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 void msm_hdmi_phy_reset(struct hdmi *hdmi)
  32 {
  33         unsigned int val;
  34
  35         val = hdmi_read(hdmi, REG_HDMI_PHY_CTRL);
  36
  37         if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
  38                 /* pull low */
  39                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  40                                 val & ~HDMI_PHY_CTRL_SW_RESET);
  41         } else {
  42                 /* pull high */
  43                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  44                                 val | HDMI_PHY_CTRL_SW_RESET);
  45         }
  46
  47         if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
  48                 /* pull low */
  49                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  50                                 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
  51         } else {
  52                 /* pull high */
  53                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  54                                 val | HDMI_PHY_CTRL_SW_RESET_PLL);
  55         }
  56
  57         msleep(100);
  58
  59         if (val & HDMI_PHY_CTRL_SW_RESET_LOW) {
  60                 /* pull high */
  61                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  62                                 val | HDMI_PHY_CTRL_SW_RESET);
  63         } else {
  64                 /* pull low */
  65                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  66                                 val & ~HDMI_PHY_CTRL_SW_RESET);
  67         }
  68
  69         if (val & HDMI_PHY_CTRL_SW_RESET_PLL_LOW) {
  70                 /* pull high */
  71                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  72                                 val | HDMI_PHY_CTRL_SW_RESET_PLL);
  73         } else {
  74                 /* pull low */
  75                 hdmi_write(hdmi, REG_HDMI_PHY_CTRL,
  76                                 val & ~HDMI_PHY_CTRL_SW_RESET_PLL);
  77         }
  78 }
  79
  80 static int gpio_config(struct hdmi *hdmi, bool on)
  81 {
  82         struct device *dev = &hdmi->pdev->dev;
  83         const struct hdmi_platform_config *config = hdmi->config;
  84         int ret, i;
  85
  86         if (on) {
  87                 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
  88                         struct hdmi_gpio_data gpio = config->gpios[i];
  89
  90                         if (gpio.num != -1) {
  91                                 ret = gpio_request(gpio.num, gpio.label);
  92                                 if (ret) {
  93                                         dev_err(dev,
  94                                                 "'%s'(%d) gpio_request failed: %d\n",
  95                                                 gpio.label, gpio.num, ret);
  96                                         goto err;
  97                                 }
  98
  99                                 if (gpio.output) {
 100                                         gpio_direction_output(gpio.num,
 101                                                               gpio.value);
 102                                 } else {
 103                                         gpio_direction_input(gpio.num);
 104                                         gpio_set_value_cansleep(gpio.num,
 105                                                                 gpio.value);
 106                                 }
 107                         }
 108                 }
 109
 110                 DBG("gpio on");
 111         } else {
 112                 for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 113                         struct hdmi_gpio_data gpio = config->gpios[i];
 114
 115                         if (gpio.num == -1)
 116                                 continue;
 117
 118                         if (gpio.output) {
 119                                 int value = gpio.value ? 0 : 1;
 120
 121                                 gpio_set_value_cansleep(gpio.num, value);
 122                         }
 123
 124                         gpio_free(gpio.num);
 125                 };
 126
 127                 DBG("gpio off");
 128         }
 129
 130         return 0;
 131 err:
 132         while (i--) {
 133                 if (config->gpios[i].num != -1)
 134                         gpio_free(config->gpios[i].num);
 135         }
 136
 137         return ret;
 138 }
 139
 140 static void enable_hpd_clocks(struct hdmi *hdmi, bool enable)
 141 {
 142         const struct hdmi_platform_config *config = hdmi->config;
 143         struct device *dev = &hdmi->pdev->dev;
 144         int i, ret;
 145
 146         if (enable) {
 147                 for (i = 0; i < config->hpd_clk_cnt; i++) {
 148                         if (config->hpd_freq && config->hpd_freq[i]) {
 149                                 ret = clk_set_rate(hdmi->hpd_clks[i],
 150                                                    config->hpd_freq[i]);
 151                                 if (ret)
 152                                         dev_warn(dev,
 153                                                  "failed to set clk %s (%d)\n",
 154                                                  config->hpd_clk_names[i], ret);
 155                         }
 156
 157                         ret = clk_prepare_enable(hdmi->hpd_clks[i]);
 158                         if (ret) {
 159                                 dev_err(dev,
 160                                         "failed to enable hpd clk: %s (%d)\n",
 161                                         config->hpd_clk_names[i], ret);
 162                         }
 163                 }
 164         } else {
 165                 for (i = config->hpd_clk_cnt - 1; i >= 0; i--)
 166                         clk_disable_unprepare(hdmi->hpd_clks[i]);
 167         }
 168 }
 169
 170 int msm_hdmi_hpd_enable(struct drm_connector *connector)
 171 {
 172         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 173         struct hdmi *hdmi = hdmi_connector->hdmi;
 174         const struct hdmi_platform_config *config = hdmi->config;
 175         struct device *dev = &hdmi->pdev->dev;
 176         uint32_t hpd_ctrl;
 177         int i, ret;
 178         unsigned long flags;
 179
 180         for (i = 0; i < config->hpd_reg_cnt; i++) {
 181                 ret = regulator_enable(hdmi->hpd_regs[i]);
 182                 if (ret) {
 183                         dev_err(dev, "failed to enable hpd regulator: %s (%d)\n",
 184                                         config->hpd_reg_names[i], ret);
 185                         goto fail;
 186                 }
 187         }
 188
 189         ret = pinctrl_pm_select_default_state(dev);
 190         if (ret) {
 191                 dev_err(dev, "pinctrl state chg failed: %d\n", ret);
 192                 goto fail;
 193         }
 194
 195         ret = gpio_config(hdmi, true);
 196         if (ret) {
 197                 dev_err(dev, "failed to configure GPIOs: %d\n", ret);
 198                 goto fail;
 199         }
 200
 201         pm_runtime_get_sync(dev);
 202         enable_hpd_clocks(hdmi, true);
 203
 204         msm_hdmi_set_mode(hdmi, false);
 205         msm_hdmi_phy_reset(hdmi);
 206         msm_hdmi_set_mode(hdmi, true);
 207
 208         hdmi_write(hdmi, REG_HDMI_USEC_REFTIMER, 0x0001001b);
 209
 210         /* enable HPD events: */
 211         hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
 212                         HDMI_HPD_INT_CTRL_INT_CONNECT |
 213                         HDMI_HPD_INT_CTRL_INT_EN);
 214
 215         /* set timeout to 4.1ms (max) for hardware debounce */
 216         spin_lock_irqsave(&hdmi->reg_lock, flags);
 217         hpd_ctrl = hdmi_read(hdmi, REG_HDMI_HPD_CTRL);
 218         hpd_ctrl |= HDMI_HPD_CTRL_TIMEOUT(0x1fff);
 219
 220         /* Toggle HPD circuit to trigger HPD sense */
 221         hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
 222                         ~HDMI_HPD_CTRL_ENABLE & hpd_ctrl);
 223         hdmi_write(hdmi, REG_HDMI_HPD_CTRL,
 224                         HDMI_HPD_CTRL_ENABLE | hpd_ctrl);
 225         spin_unlock_irqrestore(&hdmi->reg_lock, flags);
 226
 227         return 0;
 228
 229 fail:
 230         return ret;
 231 }
 232
 233 static void hdp_disable(struct hdmi_connector *hdmi_connector)
 234 {
 235         struct hdmi *hdmi = hdmi_connector->hdmi;
 236         const struct hdmi_platform_config *config = hdmi->config;
 237         struct device *dev = &hdmi->pdev->dev;
 238         int i, ret = 0;
 239
 240         /* Disable HPD interrupt */
 241         hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, 0);
 242
 243         msm_hdmi_set_mode(hdmi, false);
 244
 245         enable_hpd_clocks(hdmi, false);
 246         pm_runtime_put_autosuspend(dev);
 247
 248         ret = gpio_config(hdmi, false);
 249         if (ret)
 250                 dev_warn(dev, "failed to unconfigure GPIOs: %d\n", ret);
 251
 252         ret = pinctrl_pm_select_sleep_state(dev);
 253         if (ret)
 254                 dev_warn(dev, "pinctrl state chg failed: %d\n", ret);
 255
 256         for (i = 0; i < config->hpd_reg_cnt; i++) {
 257                 ret = regulator_disable(hdmi->hpd_regs[i]);
 258                 if (ret)
 259                         dev_warn(dev, "failed to disable hpd regulator: %s (%d)\n",
 260                                         config->hpd_reg_names[i], ret);
 261         }
 262 }
 263
 264 static void
 265 msm_hdmi_hotplug_work(struct work_struct *work)
 266 {
 267         struct hdmi_connector *hdmi_connector =
 268                 container_of(work, struct hdmi_connector, hpd_work);
 269         struct drm_connector *connector = &hdmi_connector->base;
 270         drm_helper_hpd_irq_event(connector->dev);
 271 }
 272
 273 void msm_hdmi_connector_irq(struct drm_connector *connector)
 274 {
 275         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 276         struct hdmi *hdmi = hdmi_connector->hdmi;
 277         uint32_t hpd_int_status, hpd_int_ctrl;
 278
 279         /* Process HPD: */
 280         hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
 281         hpd_int_ctrl   = hdmi_read(hdmi, REG_HDMI_HPD_INT_CTRL);
 282
 283         if ((hpd_int_ctrl & HDMI_HPD_INT_CTRL_INT_EN) &&
 284                         (hpd_int_status & HDMI_HPD_INT_STATUS_INT)) {
 285                 bool detected = !!(hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED);
 286
 287                 /* ack & disable (temporarily) HPD events: */
 288                 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL,
 289                         HDMI_HPD_INT_CTRL_INT_ACK);
 290
 291                 DBG("status=%04x, ctrl=%04x", hpd_int_status, hpd_int_ctrl);
 292
 293                 /* detect disconnect if we are connected or visa versa: */
 294                 hpd_int_ctrl = HDMI_HPD_INT_CTRL_INT_EN;
 295                 if (!detected)
 296                         hpd_int_ctrl |= HDMI_HPD_INT_CTRL_INT_CONNECT;
 297                 hdmi_write(hdmi, REG_HDMI_HPD_INT_CTRL, hpd_int_ctrl);
 298
 299                 queue_work(hdmi->workq, &hdmi_connector->hpd_work);
 300         }
 301 }
 302
 303 static enum drm_connector_status detect_reg(struct hdmi *hdmi)
 304 {
 305         uint32_t hpd_int_status;
 306
 307         pm_runtime_get_sync(&hdmi->pdev->dev);
 308         enable_hpd_clocks(hdmi, true);
 309
 310         hpd_int_status = hdmi_read(hdmi, REG_HDMI_HPD_INT_STATUS);
 311
 312         enable_hpd_clocks(hdmi, false);
 313         pm_runtime_put_autosuspend(&hdmi->pdev->dev);
 314
 315         return (hpd_int_status & HDMI_HPD_INT_STATUS_CABLE_DETECTED) ?
 316                         connector_status_connected : connector_status_disconnected;
 317 }
 318
 319 #define HPD_GPIO_INDEX  2
 320 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
 321 {
 322         const struct hdmi_platform_config *config = hdmi->config;
 323         struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
 324
 325         return gpio_get_value(hpd_gpio.num) ?
 326                         connector_status_connected :
 327                         connector_status_disconnected;
 328 }
 329
 330 static enum drm_connector_status hdmi_connector_detect(
 331                 struct drm_connector *connector, bool force)
 332 {
 333         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 334         struct hdmi *hdmi = hdmi_connector->hdmi;
 335         const struct hdmi_platform_config *config = hdmi->config;
 336         struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
 337         enum drm_connector_status stat_gpio, stat_reg;
 338         int retry = 20;
 339
 340         /*
 341          * some platforms may not have hpd gpio. Rely only on the status
 342          * provided by REG_HDMI_HPD_INT_STATUS in this case.
 343          */
 344         if (hpd_gpio.num == -1)
 345                 return detect_reg(hdmi);
 346
 347         do {
 348                 stat_gpio = detect_gpio(hdmi);
 349                 stat_reg  = detect_reg(hdmi);
 350
 351                 if (stat_gpio == stat_reg)
 352                         break;
 353
 354                 mdelay(10);
 355         } while (--retry);
 356
 357         /* the status we get from reading gpio seems to be more reliable,
 358          * so trust that one the most if we didn't manage to get hdmi and
 359          * gpio status to agree:
 360          */
 361         if (stat_gpio != stat_reg) {
 362                 DBG("HDMI_HPD_INT_STATUS tells us: %d", stat_reg);
 363                 DBG("hpd gpio tells us: %d", stat_gpio);
 364         }
 365
 366         return stat_gpio;
 367 }
 368
 369 static void hdmi_connector_destroy(struct drm_connector *connector)
 370 {
 371         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 372
 373         hdp_disable(hdmi_connector);
 374
 375         drm_connector_cleanup(connector);
 376
 377         kfree(hdmi_connector);
 378 }
 379
 380 static int msm_hdmi_connector_get_modes(struct drm_connector *connector)
 381 {
 382         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 383         struct hdmi *hdmi = hdmi_connector->hdmi;
 384         struct edid *edid;
 385         uint32_t hdmi_ctrl;
 386         int ret = 0;
 387
 388         hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
 389         hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
 390
 391         edid = drm_get_edid(connector, hdmi->i2c);
 392
 393         hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
 394
 395         hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
 396         drm_connector_update_edid_property(connector, edid);
 397
 398         if (edid) {
 399                 ret = drm_add_edid_modes(connector, edid);
 400                 kfree(edid);
 401         }
 402
 403         return ret;
 404 }
 405
 406 static int msm_hdmi_connector_mode_valid(struct drm_connector *connector,
 407                                  struct drm_display_mode *mode)
 408 {
 409         struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
 410         struct hdmi *hdmi = hdmi_connector->hdmi;
 411         const struct hdmi_platform_config *config = hdmi->config;
 412         struct msm_drm_private *priv = connector->dev->dev_private;
 413         struct msm_kms *kms = priv->kms;
 414         long actual, requested;
 415
 416         requested = 1000 * mode->clock;
 417         actual = kms->funcs->round_pixclk(kms,
 418                         requested, hdmi_connector->hdmi->encoder);
 419
 420         /* for mdp5/apq8074, we manage our own pixel clk (as opposed to
 421          * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
 422          * instead):
 423          */
 424         if (config->pwr_clk_cnt > 0)
 425                 actual = clk_round_rate(hdmi->pwr_clks[0], actual);
 426
 427         DBG("requested=%ld, actual=%ld", requested, actual);
 428
 429         if (actual != requested)
 430                 return MODE_CLOCK_RANGE;
 431
 432         return 0;
 433 }
 434
 435 static const struct drm_connector_funcs hdmi_connector_funcs = {
 436         .detect = hdmi_connector_detect,
 437         .fill_modes = drm_helper_probe_single_connector_modes,
 438         .destroy = hdmi_connector_destroy,
 439         .reset = drm_atomic_helper_connector_reset,
 440         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 441         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 442 };
 443
 444 static const struct drm_connector_helper_funcs msm_hdmi_connector_helper_funcs = {
 445         .get_modes = msm_hdmi_connector_get_modes,
 446         .mode_valid = msm_hdmi_connector_mode_valid,
 447 };
 448
 449 /* initialize connector */
 450 struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
 451 {
 452         struct drm_connector *connector = NULL;
 453         struct hdmi_connector *hdmi_connector;
 454
 455         hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
 456         if (!hdmi_connector)
 457                 return ERR_PTR(-ENOMEM);
 458
 459         hdmi_connector->hdmi = hdmi;
 460         INIT_WORK(&hdmi_connector->hpd_work, msm_hdmi_hotplug_work);
 461
 462         connector = &hdmi_connector->base;
 463
 464         drm_connector_init(hdmi->dev, connector, &hdmi_connector_funcs,
 465                         DRM_MODE_CONNECTOR_HDMIA);
 466         drm_connector_helper_add(connector, &msm_hdmi_connector_helper_funcs);
 467
 468         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 469                         DRM_CONNECTOR_POLL_DISCONNECT;
 470
 471         connector->interlace_allowed = 0;
 472         connector->doublescan_allowed = 0;
 473
 474         drm_connector_attach_encoder(connector, hdmi->encoder);
 475
 476         return connector;
 477 }