drivers/gpu/drm/bridge/chipone-icn6211.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2020 Amarula Solutions(India)
   4  * Author: Jagan Teki <jagan@amarulasolutions.com>
   5  */
   6
   7 #include <drm/drm_atomic_helper.h>
   8 #include <drm/drm_of.h>
   9 #include <drm/drm_print.h>
  10 #include <drm/drm_mipi_dsi.h>
  11
  12 #include <linux/delay.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/module.h>
  15 #include <linux/of_device.h>
  16 #include <linux/regulator/consumer.h>
  17
  18 #include <video/mipi_display.h>
  19
  20 #define HACTIVE_LI              0x20
  21 #define VACTIVE_LI              0x21
  22 #define VACTIVE_HACTIVE_HI      0x22
  23 #define HFP_LI                  0x23
  24 #define HSYNC_LI                0x24
  25 #define HBP_LI                  0x25
  26 #define HFP_HSW_HBP_HI          0x26
  27 #define VFP                     0x27
  28 #define VSYNC                   0x28
  29 #define VBP                     0x29
  30
  31 struct chipone {
  32         struct device *dev;
  33         struct drm_bridge bridge;
  34         struct drm_bridge *panel_bridge;
  35         struct gpio_desc *enable_gpio;
  36         struct regulator *vdd1;
  37         struct regulator *vdd2;
  38         struct regulator *vdd3;
  39 };
  40
  41 static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
  42 {
  43         return container_of(bridge, struct chipone, bridge);
  44 }
  45
  46 static struct drm_display_mode *bridge_to_mode(struct drm_bridge *bridge)
  47 {
  48         return &bridge->encoder->crtc->state->adjusted_mode;
  49 }
  50
  51 static inline int chipone_dsi_write(struct chipone *icn,  const void *seq,
  52                                     size_t len)
  53 {
  54         struct mipi_dsi_device *dsi = to_mipi_dsi_device(icn->dev);
  55
  56         return mipi_dsi_generic_write(dsi, seq, len);
  57 }
  58
  59 #define ICN6211_DSI(icn, seq...)                                \
  60         {                                                       \
  61                 const u8 d[] = { seq };                         \
  62                 chipone_dsi_write(icn, d, ARRAY_SIZE(d));       \
  63         }
  64
  65 static void chipone_atomic_enable(struct drm_bridge *bridge,
  66                                   struct drm_bridge_state *old_bridge_state)
  67 {
  68         struct chipone *icn = bridge_to_chipone(bridge);
  69         struct drm_display_mode *mode = bridge_to_mode(bridge);
  70
  71         ICN6211_DSI(icn, 0x7a, 0xc1);
  72
  73         ICN6211_DSI(icn, HACTIVE_LI, mode->hdisplay & 0xff);
  74
  75         ICN6211_DSI(icn, VACTIVE_LI, mode->vdisplay & 0xff);
  76
  77         /**
  78          * lsb nibble: 2nd nibble of hdisplay
  79          * msb nibble: 2nd nibble of vdisplay
  80          */
  81         ICN6211_DSI(icn, VACTIVE_HACTIVE_HI,
  82                     ((mode->hdisplay >> 8) & 0xf) |
  83                     (((mode->vdisplay >> 8) & 0xf) << 4));
  84
  85         ICN6211_DSI(icn, HFP_LI, mode->hsync_start - mode->hdisplay);
  86
  87         ICN6211_DSI(icn, HSYNC_LI, mode->hsync_end - mode->hsync_start);
  88
  89         ICN6211_DSI(icn, HBP_LI, mode->htotal - mode->hsync_end);
  90
  91         ICN6211_DSI(icn, HFP_HSW_HBP_HI, 0x00);
  92
  93         ICN6211_DSI(icn, VFP, mode->vsync_start - mode->vdisplay);
  94
  95         ICN6211_DSI(icn, VSYNC, mode->vsync_end - mode->vsync_start);
  96
  97         ICN6211_DSI(icn, VBP, mode->vtotal - mode->vsync_end);
  98
  99         /* dsi specific sequence */
 100         ICN6211_DSI(icn, MIPI_DCS_SET_TEAR_OFF, 0x80);
 101         ICN6211_DSI(icn, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
 102         ICN6211_DSI(icn, 0xb5, 0xa0);
 103         ICN6211_DSI(icn, 0x5c, 0xff);
 104         ICN6211_DSI(icn, MIPI_DCS_SET_COLUMN_ADDRESS, 0x01);
 105         ICN6211_DSI(icn, MIPI_DCS_GET_POWER_SAVE, 0x92);
 106         ICN6211_DSI(icn, 0x6b, 0x71);
 107         ICN6211_DSI(icn, 0x69, 0x2b);
 108         ICN6211_DSI(icn, MIPI_DCS_ENTER_SLEEP_MODE, 0x40);
 109         ICN6211_DSI(icn, MIPI_DCS_EXIT_SLEEP_MODE, 0x98);
 110
 111         /* icn6211 specific sequence */
 112         ICN6211_DSI(icn, 0xb6, 0x20);
 113         ICN6211_DSI(icn, 0x51, 0x20);
 114         ICN6211_DSI(icn, 0x09, 0x10);
 115
 116         usleep_range(10000, 11000);
 117 }
 118
 119 static void chipone_atomic_pre_enable(struct drm_bridge *bridge,
 120                                       struct drm_bridge_state *old_bridge_state)
 121 {
 122         struct chipone *icn = bridge_to_chipone(bridge);
 123         int ret;
 124
 125         if (icn->vdd1) {
 126                 ret = regulator_enable(icn->vdd1);
 127                 if (ret)
 128                         DRM_DEV_ERROR(icn->dev,
 129                                       "failed to enable VDD1 regulator: %d\n", ret);
 130         }
 131
 132         if (icn->vdd2) {
 133                 ret = regulator_enable(icn->vdd2);
 134                 if (ret)
 135                         DRM_DEV_ERROR(icn->dev,
 136                                       "failed to enable VDD2 regulator: %d\n", ret);
 137         }
 138
 139         if (icn->vdd3) {
 140                 ret = regulator_enable(icn->vdd3);
 141                 if (ret)
 142                         DRM_DEV_ERROR(icn->dev,
 143                                       "failed to enable VDD3 regulator: %d\n", ret);
 144         }
 145
 146         gpiod_set_value(icn->enable_gpio, 1);
 147
 148         usleep_range(10000, 11000);
 149 }
 150
 151 static void chipone_atomic_post_disable(struct drm_bridge *bridge,
 152                                         struct drm_bridge_state *old_bridge_state)
 153 {
 154         struct chipone *icn = bridge_to_chipone(bridge);
 155
 156         if (icn->vdd1)
 157                 regulator_disable(icn->vdd1);
 158
 159         if (icn->vdd2)
 160                 regulator_disable(icn->vdd2);
 161
 162         if (icn->vdd3)
 163                 regulator_disable(icn->vdd3);
 164
 165         gpiod_set_value(icn->enable_gpio, 0);
 166 }
 167
 168 static int chipone_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags)
 169 {
 170         struct chipone *icn = bridge_to_chipone(bridge);
 171
 172         return drm_bridge_attach(bridge->encoder, icn->panel_bridge, bridge, flags);
 173 }
 174
 175 static const struct drm_bridge_funcs chipone_bridge_funcs = {
 176         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 177         .atomic_destroy_state   = drm_atomic_helper_bridge_destroy_state,
 178         .atomic_reset           = drm_atomic_helper_bridge_reset,
 179         .atomic_pre_enable      = chipone_atomic_pre_enable,
 180         .atomic_enable          = chipone_atomic_enable,
 181         .atomic_post_disable    = chipone_atomic_post_disable,
 182         .attach                 = chipone_attach,
 183 };
 184
 185 static int chipone_parse_dt(struct chipone *icn)
 186 {
 187         struct device *dev = icn->dev;
 188         struct drm_panel *panel;
 189         int ret;
 190
 191         icn->vdd1 = devm_regulator_get_optional(dev, "vdd1");
 192         if (IS_ERR(icn->vdd1)) {
 193                 ret = PTR_ERR(icn->vdd1);
 194                 if (ret == -EPROBE_DEFER)
 195                         return -EPROBE_DEFER;
 196                 icn->vdd1 = NULL;
 197                 DRM_DEV_DEBUG(dev, "failed to get VDD1 regulator: %d\n", ret);
 198         }
 199
 200         icn->vdd2 = devm_regulator_get_optional(dev, "vdd2");
 201         if (IS_ERR(icn->vdd2)) {
 202                 ret = PTR_ERR(icn->vdd2);
 203                 if (ret == -EPROBE_DEFER)
 204                         return -EPROBE_DEFER;
 205                 icn->vdd2 = NULL;
 206                 DRM_DEV_DEBUG(dev, "failed to get VDD2 regulator: %d\n", ret);
 207         }
 208
 209         icn->vdd3 = devm_regulator_get_optional(dev, "vdd3");
 210         if (IS_ERR(icn->vdd3)) {
 211                 ret = PTR_ERR(icn->vdd3);
 212                 if (ret == -EPROBE_DEFER)
 213                         return -EPROBE_DEFER;
 214                 icn->vdd3 = NULL;
 215                 DRM_DEV_DEBUG(dev, "failed to get VDD3 regulator: %d\n", ret);
 216         }
 217
 218         icn->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
 219         if (IS_ERR(icn->enable_gpio)) {
 220                 DRM_DEV_ERROR(dev, "failed to get enable GPIO\n");
 221                 return PTR_ERR(icn->enable_gpio);
 222         }
 223
 224         ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
 225         if (ret)
 226                 return ret;
 227
 228         icn->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
 229         if (IS_ERR(icn->panel_bridge))
 230                 return PTR_ERR(icn->panel_bridge);
 231
 232         return 0;
 233 }
 234
 235 static int chipone_probe(struct mipi_dsi_device *dsi)
 236 {
 237         struct device *dev = &dsi->dev;
 238         struct chipone *icn;
 239         int ret;
 240
 241         icn = devm_kzalloc(dev, sizeof(struct chipone), GFP_KERNEL);
 242         if (!icn)
 243                 return -ENOMEM;
 244
 245         mipi_dsi_set_drvdata(dsi, icn);
 246         icn->dev = dev;
 247
 248         ret = chipone_parse_dt(icn);
 249         if (ret)
 250                 return ret;
 251
 252         icn->bridge.funcs = &chipone_bridge_funcs;
 253         icn->bridge.type = DRM_MODE_CONNECTOR_DPI;
 254         icn->bridge.of_node = dev->of_node;
 255
 256         drm_bridge_add(&icn->bridge);
 257
 258         dsi->lanes = 4;
 259         dsi->format = MIPI_DSI_FMT_RGB888;
 260         dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
 261
 262         ret = mipi_dsi_attach(dsi);
 263         if (ret < 0) {
 264                 drm_bridge_remove(&icn->bridge);
 265                 dev_err(dev, "failed to attach dsi\n");
 266         }
 267
 268         return ret;
 269 }
 270
 271 static int chipone_remove(struct mipi_dsi_device *dsi)
 272 {
 273         struct chipone *icn = mipi_dsi_get_drvdata(dsi);
 274
 275         mipi_dsi_detach(dsi);
 276         drm_bridge_remove(&icn->bridge);
 277
 278         return 0;
 279 }
 280
 281 static const struct of_device_id chipone_of_match[] = {
 282         { .compatible = "chipone,icn6211", },
 283         { /* sentinel */ }
 284 };
 285 MODULE_DEVICE_TABLE(of, chipone_of_match);
 286
 287 static struct mipi_dsi_driver chipone_driver = {
 288         .probe = chipone_probe,
 289         .remove = chipone_remove,
 290         .driver = {
 291                 .name = "chipone-icn6211",
 292                 .owner = THIS_MODULE,
 293                 .of_match_table = chipone_of_match,
 294         },
 295 };
 296 module_mipi_dsi_driver(chipone_driver);
 297
 298 MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
 299 MODULE_DESCRIPTION("Chipone ICN6211 MIPI-DSI to RGB Converter Bridge");
 300 MODULE_LICENSE("GPL");