drivers/gpu/drm/msm/hdmi/hdmi_connector.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/gpio.h>
  19 #include <linux/pinctrl/consumer.h>
  20
  21 #include "msm_kms.h"
  22 #include "hdmi.h"
  23
  24 struct hdmi_connector {
  25         struct drm_connector base;
  26         struct hdmi *hdmi;
  27         struct work_struct hpd_work;
  28 };
  29 #define to_hdmi_connector(x) container_of(x, struct hdmi_connector, base)
  30
  31 static int gpio_config(struct hdmi *hdmi, bool on)
  32 {
  33         struct device *dev = &hdmi->pdev->dev;
  34         const struct hdmi_platform_config *config = hdmi->config;
  35         int ret;
  36
  37         if (on) {
  38                 ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
  39                 if (ret) {
  40                         dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
  41                                 "HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
  42                         goto error1;
  43                 }
  44                 gpio_set_value_cansleep(config->ddc_clk_gpio, 1);
  45
  46                 ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
  47                 if (ret) {
  48                         dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
  49                                 "HDMI_DDC_DATA", config->ddc_data_gpio, ret);
  50                         goto error2;
  51                 }
  52                 gpio_set_value_cansleep(config->ddc_data_gpio, 1);
  53
  54                 ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
  55                 if (ret) {
  56                         dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
  57                                 "HDMI_HPD", config->hpd_gpio, ret);
  58                         goto error3;
  59                 }
  60                 gpio_direction_input(config->hpd_gpio);
  61                 gpio_set_value_cansleep(config->hpd_gpio, 1);
  62
  63                 if (config->mux_en_gpio != -1) {
  64                         ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
  65                         if (ret) {
  66                                 dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
  67                                         "HDMI_MUX_EN", config->mux_en_gpio, ret);
  68                                 goto error4;
  69                         }
  70                         gpio_set_value_cansleep(config->mux_en_gpio, 1);
  71                 }
  72
  73                 if (config->mux_sel_gpio != -1) {
  74                         ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
  75                         if (ret) {
  76                                 dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
  77                                         "HDMI_MUX_SEL", config->mux_sel_gpio, ret);
  78                                 goto error5;
  79                         }
  80                         gpio_set_value_cansleep(config->mux_sel_gpio, 0);
  81                 }
  82
  83                 if (config->mux_lpm_gpio != -1) {
  84                         ret = gpio_request(config->mux_lpm_gpio,
  85                                         "HDMI_MUX_LPM");
  86                         if (ret) {
  87                                 dev_err(dev,
  88                                         "'%s'(%d) gpio_request failed: %d\n",
  89                                         "HDMI_MUX_LPM",
  90                                         config->mux_lpm_gpio, ret);
  91                                 goto error6;
  92                         }
  93                         gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
  94                 }
  95                 DBG("gpio on");
  96         } else {
  97                 gpio_free(config->ddc_clk_gpio);
  98                 gpio_free(config->ddc_data_gpio);
  99                 gpio_free(config->hpd_gpio);
 100
 101                 if (config->mux_en_gpio != -1) {
 102                         gpio_set_value_cansleep(config->mux_en_gpio, 0);
 103                         gpio_free(config->mux_en_gpio);
 104                 }
 105
 106                 if (config->mux_sel_gpio != -1) {
 107                         gpio_set_value_cansleep(config->mux_sel_gpio, 1);
 108                         gpio_free(config->mux_sel_gpio);
 109                 }
 110
 111                 if (config->mux_lpm_gpio != -1) {
 112                         gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
 113                         gpio_free(config->mux_lpm_gpio);
 114                 }
 115                 DBG("gpio off");
 116         }
 117
 118         return 0;
 119
 120 error6:
 121         if (config->mux_sel_gpio != -1)
 122                 gpio_free(config->mux_sel_gpio);
 123 error5:
 124         if (config->mux_en_gpio != -1)
 125                 gpio_free(config->mux_en_gpio);
 126 error4:
 127         gpio_free(config->hpd_gpio);
 128 error3:
 129         gpio_free(config->ddc_data_gpio);
 130 error2:
 131         gpio_free(config->ddc_clk_gpio);
 132 error1:
 133         return ret;
 134 }
 135
 136 static int hpd_enable(struct hdmi_connector *hdmi_connector)
 137 {
 138         struct hdmi *hdmi = hdmi_connector->hdmi;
 139         const struct hdmi_platform_config *config = hdmi->config;
 140         struct device *dev = &hdmi->pdev->dev;
 141         struct hdmi_phy *phy = hdmi->phy;
 142         uint32_t hpd_ctrl;
 143         int i, ret;
 144
 145         for (i = 0; i < config->hpd_reg_cnt; i++) {
 146                 ret = regulator_enable(hdmi->hpd_regs[i]);
 147                 if (ret) {
 148                         dev_err(dev, "failed to enable hpd regulator: %s (%d)\n",
 149                                         config->hpd_reg_names[i], ret);
 150                         goto fail;
 151                 }
 152         }
 153
 154         ret = pinctrl_pm_select_default_state(dev);
 155         if (ret) {
 156                 dev_err(dev, "pinctrl state chg failed: %d\n", ret);
 157                 goto fail;
 158         }
 159
 160         ret = gpio_config(hdmi, true);
 161         if (ret) {
 162                 dev_err(dev, "failed to configure GPIOs: %d\n", ret);
 163                 goto fail;
 164         }
 165
 166         for (i = 0; i < config->hpd_clk_cnt; i++) {
 167                 if (config->hpd_freq && config->hpd_freq[i]) {
 168                         ret = clk_set_rate(hdmi->hpd_clks[i],
 169                                         config->hpd_freq[i]);
 170                         if (ret)
 171                                 dev_warn(dev, "failed to set clk %s (%d)\n",
 172                                                 config->hpd_clk_names[i], ret);
 173                 }
 174
 175                 ret = clk_prepare_enable(hdmi->hpd_clks[i]);
 176                 if (ret) {
 177                         dev_err(dev, "failed to enable hpd clk: %s (%d)\n",
 178                                         config->hpd_clk_names[i], ret);
 179                         goto fail;
 180                 }
 181         }
 182
 183         hdmi_set_mode(hdmi, false);
 184         phy->funcs->reset(phy);
 185         hdmi_set_mode(hdmi, true);
 186
 187         hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
 188
 189         /* enable HPD events: */
 190         hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
 191                         HDMI_HPD_INT_CTRL_INT_CONNECT |
 192                         HDMI_HPD_INT_CTRL_INT_EN);
 193
 194         /* set timeout to 4.1ms (max) for hardware debounce */
 195         hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
 196         hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
 197
 198         /* Toggle HPD circuit to trigger HPD sense */
 199         hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
 200                         ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
 201         hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
 202                         HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
 203
 204         return 0;
 205
 206 fail:
 207         return ret;
 208 }
 209
 210 static void hdp_disable(struct hdmi_connector *hdmi_connector)
 211 {
 212         struct hdmi *hdmi = hdmi_connector->hdmi;
 213         const struct hdmi_platform_config *config = hdmi->config;
 214         struct device *dev = &hdmi->pdev->dev;
 215         int i, ret = 0;
 216
 217         /* Disable HPD interrupt */
 218         hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
 219
 220         hdmi_set_mode(hdmi, false);
 221
 222         for (i = 0; i < config->hpd_clk_cnt; i++)
 223                 clk_disable_unprepare(hdmi->hpd_clks[i]);
 224
 225         ret = gpio_config(hdmi, false);
 226         if (ret)
 227                 dev_warn(dev, "failed to unconfigure GPIOs: %d\n", ret);
 228
 229         ret = pinctrl_pm_select_sleep_state(dev);
 230         if (ret)
 231                 dev_warn(dev, "pinctrl state chg failed: %d\n", ret);
 232
 233         for (i = 0; i < config->hpd_reg_cnt; i++) {
 234                 ret = regulator_disable(hdmi->hpd_regs[i]);
 235                 if (ret)
 236                         dev_warn(dev, "failed to disable hpd regulator: %s (%d)\n",
 237                                         config->hpd_reg_names[i], ret);
 238         }
 239 }
 240
 241 static void
 242 hotplug_work(struct work_struct *work)
 243 {
 244         struct hdmi_connector *hdmi_connector =
 245                 container_of(work, struct hdmi_connector, hpd_work);
 246         struct drm_connector *connector = &hdmi_connector->base;
 247         drm_helper_hpd_irq_event(connector->dev);
 248 }
 249
 250 void hdmi_connector_irq(struct drm_connector *connector)
 251 {
 252         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 253         struct msm_drm_private *priv = connector->dev->dev_private;
 254         struct hdmi *hdmi = hdmi_connector->hdmi;
 255         uint32_t hpd_int_status, hpd_int_ctrl;
 256
 257         /* Process HPD: */
 258         hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
 259         hpd_int_ctrl   = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
 260
 261         if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
 262                         (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
 263                 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
 264
 265                 /* ack & disable (temporarily) HPD events: */
 266                 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
 267                         HDMI_HPD_INT_CTRL_INT_ACK);
 268
 269                 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
 270
 271                 /* detect disconnect if we are connected or visa versa: */
 272                 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
 273                 if (!detected)
 274                         hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
 275                 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
 276
 277                 queue_work(priv->wq, &hdmi_connector->hpd_work);
 278         }
 279 }
 280
 281 static enum drm_connector_status detect_reg(struct hdmi *hdmi)
 282 {
 283         uint32_t hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
 284         return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
 285                         connector_status_connected : connector_status_disconnected;
 286 }
 287
 288 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
 289 {
 290         const struct hdmi_platform_config *config = hdmi->config;
 291         return gpio_get_value(config->hpd_gpio) ?
 292                         connector_status_connected :
 293                         connector_status_disconnected;
 294 }
 295
 296 static enum drm_connector_status hdmi_connector_detect(
 297                 struct drm_connector *connector, bool force)
 298 {
 299         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 300         struct hdmi *hdmi = hdmi_connector->hdmi;
 301         enum drm_connector_status stat_gpio, stat_reg;
 302         int retry = 20;
 303
 304         do {
 305                 stat_gpio = detect_gpio(hdmi);
 306                 stat_reg  = detect_reg(hdmi);
 307
 308                 if (stat_gpio == stat_reg)
 309                         break;
 310
 311                 mdelay(10);
 312         } while (--retry);
 313
 314         /* the status we get from reading gpio seems to be more reliable,
 315          * so trust that one the most if we didn't manage to get hdmi and
 316          * gpio status to agree:
 317          */
 318         if (stat_gpio != stat_reg) {
 319                 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
 320                 DBG("hpd gpio tells us: %d", stat_gpio);
 321         }
 322
 323         return stat_gpio;
 324 }
 325
 326 static void hdmi_connector_destroy(struct drm_connector *connector)
 327 {
 328         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 329
 330         hdp_disable(hdmi_connector);
 331
 332         drm_connector_unregister(connector);
 333         drm_connector_cleanup(connector);
 334
 335         kfree(hdmi_connector);
 336 }
 337
 338 static int hdmi_connector_get_modes(struct drm_connector *connector)
 339 {
 340         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 341         struct hdmi *hdmi = hdmi_connector->hdmi;
 342         struct edid *edid;
 343         uint32_t hdmi_ctrl;
 344         int ret = 0;
 345
 346         hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
 347         hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
 348
 349         edid = drm_get_edid(connector, hdmi->i2c);
 350
 351         hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
 352
 353         drm_mode_connector_update_edid_property(connector, edid);
 354
 355         if (edid) {
 356                 ret = drm_add_edid_modes(connector, edid);
 357                 kfree(edid);
 358         }
 359
 360         return ret;
 361 }
 362
 363 static int hdmi_connector_mode_valid(struct drm_connector *connector,
 364                                  struct drm_display_mode *mode)
 365 {
 366         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 367         struct hdmi *hdmi = hdmi_connector->hdmi;
 368         const struct hdmi_platform_config *config = hdmi->config;
 369         struct msm_drm_private *priv = connector->dev->dev_private;
 370         struct msm_kms *kms = priv->kms;
 371         long actual, requested;
 372
 373         requested = 1000 * mode->clock;
 374         actual = kms->funcs->round_pixclk(kms,
 375                         requested, hdmi_connector->hdmi->encoder);
 376
 377         /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
 378          * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
 379          * instead):
 380          */
 381         if (config->pwr_clk_cnt > 0)
 382                 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
 383
 384         DBG("requested=%ld, actual=%ld", requested, actual);
 385
 386         if (actual != requested)
 387                 return MODE_CLOCK_RANGE;
 388
 389         return 0;
 390 }
 391
 392 static struct drm_encoder *
 393 hdmi_connector_best_encoder(struct drm_connector *connector)
 394 {
 395         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 396         return hdmi_connector->hdmi->encoder;
 397 }
 398
 399 static const struct drm_connector_funcs hdmi_connector_funcs = {
 400         .dpms = drm_atomic_helper_connector_dpms,
 401         .detect = hdmi_connector_detect,
 402         .fill_modes = drm_helper_probe_single_connector_modes,
 403         .destroy = hdmi_connector_destroy,
 404         .reset = drm_atomic_helper_connector_reset,
 405         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 406         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 407 };
 408
 409 static const struct drm_connector_helper_funcs hdmi_connector_helper_funcs = {
 410         .get_modes = hdmi_connector_get_modes,
 411         .mode_valid = hdmi_connector_mode_valid,
 412         .best_encoder = hdmi_connector_best_encoder,
 413 };
 414
 415 /* initialize connector */
 416 struct drm_connector *hdmi_connector_init(struct hdmi *hdmi)
 417 {
 418         struct drm_connector *connector = NULL;
 419         struct hdmi_connector *hdmi_connector;
 420         int ret;
 421
 422         hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
 423         if (!hdmi_connector) {
 424                 ret = -ENOMEM;
 425                 goto fail;
 426         }
 427
 428         hdmi_connector->hdmi = hdmi;
 429         INIT_WORK(&hdmi_connector->hpd_work, hotplug_work);
 430
 431         connector = &hdmi_connector->base;
 432
 433         drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
 434                         DRM_MODE_CONNECTOR_HDMIA);
 435         drm_connector_helper_add(connector, &hdmi_connector_helper_funcs);
 436
 437         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 438                         DRM_CONNECTOR_POLL_DISCONNECT;
 439
 440         connector->interlace_allowed = 0;
 441         connector->doublescan_allowed = 0;
 442
 443         drm_connector_register(connector);
 444
 445         ret = hpd_enable(hdmi_connector);
 446         if (ret) {
 447                 dev_err(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
 448                 goto fail;
 449         }
 450
 451         drm_mode_connector_attach_encoder(connector, hdmi->encoder);
 452
 453         return connector;
 454
 455 fail:
 456         if (connector)
 457                 hdmi_connector_destroy(connector);
 458
 459         return ERR_PTR(ret);
 460 }