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