drivers/gpu/drm/mcde/mcde_dsi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 #include <linux/clk.h>
   3 #include <linux/component.h>
   4 #include <linux/delay.h>
   5 #include <linux/io.h>
   6 #include <linux/mfd/syscon.h>
   7 #include <linux/module.h>
   8 #include <linux/of.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/regmap.h>
  11 #include <linux/regulator/consumer.h>
  12 #include <video/mipi_display.h>
  13
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_bridge.h>
  16 #include <drm/drm_device.h>
  17 #include <drm/drm_drv.h>
  18 #include <drm/drm_encoder.h>
  19 #include <drm/drm_mipi_dsi.h>
  20 #include <drm/drm_modeset_helper_vtables.h>
  21 #include <drm/drm_of.h>
  22 #include <drm/drm_panel.h>
  23 #include <drm/drm_print.h>
  24 #include <drm/drm_probe_helper.h>
  25
  26 #include "mcde_drm.h"
  27 #include "mcde_dsi_regs.h"
  28
  29 #define DSI_DEFAULT_LP_FREQ_HZ  19200000
  30 #define DSI_DEFAULT_HS_FREQ_HZ  420160000
  31
  32 /* PRCMU DSI reset registers */
  33 #define PRCM_DSI_SW_RESET 0x324
  34 #define PRCM_DSI_SW_RESET_DSI0_SW_RESETN BIT(0)
  35 #define PRCM_DSI_SW_RESET_DSI1_SW_RESETN BIT(1)
  36 #define PRCM_DSI_SW_RESET_DSI2_SW_RESETN BIT(2)
  37
  38 struct mcde_dsi {
  39         struct device *dev;
  40         struct mcde *mcde;
  41         struct drm_bridge bridge;
  42         struct drm_connector connector;
  43         struct drm_panel *panel;
  44         struct drm_bridge *bridge_out;
  45         struct mipi_dsi_host dsi_host;
  46         struct mipi_dsi_device *mdsi;
  47         struct clk *hs_clk;
  48         struct clk *lp_clk;
  49         unsigned long hs_freq;
  50         unsigned long lp_freq;
  51         bool unused;
  52
  53         void __iomem *regs;
  54         struct regmap *prcmu;
  55 };
  56
  57 static inline struct mcde_dsi *bridge_to_mcde_dsi(struct drm_bridge *bridge)
  58 {
  59         return container_of(bridge, struct mcde_dsi, bridge);
  60 }
  61
  62 static inline struct mcde_dsi *host_to_mcde_dsi(struct mipi_dsi_host *h)
  63 {
  64         return container_of(h, struct mcde_dsi, dsi_host);
  65 }
  66
  67 static inline struct mcde_dsi *connector_to_mcde_dsi(struct drm_connector *c)
  68 {
  69         return container_of(c, struct mcde_dsi, connector);
  70 }
  71
  72 bool mcde_dsi_irq(struct mipi_dsi_device *mdsi)
  73 {
  74         struct mcde_dsi *d;
  75         u32 val;
  76         bool te_received = false;
  77
  78         d = host_to_mcde_dsi(mdsi->host);
  79
  80         dev_dbg(d->dev, "%s called\n", __func__);
  81
  82         val = readl(d->regs + DSI_DIRECT_CMD_STS_FLAG);
  83         if (val)
  84                 dev_dbg(d->dev, "DSI_DIRECT_CMD_STS_FLAG = %08x\n", val);
  85         if (val & DSI_DIRECT_CMD_STS_WRITE_COMPLETED)
  86                 dev_dbg(d->dev, "direct command write completed\n");
  87         if (val & DSI_DIRECT_CMD_STS_TE_RECEIVED) {
  88                 te_received = true;
  89                 dev_dbg(d->dev, "direct command TE received\n");
  90         }
  91         if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED)
  92                 dev_err(d->dev, "direct command ACK ERR received\n");
  93         if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR)
  94                 dev_err(d->dev, "direct command read ERR received\n");
  95         /* Mask off the ACK value and clear status */
  96         writel(val, d->regs + DSI_DIRECT_CMD_STS_CLR);
  97
  98         val = readl(d->regs + DSI_CMD_MODE_STS_FLAG);
  99         if (val)
 100                 dev_dbg(d->dev, "DSI_CMD_MODE_STS_FLAG = %08x\n", val);
 101         if (val & DSI_CMD_MODE_STS_ERR_NO_TE)
 102                 /* This happens all the time (safe to ignore) */
 103                 dev_dbg(d->dev, "CMD mode no TE\n");
 104         if (val & DSI_CMD_MODE_STS_ERR_TE_MISS)
 105                 /* This happens all the time (safe to ignore) */
 106                 dev_dbg(d->dev, "CMD mode TE miss\n");
 107         if (val & DSI_CMD_MODE_STS_ERR_SDI1_UNDERRUN)
 108                 dev_err(d->dev, "CMD mode SD1 underrun\n");
 109         if (val & DSI_CMD_MODE_STS_ERR_SDI2_UNDERRUN)
 110                 dev_err(d->dev, "CMD mode SD2 underrun\n");
 111         if (val & DSI_CMD_MODE_STS_ERR_UNWANTED_RD)
 112                 dev_err(d->dev, "CMD mode unwanted RD\n");
 113         writel(val, d->regs + DSI_CMD_MODE_STS_CLR);
 114
 115         val = readl(d->regs + DSI_DIRECT_CMD_RD_STS_FLAG);
 116         if (val)
 117                 dev_dbg(d->dev, "DSI_DIRECT_CMD_RD_STS_FLAG = %08x\n", val);
 118         writel(val, d->regs + DSI_DIRECT_CMD_RD_STS_CLR);
 119
 120         val = readl(d->regs + DSI_TG_STS_FLAG);
 121         if (val)
 122                 dev_dbg(d->dev, "DSI_TG_STS_FLAG = %08x\n", val);
 123         writel(val, d->regs + DSI_TG_STS_CLR);
 124
 125         val = readl(d->regs + DSI_VID_MODE_STS_FLAG);
 126         if (val)
 127                 dev_err(d->dev, "some video mode error status\n");
 128         writel(val, d->regs + DSI_VID_MODE_STS_CLR);
 129
 130         return te_received;
 131 }
 132
 133 static int mcde_dsi_host_attach(struct mipi_dsi_host *host,
 134                                 struct mipi_dsi_device *mdsi)
 135 {
 136         struct mcde_dsi *d = host_to_mcde_dsi(host);
 137
 138         if (mdsi->lanes < 1 || mdsi->lanes > 2) {
 139                 DRM_ERROR("dsi device params invalid, 1 or 2 lanes supported\n");
 140                 return -EINVAL;
 141         }
 142
 143         dev_info(d->dev, "attached DSI device with %d lanes\n", mdsi->lanes);
 144         /* MIPI_DSI_FMT_RGB88 etc */
 145         dev_info(d->dev, "format %08x, %dbpp\n", mdsi->format,
 146                  mipi_dsi_pixel_format_to_bpp(mdsi->format));
 147         dev_info(d->dev, "mode flags: %08lx\n", mdsi->mode_flags);
 148
 149         d->mdsi = mdsi;
 150         if (d->mcde)
 151                 d->mcde->mdsi = mdsi;
 152
 153         return 0;
 154 }
 155
 156 static int mcde_dsi_host_detach(struct mipi_dsi_host *host,
 157                                 struct mipi_dsi_device *mdsi)
 158 {
 159         struct mcde_dsi *d = host_to_mcde_dsi(host);
 160
 161         d->mdsi = NULL;
 162         if (d->mcde)
 163                 d->mcde->mdsi = NULL;
 164
 165         return 0;
 166 }
 167
 168 #define MCDE_DSI_HOST_IS_READ(type)                         \
 169         ((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \
 170          (type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \
 171          (type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
 172          (type == MIPI_DSI_DCS_READ))
 173
 174 static ssize_t mcde_dsi_host_transfer(struct mipi_dsi_host *host,
 175                                       const struct mipi_dsi_msg *msg)
 176 {
 177         struct mcde_dsi *d = host_to_mcde_dsi(host);
 178         const u32 loop_delay_us = 10; /* us */
 179         const u8 *tx = msg->tx_buf;
 180         u32 loop_counter;
 181         size_t txlen = msg->tx_len;
 182         size_t rxlen = msg->rx_len;
 183         u32 val;
 184         int ret;
 185         int i;
 186
 187         if (txlen > 16) {
 188                 dev_err(d->dev,
 189                         "dunno how to write more than 16 bytes yet\n");
 190                 return -EIO;
 191         }
 192         if (rxlen > 4) {
 193                 dev_err(d->dev,
 194                         "dunno how to read more than 4 bytes yet\n");
 195                 return -EIO;
 196         }
 197
 198         dev_dbg(d->dev,
 199                 "message to channel %d, write %zd bytes read %zd bytes\n",
 200                 msg->channel, txlen, rxlen);
 201
 202         /* Command "nature" */
 203         if (MCDE_DSI_HOST_IS_READ(msg->type))
 204                 /* MCTL_MAIN_DATA_CTL already set up */
 205                 val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_READ;
 206         else
 207                 val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_WRITE;
 208         /*
 209          * More than 2 bytes will not fit in a single packet, so it's
 210          * time to set the "long not short" bit. One byte is used by
 211          * the MIPI DCS command leaving just one byte for the payload
 212          * in a short package.
 213          */
 214         if (mipi_dsi_packet_format_is_long(msg->type))
 215                 val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LONGNOTSHORT;
 216         val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT;
 217         val |= txlen << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT;
 218         val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN;
 219         val |= msg->type << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT;
 220         writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS);
 221
 222         /* MIPI DCS command is part of the data */
 223         if (txlen > 0) {
 224                 val = 0;
 225                 for (i = 0; i < 4 && i < txlen; i++)
 226                         val |= tx[i] << (i & 3) * 8;
 227         }
 228         writel(val, d->regs + DSI_DIRECT_CMD_WRDAT0);
 229         if (txlen > 4) {
 230                 val = 0;
 231                 for (i = 0; i < 4 && (i + 4) < txlen; i++)
 232                         val |= tx[i + 4] << (i & 3) * 8;
 233                 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT1);
 234         }
 235         if (txlen > 8) {
 236                 val = 0;
 237                 for (i = 0; i < 4 && (i + 8) < txlen; i++)
 238                         val |= tx[i + 8] << (i & 3) * 8;
 239                 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT2);
 240         }
 241         if (txlen > 12) {
 242                 val = 0;
 243                 for (i = 0; i < 4 && (i + 12) < txlen; i++)
 244                         val |= tx[i + 12] << (i & 3) * 8;
 245                 writel(val, d->regs + DSI_DIRECT_CMD_WRDAT3);
 246         }
 247
 248         writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR);
 249         writel(~0, d->regs + DSI_CMD_MODE_STS_CLR);
 250         /* Send command */
 251         writel(1, d->regs + DSI_DIRECT_CMD_SEND);
 252
 253         loop_counter = 1000 * 1000 / loop_delay_us;
 254         if (MCDE_DSI_HOST_IS_READ(msg->type)) {
 255                 /* Read command */
 256                 while (!(readl(d->regs + DSI_DIRECT_CMD_STS) &
 257                          (DSI_DIRECT_CMD_STS_READ_COMPLETED |
 258                           DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR))
 259                        && --loop_counter)
 260                         usleep_range(loop_delay_us, (loop_delay_us * 3) / 2);
 261                 if (!loop_counter) {
 262                         dev_err(d->dev, "DSI read timeout!\n");
 263                         return -ETIME;
 264                 }
 265         } else {
 266                 /* Writing only */
 267                 while (!(readl(d->regs + DSI_DIRECT_CMD_STS) &
 268                          DSI_DIRECT_CMD_STS_WRITE_COMPLETED)
 269                        && --loop_counter)
 270                         usleep_range(loop_delay_us, (loop_delay_us * 3) / 2);
 271
 272                 if (!loop_counter) {
 273                         dev_err(d->dev, "DSI write timeout!\n");
 274                         return -ETIME;
 275                 }
 276         }
 277
 278         val = readl(d->regs + DSI_DIRECT_CMD_STS);
 279         if (val & DSI_DIRECT_CMD_STS_READ_COMPLETED_WITH_ERR) {
 280                 dev_err(d->dev, "read completed with error\n");
 281                 writel(1, d->regs + DSI_DIRECT_CMD_RD_INIT);
 282                 return -EIO;
 283         }
 284         if (val & DSI_DIRECT_CMD_STS_ACKNOWLEDGE_WITH_ERR_RECEIVED) {
 285                 val >>= DSI_DIRECT_CMD_STS_ACK_VAL_SHIFT;
 286                 dev_err(d->dev, "error during transmission: %04x\n",
 287                         val);
 288                 return -EIO;
 289         }
 290
 291         if (!MCDE_DSI_HOST_IS_READ(msg->type)) {
 292                 /* Return number of bytes written */
 293                 ret = txlen;
 294         } else {
 295                 /* OK this is a read command, get the response */
 296                 u32 rdsz;
 297                 u32 rddat;
 298                 u8 *rx = msg->rx_buf;
 299
 300                 rdsz = readl(d->regs + DSI_DIRECT_CMD_RD_PROPERTY);
 301                 rdsz &= DSI_DIRECT_CMD_RD_PROPERTY_RD_SIZE_MASK;
 302                 rddat = readl(d->regs + DSI_DIRECT_CMD_RDDAT);
 303                 if (rdsz < rxlen) {
 304                         dev_err(d->dev, "read error, requested %zd got %d\n",
 305                                 rxlen, rdsz);
 306                         return -EIO;
 307                 }
 308                 /* FIXME: read more than 4 bytes */
 309                 for (i = 0; i < 4 && i < rxlen; i++)
 310                         rx[i] = (rddat >> (i * 8)) & 0xff;
 311                 ret = rdsz;
 312         }
 313
 314         writel(~0, d->regs + DSI_DIRECT_CMD_STS_CLR);
 315         writel(~0, d->regs + DSI_CMD_MODE_STS_CLR);
 316
 317         return ret;
 318 }
 319
 320 static const struct mipi_dsi_host_ops mcde_dsi_host_ops = {
 321         .attach = mcde_dsi_host_attach,
 322         .detach = mcde_dsi_host_detach,
 323         .transfer = mcde_dsi_host_transfer,
 324 };
 325
 326 /* This sends a direct (short) command to request TE */
 327 void mcde_dsi_te_request(struct mipi_dsi_device *mdsi)
 328 {
 329         struct mcde_dsi *d;
 330         u32 val;
 331
 332         d = host_to_mcde_dsi(mdsi->host);
 333
 334         /* Command "nature" TE request */
 335         val = DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_NAT_TE_REQ;
 336         val |= 0 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_ID_SHIFT;
 337         val |= 2 << DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_SIZE_SHIFT;
 338         val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_LP_EN;
 339         val |= DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_DCS_SHORT_WRITE_1 <<
 340                 DSI_DIRECT_CMD_MAIN_SETTINGS_CMD_HEAD_SHIFT;
 341         writel(val, d->regs + DSI_DIRECT_CMD_MAIN_SETTINGS);
 342
 343         /* Clear TE reveived and error status bits and enables them */
 344         writel(DSI_DIRECT_CMD_STS_CLR_TE_RECEIVED_CLR |
 345                DSI_DIRECT_CMD_STS_CLR_ACKNOWLEDGE_WITH_ERR_RECEIVED_CLR,
 346                d->regs + DSI_DIRECT_CMD_STS_CLR);
 347         val = readl(d->regs + DSI_DIRECT_CMD_STS_CTL);
 348         val |= DSI_DIRECT_CMD_STS_CTL_TE_RECEIVED_EN;
 349         val |= DSI_DIRECT_CMD_STS_CTL_ACKNOWLEDGE_WITH_ERR_EN;
 350         writel(val, d->regs + DSI_DIRECT_CMD_STS_CTL);
 351
 352         /* Clear and enable no TE or TE missing status */
 353         writel(DSI_CMD_MODE_STS_CLR_ERR_NO_TE_CLR |
 354                DSI_CMD_MODE_STS_CLR_ERR_TE_MISS_CLR,
 355                d->regs + DSI_CMD_MODE_STS_CLR);
 356         val = readl(d->regs + DSI_CMD_MODE_STS_CTL);
 357         val |= DSI_CMD_MODE_STS_CTL_ERR_NO_TE_EN;
 358         val |= DSI_CMD_MODE_STS_CTL_ERR_TE_MISS_EN;
 359         writel(val, d->regs + DSI_CMD_MODE_STS_CTL);
 360
 361         /* Send this TE request command */
 362         writel(1, d->regs + DSI_DIRECT_CMD_SEND);
 363 }
 364
 365 static void mcde_dsi_setup_video_mode(struct mcde_dsi *d,
 366                                       const struct drm_display_mode *mode)
 367 {
 368         u8 bpp = mipi_dsi_pixel_format_to_bpp(d->mdsi->format);
 369         u64 bpl;
 370         u32 hfp;
 371         u32 hbp;
 372         u32 hsa;
 373         u32 blkline_pck, line_duration;
 374         u32 blkeol_pck, blkeol_duration;
 375         u32 val;
 376
 377         val = 0;
 378         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
 379                 val |= DSI_VID_MAIN_CTL_BURST_MODE;
 380         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
 381                 val |= DSI_VID_MAIN_CTL_SYNC_PULSE_ACTIVE;
 382                 val |= DSI_VID_MAIN_CTL_SYNC_PULSE_HORIZONTAL;
 383         }
 384         /* RGB header and pixel mode */
 385         switch (d->mdsi->format) {
 386         case MIPI_DSI_FMT_RGB565:
 387                 val |= MIPI_DSI_PACKED_PIXEL_STREAM_16 <<
 388                         DSI_VID_MAIN_CTL_HEADER_SHIFT;
 389                 val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_16BITS;
 390                 break;
 391         case MIPI_DSI_FMT_RGB666_PACKED:
 392                 val |= MIPI_DSI_PACKED_PIXEL_STREAM_18 <<
 393                         DSI_VID_MAIN_CTL_HEADER_SHIFT;
 394                 val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_18BITS;
 395                 break;
 396         case MIPI_DSI_FMT_RGB666:
 397                 val |= MIPI_DSI_PIXEL_STREAM_3BYTE_18
 398                         << DSI_VID_MAIN_CTL_HEADER_SHIFT;
 399                 val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_18BITS_LOOSE;
 400                 break;
 401         case MIPI_DSI_FMT_RGB888:
 402                 val |= MIPI_DSI_PACKED_PIXEL_STREAM_24 <<
 403                         DSI_VID_MAIN_CTL_HEADER_SHIFT;
 404                 val |= DSI_VID_MAIN_CTL_VID_PIXEL_MODE_24BITS;
 405                 break;
 406         default:
 407                 dev_err(d->dev, "unknown pixel mode\n");
 408                 return;
 409         }
 410
 411         /* TODO: TVG could be enabled here */
 412
 413         /* Send blanking packet */
 414         val |= DSI_VID_MAIN_CTL_REG_BLKLINE_MODE_LP_0;
 415         /* Send EOL packet */
 416         val |= DSI_VID_MAIN_CTL_REG_BLKEOL_MODE_LP_0;
 417         /* Recovery mode 1 */
 418         val |= 1 << DSI_VID_MAIN_CTL_RECOVERY_MODE_SHIFT;
 419         /* All other fields zero */
 420         writel(val, d->regs + DSI_VID_MAIN_CTL);
 421
 422         /* Vertical frame parameters are pretty straight-forward */
 423         val = mode->vdisplay << DSI_VID_VSIZE_VSA_LENGTH_SHIFT;
 424         /* vertical front porch */
 425         val |= (mode->vsync_start - mode->vdisplay)
 426                 << DSI_VID_VSIZE_VFP_LENGTH_SHIFT;
 427         /* vertical sync active */
 428         val |= (mode->vsync_end - mode->vsync_start)
 429                 << DSI_VID_VSIZE_VACT_LENGTH_SHIFT;
 430         /* vertical back porch */
 431         val |= (mode->vtotal - mode->vsync_end)
 432                 << DSI_VID_VSIZE_VBP_LENGTH_SHIFT;
 433         writel(val, d->regs + DSI_VID_VSIZE);
 434
 435         /*
 436          * Horizontal frame parameters:
 437          * horizontal resolution is given in pixels and must be re-calculated
 438          * into bytes since this is what the hardware expects.
 439          *
 440          * 6 + 2 is HFP header + checksum
 441          */
 442         hfp = (mode->hsync_start - mode->hdisplay) * bpp - 6 - 2;
 443         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
 444                 /*
 445                  * 6 is HBP header + checksum
 446                  * 4 is RGB header + checksum
 447                  */
 448                 hbp = (mode->htotal - mode->hsync_end) * bpp - 4 - 6;
 449                 /*
 450                  * 6 is HBP header + checksum
 451                  * 4 is HSW packet bytes
 452                  * 4 is RGB header + checksum
 453                  */
 454                 hsa = (mode->hsync_end - mode->hsync_start) * bpp - 4 - 4 - 6;
 455         } else {
 456                 /*
 457                  * HBP includes both back porch and sync
 458                  * 6 is HBP header + checksum
 459                  * 4 is HSW packet bytes
 460                  * 4 is RGB header + checksum
 461                  */
 462                 hbp = (mode->htotal - mode->hsync_start) * bpp - 4 - 4 - 6;
 463                 /* HSA is not considered in this mode and set to 0 */
 464                 hsa = 0;
 465         }
 466         dev_dbg(d->dev, "hfp: %u, hbp: %u, hsa: %u\n",
 467                 hfp, hbp, hsa);
 468
 469         /* Frame parameters: horizontal sync active */
 470         val = hsa << DSI_VID_HSIZE1_HSA_LENGTH_SHIFT;
 471         /* horizontal back porch */
 472         val |= hbp << DSI_VID_HSIZE1_HBP_LENGTH_SHIFT;
 473         /* horizontal front porch */
 474         val |= hfp << DSI_VID_HSIZE1_HFP_LENGTH_SHIFT;
 475         writel(val, d->regs + DSI_VID_HSIZE1);
 476
 477         /* RGB data length (bytes on one scanline) */
 478         val = mode->hdisplay * (bpp / 8);
 479         writel(val, d->regs + DSI_VID_HSIZE2);
 480
 481         /* TODO: further adjustments for TVG mode here */
 482
 483         /*
 484          * EOL packet length from bits per line calculations: pixel clock
 485          * is given in kHz, calculate the time between two pixels in
 486          * picoseconds.
 487          */
 488         bpl = mode->clock * mode->htotal;
 489         bpl *= (d->hs_freq / 8);
 490         do_div(bpl, 1000000); /* microseconds */
 491         do_div(bpl, 1000000); /* seconds */
 492         bpl *= d->mdsi->lanes;
 493         dev_dbg(d->dev, "calculated bytes per line: %llu\n", bpl);
 494         /*
 495          * 6 is header + checksum, header = 4 bytes, checksum = 2 bytes
 496          * 4 is short packet for vsync/hsync
 497          */
 498         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
 499                 /* Fixme: isn't the hsync width in pixels? */
 500                 blkline_pck = bpl - (mode->hsync_end - mode->hsync_start) - 6;
 501                 val = blkline_pck << DSI_VID_BLKSIZE2_BLKLINE_PULSE_PCK_SHIFT;
 502                 writel(val, d->regs + DSI_VID_BLKSIZE2);
 503         } else {
 504                 blkline_pck = bpl - 4 - 6;
 505                 val = blkline_pck << DSI_VID_BLKSIZE1_BLKLINE_EVENT_PCK_SHIFT;
 506                 writel(val, d->regs + DSI_VID_BLKSIZE1);
 507         }
 508
 509         line_duration = (blkline_pck + 6) / d->mdsi->lanes;
 510         dev_dbg(d->dev, "line duration %u\n", line_duration);
 511         val = line_duration << DSI_VID_DPHY_TIME_REG_LINE_DURATION_SHIFT;
 512         /*
 513          * This is the time to perform LP->HS on D-PHY
 514          * FIXME: nowhere to get this from: DT property on the DSI?
 515          */
 516         val |= 0 << DSI_VID_DPHY_TIME_REG_WAKEUP_TIME_SHIFT;
 517         writel(val, d->regs + DSI_VID_DPHY_TIME);
 518
 519         /* Calculate block end of line */
 520         blkeol_pck = bpl - mode->hdisplay * bpp - 6;
 521         blkeol_duration = (blkeol_pck + 6) / d->mdsi->lanes;
 522         dev_dbg(d->dev, "blkeol pck: %u, duration: %u\n",
 523                  blkeol_pck, blkeol_duration);
 524
 525         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
 526                 /* Set up EOL clock for burst mode */
 527                 val = readl(d->regs + DSI_VID_BLKSIZE1);
 528                 val |= blkeol_pck << DSI_VID_BLKSIZE1_BLKEOL_PCK_SHIFT;
 529                 writel(val, d->regs + DSI_VID_BLKSIZE1);
 530                 writel(blkeol_pck, d->regs + DSI_VID_VCA_SETTING2);
 531
 532                 writel(blkeol_duration, d->regs + DSI_VID_PCK_TIME);
 533                 writel(blkeol_duration - 6, d->regs + DSI_VID_VCA_SETTING1);
 534         }
 535
 536         /* Maximum line limit */
 537         val = readl(d->regs + DSI_VID_VCA_SETTING2);
 538         val |= blkline_pck <<
 539                 DSI_VID_VCA_SETTING2_EXACT_BURST_LIMIT_SHIFT;
 540         writel(val, d->regs + DSI_VID_VCA_SETTING2);
 541
 542         /* Put IF1 into video mode */
 543         val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL);
 544         val |= DSI_MCTL_MAIN_DATA_CTL_IF1_MODE;
 545         writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);
 546
 547         /* Disable command mode on IF1 */
 548         val = readl(d->regs + DSI_CMD_MODE_CTL);
 549         val &= ~DSI_CMD_MODE_CTL_IF1_LP_EN;
 550         writel(val, d->regs + DSI_CMD_MODE_CTL);
 551
 552         /* Enable some error interrupts */
 553         val = readl(d->regs + DSI_VID_MODE_STS_CTL);
 554         val |= DSI_VID_MODE_STS_CTL_ERR_MISSING_VSYNC;
 555         val |= DSI_VID_MODE_STS_CTL_ERR_MISSING_DATA;
 556         writel(val, d->regs + DSI_VID_MODE_STS_CTL);
 557
 558         /* Enable video mode */
 559         val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL);
 560         val |= DSI_MCTL_MAIN_DATA_CTL_VID_EN;
 561         writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);
 562 }
 563
 564 static void mcde_dsi_start(struct mcde_dsi *d)
 565 {
 566         unsigned long hs_freq;
 567         u32 val;
 568         int i;
 569
 570         /* No integration mode */
 571         writel(0, d->regs + DSI_MCTL_INTEGRATION_MODE);
 572
 573         /* Enable the DSI port, from drivers/video/mcde/dsilink_v2.c */
 574         val = DSI_MCTL_MAIN_DATA_CTL_LINK_EN |
 575                 DSI_MCTL_MAIN_DATA_CTL_BTA_EN |
 576                 DSI_MCTL_MAIN_DATA_CTL_READ_EN |
 577                 DSI_MCTL_MAIN_DATA_CTL_REG_TE_EN;
 578         if (d->mdsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET)
 579                 val |= DSI_MCTL_MAIN_DATA_CTL_HOST_EOT_GEN;
 580         writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);
 581
 582         /* Set a high command timeout, clear other fields */
 583         val = 0x3ff << DSI_CMD_MODE_CTL_TE_TIMEOUT_SHIFT;
 584         writel(val, d->regs + DSI_CMD_MODE_CTL);
 585
 586         /*
 587          * UI_X4 is described as "unit interval times four"
 588          * I guess since DSI packets are 4 bytes wide, one unit
 589          * is one byte.
 590          */
 591         hs_freq = clk_get_rate(d->hs_clk);
 592         hs_freq /= 1000000; /* MHz */
 593         val = 4000 / hs_freq;
 594         dev_dbg(d->dev, "UI value: %d\n", val);
 595         val <<= DSI_MCTL_DPHY_STATIC_UI_X4_SHIFT;
 596         val &= DSI_MCTL_DPHY_STATIC_UI_X4_MASK;
 597         writel(val, d->regs + DSI_MCTL_DPHY_STATIC);
 598
 599         /*
 600          * Enable clocking: 0x0f (something?) between each burst,
 601          * enable the second lane if needed, enable continuous clock if
 602          * needed, enable switch into ULPM (ultra-low power mode) on
 603          * all the lines.
 604          */
 605         val = 0x0f << DSI_MCTL_MAIN_PHY_CTL_WAIT_BURST_TIME_SHIFT;
 606         if (d->mdsi->lanes == 2)
 607                 val |= DSI_MCTL_MAIN_PHY_CTL_LANE2_EN;
 608         if (!(d->mdsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
 609                 val |= DSI_MCTL_MAIN_PHY_CTL_CLK_CONTINUOUS;
 610         val |= DSI_MCTL_MAIN_PHY_CTL_CLK_ULPM_EN |
 611                 DSI_MCTL_MAIN_PHY_CTL_DAT1_ULPM_EN |
 612                 DSI_MCTL_MAIN_PHY_CTL_DAT2_ULPM_EN;
 613         writel(val, d->regs + DSI_MCTL_MAIN_PHY_CTL);
 614
 615         val = (1 << DSI_MCTL_ULPOUT_TIME_CKLANE_ULPOUT_TIME_SHIFT) |
 616                 (1 << DSI_MCTL_ULPOUT_TIME_DATA_ULPOUT_TIME_SHIFT);
 617         writel(val, d->regs + DSI_MCTL_ULPOUT_TIME);
 618
 619         writel(DSI_DPHY_LANES_TRIM_DPHY_SPECS_90_81B_0_90,
 620                d->regs + DSI_DPHY_LANES_TRIM);
 621
 622         /* High PHY timeout */
 623         val = (0x0f << DSI_MCTL_DPHY_TIMEOUT_CLK_DIV_SHIFT) |
 624                 (0x3fff << DSI_MCTL_DPHY_TIMEOUT_HSTX_TO_VAL_SHIFT) |
 625                 (0x3fff << DSI_MCTL_DPHY_TIMEOUT_LPRX_TO_VAL_SHIFT);
 626         writel(val, d->regs + DSI_MCTL_DPHY_TIMEOUT);
 627
 628         val = DSI_MCTL_MAIN_EN_PLL_START |
 629                 DSI_MCTL_MAIN_EN_CKLANE_EN |
 630                 DSI_MCTL_MAIN_EN_DAT1_EN |
 631                 DSI_MCTL_MAIN_EN_IF1_EN;
 632         if (d->mdsi->lanes == 2)
 633                 val |= DSI_MCTL_MAIN_EN_DAT2_EN;
 634         writel(val, d->regs + DSI_MCTL_MAIN_EN);
 635
 636         /* Wait for the PLL to lock and the clock and data lines to come up */
 637         i = 0;
 638         val = DSI_MCTL_MAIN_STS_PLL_LOCK |
 639                 DSI_MCTL_MAIN_STS_CLKLANE_READY |
 640                 DSI_MCTL_MAIN_STS_DAT1_READY;
 641         if (d->mdsi->lanes == 2)
 642                 val |= DSI_MCTL_MAIN_STS_DAT2_READY;
 643         while ((readl(d->regs + DSI_MCTL_MAIN_STS) & val) != val) {
 644                 /* Sleep for a millisecond */
 645                 usleep_range(1000, 1500);
 646                 if (i++ == 100) {
 647                         dev_warn(d->dev, "DSI lanes did not start up\n");
 648                         return;
 649                 }
 650         }
 651
 652         /* TODO needed? */
 653
 654         /* Command mode, clear IF1 ID */
 655         val = readl(d->regs + DSI_CMD_MODE_CTL);
 656         /*
 657          * If we enable low-power mode here, with
 658          * val |= DSI_CMD_MODE_CTL_IF1_LP_EN
 659          * then display updates become really slow.
 660          */
 661         val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK;
 662         writel(val, d->regs + DSI_CMD_MODE_CTL);
 663
 664         /* Wait for DSI PHY to initialize */
 665         usleep_range(100, 200);
 666         dev_info(d->dev, "DSI link enabled\n");
 667 }
 668
 669
 670 static void mcde_dsi_bridge_enable(struct drm_bridge *bridge)
 671 {
 672         struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
 673
 674         dev_info(d->dev, "enable DSI master\n");
 675 };
 676
 677 static void mcde_dsi_bridge_mode_set(struct drm_bridge *bridge,
 678                                      const struct drm_display_mode *mode,
 679                                      const struct drm_display_mode *adj)
 680 {
 681         struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
 682         unsigned long pixel_clock_hz = mode->clock * 1000;
 683         unsigned long hs_freq, lp_freq;
 684         u32 val;
 685         int ret;
 686
 687         if (!d->mdsi) {
 688                 dev_err(d->dev, "no DSI device attached to encoder!\n");
 689                 return;
 690         }
 691
 692         dev_info(d->dev, "set DSI master to %dx%d %lu Hz %s mode\n",
 693                  mode->hdisplay, mode->vdisplay, pixel_clock_hz,
 694                  (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) ? "VIDEO" : "CMD"
 695                 );
 696
 697         /* Copy maximum clock frequencies */
 698         if (d->mdsi->lp_rate)
 699                 lp_freq = d->mdsi->lp_rate;
 700         else
 701                 lp_freq = DSI_DEFAULT_LP_FREQ_HZ;
 702         if (d->mdsi->hs_rate)
 703                 hs_freq = d->mdsi->hs_rate;
 704         else
 705                 hs_freq = DSI_DEFAULT_HS_FREQ_HZ;
 706
 707         /* Enable LP (Low Power, Energy Save, ES) and HS (High Speed) clocks */
 708         d->lp_freq = clk_round_rate(d->lp_clk, lp_freq);
 709         ret = clk_set_rate(d->lp_clk, d->lp_freq);
 710         if (ret)
 711                 dev_err(d->dev, "failed to set LP clock rate %lu Hz\n",
 712                         d->lp_freq);
 713
 714         d->hs_freq = clk_round_rate(d->hs_clk, hs_freq);
 715         ret = clk_set_rate(d->hs_clk, d->hs_freq);
 716         if (ret)
 717                 dev_err(d->dev, "failed to set HS clock rate %lu Hz\n",
 718                         d->hs_freq);
 719
 720         /* Start clocks */
 721         ret = clk_prepare_enable(d->lp_clk);
 722         if (ret)
 723                 dev_err(d->dev, "failed to enable LP clock\n");
 724         else
 725                 dev_info(d->dev, "DSI LP clock rate %lu Hz\n",
 726                          d->lp_freq);
 727         ret = clk_prepare_enable(d->hs_clk);
 728         if (ret)
 729                 dev_err(d->dev, "failed to enable HS clock\n");
 730         else
 731                 dev_info(d->dev, "DSI HS clock rate %lu Hz\n",
 732                          d->hs_freq);
 733
 734         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
 735                 mcde_dsi_setup_video_mode(d, mode);
 736         } else {
 737                 /* Command mode, clear IF1 ID */
 738                 val = readl(d->regs + DSI_CMD_MODE_CTL);
 739                 /*
 740                  * If we enable low-power mode here with
 741                  * val |= DSI_CMD_MODE_CTL_IF1_LP_EN
 742                  * the display updates become really slow.
 743                  */
 744                 val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK;
 745                 writel(val, d->regs + DSI_CMD_MODE_CTL);
 746         }
 747 }
 748
 749 static void mcde_dsi_wait_for_command_mode_stop(struct mcde_dsi *d)
 750 {
 751         u32 val;
 752         int i;
 753
 754         /*
 755          * Wait until we get out of command mode
 756          * CSM = Command State Machine
 757          */
 758         i = 0;
 759         val = DSI_CMD_MODE_STS_CSM_RUNNING;
 760         while ((readl(d->regs + DSI_CMD_MODE_STS) & val) == val) {
 761                 /* Sleep for a millisecond */
 762                 usleep_range(1000, 2000);
 763                 if (i++ == 100) {
 764                         dev_warn(d->dev,
 765                                  "could not get out of command mode\n");
 766                         return;
 767                 }
 768         }
 769 }
 770
 771 static void mcde_dsi_wait_for_video_mode_stop(struct mcde_dsi *d)
 772 {
 773         u32 val;
 774         int i;
 775
 776         /* Wait until we get out og video mode */
 777         i = 0;
 778         val = DSI_VID_MODE_STS_VSG_RUNNING;
 779         while ((readl(d->regs + DSI_VID_MODE_STS) & val) == val) {
 780                 /* Sleep for a millisecond */
 781                 usleep_range(1000, 2000);
 782                 if (i++ == 100) {
 783                         dev_warn(d->dev,
 784                                  "could not get out of video mode\n");
 785                         return;
 786                 }
 787         }
 788 }
 789
 790 static void mcde_dsi_bridge_disable(struct drm_bridge *bridge)
 791 {
 792         struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
 793         u32 val;
 794
 795         /* Disable all error interrupts */
 796         writel(0, d->regs + DSI_VID_MODE_STS_CTL);
 797
 798         if (d->mdsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
 799                 /* Stop video mode */
 800                 val = readl(d->regs + DSI_MCTL_MAIN_DATA_CTL);
 801                 val &= ~DSI_MCTL_MAIN_DATA_CTL_VID_EN;
 802                 writel(val, d->regs + DSI_MCTL_MAIN_DATA_CTL);
 803                 mcde_dsi_wait_for_video_mode_stop(d);
 804         } else {
 805                 /* Stop command mode */
 806                 mcde_dsi_wait_for_command_mode_stop(d);
 807         }
 808
 809         /* Stop clocks */
 810         clk_disable_unprepare(d->hs_clk);
 811         clk_disable_unprepare(d->lp_clk);
 812 }
 813
 814 /*
 815  * This connector needs no special handling, just use the default
 816  * helpers for everything. It's pretty dummy.
 817  */
 818 static const struct drm_connector_funcs mcde_dsi_connector_funcs = {
 819         .reset = drm_atomic_helper_connector_reset,
 820         .fill_modes = drm_helper_probe_single_connector_modes,
 821         .destroy = drm_connector_cleanup,
 822         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 823         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 824 };
 825
 826 static int mcde_dsi_get_modes(struct drm_connector *connector)
 827 {
 828         struct mcde_dsi *d = connector_to_mcde_dsi(connector);
 829
 830         /* Just pass the question to the panel */
 831         if (d->panel)
 832                 return drm_panel_get_modes(d->panel);
 833
 834         /* TODO: deal with bridges */
 835
 836         return 0;
 837 }
 838
 839 static const struct drm_connector_helper_funcs
 840 mcde_dsi_connector_helper_funcs = {
 841         .get_modes = mcde_dsi_get_modes,
 842 };
 843
 844 static int mcde_dsi_bridge_attach(struct drm_bridge *bridge)
 845 {
 846         struct mcde_dsi *d = bridge_to_mcde_dsi(bridge);
 847         struct drm_device *drm = bridge->dev;
 848         int ret;
 849
 850         drm_connector_helper_add(&d->connector,
 851                                  &mcde_dsi_connector_helper_funcs);
 852
 853         if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
 854                 dev_err(d->dev, "we need atomic updates\n");
 855                 return -ENOTSUPP;
 856         }
 857
 858         ret = drm_connector_init(drm, &d->connector,
 859                                  &mcde_dsi_connector_funcs,
 860                                  DRM_MODE_CONNECTOR_DSI);
 861         if (ret) {
 862                 dev_err(d->dev, "failed to initialize DSI bridge connector\n");
 863                 return ret;
 864         }
 865         d->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 866         /* The encoder in the bridge attached to the DSI bridge */
 867         drm_connector_attach_encoder(&d->connector, bridge->encoder);
 868         /* Then we attach the DSI bridge to the output (panel etc) bridge */
 869         ret = drm_bridge_attach(bridge->encoder, d->bridge_out, bridge);
 870         if (ret) {
 871                 dev_err(d->dev, "failed to attach the DSI bridge\n");
 872                 return ret;
 873         }
 874         d->connector.status = connector_status_connected;
 875
 876         return 0;
 877 }
 878
 879 static const struct drm_bridge_funcs mcde_dsi_bridge_funcs = {
 880         .attach = mcde_dsi_bridge_attach,
 881         .mode_set = mcde_dsi_bridge_mode_set,
 882         .disable = mcde_dsi_bridge_disable,
 883         .enable = mcde_dsi_bridge_enable,
 884 };
 885
 886 static int mcde_dsi_bind(struct device *dev, struct device *master,
 887                          void *data)
 888 {
 889         struct drm_device *drm = data;
 890         struct mcde *mcde = drm->dev_private;
 891         struct mcde_dsi *d = dev_get_drvdata(dev);
 892         struct device_node *child;
 893         struct drm_panel *panel = NULL;
 894         struct drm_bridge *bridge = NULL;
 895
 896         if (!of_get_available_child_count(dev->of_node)) {
 897                 dev_info(dev, "unused DSI interface\n");
 898                 d->unused = true;
 899                 return 0;
 900         }
 901         d->mcde = mcde;
 902         /* If the display attached before binding, set this up */
 903         if (d->mdsi)
 904                 d->mcde->mdsi = d->mdsi;
 905
 906         /* Obtain the clocks */
 907         d->hs_clk = devm_clk_get(dev, "hs");
 908         if (IS_ERR(d->hs_clk)) {
 909                 dev_err(dev, "unable to get HS clock\n");
 910                 return PTR_ERR(d->hs_clk);
 911         }
 912
 913         d->lp_clk = devm_clk_get(dev, "lp");
 914         if (IS_ERR(d->lp_clk)) {
 915                 dev_err(dev, "unable to get LP clock\n");
 916                 return PTR_ERR(d->lp_clk);
 917         }
 918
 919         /* Assert RESET through the PRCMU, active low */
 920         /* FIXME: which DSI block? */
 921         regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
 922                            PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0);
 923
 924         usleep_range(100, 200);
 925
 926         /* De-assert RESET again */
 927         regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
 928                            PRCM_DSI_SW_RESET_DSI0_SW_RESETN,
 929                            PRCM_DSI_SW_RESET_DSI0_SW_RESETN);
 930
 931         /* Start up the hardware */
 932         mcde_dsi_start(d);
 933
 934         /* Look for a panel as a child to this node */
 935         for_each_available_child_of_node(dev->of_node, child) {
 936                 panel = of_drm_find_panel(child);
 937                 if (IS_ERR(panel)) {
 938                         dev_err(dev, "failed to find panel try bridge (%lu)\n",
 939                                 PTR_ERR(panel));
 940                         bridge = of_drm_find_bridge(child);
 941                         if (IS_ERR(bridge)) {
 942                                 dev_err(dev, "failed to find bridge (%lu)\n",
 943                                         PTR_ERR(bridge));
 944                                 return PTR_ERR(bridge);
 945                         }
 946                 }
 947         }
 948         if (panel) {
 949                 bridge = drm_panel_bridge_add(panel,
 950                                               DRM_MODE_CONNECTOR_DSI);
 951                 if (IS_ERR(bridge)) {
 952                         dev_err(dev, "error adding panel bridge\n");
 953                         return PTR_ERR(bridge);
 954                 }
 955                 dev_info(dev, "connected to panel\n");
 956                 d->panel = panel;
 957         } else if (bridge) {
 958                 /* TODO: AV8100 HDMI encoder goes here for example */
 959                 dev_info(dev, "connected to non-panel bridge (unsupported)\n");
 960                 return -ENODEV;
 961         } else {
 962                 dev_err(dev, "no panel or bridge\n");
 963                 return -ENODEV;
 964         }
 965
 966         d->bridge_out = bridge;
 967
 968         /* Create a bridge for this DSI channel */
 969         d->bridge.funcs = &mcde_dsi_bridge_funcs;
 970         d->bridge.of_node = dev->of_node;
 971         drm_bridge_add(&d->bridge);
 972
 973         /* TODO: first come first serve, use a list */
 974         mcde->bridge = &d->bridge;
 975
 976         dev_info(dev, "initialized MCDE DSI bridge\n");
 977
 978         return 0;
 979 }
 980
 981 static void mcde_dsi_unbind(struct device *dev, struct device *master,
 982                             void *data)
 983 {
 984         struct mcde_dsi *d = dev_get_drvdata(dev);
 985
 986         if (d->panel)
 987                 drm_panel_bridge_remove(d->bridge_out);
 988         regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
 989                            PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0);
 990 }
 991
 992 static const struct component_ops mcde_dsi_component_ops = {
 993         .bind   = mcde_dsi_bind,
 994         .unbind = mcde_dsi_unbind,
 995 };
 996
 997 static int mcde_dsi_probe(struct platform_device *pdev)
 998 {
 999         struct device *dev = &pdev->dev;
1000         struct mcde_dsi *d;
1001         struct mipi_dsi_host *host;
1002         struct resource *res;
1003         u32 dsi_id;
1004         int ret;
1005
1006         d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
1007         if (!d)
1008                 return -ENOMEM;
1009         d->dev = dev;
1010         platform_set_drvdata(pdev, d);
1011
1012         /* Get a handle on the PRCMU so we can do reset */
1013         d->prcmu =
1014                 syscon_regmap_lookup_by_compatible("stericsson,db8500-prcmu");
1015         if (IS_ERR(d->prcmu)) {
1016                 dev_err(dev, "no PRCMU regmap\n");
1017                 return PTR_ERR(d->prcmu);
1018         }
1019
1020         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1021         d->regs = devm_ioremap_resource(dev, res);
1022         if (IS_ERR(d->regs)) {
1023                 dev_err(dev, "no DSI regs\n");
1024                 return PTR_ERR(d->regs);
1025         }
1026
1027         dsi_id = readl(d->regs + DSI_ID_REG);
1028         dev_info(dev, "HW revision 0x%08x\n", dsi_id);
1029
1030         host = &d->dsi_host;
1031         host->dev = dev;
1032         host->ops = &mcde_dsi_host_ops;
1033         ret = mipi_dsi_host_register(host);
1034         if (ret < 0) {
1035                 dev_err(dev, "failed to register DSI host: %d\n", ret);
1036                 return ret;
1037         }
1038         dev_info(dev, "registered DSI host\n");
1039
1040         platform_set_drvdata(pdev, d);
1041         return component_add(dev, &mcde_dsi_component_ops);
1042 }
1043
1044 static int mcde_dsi_remove(struct platform_device *pdev)
1045 {
1046         struct mcde_dsi *d = platform_get_drvdata(pdev);
1047
1048         component_del(&pdev->dev, &mcde_dsi_component_ops);
1049         mipi_dsi_host_unregister(&d->dsi_host);
1050
1051         return 0;
1052 }
1053
1054 static const struct of_device_id mcde_dsi_of_match[] = {
1055         {
1056                 .compatible = "ste,mcde-dsi",
1057         },
1058         {},
1059 };
1060
1061 struct platform_driver mcde_dsi_driver = {
1062         .driver = {
1063                 .name           = "mcde-dsi",
1064                 .of_match_table = of_match_ptr(mcde_dsi_of_match),
1065         },
1066         .probe = mcde_dsi_probe,
1067         .remove = mcde_dsi_remove,
1068 };