drivers/gpu/drm/i915/intel_dsi_panel_vbt.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Author: Shobhit Kumar <shobhit.kumar@intel.com>
  24  *
  25  */
  26
  27 #include <drm/drmP.h>
  28 #include <drm/drm_crtc.h>
  29 #include <drm/drm_edid.h>
  30 #include <drm/i915_drm.h>
  31 #include <drm/drm_panel.h>
  32 #include <linux/slab.h>
  33 #include <video/mipi_display.h>
  34 #include <asm/intel-mid.h>
  35 #include <video/mipi_display.h>
  36 #include "i915_drv.h"
  37 #include "intel_drv.h"
  38 #include "intel_dsi.h"
  39
  40 struct vbt_panel {
  41         struct drm_panel panel;
  42         struct intel_dsi *intel_dsi;
  43 };
  44
  45 static inline struct vbt_panel *to_vbt_panel(struct drm_panel *panel)
  46 {
  47         return container_of(panel, struct vbt_panel, panel);
  48 }
  49
  50 #define MIPI_TRANSFER_MODE_SHIFT        0
  51 #define MIPI_VIRTUAL_CHANNEL_SHIFT      1
  52 #define MIPI_PORT_SHIFT                 3
  53
  54 #define PREPARE_CNT_MAX         0x3F
  55 #define EXIT_ZERO_CNT_MAX       0x3F
  56 #define CLK_ZERO_CNT_MAX        0xFF
  57 #define TRAIL_CNT_MAX           0x1F
  58
  59 #define NS_KHZ_RATIO 1000000
  60
  61 #define GPI0_NC_0_HV_DDI0_HPD           0x4130
  62 #define GPIO_NC_0_HV_DDI0_PAD           0x4138
  63 #define GPIO_NC_1_HV_DDI0_DDC_SDA       0x4120
  64 #define GPIO_NC_1_HV_DDI0_DDC_SDA_PAD   0x4128
  65 #define GPIO_NC_2_HV_DDI0_DDC_SCL       0x4110
  66 #define GPIO_NC_2_HV_DDI0_DDC_SCL_PAD   0x4118
  67 #define GPIO_NC_3_PANEL0_VDDEN          0x4140
  68 #define GPIO_NC_3_PANEL0_VDDEN_PAD      0x4148
  69 #define GPIO_NC_4_PANEL0_BLKEN          0x4150
  70 #define GPIO_NC_4_PANEL0_BLKEN_PAD      0x4158
  71 #define GPIO_NC_5_PANEL0_BLKCTL         0x4160
  72 #define GPIO_NC_5_PANEL0_BLKCTL_PAD     0x4168
  73 #define GPIO_NC_6_PCONF0                0x4180
  74 #define GPIO_NC_6_PAD                   0x4188
  75 #define GPIO_NC_7_PCONF0                0x4190
  76 #define GPIO_NC_7_PAD                   0x4198
  77 #define GPIO_NC_8_PCONF0                0x4170
  78 #define GPIO_NC_8_PAD                   0x4178
  79 #define GPIO_NC_9_PCONF0                0x4100
  80 #define GPIO_NC_9_PAD                   0x4108
  81 #define GPIO_NC_10_PCONF0               0x40E0
  82 #define GPIO_NC_10_PAD                  0x40E8
  83 #define GPIO_NC_11_PCONF0               0x40F0
  84 #define GPIO_NC_11_PAD                  0x40F8
  85
  86 struct gpio_table {
  87         u16 function_reg;
  88         u16 pad_reg;
  89         u8 init;
  90 };
  91
  92 static struct gpio_table gtable[] = {
  93         { GPI0_NC_0_HV_DDI0_HPD, GPIO_NC_0_HV_DDI0_PAD, 0 },
  94         { GPIO_NC_1_HV_DDI0_DDC_SDA, GPIO_NC_1_HV_DDI0_DDC_SDA_PAD, 0 },
  95         { GPIO_NC_2_HV_DDI0_DDC_SCL, GPIO_NC_2_HV_DDI0_DDC_SCL_PAD, 0 },
  96         { GPIO_NC_3_PANEL0_VDDEN, GPIO_NC_3_PANEL0_VDDEN_PAD, 0 },
  97         { GPIO_NC_4_PANEL0_BLKEN, GPIO_NC_4_PANEL0_BLKEN_PAD, 0 },
  98         { GPIO_NC_5_PANEL0_BLKCTL, GPIO_NC_5_PANEL0_BLKCTL_PAD, 0 },
  99         { GPIO_NC_6_PCONF0, GPIO_NC_6_PAD, 0 },
 100         { GPIO_NC_7_PCONF0, GPIO_NC_7_PAD, 0 },
 101         { GPIO_NC_8_PCONF0, GPIO_NC_8_PAD, 0 },
 102         { GPIO_NC_9_PCONF0, GPIO_NC_9_PAD, 0 },
 103         { GPIO_NC_10_PCONF0, GPIO_NC_10_PAD, 0},
 104         { GPIO_NC_11_PCONF0, GPIO_NC_11_PAD, 0}
 105 };
 106
 107 static inline enum port intel_dsi_seq_port_to_port(u8 port)
 108 {
 109         return port ? PORT_C : PORT_A;
 110 }
 111
 112 static const u8 *mipi_exec_send_packet(struct intel_dsi *intel_dsi,
 113                                        const u8 *data)
 114 {
 115         struct mipi_dsi_device *dsi_device;
 116         u8 type, flags, seq_port;
 117         u16 len;
 118         enum port port;
 119
 120         flags = *data++;
 121         type = *data++;
 122
 123         len = *((u16 *) data);
 124         data += 2;
 125
 126         seq_port = (flags >> MIPI_PORT_SHIFT) & 3;
 127
 128         /* For DSI single link on Port A & C, the seq_port value which is
 129          * parsed from Sequence Block#53 of VBT has been set to 0
 130          * Now, read/write of packets for the DSI single link on Port A and
 131          * Port C will based on the DVO port from VBT block 2.
 132          */
 133         if (intel_dsi->ports == (1 << PORT_C))
 134                 port = PORT_C;
 135         else
 136                 port = intel_dsi_seq_port_to_port(seq_port);
 137
 138         dsi_device = intel_dsi->dsi_hosts[port]->device;
 139         if (!dsi_device) {
 140                 DRM_DEBUG_KMS("no dsi device for port %c\n", port_name(port));
 141                 goto out;
 142         }
 143
 144         if ((flags >> MIPI_TRANSFER_MODE_SHIFT) & 1)
 145                 dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
 146         else
 147                 dsi_device->mode_flags |= MIPI_DSI_MODE_LPM;
 148
 149         dsi_device->channel = (flags >> MIPI_VIRTUAL_CHANNEL_SHIFT) & 3;
 150
 151         switch (type) {
 152         case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
 153                 mipi_dsi_generic_write(dsi_device, NULL, 0);
 154                 break;
 155         case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
 156                 mipi_dsi_generic_write(dsi_device, data, 1);
 157                 break;
 158         case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
 159                 mipi_dsi_generic_write(dsi_device, data, 2);
 160                 break;
 161         case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
 162         case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
 163         case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
 164                 DRM_DEBUG_DRIVER("Generic Read not yet implemented or used\n");
 165                 break;
 166         case MIPI_DSI_GENERIC_LONG_WRITE:
 167                 mipi_dsi_generic_write(dsi_device, data, len);
 168                 break;
 169         case MIPI_DSI_DCS_SHORT_WRITE:
 170                 mipi_dsi_dcs_write_buffer(dsi_device, data, 1);
 171                 break;
 172         case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
 173                 mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
 174                 break;
 175         case MIPI_DSI_DCS_READ:
 176                 DRM_DEBUG_DRIVER("DCS Read not yet implemented or used\n");
 177                 break;
 178         case MIPI_DSI_DCS_LONG_WRITE:
 179                 mipi_dsi_dcs_write_buffer(dsi_device, data, len);
 180                 break;
 181         }
 182
 183 out:
 184         data += len;
 185
 186         return data;
 187 }
 188
 189 static const u8 *mipi_exec_delay(struct intel_dsi *intel_dsi, const u8 *data)
 190 {
 191         u32 delay = *((const u32 *) data);
 192
 193         usleep_range(delay, delay + 10);
 194         data += 4;
 195
 196         return data;
 197 }
 198
 199 static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
 200 {
 201         u8 gpio, action;
 202         u16 function, pad;
 203         u32 val;
 204         struct drm_device *dev = intel_dsi->base.base.dev;
 205         struct drm_i915_private *dev_priv = dev->dev_private;
 206
 207         if (dev_priv->vbt.dsi.seq_version >= 3)
 208                 data++;
 209
 210         gpio = *data++;
 211
 212         /* pull up/down */
 213         action = *data++ & 1;
 214
 215         if (gpio >= ARRAY_SIZE(gtable)) {
 216                 DRM_DEBUG_KMS("unknown gpio %u\n", gpio);
 217                 goto out;
 218         }
 219
 220         if (!IS_VALLEYVIEW(dev_priv)) {
 221                 DRM_DEBUG_KMS("GPIO element not supported on this platform\n");
 222                 goto out;
 223         }
 224
 225         if (dev_priv->vbt.dsi.seq_version >= 3) {
 226                 DRM_DEBUG_KMS("GPIO element v3 not supported\n");
 227                 goto out;
 228         }
 229
 230         function = gtable[gpio].function_reg;
 231         pad = gtable[gpio].pad_reg;
 232
 233         mutex_lock(&dev_priv->sb_lock);
 234         if (!gtable[gpio].init) {
 235                 /* program the function */
 236                 /* FIXME: remove constant below */
 237                 vlv_iosf_sb_write(dev_priv, IOSF_PORT_GPIO_NC, function,
 238                                   0x2000CC00);
 239                 gtable[gpio].init = 1;
 240         }
 241
 242         val = 0x4 | action;
 243
 244         /* pull up/down */
 245         vlv_iosf_sb_write(dev_priv, IOSF_PORT_GPIO_NC, pad, val);
 246         mutex_unlock(&dev_priv->sb_lock);
 247
 248 out:
 249         return data;
 250 }
 251
 252 static const u8 *mipi_exec_i2c_skip(struct intel_dsi *intel_dsi, const u8 *data)
 253 {
 254         return data + *(data + 6) + 7;
 255 }
 256
 257 typedef const u8 * (*fn_mipi_elem_exec)(struct intel_dsi *intel_dsi,
 258                                         const u8 *data);
 259 static const fn_mipi_elem_exec exec_elem[] = {
 260         [MIPI_SEQ_ELEM_SEND_PKT] = mipi_exec_send_packet,
 261         [MIPI_SEQ_ELEM_DELAY] = mipi_exec_delay,
 262         [MIPI_SEQ_ELEM_GPIO] = mipi_exec_gpio,
 263         [MIPI_SEQ_ELEM_I2C] = mipi_exec_i2c_skip,
 264 };
 265
 266 /*
 267  * MIPI Sequence from VBT #53 parsing logic
 268  * We have already separated each seqence during bios parsing
 269  * Following is generic execution function for any sequence
 270  */
 271
 272 static const char * const seq_name[] = {
 273         [MIPI_SEQ_ASSERT_RESET] = "MIPI_SEQ_ASSERT_RESET",
 274         [MIPI_SEQ_INIT_OTP] = "MIPI_SEQ_INIT_OTP",
 275         [MIPI_SEQ_DISPLAY_ON] = "MIPI_SEQ_DISPLAY_ON",
 276         [MIPI_SEQ_DISPLAY_OFF]  = "MIPI_SEQ_DISPLAY_OFF",
 277         [MIPI_SEQ_DEASSERT_RESET] = "MIPI_SEQ_DEASSERT_RESET",
 278         [MIPI_SEQ_BACKLIGHT_ON] = "MIPI_SEQ_BACKLIGHT_ON",
 279         [MIPI_SEQ_BACKLIGHT_OFF] = "MIPI_SEQ_BACKLIGHT_OFF",
 280         [MIPI_SEQ_TEAR_ON] = "MIPI_SEQ_TEAR_ON",
 281         [MIPI_SEQ_TEAR_OFF] = "MIPI_SEQ_TEAR_OFF",
 282         [MIPI_SEQ_POWER_ON] = "MIPI_SEQ_POWER_ON",
 283         [MIPI_SEQ_POWER_OFF] = "MIPI_SEQ_POWER_OFF",
 284 };
 285
 286 static const char *sequence_name(enum mipi_seq seq_id)
 287 {
 288         if (seq_id < ARRAY_SIZE(seq_name) && seq_name[seq_id])
 289                 return seq_name[seq_id];
 290         else
 291                 return "(unknown)";
 292 }
 293
 294 static void generic_exec_sequence(struct drm_panel *panel, enum mipi_seq seq_id)
 295 {
 296         struct vbt_panel *vbt_panel = to_vbt_panel(panel);
 297         struct intel_dsi *intel_dsi = vbt_panel->intel_dsi;
 298         struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
 299         const u8 *data;
 300         fn_mipi_elem_exec mipi_elem_exec;
 301
 302         if (WARN_ON(seq_id >= ARRAY_SIZE(dev_priv->vbt.dsi.sequence)))
 303                 return;
 304
 305         data = dev_priv->vbt.dsi.sequence[seq_id];
 306         if (!data) {
 307                 DRM_DEBUG_KMS("MIPI sequence %d - %s not available\n",
 308                               seq_id, sequence_name(seq_id));
 309                 return;
 310         }
 311
 312         WARN_ON(*data != seq_id);
 313
 314         DRM_DEBUG_KMS("Starting MIPI sequence %d - %s\n",
 315                       seq_id, sequence_name(seq_id));
 316
 317         /* Skip Sequence Byte. */
 318         data++;
 319
 320         /* Skip Size of Sequence. */
 321         if (dev_priv->vbt.dsi.seq_version >= 3)
 322                 data += 4;
 323
 324         while (1) {
 325                 u8 operation_byte = *data++;
 326                 u8 operation_size = 0;
 327
 328                 if (operation_byte == MIPI_SEQ_ELEM_END)
 329                         break;
 330
 331                 if (operation_byte < ARRAY_SIZE(exec_elem))
 332                         mipi_elem_exec = exec_elem[operation_byte];
 333                 else
 334                         mipi_elem_exec = NULL;
 335
 336                 /* Size of Operation. */
 337                 if (dev_priv->vbt.dsi.seq_version >= 3)
 338                         operation_size = *data++;
 339
 340                 if (mipi_elem_exec) {
 341                         data = mipi_elem_exec(intel_dsi, data);
 342                 } else if (operation_size) {
 343                         /* We have size, skip. */
 344                         DRM_DEBUG_KMS("Unsupported MIPI operation byte %u\n",
 345                                       operation_byte);
 346                         data += operation_size;
 347                 } else {
 348                         /* No size, can't skip without parsing. */
 349                         DRM_ERROR("Unsupported MIPI operation byte %u\n",
 350                                   operation_byte);
 351                         return;
 352                 }
 353         }
 354 }
 355
 356 static int vbt_panel_prepare(struct drm_panel *panel)
 357 {
 358         generic_exec_sequence(panel, MIPI_SEQ_ASSERT_RESET);
 359         generic_exec_sequence(panel, MIPI_SEQ_INIT_OTP);
 360
 361         return 0;
 362 }
 363
 364 static int vbt_panel_unprepare(struct drm_panel *panel)
 365 {
 366         generic_exec_sequence(panel, MIPI_SEQ_DEASSERT_RESET);
 367
 368         return 0;
 369 }
 370
 371 static int vbt_panel_enable(struct drm_panel *panel)
 372 {
 373         generic_exec_sequence(panel, MIPI_SEQ_DISPLAY_ON);
 374
 375         return 0;
 376 }
 377
 378 static int vbt_panel_disable(struct drm_panel *panel)
 379 {
 380         generic_exec_sequence(panel, MIPI_SEQ_DISPLAY_OFF);
 381
 382         return 0;
 383 }
 384
 385 static int vbt_panel_get_modes(struct drm_panel *panel)
 386 {
 387         struct vbt_panel *vbt_panel = to_vbt_panel(panel);
 388         struct intel_dsi *intel_dsi = vbt_panel->intel_dsi;
 389         struct drm_device *dev = intel_dsi->base.base.dev;
 390         struct drm_i915_private *dev_priv = dev->dev_private;
 391         struct drm_display_mode *mode;
 392
 393         if (!panel->connector)
 394                 return 0;
 395
 396         mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
 397         if (!mode)
 398                 return 0;
 399
 400         mode->type |= DRM_MODE_TYPE_PREFERRED;
 401
 402         drm_mode_probed_add(panel->connector, mode);
 403
 404         return 1;
 405 }
 406
 407 static const struct drm_panel_funcs vbt_panel_funcs = {
 408         .disable = vbt_panel_disable,
 409         .unprepare = vbt_panel_unprepare,
 410         .prepare = vbt_panel_prepare,
 411         .enable = vbt_panel_enable,
 412         .get_modes = vbt_panel_get_modes,
 413 };
 414
 415 struct drm_panel *vbt_panel_init(struct intel_dsi *intel_dsi, u16 panel_id)
 416 {
 417         struct drm_device *dev = intel_dsi->base.base.dev;
 418         struct drm_i915_private *dev_priv = dev->dev_private;
 419         struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
 420         struct mipi_pps_data *pps = dev_priv->vbt.dsi.pps;
 421         struct drm_display_mode *mode = dev_priv->vbt.lfp_lvds_vbt_mode;
 422         struct vbt_panel *vbt_panel;
 423         u32 bits_per_pixel = 24;
 424         u32 tlpx_ns, extra_byte_count, bitrate, tlpx_ui;
 425         u32 ui_num, ui_den;
 426         u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
 427         u32 ths_prepare_ns, tclk_trail_ns;
 428         u32 tclk_prepare_clkzero, ths_prepare_hszero;
 429         u32 lp_to_hs_switch, hs_to_lp_switch;
 430         u32 pclk, computed_ddr;
 431         u16 burst_mode_ratio;
 432         enum port port;
 433
 434         DRM_DEBUG_KMS("\n");
 435
 436         intel_dsi->eotp_pkt = mipi_config->eot_pkt_disabled ? 0 : 1;
 437         intel_dsi->clock_stop = mipi_config->enable_clk_stop ? 1 : 0;
 438         intel_dsi->lane_count = mipi_config->lane_cnt + 1;
 439         intel_dsi->pixel_format = mipi_config->videomode_color_format << 7;
 440         intel_dsi->dual_link = mipi_config->dual_link;
 441         intel_dsi->pixel_overlap = mipi_config->pixel_overlap;
 442
 443         bits_per_pixel = dsi_pixel_format_bpp(intel_dsi->pixel_format);
 444
 445         intel_dsi->operation_mode = mipi_config->is_cmd_mode;
 446         intel_dsi->video_mode_format = mipi_config->video_transfer_mode;
 447         intel_dsi->escape_clk_div = mipi_config->byte_clk_sel;
 448         intel_dsi->lp_rx_timeout = mipi_config->lp_rx_timeout;
 449         intel_dsi->turn_arnd_val = mipi_config->turn_around_timeout;
 450         intel_dsi->rst_timer_val = mipi_config->device_reset_timer;
 451         intel_dsi->init_count = mipi_config->master_init_timer;
 452         intel_dsi->bw_timer = mipi_config->dbi_bw_timer;
 453         intel_dsi->video_frmt_cfg_bits =
 454                 mipi_config->bta_enabled ? DISABLE_VIDEO_BTA : 0;
 455
 456         pclk = mode->clock;
 457
 458         /* In dual link mode each port needs half of pixel clock */
 459         if (intel_dsi->dual_link) {
 460                 pclk = pclk / 2;
 461
 462                 /* we can enable pixel_overlap if needed by panel. In this
 463                  * case we need to increase the pixelclock for extra pixels
 464                  */
 465                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
 466                         pclk += DIV_ROUND_UP(mode->vtotal *
 467                                                 intel_dsi->pixel_overlap *
 468                                                 60, 1000);
 469                 }
 470         }
 471
 472         /* Burst Mode Ratio
 473          * Target ddr frequency from VBT / non burst ddr freq
 474          * multiply by 100 to preserve remainder
 475          */
 476         if (intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
 477                 if (mipi_config->target_burst_mode_freq) {
 478                         computed_ddr =
 479                                 (pclk * bits_per_pixel) / intel_dsi->lane_count;
 480
 481                         if (mipi_config->target_burst_mode_freq <
 482                                                                 computed_ddr) {
 483                                 DRM_ERROR("Burst mode freq is less than computed\n");
 484                                 return NULL;
 485                         }
 486
 487                         burst_mode_ratio = DIV_ROUND_UP(
 488                                 mipi_config->target_burst_mode_freq * 100,
 489                                 computed_ddr);
 490
 491                         pclk = DIV_ROUND_UP(pclk * burst_mode_ratio, 100);
 492                 } else {
 493                         DRM_ERROR("Burst mode target is not set\n");
 494                         return NULL;
 495                 }
 496         } else
 497                 burst_mode_ratio = 100;
 498
 499         intel_dsi->burst_mode_ratio = burst_mode_ratio;
 500         intel_dsi->pclk = pclk;
 501
 502         bitrate = (pclk * bits_per_pixel) / intel_dsi->lane_count;
 503
 504         switch (intel_dsi->escape_clk_div) {
 505         case 0:
 506                 tlpx_ns = 50;
 507                 break;
 508         case 1:
 509                 tlpx_ns = 100;
 510                 break;
 511
 512         case 2:
 513                 tlpx_ns = 200;
 514                 break;
 515         default:
 516                 tlpx_ns = 50;
 517                 break;
 518         }
 519
 520         switch (intel_dsi->lane_count) {
 521         case 1:
 522         case 2:
 523                 extra_byte_count = 2;
 524                 break;
 525         case 3:
 526                 extra_byte_count = 4;
 527                 break;
 528         case 4:
 529         default:
 530                 extra_byte_count = 3;
 531                 break;
 532         }
 533
 534         /*
 535          * ui(s) = 1/f [f in hz]
 536          * ui(ns) = 10^9 / (f*10^6) [f in Mhz] -> 10^3/f(Mhz)
 537          */
 538
 539         /* in Kbps */
 540         ui_num = NS_KHZ_RATIO;
 541         ui_den = bitrate;
 542
 543         tclk_prepare_clkzero = mipi_config->tclk_prepare_clkzero;
 544         ths_prepare_hszero = mipi_config->ths_prepare_hszero;
 545
 546         /*
 547          * B060
 548          * LP byte clock = TLPX/ (8UI)
 549          */
 550         intel_dsi->lp_byte_clk = DIV_ROUND_UP(tlpx_ns * ui_den, 8 * ui_num);
 551
 552         /* count values in UI = (ns value) * (bitrate / (2 * 10^6))
 553          *
 554          * Since txddrclkhs_i is 2xUI, all the count values programmed in
 555          * DPHY param register are divided by 2
 556          *
 557          * prepare count
 558          */
 559         ths_prepare_ns = max(mipi_config->ths_prepare,
 560                              mipi_config->tclk_prepare);
 561         prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * 2);
 562
 563         /* exit zero count */
 564         exit_zero_cnt = DIV_ROUND_UP(
 565                                 (ths_prepare_hszero - ths_prepare_ns) * ui_den,
 566                                 ui_num * 2
 567                                 );
 568
 569         /*
 570          * Exit zero  is unified val ths_zero and ths_exit
 571          * minimum value for ths_exit = 110ns
 572          * min (exit_zero_cnt * 2) = 110/UI
 573          * exit_zero_cnt = 55/UI
 574          */
 575          if (exit_zero_cnt < (55 * ui_den / ui_num))
 576                 if ((55 * ui_den) % ui_num)
 577                         exit_zero_cnt += 1;
 578
 579         /* clk zero count */
 580         clk_zero_cnt = DIV_ROUND_UP(
 581                         (tclk_prepare_clkzero - ths_prepare_ns)
 582                         * ui_den, 2 * ui_num);
 583
 584         /* trail count */
 585         tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
 586         trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, 2 * ui_num);
 587
 588         if (prepare_cnt > PREPARE_CNT_MAX ||
 589                 exit_zero_cnt > EXIT_ZERO_CNT_MAX ||
 590                 clk_zero_cnt > CLK_ZERO_CNT_MAX ||
 591                 trail_cnt > TRAIL_CNT_MAX)
 592                 DRM_DEBUG_DRIVER("Values crossing maximum limits, restricting to max values\n");
 593
 594         if (prepare_cnt > PREPARE_CNT_MAX)
 595                 prepare_cnt = PREPARE_CNT_MAX;
 596
 597         if (exit_zero_cnt > EXIT_ZERO_CNT_MAX)
 598                 exit_zero_cnt = EXIT_ZERO_CNT_MAX;
 599
 600         if (clk_zero_cnt > CLK_ZERO_CNT_MAX)
 601                 clk_zero_cnt = CLK_ZERO_CNT_MAX;
 602
 603         if (trail_cnt > TRAIL_CNT_MAX)
 604                 trail_cnt = TRAIL_CNT_MAX;
 605
 606         /* B080 */
 607         intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
 608                                                 clk_zero_cnt << 8 | prepare_cnt;
 609
 610         /*
 611          * LP to HS switch count = 4TLPX + PREP_COUNT * 2 + EXIT_ZERO_COUNT * 2
 612          *                                      + 10UI + Extra Byte Count
 613          *
 614          * HS to LP switch count = THS-TRAIL + 2TLPX + Extra Byte Count
 615          * Extra Byte Count is calculated according to number of lanes.
 616          * High Low Switch Count is the Max of LP to HS and
 617          * HS to LP switch count
 618          *
 619          */
 620         tlpx_ui = DIV_ROUND_UP(tlpx_ns * ui_den, ui_num);
 621
 622         /* B044 */
 623         /* FIXME:
 624          * The comment above does not match with the code */
 625         lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * 2 +
 626                                                 exit_zero_cnt * 2 + 10, 8);
 627
 628         hs_to_lp_switch = DIV_ROUND_UP(mipi_config->ths_trail + 2 * tlpx_ui, 8);
 629
 630         intel_dsi->hs_to_lp_count = max(lp_to_hs_switch, hs_to_lp_switch);
 631         intel_dsi->hs_to_lp_count += extra_byte_count;
 632
 633         /* B088 */
 634         /* LP -> HS for clock lanes
 635          * LP clk sync + LP11 + LP01 + tclk_prepare + tclk_zero +
 636          *                                              extra byte count
 637          * 2TPLX + 1TLPX + 1 TPLX(in ns) + prepare_cnt * 2 + clk_zero_cnt *
 638          *                                      2(in UI) + extra byte count
 639          * In byteclks = (4TLPX + prepare_cnt * 2 + clk_zero_cnt *2 (in UI)) /
 640          *                                      8 + extra byte count
 641          */
 642         intel_dsi->clk_lp_to_hs_count =
 643                 DIV_ROUND_UP(
 644                         4 * tlpx_ui + prepare_cnt * 2 +
 645                         clk_zero_cnt * 2,
 646                         8);
 647
 648         intel_dsi->clk_lp_to_hs_count += extra_byte_count;
 649
 650         /* HS->LP for Clock Lanes
 651          * Low Power clock synchronisations + 1Tx byteclk + tclk_trail +
 652          *                                              Extra byte count
 653          * 2TLPX + 8UI + (trail_count*2)(in UI) + Extra byte count
 654          * In byteclks = (2*TLpx(in UI) + trail_count*2 +8)(in UI)/8 +
 655          *                                              Extra byte count
 656          */
 657         intel_dsi->clk_hs_to_lp_count =
 658                 DIV_ROUND_UP(2 * tlpx_ui + trail_cnt * 2 + 8,
 659                         8);
 660         intel_dsi->clk_hs_to_lp_count += extra_byte_count;
 661
 662         DRM_DEBUG_KMS("Eot %s\n", intel_dsi->eotp_pkt ? "enabled" : "disabled");
 663         DRM_DEBUG_KMS("Clockstop %s\n", intel_dsi->clock_stop ?
 664                                                 "disabled" : "enabled");
 665         DRM_DEBUG_KMS("Mode %s\n", intel_dsi->operation_mode ? "command" : "video");
 666         if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
 667                 DRM_DEBUG_KMS("Dual link: DSI_DUAL_LINK_FRONT_BACK\n");
 668         else if (intel_dsi->dual_link == DSI_DUAL_LINK_PIXEL_ALT)
 669                 DRM_DEBUG_KMS("Dual link: DSI_DUAL_LINK_PIXEL_ALT\n");
 670         else
 671                 DRM_DEBUG_KMS("Dual link: NONE\n");
 672         DRM_DEBUG_KMS("Pixel Format %d\n", intel_dsi->pixel_format);
 673         DRM_DEBUG_KMS("TLPX %d\n", intel_dsi->escape_clk_div);
 674         DRM_DEBUG_KMS("LP RX Timeout 0x%x\n", intel_dsi->lp_rx_timeout);
 675         DRM_DEBUG_KMS("Turnaround Timeout 0x%x\n", intel_dsi->turn_arnd_val);
 676         DRM_DEBUG_KMS("Init Count 0x%x\n", intel_dsi->init_count);
 677         DRM_DEBUG_KMS("HS to LP Count 0x%x\n", intel_dsi->hs_to_lp_count);
 678         DRM_DEBUG_KMS("LP Byte Clock %d\n", intel_dsi->lp_byte_clk);
 679         DRM_DEBUG_KMS("DBI BW Timer 0x%x\n", intel_dsi->bw_timer);
 680         DRM_DEBUG_KMS("LP to HS Clock Count 0x%x\n", intel_dsi->clk_lp_to_hs_count);
 681         DRM_DEBUG_KMS("HS to LP Clock Count 0x%x\n", intel_dsi->clk_hs_to_lp_count);
 682         DRM_DEBUG_KMS("BTA %s\n",
 683                         intel_dsi->video_frmt_cfg_bits & DISABLE_VIDEO_BTA ?
 684                         "disabled" : "enabled");
 685
 686         /* delays in VBT are in unit of 100us, so need to convert
 687          * here in ms
 688          * Delay (100us) * 100 /1000 = Delay / 10 (ms) */
 689         intel_dsi->backlight_off_delay = pps->bl_disable_delay / 10;
 690         intel_dsi->backlight_on_delay = pps->bl_enable_delay / 10;
 691         intel_dsi->panel_on_delay = pps->panel_on_delay / 10;
 692         intel_dsi->panel_off_delay = pps->panel_off_delay / 10;
 693         intel_dsi->panel_pwr_cycle_delay = pps->panel_power_cycle_delay / 10;
 694
 695         /* This is cheating a bit with the cleanup. */
 696         vbt_panel = devm_kzalloc(dev->dev, sizeof(*vbt_panel), GFP_KERNEL);
 697         if (!vbt_panel)
 698                 return NULL;
 699
 700         vbt_panel->intel_dsi = intel_dsi;
 701         drm_panel_init(&vbt_panel->panel);
 702         vbt_panel->panel.funcs = &vbt_panel_funcs;
 703         drm_panel_add(&vbt_panel->panel);
 704
 705         /* a regular driver would get the device in probe */
 706         for_each_dsi_port(port, intel_dsi->ports) {
 707                 mipi_dsi_attach(intel_dsi->dsi_hosts[port]->device);
 708         }
 709
 710         return &vbt_panel->panel;
 711 }