drivers/gpu/drm/zte/zx_hdmi.c

   1 /*
   2  * Copyright 2016 Linaro Ltd.
   3  * Copyright 2016 ZTE Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/component.h>
  13 #include <linux/delay.h>
  14 #include <linux/err.h>
  15 #include <linux/hdmi.h>
  16 #include <linux/irq.h>
  17 #include <linux/mfd/syscon.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/of_device.h>
  21
  22 #include <drm/drm_atomic_helper.h>
  23 #include <drm/drm_edid.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_probe_helper.h>
  26 #include <drm/drm_print.h>
  27
  28 #include <sound/hdmi-codec.h>
  29
  30 #include "zx_hdmi_regs.h"
  31 #include "zx_vou.h"
  32
  33 #define ZX_HDMI_INFOFRAME_SIZE          31
  34 #define DDC_SEGMENT_ADDR                0x30
  35
  36 struct zx_hdmi_i2c {
  37         struct i2c_adapter adap;
  38         struct mutex lock;
  39 };
  40
  41 struct zx_hdmi {
  42         struct drm_connector connector;
  43         struct drm_encoder encoder;
  44         struct zx_hdmi_i2c *ddc;
  45         struct device *dev;
  46         struct drm_device *drm;
  47         void __iomem *mmio;
  48         struct clk *cec_clk;
  49         struct clk *osc_clk;
  50         struct clk *xclk;
  51         bool sink_is_hdmi;
  52         bool sink_has_audio;
  53         struct platform_device *audio_pdev;
  54 };
  55
  56 #define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)
  57
  58 static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
  59 {
  60         return readl_relaxed(hdmi->mmio + offset * 4);
  61 }
  62
  63 static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
  64 {
  65         writel_relaxed(val, hdmi->mmio + offset * 4);
  66 }
  67
  68 static inline void hdmi_writeb_mask(struct zx_hdmi *hdmi, u16 offset,
  69                                     u8 mask, u8 val)
  70 {
  71         u8 tmp;
  72
  73         tmp = hdmi_readb(hdmi, offset);
  74         tmp = (tmp & ~mask) | (val & mask);
  75         hdmi_writeb(hdmi, offset, tmp);
  76 }
  77
  78 static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
  79                                    union hdmi_infoframe *frame, u8 fsel)
  80 {
  81         u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
  82         int num;
  83         int i;
  84
  85         hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);
  86
  87         num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
  88         if (num < 0) {
  89                 DRM_DEV_ERROR(hdmi->dev, "failed to pack infoframe: %d\n", num);
  90                 return num;
  91         }
  92
  93         for (i = 0; i < num; i++)
  94                 hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);
  95
  96         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_RPT,
  97                          TPI_INFO_TRANS_RPT);
  98         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_EN,
  99                          TPI_INFO_TRANS_EN);
 100
 101         return num;
 102 }
 103
 104 static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
 105                                     struct drm_display_mode *mode)
 106 {
 107         union hdmi_infoframe frame;
 108         int ret;
 109
 110         ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
 111                                                           &hdmi->connector,
 112                                                           mode);
 113         if (ret) {
 114                 DRM_DEV_ERROR(hdmi->dev, "failed to get vendor infoframe: %d\n",
 115                               ret);
 116                 return ret;
 117         }
 118
 119         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_VSIF);
 120 }
 121
 122 static int zx_hdmi_config_video_avi(struct zx_hdmi *hdmi,
 123                                     struct drm_display_mode *mode)
 124 {
 125         union hdmi_infoframe frame;
 126         int ret;
 127
 128         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
 129                                                        &hdmi->connector,
 130                                                        mode);
 131         if (ret) {
 132                 DRM_DEV_ERROR(hdmi->dev, "failed to get avi infoframe: %d\n",
 133                               ret);
 134                 return ret;
 135         }
 136
 137         /* We always use YUV444 for HDMI output. */
 138         frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
 139
 140         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AVI);
 141 }
 142
 143 static void zx_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 144                                      struct drm_display_mode *mode,
 145                                      struct drm_display_mode *adj_mode)
 146 {
 147         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 148
 149         if (hdmi->sink_is_hdmi) {
 150                 zx_hdmi_config_video_avi(hdmi, mode);
 151                 zx_hdmi_config_video_vsi(hdmi, mode);
 152         }
 153 }
 154
 155 static void zx_hdmi_phy_start(struct zx_hdmi *hdmi)
 156 {
 157         /* Copy from ZTE BSP code */
 158         hdmi_writeb(hdmi, 0x222, 0x0);
 159         hdmi_writeb(hdmi, 0x224, 0x4);
 160         hdmi_writeb(hdmi, 0x909, 0x0);
 161         hdmi_writeb(hdmi, 0x7b0, 0x90);
 162         hdmi_writeb(hdmi, 0x7b1, 0x00);
 163         hdmi_writeb(hdmi, 0x7b2, 0xa7);
 164         hdmi_writeb(hdmi, 0x7b8, 0xaa);
 165         hdmi_writeb(hdmi, 0x7b2, 0xa7);
 166         hdmi_writeb(hdmi, 0x7b3, 0x0f);
 167         hdmi_writeb(hdmi, 0x7b4, 0x0f);
 168         hdmi_writeb(hdmi, 0x7b5, 0x55);
 169         hdmi_writeb(hdmi, 0x7b7, 0x03);
 170         hdmi_writeb(hdmi, 0x7b9, 0x12);
 171         hdmi_writeb(hdmi, 0x7ba, 0x32);
 172         hdmi_writeb(hdmi, 0x7bc, 0x68);
 173         hdmi_writeb(hdmi, 0x7be, 0x40);
 174         hdmi_writeb(hdmi, 0x7bf, 0x84);
 175         hdmi_writeb(hdmi, 0x7c1, 0x0f);
 176         hdmi_writeb(hdmi, 0x7c8, 0x02);
 177         hdmi_writeb(hdmi, 0x7c9, 0x03);
 178         hdmi_writeb(hdmi, 0x7ca, 0x40);
 179         hdmi_writeb(hdmi, 0x7dc, 0x31);
 180         hdmi_writeb(hdmi, 0x7e2, 0x04);
 181         hdmi_writeb(hdmi, 0x7e0, 0x06);
 182         hdmi_writeb(hdmi, 0x7cb, 0x68);
 183         hdmi_writeb(hdmi, 0x7f9, 0x02);
 184         hdmi_writeb(hdmi, 0x7b6, 0x02);
 185         hdmi_writeb(hdmi, 0x7f3, 0x0);
 186 }
 187
 188 static void zx_hdmi_hw_enable(struct zx_hdmi *hdmi)
 189 {
 190         /* Enable pclk */
 191         hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, CLKPWD_PDIDCK);
 192
 193         /* Enable HDMI for TX */
 194         hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, FUNC_HDMI_EN);
 195
 196         /* Enable deep color packet */
 197         hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
 198
 199         /* Enable HDMI/MHL mode for output */
 200         hdmi_writeb_mask(hdmi, TEST_TXCTRL, TEST_TXCTRL_HDMI_MODE,
 201                          TEST_TXCTRL_HDMI_MODE);
 202
 203         /* Configure reg_qc_sel */
 204         hdmi_writeb(hdmi, HDMICTL4, 0x3);
 205
 206         /* Enable interrupt */
 207         hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT,
 208                          INTR1_MONITOR_DETECT);
 209
 210         /* Start up phy */
 211         zx_hdmi_phy_start(hdmi);
 212 }
 213
 214 static void zx_hdmi_hw_disable(struct zx_hdmi *hdmi)
 215 {
 216         /* Disable interrupt */
 217         hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT, 0);
 218
 219         /* Disable deep color packet */
 220         hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
 221
 222         /* Disable HDMI for TX */
 223         hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, 0);
 224
 225         /* Disable pclk */
 226         hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, 0);
 227 }
 228
 229 static void zx_hdmi_encoder_enable(struct drm_encoder *encoder)
 230 {
 231         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 232
 233         clk_prepare_enable(hdmi->cec_clk);
 234         clk_prepare_enable(hdmi->osc_clk);
 235         clk_prepare_enable(hdmi->xclk);
 236
 237         zx_hdmi_hw_enable(hdmi);
 238
 239         vou_inf_enable(VOU_HDMI, encoder->crtc);
 240 }
 241
 242 static void zx_hdmi_encoder_disable(struct drm_encoder *encoder)
 243 {
 244         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 245
 246         vou_inf_disable(VOU_HDMI, encoder->crtc);
 247
 248         zx_hdmi_hw_disable(hdmi);
 249
 250         clk_disable_unprepare(hdmi->xclk);
 251         clk_disable_unprepare(hdmi->osc_clk);
 252         clk_disable_unprepare(hdmi->cec_clk);
 253 }
 254
 255 static const struct drm_encoder_helper_funcs zx_hdmi_encoder_helper_funcs = {
 256         .enable = zx_hdmi_encoder_enable,
 257         .disable = zx_hdmi_encoder_disable,
 258         .mode_set = zx_hdmi_encoder_mode_set,
 259 };
 260
 261 static const struct drm_encoder_funcs zx_hdmi_encoder_funcs = {
 262         .destroy = drm_encoder_cleanup,
 263 };
 264
 265 static int zx_hdmi_connector_get_modes(struct drm_connector *connector)
 266 {
 267         struct zx_hdmi *hdmi = to_zx_hdmi(connector);
 268         struct edid *edid;
 269         int ret;
 270
 271         edid = drm_get_edid(connector, &hdmi->ddc->adap);
 272         if (!edid)
 273                 return 0;
 274
 275         hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
 276         hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
 277         drm_connector_update_edid_property(connector, edid);
 278         ret = drm_add_edid_modes(connector, edid);
 279         kfree(edid);
 280
 281         return ret;
 282 }
 283
 284 static enum drm_mode_status
 285 zx_hdmi_connector_mode_valid(struct drm_connector *connector,
 286                              struct drm_display_mode *mode)
 287 {
 288         return MODE_OK;
 289 }
 290
 291 static struct drm_connector_helper_funcs zx_hdmi_connector_helper_funcs = {
 292         .get_modes = zx_hdmi_connector_get_modes,
 293         .mode_valid = zx_hdmi_connector_mode_valid,
 294 };
 295
 296 static enum drm_connector_status
 297 zx_hdmi_connector_detect(struct drm_connector *connector, bool force)
 298 {
 299         struct zx_hdmi *hdmi = to_zx_hdmi(connector);
 300
 301         return (hdmi_readb(hdmi, TPI_HPD_RSEN) & TPI_HPD_CONNECTION) ?
 302                 connector_status_connected : connector_status_disconnected;
 303 }
 304
 305 static const struct drm_connector_funcs zx_hdmi_connector_funcs = {
 306         .fill_modes = drm_helper_probe_single_connector_modes,
 307         .detect = zx_hdmi_connector_detect,
 308         .destroy = drm_connector_cleanup,
 309         .reset = drm_atomic_helper_connector_reset,
 310         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 311         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 312 };
 313
 314 static int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
 315 {
 316         struct drm_encoder *encoder = &hdmi->encoder;
 317
 318         encoder->possible_crtcs = VOU_CRTC_MASK;
 319
 320         drm_encoder_init(drm, encoder, &zx_hdmi_encoder_funcs,
 321                          DRM_MODE_ENCODER_TMDS, NULL);
 322         drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);
 323
 324         hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
 325
 326         drm_connector_init(drm, &hdmi->connector, &zx_hdmi_connector_funcs,
 327                            DRM_MODE_CONNECTOR_HDMIA);
 328         drm_connector_helper_add(&hdmi->connector,
 329                                  &zx_hdmi_connector_helper_funcs);
 330
 331         drm_connector_attach_encoder(&hdmi->connector, encoder);
 332
 333         return 0;
 334 }
 335
 336 static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
 337 {
 338         struct zx_hdmi *hdmi = dev_id;
 339
 340         drm_helper_hpd_irq_event(hdmi->connector.dev);
 341
 342         return IRQ_HANDLED;
 343 }
 344
 345 static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
 346 {
 347         struct zx_hdmi *hdmi = dev_id;
 348         u8 lstat;
 349
 350         lstat = hdmi_readb(hdmi, L1_INTR_STAT);
 351
 352         /* Monitor detect/HPD interrupt */
 353         if (lstat & L1_INTR_STAT_INTR1) {
 354                 u8 stat;
 355
 356                 stat = hdmi_readb(hdmi, INTR1_STAT);
 357                 hdmi_writeb(hdmi, INTR1_STAT, stat);
 358
 359                 if (stat & INTR1_MONITOR_DETECT)
 360                         return IRQ_WAKE_THREAD;
 361         }
 362
 363         return IRQ_NONE;
 364 }
 365
 366 static int zx_hdmi_audio_startup(struct device *dev, void *data)
 367 {
 368         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 369         struct drm_encoder *encoder = &hdmi->encoder;
 370
 371         vou_inf_hdmi_audio_sel(encoder->crtc, VOU_HDMI_AUD_SPDIF);
 372
 373         return 0;
 374 }
 375
 376 static void zx_hdmi_audio_shutdown(struct device *dev, void *data)
 377 {
 378         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 379
 380         /* Disable audio input */
 381         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, 0);
 382 }
 383
 384 static inline int zx_hdmi_audio_get_n(unsigned int fs)
 385 {
 386         unsigned int n;
 387
 388         if (fs && (fs % 44100) == 0)
 389                 n = 6272 * (fs / 44100);
 390         else
 391                 n = fs * 128 / 1000;
 392
 393         return n;
 394 }
 395
 396 static int zx_hdmi_audio_hw_params(struct device *dev,
 397                                    void *data,
 398                                    struct hdmi_codec_daifmt *daifmt,
 399                                    struct hdmi_codec_params *params)
 400 {
 401         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 402         struct hdmi_audio_infoframe *cea = &params->cea;
 403         union hdmi_infoframe frame;
 404         int n;
 405
 406         /* We only support spdif for now */
 407         if (daifmt->fmt != HDMI_SPDIF) {
 408                 DRM_DEV_ERROR(hdmi->dev, "invalid daifmt %d\n", daifmt->fmt);
 409                 return -EINVAL;
 410         }
 411
 412         switch (params->sample_width) {
 413         case 16:
 414                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 415                                  SPDIF_SAMPLE_SIZE_16BIT);
 416                 break;
 417         case 20:
 418                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 419                                  SPDIF_SAMPLE_SIZE_20BIT);
 420                 break;
 421         case 24:
 422                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 423                                  SPDIF_SAMPLE_SIZE_24BIT);
 424                 break;
 425         default:
 426                 DRM_DEV_ERROR(hdmi->dev, "invalid sample width %d\n",
 427                               params->sample_width);
 428                 return -EINVAL;
 429         }
 430
 431         /* CTS is calculated by hardware, and we only need to take care of N */
 432         n = zx_hdmi_audio_get_n(params->sample_rate);
 433         hdmi_writeb(hdmi, N_SVAL1, n & 0xff);
 434         hdmi_writeb(hdmi, N_SVAL2, (n >> 8) & 0xff);
 435         hdmi_writeb(hdmi, N_SVAL3, (n >> 16) & 0xf);
 436
 437         /* Enable spdif mode */
 438         hdmi_writeb_mask(hdmi, AUD_MODE, SPDIF_EN, SPDIF_EN);
 439
 440         /* Enable audio input */
 441         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, AUD_IN_EN);
 442
 443         memcpy(&frame.audio, cea, sizeof(*cea));
 444
 445         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AUDIO);
 446 }
 447
 448 static int zx_hdmi_audio_digital_mute(struct device *dev, void *data,
 449                                       bool enable)
 450 {
 451         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 452
 453         if (enable)
 454                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE,
 455                                  TPI_AUD_MUTE);
 456         else
 457                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE, 0);
 458
 459         return 0;
 460 }
 461
 462 static int zx_hdmi_audio_get_eld(struct device *dev, void *data,
 463                                  uint8_t *buf, size_t len)
 464 {
 465         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 466         struct drm_connector *connector = &hdmi->connector;
 467
 468         memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
 469
 470         return 0;
 471 }
 472
 473 static const struct hdmi_codec_ops zx_hdmi_codec_ops = {
 474         .audio_startup = zx_hdmi_audio_startup,
 475         .hw_params = zx_hdmi_audio_hw_params,
 476         .audio_shutdown = zx_hdmi_audio_shutdown,
 477         .digital_mute = zx_hdmi_audio_digital_mute,
 478         .get_eld = zx_hdmi_audio_get_eld,
 479 };
 480
 481 static struct hdmi_codec_pdata zx_hdmi_codec_pdata = {
 482         .ops = &zx_hdmi_codec_ops,
 483         .spdif = 1,
 484 };
 485
 486 static int zx_hdmi_audio_register(struct zx_hdmi *hdmi)
 487 {
 488         struct platform_device *pdev;
 489
 490         pdev = platform_device_register_data(hdmi->dev, HDMI_CODEC_DRV_NAME,
 491                                              PLATFORM_DEVID_AUTO,
 492                                              &zx_hdmi_codec_pdata,
 493                                              sizeof(zx_hdmi_codec_pdata));
 494         if (IS_ERR(pdev))
 495                 return PTR_ERR(pdev);
 496
 497         hdmi->audio_pdev = pdev;
 498
 499         return 0;
 500 }
 501
 502 static int zx_hdmi_i2c_read(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 503 {
 504         int len = msg->len;
 505         u8 *buf = msg->buf;
 506         int retry = 0;
 507         int ret = 0;
 508
 509         /* Bits [9:8] of bytes */
 510         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
 511         /* Bits [7:0] of bytes */
 512         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);
 513
 514         /* Clear FIFO */
 515         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK, DDC_CMD_CLEAR_FIFO);
 516
 517         /* Kick off the read */
 518         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK,
 519                          DDC_CMD_SEQUENTIAL_READ);
 520
 521         while (len > 0) {
 522                 int cnt, i;
 523
 524                 /* FIFO needs some time to get ready */
 525                 usleep_range(500, 1000);
 526
 527                 cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
 528                 if (cnt == 0) {
 529                         if (++retry > 5) {
 530                                 DRM_DEV_ERROR(hdmi->dev,
 531                                               "DDC FIFO read timed out!");
 532                                 return -ETIMEDOUT;
 533                         }
 534                         continue;
 535                 }
 536
 537                 for (i = 0; i < cnt; i++)
 538                         *buf++ = hdmi_readb(hdmi, ZX_DDC_DATA);
 539                 len -= cnt;
 540         }
 541
 542         return ret;
 543 }
 544
 545 static int zx_hdmi_i2c_write(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 546 {
 547         /*
 548          * The DDC I2C adapter is only for reading EDID data, so we assume
 549          * that the write to this adapter must be the EDID data offset.
 550          */
 551         if ((msg->len != 1) ||
 552             ((msg->addr != DDC_ADDR) && (msg->addr != DDC_SEGMENT_ADDR)))
 553                 return -EINVAL;
 554
 555         if (msg->addr == DDC_SEGMENT_ADDR)
 556                 hdmi_writeb(hdmi, ZX_DDC_SEGM, msg->addr << 1);
 557         else if (msg->addr == DDC_ADDR)
 558                 hdmi_writeb(hdmi, ZX_DDC_ADDR, msg->addr << 1);
 559
 560         hdmi_writeb(hdmi, ZX_DDC_OFFSET, msg->buf[0]);
 561
 562         return 0;
 563 }
 564
 565 static int zx_hdmi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 566                             int num)
 567 {
 568         struct zx_hdmi *hdmi = i2c_get_adapdata(adap);
 569         struct zx_hdmi_i2c *ddc = hdmi->ddc;
 570         int i, ret = 0;
 571
 572         mutex_lock(&ddc->lock);
 573
 574         /* Enable DDC master access */
 575         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, HW_DDC_MASTER);
 576
 577         for (i = 0; i < num; i++) {
 578                 DRM_DEV_DEBUG(hdmi->dev,
 579                               "xfer: num: %d/%d, len: %d, flags: %#x\n",
 580                               i + 1, num, msgs[i].len, msgs[i].flags);
 581
 582                 if (msgs[i].flags & I2C_M_RD)
 583                         ret = zx_hdmi_i2c_read(hdmi, &msgs[i]);
 584                 else
 585                         ret = zx_hdmi_i2c_write(hdmi, &msgs[i]);
 586
 587                 if (ret < 0)
 588                         break;
 589         }
 590
 591         if (!ret)
 592                 ret = num;
 593
 594         /* Disable DDC master access */
 595         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, 0);
 596
 597         mutex_unlock(&ddc->lock);
 598
 599         return ret;
 600 }
 601
 602 static u32 zx_hdmi_i2c_func(struct i2c_adapter *adapter)
 603 {
 604         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 605 }
 606
 607 static const struct i2c_algorithm zx_hdmi_algorithm = {
 608         .master_xfer    = zx_hdmi_i2c_xfer,
 609         .functionality  = zx_hdmi_i2c_func,
 610 };
 611
 612 static int zx_hdmi_ddc_register(struct zx_hdmi *hdmi)
 613 {
 614         struct i2c_adapter *adap;
 615         struct zx_hdmi_i2c *ddc;
 616         int ret;
 617
 618         ddc = devm_kzalloc(hdmi->dev, sizeof(*ddc), GFP_KERNEL);
 619         if (!ddc)
 620                 return -ENOMEM;
 621
 622         hdmi->ddc = ddc;
 623         mutex_init(&ddc->lock);
 624
 625         adap = &ddc->adap;
 626         adap->owner = THIS_MODULE;
 627         adap->class = I2C_CLASS_DDC;
 628         adap->dev.parent = hdmi->dev;
 629         adap->algo = &zx_hdmi_algorithm;
 630         snprintf(adap->name, sizeof(adap->name), "zx hdmi i2c");
 631
 632         ret = i2c_add_adapter(adap);
 633         if (ret) {
 634                 DRM_DEV_ERROR(hdmi->dev, "failed to add I2C adapter: %d\n",
 635                               ret);
 636                 return ret;
 637         }
 638
 639         i2c_set_adapdata(adap, hdmi);
 640
 641         return 0;
 642 }
 643
 644 static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
 645 {
 646         struct platform_device *pdev = to_platform_device(dev);
 647         struct drm_device *drm = data;
 648         struct resource *res;
 649         struct zx_hdmi *hdmi;
 650         int irq;
 651         int ret;
 652
 653         hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 654         if (!hdmi)
 655                 return -ENOMEM;
 656
 657         hdmi->dev = dev;
 658         hdmi->drm = drm;
 659
 660         dev_set_drvdata(dev, hdmi);
 661
 662         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 663         hdmi->mmio = devm_ioremap_resource(dev, res);
 664         if (IS_ERR(hdmi->mmio)) {
 665                 ret = PTR_ERR(hdmi->mmio);
 666                 DRM_DEV_ERROR(dev, "failed to remap hdmi region: %d\n", ret);
 667                 return ret;
 668         }
 669
 670         irq = platform_get_irq(pdev, 0);
 671         if (irq < 0)
 672                 return irq;
 673
 674         hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
 675         if (IS_ERR(hdmi->cec_clk)) {
 676                 ret = PTR_ERR(hdmi->cec_clk);
 677                 DRM_DEV_ERROR(dev, "failed to get cec_clk: %d\n", ret);
 678                 return ret;
 679         }
 680
 681         hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
 682         if (IS_ERR(hdmi->osc_clk)) {
 683                 ret = PTR_ERR(hdmi->osc_clk);
 684                 DRM_DEV_ERROR(dev, "failed to get osc_clk: %d\n", ret);
 685                 return ret;
 686         }
 687
 688         hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
 689         if (IS_ERR(hdmi->xclk)) {
 690                 ret = PTR_ERR(hdmi->xclk);
 691                 DRM_DEV_ERROR(dev, "failed to get xclk: %d\n", ret);
 692                 return ret;
 693         }
 694
 695         ret = zx_hdmi_ddc_register(hdmi);
 696         if (ret) {
 697                 DRM_DEV_ERROR(dev, "failed to register ddc: %d\n", ret);
 698                 return ret;
 699         }
 700
 701         ret = zx_hdmi_audio_register(hdmi);
 702         if (ret) {
 703                 DRM_DEV_ERROR(dev, "failed to register audio: %d\n", ret);
 704                 return ret;
 705         }
 706
 707         ret = zx_hdmi_register(drm, hdmi);
 708         if (ret) {
 709                 DRM_DEV_ERROR(dev, "failed to register hdmi: %d\n", ret);
 710                 return ret;
 711         }
 712
 713         ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
 714                                         zx_hdmi_irq_thread, IRQF_SHARED,
 715                                         dev_name(dev), hdmi);
 716         if (ret) {
 717                 DRM_DEV_ERROR(dev, "failed to request threaded irq: %d\n", ret);
 718                 return ret;
 719         }
 720
 721         return 0;
 722 }
 723
 724 static void zx_hdmi_unbind(struct device *dev, struct device *master,
 725                            void *data)
 726 {
 727         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 728
 729         hdmi->connector.funcs->destroy(&hdmi->connector);
 730         hdmi->encoder.funcs->destroy(&hdmi->encoder);
 731
 732         if (hdmi->audio_pdev)
 733                 platform_device_unregister(hdmi->audio_pdev);
 734 }
 735
 736 static const struct component_ops zx_hdmi_component_ops = {
 737         .bind = zx_hdmi_bind,
 738         .unbind = zx_hdmi_unbind,
 739 };
 740
 741 static int zx_hdmi_probe(struct platform_device *pdev)
 742 {
 743         return component_add(&pdev->dev, &zx_hdmi_component_ops);
 744 }
 745
 746 static int zx_hdmi_remove(struct platform_device *pdev)
 747 {
 748         component_del(&pdev->dev, &zx_hdmi_component_ops);
 749         return 0;
 750 }
 751
 752 static const struct of_device_id zx_hdmi_of_match[] = {
 753         { .compatible = "zte,zx296718-hdmi", },
 754         { /* end */ },
 755 };
 756 MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);
 757
 758 struct platform_driver zx_hdmi_driver = {
 759         .probe = zx_hdmi_probe,
 760         .remove = zx_hdmi_remove,
 761         .driver = {
 762                 .name = "zx-hdmi",
 763                 .of_match_table = zx_hdmi_of_match,
 764         },
 765 };