drivers/media/video/s5p-fimc/mipi-csis.c

   1 /*
   2  * Samsung S5P/EXYNOS4 SoC series MIPI-CSI receiver driver
   3  *
   4  * Copyright (C) 2011 - 2012 Samsung Electronics Co., Ltd.
   5  * Sylwester Nawrocki, <s.nawrocki@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/irq.h>
  19 #include <linux/kernel.h>
  20 #include <linux/memory.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/slab.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/videodev2.h>
  28 #include <media/v4l2-subdev.h>
  29 #include <linux/platform_data/mipi-csis.h>
  30 #include "mipi-csis.h"
  31
  32 static int debug;
  33 module_param(debug, int, 0644);
  34 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  35
  36 /* Register map definition */
  37
  38 /* CSIS global control */
  39 #define S5PCSIS_CTRL                    0x00
  40 #define S5PCSIS_CTRL_DPDN_DEFAULT       (0 << 31)
  41 #define S5PCSIS_CTRL_DPDN_SWAP          (1 << 31)
  42 #define S5PCSIS_CTRL_ALIGN_32BIT        (1 << 20)
  43 #define S5PCSIS_CTRL_UPDATE_SHADOW      (1 << 16)
  44 #define S5PCSIS_CTRL_WCLK_EXTCLK        (1 << 8)
  45 #define S5PCSIS_CTRL_RESET              (1 << 4)
  46 #define S5PCSIS_CTRL_ENABLE             (1 << 0)
  47
  48 /* D-PHY control */
  49 #define S5PCSIS_DPHYCTRL                0x04
  50 #define S5PCSIS_DPHYCTRL_HSS_MASK       (0x1f << 27)
  51 #define S5PCSIS_DPHYCTRL_ENABLE         (0x1f << 0)
  52
  53 #define S5PCSIS_CONFIG                  0x08
  54 #define S5PCSIS_CFG_FMT_YCBCR422_8BIT   (0x1e << 2)
  55 #define S5PCSIS_CFG_FMT_RAW8            (0x2a << 2)
  56 #define S5PCSIS_CFG_FMT_RAW10           (0x2b << 2)
  57 #define S5PCSIS_CFG_FMT_RAW12           (0x2c << 2)
  58 /* User defined formats, x = 1...4 */
  59 #define S5PCSIS_CFG_FMT_USER(x)         ((0x30 + x - 1) << 2)
  60 #define S5PCSIS_CFG_FMT_MASK            (0x3f << 2)
  61 #define S5PCSIS_CFG_NR_LANE_MASK        3
  62
  63 /* Interrupt mask. */
  64 #define S5PCSIS_INTMSK                  0x10
  65 #define S5PCSIS_INTMSK_EN_ALL           0xf000003f
  66 #define S5PCSIS_INTSRC                  0x14
  67
  68 /* Pixel resolution */
  69 #define S5PCSIS_RESOL                   0x2c
  70 #define CSIS_MAX_PIX_WIDTH              0xffff
  71 #define CSIS_MAX_PIX_HEIGHT             0xffff
  72
  73 enum {
  74         CSIS_CLK_MUX,
  75         CSIS_CLK_GATE,
  76 };
  77
  78 static char *csi_clock_name[] = {
  79         [CSIS_CLK_MUX]  = "sclk_csis",
  80         [CSIS_CLK_GATE] = "csis",
  81 };
  82 #define NUM_CSIS_CLOCKS ARRAY_SIZE(csi_clock_name)
  83
  84 static const char * const csis_supply_name[] = {
  85         "vdd11", /* 1.1V or 1.2V (s5pc100) MIPI CSI suppply */
  86         "vdd18", /* VDD 1.8V and MIPI CSI PLL supply */
  87 };
  88 #define CSIS_NUM_SUPPLIES ARRAY_SIZE(csis_supply_name)
  89
  90 enum {
  91         ST_POWERED      = 1,
  92         ST_STREAMING    = 2,
  93         ST_SUSPENDED    = 4,
  94 };
  95
  96 /**
  97  * struct csis_state - the driver's internal state data structure
  98  * @lock: mutex serializing the subdev and power management operations,
  99  *        protecting @format and @flags members
 100  * @pads: CSIS pads array
 101  * @sd: v4l2_subdev associated with CSIS device instance
 102  * @pdev: CSIS platform device
 103  * @regs: mmaped I/O registers memory
 104  * @clock: CSIS clocks
 105  * @irq: requested s5p-mipi-csis irq number
 106  * @flags: the state variable for power and streaming control
 107  * @csis_fmt: current CSIS pixel format
 108  * @format: common media bus format for the source and sink pad
 109  */
 110 struct csis_state {
 111         struct mutex lock;
 112         struct media_pad pads[CSIS_PADS_NUM];
 113         struct v4l2_subdev sd;
 114         struct platform_device *pdev;
 115         void __iomem *regs;
 116         struct regulator_bulk_data supplies[CSIS_NUM_SUPPLIES];
 117         struct clk *clock[NUM_CSIS_CLOCKS];
 118         int irq;
 119         u32 flags;
 120         const struct csis_pix_format *csis_fmt;
 121         struct v4l2_mbus_framefmt format;
 122 };
 123
 124 /**
 125  * struct csis_pix_format - CSIS pixel format description
 126  * @pix_width_alignment: horizontal pixel alignment, width will be
 127  *                       multiple of 2^pix_width_alignment
 128  * @code: corresponding media bus code
 129  * @fmt_reg: S5PCSIS_CONFIG register value
 130  * @data_alignment: MIPI-CSI data alignment in bits
 131  */
 132 struct csis_pix_format {
 133         unsigned int pix_width_alignment;
 134         enum v4l2_mbus_pixelcode code;
 135         u32 fmt_reg;
 136         u8 data_alignment;
 137 };
 138
 139 static const struct csis_pix_format s5pcsis_formats[] = {
 140         {
 141                 .code = V4L2_MBUS_FMT_VYUY8_2X8,
 142                 .fmt_reg = S5PCSIS_CFG_FMT_YCBCR422_8BIT,
 143                 .data_alignment = 32,
 144         }, {
 145                 .code = V4L2_MBUS_FMT_JPEG_1X8,
 146                 .fmt_reg = S5PCSIS_CFG_FMT_USER(1),
 147                 .data_alignment = 32,
 148         },
 149 };
 150
 151 #define s5pcsis_write(__csis, __r, __v) writel(__v, __csis->regs + __r)
 152 #define s5pcsis_read(__csis, __r) readl(__csis->regs + __r)
 153
 154 static struct csis_state *sd_to_csis_state(struct v4l2_subdev *sdev)
 155 {
 156         return container_of(sdev, struct csis_state, sd);
 157 }
 158
 159 static const struct csis_pix_format *find_csis_format(
 160         struct v4l2_mbus_framefmt *mf)
 161 {
 162         int i;
 163
 164         for (i = 0; i < ARRAY_SIZE(s5pcsis_formats); i++)
 165                 if (mf->code == s5pcsis_formats[i].code)
 166                         return &s5pcsis_formats[i];
 167         return NULL;
 168 }
 169
 170 static void s5pcsis_enable_interrupts(struct csis_state *state, bool on)
 171 {
 172         u32 val = s5pcsis_read(state, S5PCSIS_INTMSK);
 173
 174         val = on ? val | S5PCSIS_INTMSK_EN_ALL :
 175                    val & ~S5PCSIS_INTMSK_EN_ALL;
 176         s5pcsis_write(state, S5PCSIS_INTMSK, val);
 177 }
 178
 179 static void s5pcsis_reset(struct csis_state *state)
 180 {
 181         u32 val = s5pcsis_read(state, S5PCSIS_CTRL);
 182
 183         s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_RESET);
 184         udelay(10);
 185 }
 186
 187 static void s5pcsis_system_enable(struct csis_state *state, int on)
 188 {
 189         u32 val;
 190
 191         val = s5pcsis_read(state, S5PCSIS_CTRL);
 192         if (on)
 193                 val |= S5PCSIS_CTRL_ENABLE;
 194         else
 195                 val &= ~S5PCSIS_CTRL_ENABLE;
 196         s5pcsis_write(state, S5PCSIS_CTRL, val);
 197
 198         val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
 199         if (on)
 200                 val |= S5PCSIS_DPHYCTRL_ENABLE;
 201         else
 202                 val &= ~S5PCSIS_DPHYCTRL_ENABLE;
 203         s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
 204 }
 205
 206 /* Called with the state.lock mutex held */
 207 static void __s5pcsis_set_format(struct csis_state *state)
 208 {
 209         struct v4l2_mbus_framefmt *mf = &state->format;
 210         u32 val;
 211
 212         v4l2_dbg(1, debug, &state->sd, "fmt: %d, %d x %d\n",
 213                  mf->code, mf->width, mf->height);
 214
 215         /* Color format */
 216         val = s5pcsis_read(state, S5PCSIS_CONFIG);
 217         val = (val & ~S5PCSIS_CFG_FMT_MASK) | state->csis_fmt->fmt_reg;
 218         s5pcsis_write(state, S5PCSIS_CONFIG, val);
 219
 220         /* Pixel resolution */
 221         val = (mf->width << 16) | mf->height;
 222         s5pcsis_write(state, S5PCSIS_RESOL, val);
 223 }
 224
 225 static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
 226 {
 227         u32 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
 228
 229         val = (val & ~S5PCSIS_DPHYCTRL_HSS_MASK) | (settle << 27);
 230         s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
 231 }
 232
 233 static void s5pcsis_set_params(struct csis_state *state)
 234 {
 235         struct s5p_platform_mipi_csis *pdata = state->pdev->dev.platform_data;
 236         u32 val;
 237
 238         val = s5pcsis_read(state, S5PCSIS_CONFIG);
 239         val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (pdata->lanes - 1);
 240         s5pcsis_write(state, S5PCSIS_CONFIG, val);
 241
 242         __s5pcsis_set_format(state);
 243         s5pcsis_set_hsync_settle(state, pdata->hs_settle);
 244
 245         val = s5pcsis_read(state, S5PCSIS_CTRL);
 246         if (state->csis_fmt->data_alignment == 32)
 247                 val |= S5PCSIS_CTRL_ALIGN_32BIT;
 248         else /* 24-bits */
 249                 val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
 250         /* Not using external clock. */
 251         val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
 252         s5pcsis_write(state, S5PCSIS_CTRL, val);
 253
 254         /* Update the shadow register. */
 255         val = s5pcsis_read(state, S5PCSIS_CTRL);
 256         s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_UPDATE_SHADOW);
 257 }
 258
 259 static void s5pcsis_clk_put(struct csis_state *state)
 260 {
 261         int i;
 262
 263         for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
 264                 if (IS_ERR_OR_NULL(state->clock[i]))
 265                         continue;
 266                 clk_unprepare(state->clock[i]);
 267                 clk_put(state->clock[i]);
 268                 state->clock[i] = NULL;
 269         }
 270 }
 271
 272 static int s5pcsis_clk_get(struct csis_state *state)
 273 {
 274         struct device *dev = &state->pdev->dev;
 275         int i, ret;
 276
 277         for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
 278                 state->clock[i] = clk_get(dev, csi_clock_name[i]);
 279                 if (IS_ERR(state->clock[i]))
 280                         goto err;
 281                 ret = clk_prepare(state->clock[i]);
 282                 if (ret < 0) {
 283                         clk_put(state->clock[i]);
 284                         state->clock[i] = NULL;
 285                         goto err;
 286                 }
 287         }
 288         return 0;
 289 err:
 290         s5pcsis_clk_put(state);
 291         dev_err(dev, "failed to get clock: %s\n", csi_clock_name[i]);
 292         return -ENXIO;
 293 }
 294
 295 static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
 296 {
 297         struct csis_state *state = sd_to_csis_state(sd);
 298         struct device *dev = &state->pdev->dev;
 299
 300         if (on)
 301                 return pm_runtime_get_sync(dev);
 302
 303         return pm_runtime_put_sync(dev);
 304 }
 305
 306 static void s5pcsis_start_stream(struct csis_state *state)
 307 {
 308         s5pcsis_reset(state);
 309         s5pcsis_set_params(state);
 310         s5pcsis_system_enable(state, true);
 311         s5pcsis_enable_interrupts(state, true);
 312 }
 313
 314 static void s5pcsis_stop_stream(struct csis_state *state)
 315 {
 316         s5pcsis_enable_interrupts(state, false);
 317         s5pcsis_system_enable(state, false);
 318 }
 319
 320 /* v4l2_subdev operations */
 321 static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
 322 {
 323         struct csis_state *state = sd_to_csis_state(sd);
 324         int ret = 0;
 325
 326         v4l2_dbg(1, debug, sd, "%s: %d, state: 0x%x\n",
 327                  __func__, enable, state->flags);
 328
 329         if (enable) {
 330                 ret = pm_runtime_get_sync(&state->pdev->dev);
 331                 if (ret && ret != 1)
 332                         return ret;
 333         }
 334         mutex_lock(&state->lock);
 335         if (enable) {
 336                 if (state->flags & ST_SUSPENDED) {
 337                         ret = -EBUSY;
 338                         goto unlock;
 339                 }
 340                 s5pcsis_start_stream(state);
 341                 state->flags |= ST_STREAMING;
 342         } else {
 343                 s5pcsis_stop_stream(state);
 344                 state->flags &= ~ST_STREAMING;
 345         }
 346 unlock:
 347         mutex_unlock(&state->lock);
 348         if (!enable)
 349                 pm_runtime_put(&state->pdev->dev);
 350
 351         return ret == 1 ? 0 : ret;
 352 }
 353
 354 static int s5pcsis_enum_mbus_code(struct v4l2_subdev *sd,
 355                                   struct v4l2_subdev_fh *fh,
 356                                   struct v4l2_subdev_mbus_code_enum *code)
 357 {
 358         if (code->index >= ARRAY_SIZE(s5pcsis_formats))
 359                 return -EINVAL;
 360
 361         code->code = s5pcsis_formats[code->index].code;
 362         return 0;
 363 }
 364
 365 static struct csis_pix_format const *s5pcsis_try_format(
 366         struct v4l2_mbus_framefmt *mf)
 367 {
 368         struct csis_pix_format const *csis_fmt;
 369
 370         csis_fmt = find_csis_format(mf);
 371         if (csis_fmt == NULL)
 372                 csis_fmt = &s5pcsis_formats[0];
 373
 374         mf->code = csis_fmt->code;
 375         v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH,
 376                               csis_fmt->pix_width_alignment,
 377                               &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1,
 378                               0);
 379         return csis_fmt;
 380 }
 381
 382 static struct v4l2_mbus_framefmt *__s5pcsis_get_format(
 383                 struct csis_state *state, struct v4l2_subdev_fh *fh,
 384                 u32 pad, enum v4l2_subdev_format_whence which)
 385 {
 386         if (which == V4L2_SUBDEV_FORMAT_TRY)
 387                 return fh ? v4l2_subdev_get_try_format(fh, pad) : NULL;
 388
 389         return &state->format;
 390 }
 391
 392 static int s5pcsis_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 393                            struct v4l2_subdev_format *fmt)
 394 {
 395         struct csis_state *state = sd_to_csis_state(sd);
 396         struct csis_pix_format const *csis_fmt;
 397         struct v4l2_mbus_framefmt *mf;
 398
 399         if (fmt->pad != CSIS_PAD_SOURCE && fmt->pad != CSIS_PAD_SINK)
 400                 return -EINVAL;
 401
 402         mf = __s5pcsis_get_format(state, fh, fmt->pad, fmt->which);
 403
 404         if (fmt->pad == CSIS_PAD_SOURCE) {
 405                 if (mf) {
 406                         mutex_lock(&state->lock);
 407                         fmt->format = *mf;
 408                         mutex_unlock(&state->lock);
 409                 }
 410                 return 0;
 411         }
 412         csis_fmt = s5pcsis_try_format(&fmt->format);
 413         if (mf) {
 414                 mutex_lock(&state->lock);
 415                 *mf = fmt->format;
 416                 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
 417                         state->csis_fmt = csis_fmt;
 418                 mutex_unlock(&state->lock);
 419         }
 420         return 0;
 421 }
 422
 423 static int s5pcsis_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
 424                            struct v4l2_subdev_format *fmt)
 425 {
 426         struct csis_state *state = sd_to_csis_state(sd);
 427         struct v4l2_mbus_framefmt *mf;
 428
 429         if (fmt->pad != CSIS_PAD_SOURCE && fmt->pad != CSIS_PAD_SINK)
 430                 return -EINVAL;
 431
 432         mf = __s5pcsis_get_format(state, fh, fmt->pad, fmt->which);
 433         if (!mf)
 434                 return -EINVAL;
 435
 436         mutex_lock(&state->lock);
 437         fmt->format = *mf;
 438         mutex_unlock(&state->lock);
 439         return 0;
 440 }
 441
 442 static int s5pcsis_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 443 {
 444         struct v4l2_mbus_framefmt *format = v4l2_subdev_get_try_format(fh, 0);
 445
 446         format->colorspace = V4L2_COLORSPACE_JPEG;
 447         format->code = s5pcsis_formats[0].code;
 448         format->width = S5PCSIS_DEF_PIX_WIDTH;
 449         format->height = S5PCSIS_DEF_PIX_HEIGHT;
 450         format->field = V4L2_FIELD_NONE;
 451
 452         return 0;
 453 }
 454
 455 static const struct v4l2_subdev_internal_ops s5pcsis_sd_internal_ops = {
 456         .open = s5pcsis_open,
 457 };
 458
 459 static struct v4l2_subdev_core_ops s5pcsis_core_ops = {
 460         .s_power = s5pcsis_s_power,
 461 };
 462
 463 static struct v4l2_subdev_pad_ops s5pcsis_pad_ops = {
 464         .enum_mbus_code = s5pcsis_enum_mbus_code,
 465         .get_fmt = s5pcsis_get_fmt,
 466         .set_fmt = s5pcsis_set_fmt,
 467 };
 468
 469 static struct v4l2_subdev_video_ops s5pcsis_video_ops = {
 470         .s_stream = s5pcsis_s_stream,
 471 };
 472
 473 static struct v4l2_subdev_ops s5pcsis_subdev_ops = {
 474         .core = &s5pcsis_core_ops,
 475         .pad = &s5pcsis_pad_ops,
 476         .video = &s5pcsis_video_ops,
 477 };
 478
 479 static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
 480 {
 481         struct csis_state *state = dev_id;
 482         u32 val;
 483
 484         /* Just clear the interrupt pending bits. */
 485         val = s5pcsis_read(state, S5PCSIS_INTSRC);
 486         s5pcsis_write(state, S5PCSIS_INTSRC, val);
 487
 488         return IRQ_HANDLED;
 489 }
 490
 491 static int __devinit s5pcsis_probe(struct platform_device *pdev)
 492 {
 493         struct s5p_platform_mipi_csis *pdata;
 494         struct resource *mem_res;
 495         struct csis_state *state;
 496         int ret = -ENOMEM;
 497         int i;
 498
 499         state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
 500         if (!state)
 501                 return -ENOMEM;
 502
 503         mutex_init(&state->lock);
 504         state->pdev = pdev;
 505
 506         pdata = pdev->dev.platform_data;
 507         if (pdata == NULL || pdata->phy_enable == NULL) {
 508                 dev_err(&pdev->dev, "Platform data not fully specified\n");
 509                 return -EINVAL;
 510         }
 511
 512         if ((pdev->id == 1 && pdata->lanes > CSIS1_MAX_LANES) ||
 513             pdata->lanes > CSIS0_MAX_LANES) {
 514                 dev_err(&pdev->dev, "Unsupported number of data lanes: %d\n",
 515                         pdata->lanes);
 516                 return -EINVAL;
 517         }
 518
 519         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 520         state->regs = devm_request_and_ioremap(&pdev->dev, mem_res);
 521         if (state->regs == NULL) {
 522                 dev_err(&pdev->dev, "Failed to request and remap io memory\n");
 523                 return -ENXIO;
 524         }
 525
 526         state->irq = platform_get_irq(pdev, 0);
 527         if (state->irq < 0) {
 528                 dev_err(&pdev->dev, "Failed to get irq\n");
 529                 return state->irq;
 530         }
 531
 532         for (i = 0; i < CSIS_NUM_SUPPLIES; i++)
 533                 state->supplies[i].supply = csis_supply_name[i];
 534
 535         ret = regulator_bulk_get(&pdev->dev, CSIS_NUM_SUPPLIES,
 536                                  state->supplies);
 537         if (ret)
 538                 return ret;
 539
 540         ret = s5pcsis_clk_get(state);
 541         if (ret)
 542                 goto e_clkput;
 543
 544         clk_enable(state->clock[CSIS_CLK_MUX]);
 545         if (pdata->clk_rate)
 546                 clk_set_rate(state->clock[CSIS_CLK_MUX], pdata->clk_rate);
 547         else
 548                 dev_WARN(&pdev->dev, "No clock frequency specified!\n");
 549
 550         ret = devm_request_irq(&pdev->dev, state->irq, s5pcsis_irq_handler,
 551                                0, dev_name(&pdev->dev), state);
 552         if (ret) {
 553                 dev_err(&pdev->dev, "Interrupt request failed\n");
 554                 goto e_regput;
 555         }
 556
 557         v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
 558         state->sd.owner = THIS_MODULE;
 559         strlcpy(state->sd.name, dev_name(&pdev->dev), sizeof(state->sd.name));
 560         state->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 561         state->csis_fmt = &s5pcsis_formats[0];
 562
 563         state->format.code = s5pcsis_formats[0].code;
 564         state->format.width = S5PCSIS_DEF_PIX_WIDTH;
 565         state->format.height = S5PCSIS_DEF_PIX_HEIGHT;
 566
 567         state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 568         state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 569         ret = media_entity_init(&state->sd.entity,
 570                                 CSIS_PADS_NUM, state->pads, 0);
 571         if (ret < 0)
 572                 goto e_clkput;
 573
 574         /* This allows to retrieve the platform device id by the host driver */
 575         v4l2_set_subdevdata(&state->sd, pdev);
 576
 577         /* .. and a pointer to the subdev. */
 578         platform_set_drvdata(pdev, &state->sd);
 579
 580         pm_runtime_enable(&pdev->dev);
 581         return 0;
 582
 583 e_regput:
 584         regulator_bulk_free(CSIS_NUM_SUPPLIES, state->supplies);
 585 e_clkput:
 586         clk_disable(state->clock[CSIS_CLK_MUX]);
 587         s5pcsis_clk_put(state);
 588         return ret;
 589 }
 590
 591 static int s5pcsis_pm_suspend(struct device *dev, bool runtime)
 592 {
 593         struct s5p_platform_mipi_csis *pdata = dev->platform_data;
 594         struct platform_device *pdev = to_platform_device(dev);
 595         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 596         struct csis_state *state = sd_to_csis_state(sd);
 597         int ret = 0;
 598
 599         v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
 600                  __func__, state->flags);
 601
 602         mutex_lock(&state->lock);
 603         if (state->flags & ST_POWERED) {
 604                 s5pcsis_stop_stream(state);
 605                 ret = pdata->phy_enable(state->pdev, false);
 606                 if (ret)
 607                         goto unlock;
 608                 ret = regulator_bulk_disable(CSIS_NUM_SUPPLIES,
 609                                              state->supplies);
 610                 if (ret)
 611                         goto unlock;
 612                 clk_disable(state->clock[CSIS_CLK_GATE]);
 613                 state->flags &= ~ST_POWERED;
 614                 if (!runtime)
 615                         state->flags |= ST_SUSPENDED;
 616         }
 617  unlock:
 618         mutex_unlock(&state->lock);
 619         return ret ? -EAGAIN : 0;
 620 }
 621
 622 static int s5pcsis_pm_resume(struct device *dev, bool runtime)
 623 {
 624         struct s5p_platform_mipi_csis *pdata = dev->platform_data;
 625         struct platform_device *pdev = to_platform_device(dev);
 626         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 627         struct csis_state *state = sd_to_csis_state(sd);
 628         int ret = 0;
 629
 630         v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
 631                  __func__, state->flags);
 632
 633         mutex_lock(&state->lock);
 634         if (!runtime && !(state->flags & ST_SUSPENDED))
 635                 goto unlock;
 636
 637         if (!(state->flags & ST_POWERED)) {
 638                 ret = regulator_bulk_enable(CSIS_NUM_SUPPLIES,
 639                                             state->supplies);
 640                 if (ret)
 641                         goto unlock;
 642                 ret = pdata->phy_enable(state->pdev, true);
 643                 if (!ret) {
 644                         state->flags |= ST_POWERED;
 645                 } else {
 646                         regulator_bulk_disable(CSIS_NUM_SUPPLIES,
 647                                                state->supplies);
 648                         goto unlock;
 649                 }
 650                 clk_enable(state->clock[CSIS_CLK_GATE]);
 651         }
 652         if (state->flags & ST_STREAMING)
 653                 s5pcsis_start_stream(state);
 654
 655         state->flags &= ~ST_SUSPENDED;
 656  unlock:
 657         mutex_unlock(&state->lock);
 658         return ret ? -EAGAIN : 0;
 659 }
 660
 661 #ifdef CONFIG_PM_SLEEP
 662 static int s5pcsis_suspend(struct device *dev)
 663 {
 664         return s5pcsis_pm_suspend(dev, false);
 665 }
 666
 667 static int s5pcsis_resume(struct device *dev)
 668 {
 669         return s5pcsis_pm_resume(dev, false);
 670 }
 671 #endif
 672
 673 #ifdef CONFIG_PM_RUNTIME
 674 static int s5pcsis_runtime_suspend(struct device *dev)
 675 {
 676         return s5pcsis_pm_suspend(dev, true);
 677 }
 678
 679 static int s5pcsis_runtime_resume(struct device *dev)
 680 {
 681         return s5pcsis_pm_resume(dev, true);
 682 }
 683 #endif
 684
 685 static int __devexit s5pcsis_remove(struct platform_device *pdev)
 686 {
 687         struct v4l2_subdev *sd = platform_get_drvdata(pdev);
 688         struct csis_state *state = sd_to_csis_state(sd);
 689
 690         pm_runtime_disable(&pdev->dev);
 691         s5pcsis_pm_suspend(&pdev->dev, false);
 692         clk_disable(state->clock[CSIS_CLK_MUX]);
 693         pm_runtime_set_suspended(&pdev->dev);
 694         s5pcsis_clk_put(state);
 695         regulator_bulk_free(CSIS_NUM_SUPPLIES, state->supplies);
 696
 697         media_entity_cleanup(&state->sd.entity);
 698
 699         return 0;
 700 }
 701
 702 static const struct dev_pm_ops s5pcsis_pm_ops = {
 703         SET_RUNTIME_PM_OPS(s5pcsis_runtime_suspend, s5pcsis_runtime_resume,
 704                            NULL)
 705         SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_suspend, s5pcsis_resume)
 706 };
 707
 708 static struct platform_driver s5pcsis_driver = {
 709         .probe          = s5pcsis_probe,
 710         .remove         = __devexit_p(s5pcsis_remove),
 711         .driver         = {
 712                 .name   = CSIS_DRIVER_NAME,
 713                 .owner  = THIS_MODULE,
 714                 .pm     = &s5pcsis_pm_ops,
 715         },
 716 };
 717
 718 module_platform_driver(s5pcsis_driver);
 719
 720 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
 721 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC MIPI-CSI2 receiver driver");
 722 MODULE_LICENSE("GPL");