drivers/gpu/drm/bridge/parade-ps8640.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2016 MediaTek Inc.
   4  */
   5
   6 #include <linux/delay.h>
   7 #include <linux/err.h>
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/i2c.h>
  10 #include <linux/module.h>
  11 #include <linux/of_graph.h>
  12 #include <linux/regulator/consumer.h>
  13
  14 #include <drm/drm_bridge.h>
  15 #include <drm/drm_mipi_dsi.h>
  16 #include <drm/drm_of.h>
  17 #include <drm/drm_panel.h>
  18 #include <drm/drm_print.h>
  19
  20 #define PAGE2_GPIO_H            0xa7
  21 #define PS_GPIO9                BIT(1)
  22 #define PAGE2_I2C_BYPASS        0xea
  23 #define I2C_BYPASS_EN           0xd0
  24 #define PAGE2_MCS_EN            0xf3
  25 #define MCS_EN                  BIT(0)
  26 #define PAGE3_SET_ADD           0xfe
  27 #define VDO_CTL_ADD             0x13
  28 #define VDO_DIS                 0x18
  29 #define VDO_EN                  0x1c
  30 #define DP_NUM_LANES            4
  31
  32 /*
  33  * PS8640 uses multiple addresses:
  34  * page[0]: for DP control
  35  * page[1]: for VIDEO Bridge
  36  * page[2]: for control top
  37  * page[3]: for DSI Link Control1
  38  * page[4]: for MIPI Phy
  39  * page[5]: for VPLL
  40  * page[6]: for DSI Link Control2
  41  * page[7]: for SPI ROM mapping
  42  */
  43 enum page_addr_offset {
  44         PAGE0_DP_CNTL = 0,
  45         PAGE1_VDO_BDG,
  46         PAGE2_TOP_CNTL,
  47         PAGE3_DSI_CNTL1,
  48         PAGE4_MIPI_PHY,
  49         PAGE5_VPLL,
  50         PAGE6_DSI_CNTL2,
  51         PAGE7_SPI_CNTL,
  52         MAX_DEVS
  53 };
  54
  55 enum ps8640_vdo_control {
  56         DISABLE = VDO_DIS,
  57         ENABLE = VDO_EN,
  58 };
  59
  60 struct ps8640 {
  61         struct drm_bridge bridge;
  62         struct drm_bridge *panel_bridge;
  63         struct mipi_dsi_device *dsi;
  64         struct i2c_client *page[MAX_DEVS];
  65         struct regulator_bulk_data supplies[2];
  66         struct gpio_desc *gpio_reset;
  67         struct gpio_desc *gpio_powerdown;
  68         bool powered;
  69 };
  70
  71 static inline struct ps8640 *bridge_to_ps8640(struct drm_bridge *e)
  72 {
  73         return container_of(e, struct ps8640, bridge);
  74 }
  75
  76 static int ps8640_bridge_vdo_control(struct ps8640 *ps_bridge,
  77                                      const enum ps8640_vdo_control ctrl)
  78 {
  79         struct i2c_client *client = ps_bridge->page[PAGE3_DSI_CNTL1];
  80         u8 vdo_ctrl_buf[] = { VDO_CTL_ADD, ctrl };
  81         int ret;
  82
  83         ret = i2c_smbus_write_i2c_block_data(client, PAGE3_SET_ADD,
  84                                              sizeof(vdo_ctrl_buf),
  85                                              vdo_ctrl_buf);
  86         if (ret < 0) {
  87                 DRM_ERROR("failed to %sable VDO: %d\n",
  88                           ctrl == ENABLE ? "en" : "dis", ret);
  89                 return ret;
  90         }
  91
  92         return 0;
  93 }
  94
  95 static void ps8640_bridge_poweron(struct ps8640 *ps_bridge)
  96 {
  97         struct i2c_client *client = ps_bridge->page[PAGE2_TOP_CNTL];
  98         unsigned long timeout;
  99         int ret, status;
 100
 101         if (ps_bridge->powered)
 102                 return;
 103
 104         ret = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
 105                                     ps_bridge->supplies);
 106         if (ret < 0) {
 107                 DRM_ERROR("cannot enable regulators %d\n", ret);
 108                 return;
 109         }
 110
 111         gpiod_set_value(ps_bridge->gpio_powerdown, 0);
 112         gpiod_set_value(ps_bridge->gpio_reset, 1);
 113         usleep_range(2000, 2500);
 114         gpiod_set_value(ps_bridge->gpio_reset, 0);
 115
 116         /*
 117          * Wait for the ps8640 embedded MCU to be ready
 118          * First wait 200ms and then check the MCU ready flag every 20ms
 119          */
 120         msleep(200);
 121
 122         timeout = jiffies + msecs_to_jiffies(200) + 1;
 123
 124         while (time_is_after_jiffies(timeout)) {
 125                 status = i2c_smbus_read_byte_data(client, PAGE2_GPIO_H);
 126                 if (status < 0) {
 127                         DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", status);
 128                         goto err_regulators_disable;
 129                 }
 130                 if ((status & PS_GPIO9) == PS_GPIO9)
 131                         break;
 132
 133                 msleep(20);
 134         }
 135
 136         msleep(50);
 137
 138         /*
 139          * The Manufacturer Command Set (MCS) is a device dependent interface
 140          * intended for factory programming of the display module default
 141          * parameters. Once the display module is configured, the MCS shall be
 142          * disabled by the manufacturer. Once disabled, all MCS commands are
 143          * ignored by the display interface.
 144          */
 145         status = i2c_smbus_read_byte_data(client, PAGE2_MCS_EN);
 146         if (status < 0) {
 147                 DRM_ERROR("failed read PAGE2_MCS_EN: %d\n", status);
 148                 goto err_regulators_disable;
 149         }
 150
 151         ret = i2c_smbus_write_byte_data(client, PAGE2_MCS_EN,
 152                                         status & ~MCS_EN);
 153         if (ret < 0) {
 154                 DRM_ERROR("failed write PAGE2_MCS_EN: %d\n", ret);
 155                 goto err_regulators_disable;
 156         }
 157
 158         /* Switch access edp panel's edid through i2c */
 159         ret = i2c_smbus_write_byte_data(client, PAGE2_I2C_BYPASS,
 160                                         I2C_BYPASS_EN);
 161         if (ret < 0) {
 162                 DRM_ERROR("failed write PAGE2_I2C_BYPASS: %d\n", ret);
 163                 goto err_regulators_disable;
 164         }
 165
 166         ps_bridge->powered = true;
 167
 168         return;
 169
 170 err_regulators_disable:
 171         regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
 172                                ps_bridge->supplies);
 173 }
 174
 175 static void ps8640_bridge_poweroff(struct ps8640 *ps_bridge)
 176 {
 177         int ret;
 178
 179         if (!ps_bridge->powered)
 180                 return;
 181
 182         gpiod_set_value(ps_bridge->gpio_reset, 1);
 183         gpiod_set_value(ps_bridge->gpio_powerdown, 1);
 184         ret = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
 185                                      ps_bridge->supplies);
 186         if (ret < 0)
 187                 DRM_ERROR("cannot disable regulators %d\n", ret);
 188
 189         ps_bridge->powered = false;
 190 }
 191
 192 static void ps8640_pre_enable(struct drm_bridge *bridge)
 193 {
 194         struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
 195         int ret;
 196
 197         ps8640_bridge_poweron(ps_bridge);
 198
 199         ret = ps8640_bridge_vdo_control(ps_bridge, ENABLE);
 200         if (ret < 0)
 201                 ps8640_bridge_poweroff(ps_bridge);
 202 }
 203
 204 static void ps8640_post_disable(struct drm_bridge *bridge)
 205 {
 206         struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
 207
 208         ps8640_bridge_vdo_control(ps_bridge, DISABLE);
 209         ps8640_bridge_poweroff(ps_bridge);
 210 }
 211
 212 static int ps8640_bridge_attach(struct drm_bridge *bridge,
 213                                 enum drm_bridge_attach_flags flags)
 214 {
 215         struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
 216         struct device *dev = &ps_bridge->page[0]->dev;
 217         struct device_node *in_ep, *dsi_node;
 218         struct mipi_dsi_device *dsi;
 219         struct mipi_dsi_host *host;
 220         int ret;
 221         const struct mipi_dsi_device_info info = { .type = "ps8640",
 222                                                    .channel = 0,
 223                                                    .node = NULL,
 224                                                  };
 225
 226         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
 227                 return -EINVAL;
 228
 229         /* port@0 is ps8640 dsi input port */
 230         in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
 231         if (!in_ep)
 232                 return -ENODEV;
 233
 234         dsi_node = of_graph_get_remote_port_parent(in_ep);
 235         of_node_put(in_ep);
 236         if (!dsi_node)
 237                 return -ENODEV;
 238
 239         host = of_find_mipi_dsi_host_by_node(dsi_node);
 240         of_node_put(dsi_node);
 241         if (!host)
 242                 return -ENODEV;
 243
 244         dsi = mipi_dsi_device_register_full(host, &info);
 245         if (IS_ERR(dsi)) {
 246                 dev_err(dev, "failed to create dsi device\n");
 247                 ret = PTR_ERR(dsi);
 248                 return ret;
 249         }
 250
 251         ps_bridge->dsi = dsi;
 252
 253         dsi->host = host;
 254         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 255                           MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
 256         dsi->format = MIPI_DSI_FMT_RGB888;
 257         dsi->lanes = DP_NUM_LANES;
 258         ret = mipi_dsi_attach(dsi);
 259         if (ret)
 260                 goto err_dsi_attach;
 261
 262         /* Attach the panel-bridge to the dsi bridge */
 263         return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
 264                                  &ps_bridge->bridge, flags);
 265
 266 err_dsi_attach:
 267         mipi_dsi_device_unregister(dsi);
 268         return ret;
 269 }
 270
 271 static struct edid *ps8640_bridge_get_edid(struct drm_bridge *bridge,
 272                                            struct drm_connector *connector)
 273 {
 274         struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
 275         bool poweroff = !ps_bridge->powered;
 276         struct edid *edid;
 277
 278         /*
 279          * When we end calling get_edid() triggered by an ioctl, i.e
 280          *
 281          *   drm_mode_getconnector (ioctl)
 282          *     -> drm_helper_probe_single_connector_modes
 283          *        -> drm_bridge_connector_get_modes
 284          *           -> ps8640_bridge_get_edid
 285          *
 286          * We need to make sure that what we need is enabled before reading
 287          * EDID, for this chip, we need to do a full poweron, otherwise it will
 288          * fail.
 289          */
 290         drm_bridge_chain_pre_enable(bridge);
 291
 292         edid = drm_get_edid(connector,
 293                             ps_bridge->page[PAGE0_DP_CNTL]->adapter);
 294
 295         /*
 296          * If we call the get_edid() function without having enabled the chip
 297          * before, return the chip to its original power state.
 298          */
 299         if (poweroff)
 300                 drm_bridge_chain_post_disable(bridge);
 301
 302         return edid;
 303 }
 304
 305 static const struct drm_bridge_funcs ps8640_bridge_funcs = {
 306         .attach = ps8640_bridge_attach,
 307         .get_edid = ps8640_bridge_get_edid,
 308         .post_disable = ps8640_post_disable,
 309         .pre_enable = ps8640_pre_enable,
 310 };
 311
 312 static int ps8640_probe(struct i2c_client *client)
 313 {
 314         struct device *dev = &client->dev;
 315         struct device_node *np = dev->of_node;
 316         struct ps8640 *ps_bridge;
 317         struct drm_panel *panel;
 318         int ret;
 319         u32 i;
 320
 321         ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
 322         if (!ps_bridge)
 323                 return -ENOMEM;
 324
 325         /* port@1 is ps8640 output port */
 326         ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
 327         if (ret < 0)
 328                 return ret;
 329         if (!panel)
 330                 return -ENODEV;
 331
 332         ps_bridge->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
 333         if (IS_ERR(ps_bridge->panel_bridge))
 334                 return PTR_ERR(ps_bridge->panel_bridge);
 335
 336         ps_bridge->supplies[0].supply = "vdd33";
 337         ps_bridge->supplies[1].supply = "vdd12";
 338         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
 339                                       ps_bridge->supplies);
 340         if (ret)
 341                 return ret;
 342
 343         ps_bridge->gpio_powerdown = devm_gpiod_get(&client->dev, "powerdown",
 344                                                    GPIOD_OUT_HIGH);
 345         if (IS_ERR(ps_bridge->gpio_powerdown))
 346                 return PTR_ERR(ps_bridge->gpio_powerdown);
 347
 348         /*
 349          * Assert the reset to avoid the bridge being initialized prematurely
 350          */
 351         ps_bridge->gpio_reset = devm_gpiod_get(&client->dev, "reset",
 352                                                GPIOD_OUT_HIGH);
 353         if (IS_ERR(ps_bridge->gpio_reset))
 354                 return PTR_ERR(ps_bridge->gpio_reset);
 355
 356         ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
 357         ps_bridge->bridge.of_node = dev->of_node;
 358         ps_bridge->bridge.ops = DRM_BRIDGE_OP_EDID;
 359         ps_bridge->bridge.type = DRM_MODE_CONNECTOR_eDP;
 360
 361         ps_bridge->page[PAGE0_DP_CNTL] = client;
 362
 363         for (i = 1; i < ARRAY_SIZE(ps_bridge->page); i++) {
 364                 ps_bridge->page[i] = devm_i2c_new_dummy_device(&client->dev,
 365                                                              client->adapter,
 366                                                              client->addr + i);
 367                 if (IS_ERR(ps_bridge->page[i])) {
 368                         dev_err(dev, "failed i2c dummy device, address %02x\n",
 369                                 client->addr + i);
 370                         return PTR_ERR(ps_bridge->page[i]);
 371                 }
 372         }
 373
 374         i2c_set_clientdata(client, ps_bridge);
 375
 376         drm_bridge_add(&ps_bridge->bridge);
 377
 378         return 0;
 379 }
 380
 381 static int ps8640_remove(struct i2c_client *client)
 382 {
 383         struct ps8640 *ps_bridge = i2c_get_clientdata(client);
 384
 385         drm_bridge_remove(&ps_bridge->bridge);
 386
 387         return 0;
 388 }
 389
 390 static const struct of_device_id ps8640_match[] = {
 391         { .compatible = "parade,ps8640" },
 392         { }
 393 };
 394 MODULE_DEVICE_TABLE(of, ps8640_match);
 395
 396 static struct i2c_driver ps8640_driver = {
 397         .probe_new = ps8640_probe,
 398         .remove = ps8640_remove,
 399         .driver = {
 400                 .name = "ps8640",
 401                 .of_match_table = ps8640_match,
 402         },
 403 };
 404 module_i2c_driver(ps8640_driver);
 405
 406 MODULE_AUTHOR("Jitao Shi <jitao.shi@mediatek.com>");
 407 MODULE_AUTHOR("CK Hu <ck.hu@mediatek.com>");
 408 MODULE_AUTHOR("Enric Balletbo i Serra <enric.balletbo@collabora.com>");
 409 MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
 410 MODULE_LICENSE("GPL v2");