drivers/gpu/drm/zte/zx_hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2016 Linaro Ltd.
   4  * Copyright 2016 ZTE Corporation.
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/component.h>
   9 #include <linux/delay.h>
  10 #include <linux/err.h>
  11 #include <linux/hdmi.h>
  12 #include <linux/irq.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/module.h>
  15 #include <linux/mutex.h>
  16 #include <linux/of_device.h>
  17
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_edid.h>
  20 #include <drm/drm_of.h>
  21 #include <drm/drm_probe_helper.h>
  22 #include <drm/drm_print.h>
  23 #include <drm/drm_simple_kms_helper.h>
  24
  25 #include <sound/hdmi-codec.h>
  26
  27 #include "zx_hdmi_regs.h"
  28 #include "zx_vou.h"
  29
  30 #define ZX_HDMI_INFOFRAME_SIZE          31
  31 #define DDC_SEGMENT_ADDR                0x30
  32
  33 struct zx_hdmi_i2c {
  34         struct i2c_adapter adap;
  35         struct mutex lock;
  36 };
  37
  38 struct zx_hdmi {
  39         struct drm_connector connector;
  40         struct drm_encoder encoder;
  41         struct zx_hdmi_i2c *ddc;
  42         struct device *dev;
  43         struct drm_device *drm;
  44         void __iomem *mmio;
  45         struct clk *cec_clk;
  46         struct clk *osc_clk;
  47         struct clk *xclk;
  48         bool sink_is_hdmi;
  49         bool sink_has_audio;
  50         struct platform_device *audio_pdev;
  51 };
  52
  53 #define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)
  54
  55 static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
  56 {
  57         return readl_relaxed(hdmi->mmio + offset * 4);
  58 }
  59
  60 static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
  61 {
  62         writel_relaxed(val, hdmi->mmio + offset * 4);
  63 }
  64
  65 static inline void hdmi_writeb_mask(struct zx_hdmi *hdmi, u16 offset,
  66                                     u8 mask, u8 val)
  67 {
  68         u8 tmp;
  69
  70         tmp = hdmi_readb(hdmi, offset);
  71         tmp = (tmp & ~mask) | (val & mask);
  72         hdmi_writeb(hdmi, offset, tmp);
  73 }
  74
  75 static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
  76                                    union hdmi_infoframe *frame, u8 fsel)
  77 {
  78         u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
  79         int num;
  80         int i;
  81
  82         hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);
  83
  84         num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
  85         if (num < 0) {
  86                 DRM_DEV_ERROR(hdmi->dev, "failed to pack infoframe: %d\n", num);
  87                 return num;
  88         }
  89
  90         for (i = 0; i < num; i++)
  91                 hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);
  92
  93         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_RPT,
  94                          TPI_INFO_TRANS_RPT);
  95         hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_EN,
  96                          TPI_INFO_TRANS_EN);
  97
  98         return num;
  99 }
 100
 101 static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
 102                                     struct drm_display_mode *mode)
 103 {
 104         union hdmi_infoframe frame;
 105         int ret;
 106
 107         ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
 108                                                           &hdmi->connector,
 109                                                           mode);
 110         if (ret) {
 111                 DRM_DEV_ERROR(hdmi->dev, "failed to get vendor infoframe: %d\n",
 112                               ret);
 113                 return ret;
 114         }
 115
 116         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_VSIF);
 117 }
 118
 119 static int zx_hdmi_config_video_avi(struct zx_hdmi *hdmi,
 120                                     struct drm_display_mode *mode)
 121 {
 122         union hdmi_infoframe frame;
 123         int ret;
 124
 125         ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi,
 126                                                        &hdmi->connector,
 127                                                        mode);
 128         if (ret) {
 129                 DRM_DEV_ERROR(hdmi->dev, "failed to get avi infoframe: %d\n",
 130                               ret);
 131                 return ret;
 132         }
 133
 134         /* We always use YUV444 for HDMI output. */
 135         frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
 136
 137         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AVI);
 138 }
 139
 140 static void zx_hdmi_encoder_mode_set(struct drm_encoder *encoder,
 141                                      struct drm_display_mode *mode,
 142                                      struct drm_display_mode *adj_mode)
 143 {
 144         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 145
 146         if (hdmi->sink_is_hdmi) {
 147                 zx_hdmi_config_video_avi(hdmi, mode);
 148                 zx_hdmi_config_video_vsi(hdmi, mode);
 149         }
 150 }
 151
 152 static void zx_hdmi_phy_start(struct zx_hdmi *hdmi)
 153 {
 154         /* Copy from ZTE BSP code */
 155         hdmi_writeb(hdmi, 0x222, 0x0);
 156         hdmi_writeb(hdmi, 0x224, 0x4);
 157         hdmi_writeb(hdmi, 0x909, 0x0);
 158         hdmi_writeb(hdmi, 0x7b0, 0x90);
 159         hdmi_writeb(hdmi, 0x7b1, 0x00);
 160         hdmi_writeb(hdmi, 0x7b2, 0xa7);
 161         hdmi_writeb(hdmi, 0x7b8, 0xaa);
 162         hdmi_writeb(hdmi, 0x7b2, 0xa7);
 163         hdmi_writeb(hdmi, 0x7b3, 0x0f);
 164         hdmi_writeb(hdmi, 0x7b4, 0x0f);
 165         hdmi_writeb(hdmi, 0x7b5, 0x55);
 166         hdmi_writeb(hdmi, 0x7b7, 0x03);
 167         hdmi_writeb(hdmi, 0x7b9, 0x12);
 168         hdmi_writeb(hdmi, 0x7ba, 0x32);
 169         hdmi_writeb(hdmi, 0x7bc, 0x68);
 170         hdmi_writeb(hdmi, 0x7be, 0x40);
 171         hdmi_writeb(hdmi, 0x7bf, 0x84);
 172         hdmi_writeb(hdmi, 0x7c1, 0x0f);
 173         hdmi_writeb(hdmi, 0x7c8, 0x02);
 174         hdmi_writeb(hdmi, 0x7c9, 0x03);
 175         hdmi_writeb(hdmi, 0x7ca, 0x40);
 176         hdmi_writeb(hdmi, 0x7dc, 0x31);
 177         hdmi_writeb(hdmi, 0x7e2, 0x04);
 178         hdmi_writeb(hdmi, 0x7e0, 0x06);
 179         hdmi_writeb(hdmi, 0x7cb, 0x68);
 180         hdmi_writeb(hdmi, 0x7f9, 0x02);
 181         hdmi_writeb(hdmi, 0x7b6, 0x02);
 182         hdmi_writeb(hdmi, 0x7f3, 0x0);
 183 }
 184
 185 static void zx_hdmi_hw_enable(struct zx_hdmi *hdmi)
 186 {
 187         /* Enable pclk */
 188         hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, CLKPWD_PDIDCK);
 189
 190         /* Enable HDMI for TX */
 191         hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, FUNC_HDMI_EN);
 192
 193         /* Enable deep color packet */
 194         hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
 195
 196         /* Enable HDMI/MHL mode for output */
 197         hdmi_writeb_mask(hdmi, TEST_TXCTRL, TEST_TXCTRL_HDMI_MODE,
 198                          TEST_TXCTRL_HDMI_MODE);
 199
 200         /* Configure reg_qc_sel */
 201         hdmi_writeb(hdmi, HDMICTL4, 0x3);
 202
 203         /* Enable interrupt */
 204         hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT,
 205                          INTR1_MONITOR_DETECT);
 206
 207         /* Start up phy */
 208         zx_hdmi_phy_start(hdmi);
 209 }
 210
 211 static void zx_hdmi_hw_disable(struct zx_hdmi *hdmi)
 212 {
 213         /* Disable interrupt */
 214         hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT, 0);
 215
 216         /* Disable deep color packet */
 217         hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
 218
 219         /* Disable HDMI for TX */
 220         hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, 0);
 221
 222         /* Disable pclk */
 223         hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, 0);
 224 }
 225
 226 static void zx_hdmi_encoder_enable(struct drm_encoder *encoder)
 227 {
 228         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 229
 230         clk_prepare_enable(hdmi->cec_clk);
 231         clk_prepare_enable(hdmi->osc_clk);
 232         clk_prepare_enable(hdmi->xclk);
 233
 234         zx_hdmi_hw_enable(hdmi);
 235
 236         vou_inf_enable(VOU_HDMI, encoder->crtc);
 237 }
 238
 239 static void zx_hdmi_encoder_disable(struct drm_encoder *encoder)
 240 {
 241         struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
 242
 243         vou_inf_disable(VOU_HDMI, encoder->crtc);
 244
 245         zx_hdmi_hw_disable(hdmi);
 246
 247         clk_disable_unprepare(hdmi->xclk);
 248         clk_disable_unprepare(hdmi->osc_clk);
 249         clk_disable_unprepare(hdmi->cec_clk);
 250 }
 251
 252 static const struct drm_encoder_helper_funcs zx_hdmi_encoder_helper_funcs = {
 253         .enable = zx_hdmi_encoder_enable,
 254         .disable = zx_hdmi_encoder_disable,
 255         .mode_set = zx_hdmi_encoder_mode_set,
 256 };
 257
 258 static int zx_hdmi_connector_get_modes(struct drm_connector *connector)
 259 {
 260         struct zx_hdmi *hdmi = to_zx_hdmi(connector);
 261         struct edid *edid;
 262         int ret;
 263
 264         edid = drm_get_edid(connector, &hdmi->ddc->adap);
 265         if (!edid)
 266                 return 0;
 267
 268         hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
 269         hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
 270         drm_connector_update_edid_property(connector, edid);
 271         ret = drm_add_edid_modes(connector, edid);
 272         kfree(edid);
 273
 274         return ret;
 275 }
 276
 277 static enum drm_mode_status
 278 zx_hdmi_connector_mode_valid(struct drm_connector *connector,
 279                              struct drm_display_mode *mode)
 280 {
 281         return MODE_OK;
 282 }
 283
 284 static struct drm_connector_helper_funcs zx_hdmi_connector_helper_funcs = {
 285         .get_modes = zx_hdmi_connector_get_modes,
 286         .mode_valid = zx_hdmi_connector_mode_valid,
 287 };
 288
 289 static enum drm_connector_status
 290 zx_hdmi_connector_detect(struct drm_connector *connector, bool force)
 291 {
 292         struct zx_hdmi *hdmi = to_zx_hdmi(connector);
 293
 294         return (hdmi_readb(hdmi, TPI_HPD_RSEN) & TPI_HPD_CONNECTION) ?
 295                 connector_status_connected : connector_status_disconnected;
 296 }
 297
 298 static const struct drm_connector_funcs zx_hdmi_connector_funcs = {
 299         .fill_modes = drm_helper_probe_single_connector_modes,
 300         .detect = zx_hdmi_connector_detect,
 301         .destroy = drm_connector_cleanup,
 302         .reset = drm_atomic_helper_connector_reset,
 303         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 304         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 305 };
 306
 307 static int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
 308 {
 309         struct drm_encoder *encoder = &hdmi->encoder;
 310
 311         encoder->possible_crtcs = VOU_CRTC_MASK;
 312
 313         drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
 314         drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);
 315
 316         hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
 317
 318         drm_connector_init_with_ddc(drm, &hdmi->connector,
 319                                     &zx_hdmi_connector_funcs,
 320                                     DRM_MODE_CONNECTOR_HDMIA,
 321                                     &hdmi->ddc->adap);
 322         drm_connector_helper_add(&hdmi->connector,
 323                                  &zx_hdmi_connector_helper_funcs);
 324
 325         drm_connector_attach_encoder(&hdmi->connector, encoder);
 326
 327         return 0;
 328 }
 329
 330 static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
 331 {
 332         struct zx_hdmi *hdmi = dev_id;
 333
 334         drm_helper_hpd_irq_event(hdmi->connector.dev);
 335
 336         return IRQ_HANDLED;
 337 }
 338
 339 static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
 340 {
 341         struct zx_hdmi *hdmi = dev_id;
 342         u8 lstat;
 343
 344         lstat = hdmi_readb(hdmi, L1_INTR_STAT);
 345
 346         /* Monitor detect/HPD interrupt */
 347         if (lstat & L1_INTR_STAT_INTR1) {
 348                 u8 stat;
 349
 350                 stat = hdmi_readb(hdmi, INTR1_STAT);
 351                 hdmi_writeb(hdmi, INTR1_STAT, stat);
 352
 353                 if (stat & INTR1_MONITOR_DETECT)
 354                         return IRQ_WAKE_THREAD;
 355         }
 356
 357         return IRQ_NONE;
 358 }
 359
 360 static int zx_hdmi_audio_startup(struct device *dev, void *data)
 361 {
 362         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 363         struct drm_encoder *encoder = &hdmi->encoder;
 364
 365         vou_inf_hdmi_audio_sel(encoder->crtc, VOU_HDMI_AUD_SPDIF);
 366
 367         return 0;
 368 }
 369
 370 static void zx_hdmi_audio_shutdown(struct device *dev, void *data)
 371 {
 372         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 373
 374         /* Disable audio input */
 375         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, 0);
 376 }
 377
 378 static inline int zx_hdmi_audio_get_n(unsigned int fs)
 379 {
 380         unsigned int n;
 381
 382         if (fs && (fs % 44100) == 0)
 383                 n = 6272 * (fs / 44100);
 384         else
 385                 n = fs * 128 / 1000;
 386
 387         return n;
 388 }
 389
 390 static int zx_hdmi_audio_hw_params(struct device *dev,
 391                                    void *data,
 392                                    struct hdmi_codec_daifmt *daifmt,
 393                                    struct hdmi_codec_params *params)
 394 {
 395         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 396         struct hdmi_audio_infoframe *cea = &params->cea;
 397         union hdmi_infoframe frame;
 398         int n;
 399
 400         /* We only support spdif for now */
 401         if (daifmt->fmt != HDMI_SPDIF) {
 402                 DRM_DEV_ERROR(hdmi->dev, "invalid daifmt %d\n", daifmt->fmt);
 403                 return -EINVAL;
 404         }
 405
 406         switch (params->sample_width) {
 407         case 16:
 408                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 409                                  SPDIF_SAMPLE_SIZE_16BIT);
 410                 break;
 411         case 20:
 412                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 413                                  SPDIF_SAMPLE_SIZE_20BIT);
 414                 break;
 415         case 24:
 416                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, SPDIF_SAMPLE_SIZE_MASK,
 417                                  SPDIF_SAMPLE_SIZE_24BIT);
 418                 break;
 419         default:
 420                 DRM_DEV_ERROR(hdmi->dev, "invalid sample width %d\n",
 421                               params->sample_width);
 422                 return -EINVAL;
 423         }
 424
 425         /* CTS is calculated by hardware, and we only need to take care of N */
 426         n = zx_hdmi_audio_get_n(params->sample_rate);
 427         hdmi_writeb(hdmi, N_SVAL1, n & 0xff);
 428         hdmi_writeb(hdmi, N_SVAL2, (n >> 8) & 0xff);
 429         hdmi_writeb(hdmi, N_SVAL3, (n >> 16) & 0xf);
 430
 431         /* Enable spdif mode */
 432         hdmi_writeb_mask(hdmi, AUD_MODE, SPDIF_EN, SPDIF_EN);
 433
 434         /* Enable audio input */
 435         hdmi_writeb_mask(hdmi, AUD_EN, AUD_IN_EN, AUD_IN_EN);
 436
 437         memcpy(&frame.audio, cea, sizeof(*cea));
 438
 439         return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AUDIO);
 440 }
 441
 442 static int zx_hdmi_audio_mute(struct device *dev, void *data,
 443                               bool enable, int direction)
 444 {
 445         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 446
 447         if (enable)
 448                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE,
 449                                  TPI_AUD_MUTE);
 450         else
 451                 hdmi_writeb_mask(hdmi, TPI_AUD_CONFIG, TPI_AUD_MUTE, 0);
 452
 453         return 0;
 454 }
 455
 456 static int zx_hdmi_audio_get_eld(struct device *dev, void *data,
 457                                  uint8_t *buf, size_t len)
 458 {
 459         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 460         struct drm_connector *connector = &hdmi->connector;
 461
 462         memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
 463
 464         return 0;
 465 }
 466
 467 static const struct hdmi_codec_ops zx_hdmi_codec_ops = {
 468         .audio_startup = zx_hdmi_audio_startup,
 469         .hw_params = zx_hdmi_audio_hw_params,
 470         .audio_shutdown = zx_hdmi_audio_shutdown,
 471         .mute_stream = zx_hdmi_audio_mute,
 472         .get_eld = zx_hdmi_audio_get_eld,
 473         .no_capture_mute = 1,
 474 };
 475
 476 static struct hdmi_codec_pdata zx_hdmi_codec_pdata = {
 477         .ops = &zx_hdmi_codec_ops,
 478         .spdif = 1,
 479 };
 480
 481 static int zx_hdmi_audio_register(struct zx_hdmi *hdmi)
 482 {
 483         struct platform_device *pdev;
 484
 485         pdev = platform_device_register_data(hdmi->dev, HDMI_CODEC_DRV_NAME,
 486                                              PLATFORM_DEVID_AUTO,
 487                                              &zx_hdmi_codec_pdata,
 488                                              sizeof(zx_hdmi_codec_pdata));
 489         if (IS_ERR(pdev))
 490                 return PTR_ERR(pdev);
 491
 492         hdmi->audio_pdev = pdev;
 493
 494         return 0;
 495 }
 496
 497 static int zx_hdmi_i2c_read(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 498 {
 499         int len = msg->len;
 500         u8 *buf = msg->buf;
 501         int retry = 0;
 502         int ret = 0;
 503
 504         /* Bits [9:8] of bytes */
 505         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
 506         /* Bits [7:0] of bytes */
 507         hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);
 508
 509         /* Clear FIFO */
 510         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK, DDC_CMD_CLEAR_FIFO);
 511
 512         /* Kick off the read */
 513         hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK,
 514                          DDC_CMD_SEQUENTIAL_READ);
 515
 516         while (len > 0) {
 517                 int cnt, i;
 518
 519                 /* FIFO needs some time to get ready */
 520                 usleep_range(500, 1000);
 521
 522                 cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
 523                 if (cnt == 0) {
 524                         if (++retry > 5) {
 525                                 DRM_DEV_ERROR(hdmi->dev,
 526                                               "DDC FIFO read timed out!");
 527                                 return -ETIMEDOUT;
 528                         }
 529                         continue;
 530                 }
 531
 532                 for (i = 0; i < cnt; i++)
 533                         *buf++ = hdmi_readb(hdmi, ZX_DDC_DATA);
 534                 len -= cnt;
 535         }
 536
 537         return ret;
 538 }
 539
 540 static int zx_hdmi_i2c_write(struct zx_hdmi *hdmi, struct i2c_msg *msg)
 541 {
 542         /*
 543          * The DDC I2C adapter is only for reading EDID data, so we assume
 544          * that the write to this adapter must be the EDID data offset.
 545          */
 546         if ((msg->len != 1) ||
 547             ((msg->addr != DDC_ADDR) && (msg->addr != DDC_SEGMENT_ADDR)))
 548                 return -EINVAL;
 549
 550         if (msg->addr == DDC_SEGMENT_ADDR)
 551                 hdmi_writeb(hdmi, ZX_DDC_SEGM, msg->addr << 1);
 552         else if (msg->addr == DDC_ADDR)
 553                 hdmi_writeb(hdmi, ZX_DDC_ADDR, msg->addr << 1);
 554
 555         hdmi_writeb(hdmi, ZX_DDC_OFFSET, msg->buf[0]);
 556
 557         return 0;
 558 }
 559
 560 static int zx_hdmi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 561                             int num)
 562 {
 563         struct zx_hdmi *hdmi = i2c_get_adapdata(adap);
 564         struct zx_hdmi_i2c *ddc = hdmi->ddc;
 565         int i, ret = 0;
 566
 567         mutex_lock(&ddc->lock);
 568
 569         /* Enable DDC master access */
 570         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, HW_DDC_MASTER);
 571
 572         for (i = 0; i < num; i++) {
 573                 DRM_DEV_DEBUG(hdmi->dev,
 574                               "xfer: num: %d/%d, len: %d, flags: %#x\n",
 575                               i + 1, num, msgs[i].len, msgs[i].flags);
 576
 577                 if (msgs[i].flags & I2C_M_RD)
 578                         ret = zx_hdmi_i2c_read(hdmi, &msgs[i]);
 579                 else
 580                         ret = zx_hdmi_i2c_write(hdmi, &msgs[i]);
 581
 582                 if (ret < 0)
 583                         break;
 584         }
 585
 586         if (!ret)
 587                 ret = num;
 588
 589         /* Disable DDC master access */
 590         hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, 0);
 591
 592         mutex_unlock(&ddc->lock);
 593
 594         return ret;
 595 }
 596
 597 static u32 zx_hdmi_i2c_func(struct i2c_adapter *adapter)
 598 {
 599         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 600 }
 601
 602 static const struct i2c_algorithm zx_hdmi_algorithm = {
 603         .master_xfer    = zx_hdmi_i2c_xfer,
 604         .functionality  = zx_hdmi_i2c_func,
 605 };
 606
 607 static int zx_hdmi_ddc_register(struct zx_hdmi *hdmi)
 608 {
 609         struct i2c_adapter *adap;
 610         struct zx_hdmi_i2c *ddc;
 611         int ret;
 612
 613         ddc = devm_kzalloc(hdmi->dev, sizeof(*ddc), GFP_KERNEL);
 614         if (!ddc)
 615                 return -ENOMEM;
 616
 617         hdmi->ddc = ddc;
 618         mutex_init(&ddc->lock);
 619
 620         adap = &ddc->adap;
 621         adap->owner = THIS_MODULE;
 622         adap->class = I2C_CLASS_DDC;
 623         adap->dev.parent = hdmi->dev;
 624         adap->algo = &zx_hdmi_algorithm;
 625         snprintf(adap->name, sizeof(adap->name), "zx hdmi i2c");
 626
 627         ret = i2c_add_adapter(adap);
 628         if (ret) {
 629                 DRM_DEV_ERROR(hdmi->dev, "failed to add I2C adapter: %d\n",
 630                               ret);
 631                 return ret;
 632         }
 633
 634         i2c_set_adapdata(adap, hdmi);
 635
 636         return 0;
 637 }
 638
 639 static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
 640 {
 641         struct platform_device *pdev = to_platform_device(dev);
 642         struct drm_device *drm = data;
 643         struct resource *res;
 644         struct zx_hdmi *hdmi;
 645         int irq;
 646         int ret;
 647
 648         hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 649         if (!hdmi)
 650                 return -ENOMEM;
 651
 652         hdmi->dev = dev;
 653         hdmi->drm = drm;
 654
 655         dev_set_drvdata(dev, hdmi);
 656
 657         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 658         hdmi->mmio = devm_ioremap_resource(dev, res);
 659         if (IS_ERR(hdmi->mmio)) {
 660                 ret = PTR_ERR(hdmi->mmio);
 661                 DRM_DEV_ERROR(dev, "failed to remap hdmi region: %d\n", ret);
 662                 return ret;
 663         }
 664
 665         irq = platform_get_irq(pdev, 0);
 666         if (irq < 0)
 667                 return irq;
 668
 669         hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
 670         if (IS_ERR(hdmi->cec_clk)) {
 671                 ret = PTR_ERR(hdmi->cec_clk);
 672                 DRM_DEV_ERROR(dev, "failed to get cec_clk: %d\n", ret);
 673                 return ret;
 674         }
 675
 676         hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
 677         if (IS_ERR(hdmi->osc_clk)) {
 678                 ret = PTR_ERR(hdmi->osc_clk);
 679                 DRM_DEV_ERROR(dev, "failed to get osc_clk: %d\n", ret);
 680                 return ret;
 681         }
 682
 683         hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
 684         if (IS_ERR(hdmi->xclk)) {
 685                 ret = PTR_ERR(hdmi->xclk);
 686                 DRM_DEV_ERROR(dev, "failed to get xclk: %d\n", ret);
 687                 return ret;
 688         }
 689
 690         ret = zx_hdmi_ddc_register(hdmi);
 691         if (ret) {
 692                 DRM_DEV_ERROR(dev, "failed to register ddc: %d\n", ret);
 693                 return ret;
 694         }
 695
 696         ret = zx_hdmi_audio_register(hdmi);
 697         if (ret) {
 698                 DRM_DEV_ERROR(dev, "failed to register audio: %d\n", ret);
 699                 return ret;
 700         }
 701
 702         ret = zx_hdmi_register(drm, hdmi);
 703         if (ret) {
 704                 DRM_DEV_ERROR(dev, "failed to register hdmi: %d\n", ret);
 705                 return ret;
 706         }
 707
 708         ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
 709                                         zx_hdmi_irq_thread, IRQF_SHARED,
 710                                         dev_name(dev), hdmi);
 711         if (ret) {
 712                 DRM_DEV_ERROR(dev, "failed to request threaded irq: %d\n", ret);
 713                 return ret;
 714         }
 715
 716         return 0;
 717 }
 718
 719 static void zx_hdmi_unbind(struct device *dev, struct device *master,
 720                            void *data)
 721 {
 722         struct zx_hdmi *hdmi = dev_get_drvdata(dev);
 723
 724         hdmi->connector.funcs->destroy(&hdmi->connector);
 725         hdmi->encoder.funcs->destroy(&hdmi->encoder);
 726
 727         if (hdmi->audio_pdev)
 728                 platform_device_unregister(hdmi->audio_pdev);
 729 }
 730
 731 static const struct component_ops zx_hdmi_component_ops = {
 732         .bind = zx_hdmi_bind,
 733         .unbind = zx_hdmi_unbind,
 734 };
 735
 736 static int zx_hdmi_probe(struct platform_device *pdev)
 737 {
 738         return component_add(&pdev->dev, &zx_hdmi_component_ops);
 739 }
 740
 741 static int zx_hdmi_remove(struct platform_device *pdev)
 742 {
 743         component_del(&pdev->dev, &zx_hdmi_component_ops);
 744         return 0;
 745 }
 746
 747 static const struct of_device_id zx_hdmi_of_match[] = {
 748         { .compatible = "zte,zx296718-hdmi", },
 749         { /* end */ },
 750 };
 751 MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);
 752
 753 struct platform_driver zx_hdmi_driver = {
 754         .probe = zx_hdmi_probe,
 755         .remove = zx_hdmi_remove,
 756         .driver = {
 757                 .name = "zx-hdmi",
 758                 .of_match_table = zx_hdmi_of_match,
 759         },
 760 };