {
1240         .probe          = sun6i_dsi_probe,
1241         .remove         = sun6i_dsi_remove,
1242         .driver         = {
1243                 .name           = "sun6i-mipi-dsi",
1244                 .of_match_table = sun6i_dsi_of_table,
1245                 .pm             = &sun6i_dsi_pm_ops,
1246         },
1247 };
1248 module_platform_driver(sun6i_dsi_platform_driver);
1249
1250 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1251 MODULE_DESCRIPTION("Allwinner A31 DSI Driver");
1252 MODULE_LICENSE("GPL");