drivers/gpu/drm/bridge/adv7511/adv7533.c

   1 /*
   2  * Copyright (c) 2016, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/of_graph.h>
  15
  16 #include "adv7511.h"
  17
  18 static const struct reg_sequence adv7533_fixed_registers[] = {
  19         { 0x16, 0x20 },
  20         { 0x9a, 0xe0 },
  21         { 0xba, 0x70 },
  22         { 0xde, 0x82 },
  23         { 0xe4, 0x40 },
  24         { 0xe5, 0x80 },
  25 };
  26
  27 static const struct reg_sequence adv7533_cec_fixed_registers[] = {
  28         { 0x15, 0xd0 },
  29         { 0x17, 0xd0 },
  30         { 0x24, 0x20 },
  31         { 0x57, 0x11 },
  32 };
  33
  34 static const struct regmap_config adv7533_cec_regmap_config = {
  35         .reg_bits = 8,
  36         .val_bits = 8,
  37
  38         .max_register = 0xff,
  39         .cache_type = REGCACHE_RBTREE,
  40 };
  41
  42 static void adv7511_dsi_config_timing_gen(struct adv7511 *adv)
  43 {
  44         struct mipi_dsi_device *dsi = adv->dsi;
  45         struct drm_display_mode *mode = &adv->curr_mode;
  46         unsigned int hsw, hfp, hbp, vsw, vfp, vbp;
  47         u8 clock_div_by_lanes[] = { 6, 4, 3 };  /* 2, 3, 4 lanes */
  48
  49         hsw = mode->hsync_end - mode->hsync_start;
  50         hfp = mode->hsync_start - mode->hdisplay;
  51         hbp = mode->htotal - mode->hsync_end;
  52         vsw = mode->vsync_end - mode->vsync_start;
  53         vfp = mode->vsync_start - mode->vdisplay;
  54         vbp = mode->vtotal - mode->vsync_end;
  55
  56         /* set pixel clock divider mode */
  57         regmap_write(adv->regmap_cec, 0x16,
  58                      clock_div_by_lanes[dsi->lanes - 2] << 3);
  59
  60         /* horizontal porch params */
  61         regmap_write(adv->regmap_cec, 0x28, mode->htotal >> 4);
  62         regmap_write(adv->regmap_cec, 0x29, (mode->htotal << 4) & 0xff);
  63         regmap_write(adv->regmap_cec, 0x2a, hsw >> 4);
  64         regmap_write(adv->regmap_cec, 0x2b, (hsw << 4) & 0xff);
  65         regmap_write(adv->regmap_cec, 0x2c, hfp >> 4);
  66         regmap_write(adv->regmap_cec, 0x2d, (hfp << 4) & 0xff);
  67         regmap_write(adv->regmap_cec, 0x2e, hbp >> 4);
  68         regmap_write(adv->regmap_cec, 0x2f, (hbp << 4) & 0xff);
  69
  70         /* vertical porch params */
  71         regmap_write(adv->regmap_cec, 0x30, mode->vtotal >> 4);
  72         regmap_write(adv->regmap_cec, 0x31, (mode->vtotal << 4) & 0xff);
  73         regmap_write(adv->regmap_cec, 0x32, vsw >> 4);
  74         regmap_write(adv->regmap_cec, 0x33, (vsw << 4) & 0xff);
  75         regmap_write(adv->regmap_cec, 0x34, vfp >> 4);
  76         regmap_write(adv->regmap_cec, 0x35, (vfp << 4) & 0xff);
  77         regmap_write(adv->regmap_cec, 0x36, vbp >> 4);
  78         regmap_write(adv->regmap_cec, 0x37, (vbp << 4) & 0xff);
  79 }
  80
  81 void adv7533_dsi_power_on(struct adv7511 *adv)
  82 {
  83         struct mipi_dsi_device *dsi = adv->dsi;
  84
  85         if (adv->use_timing_gen)
  86                 adv7511_dsi_config_timing_gen(adv);
  87
  88         /* set number of dsi lanes */
  89         regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
  90
  91         if (adv->use_timing_gen) {
  92                 /* reset internal timing generator */
  93                 regmap_write(adv->regmap_cec, 0x27, 0xcb);
  94                 regmap_write(adv->regmap_cec, 0x27, 0x8b);
  95                 regmap_write(adv->regmap_cec, 0x27, 0xcb);
  96         } else {
  97                 /* disable internal timing generator */
  98                 regmap_write(adv->regmap_cec, 0x27, 0x0b);
  99         }
 100
 101         /* enable hdmi */
 102         regmap_write(adv->regmap_cec, 0x03, 0x89);
 103         /* disable test mode */
 104         regmap_write(adv->regmap_cec, 0x55, 0x00);
 105
 106         regmap_register_patch(adv->regmap_cec, adv7533_cec_fixed_registers,
 107                               ARRAY_SIZE(adv7533_cec_fixed_registers));
 108 }
 109
 110 void adv7533_dsi_power_off(struct adv7511 *adv)
 111 {
 112         /* disable hdmi */
 113         regmap_write(adv->regmap_cec, 0x03, 0x0b);
 114         /* disable internal timing generator */
 115         regmap_write(adv->regmap_cec, 0x27, 0x0b);
 116 }
 117
 118 void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode)
 119 {
 120         struct mipi_dsi_device *dsi = adv->dsi;
 121         int lanes, ret;
 122
 123         if (adv->num_dsi_lanes != 4)
 124                 return;
 125
 126         if (mode->clock > 80000)
 127                 lanes = 4;
 128         else
 129                 lanes = 3;
 130
 131         if (lanes != dsi->lanes) {
 132                 mipi_dsi_detach(dsi);
 133                 dsi->lanes = lanes;
 134                 ret = mipi_dsi_attach(dsi);
 135                 if (ret)
 136                         dev_err(&dsi->dev, "failed to change host lanes\n");
 137         }
 138 }
 139
 140 int adv7533_patch_registers(struct adv7511 *adv)
 141 {
 142         return regmap_register_patch(adv->regmap,
 143                                      adv7533_fixed_registers,
 144                                      ARRAY_SIZE(adv7533_fixed_registers));
 145 }
 146
 147 void adv7533_uninit_cec(struct adv7511 *adv)
 148 {
 149         i2c_unregister_device(adv->i2c_cec);
 150 }
 151
 152 static const int cec_i2c_addr = 0x78;
 153
 154 int adv7533_init_cec(struct adv7511 *adv)
 155 {
 156         int ret;
 157
 158         adv->i2c_cec = i2c_new_dummy(adv->i2c_main->adapter, cec_i2c_addr >> 1);
 159         if (!adv->i2c_cec)
 160                 return -ENOMEM;
 161
 162         adv->regmap_cec = devm_regmap_init_i2c(adv->i2c_cec,
 163                                         &adv7533_cec_regmap_config);
 164         if (IS_ERR(adv->regmap_cec)) {
 165                 ret = PTR_ERR(adv->regmap_cec);
 166                 goto err;
 167         }
 168
 169         ret = regmap_register_patch(adv->regmap_cec,
 170                                     adv7533_cec_fixed_registers,
 171                                     ARRAY_SIZE(adv7533_cec_fixed_registers));
 172         if (ret)
 173                 goto err;
 174
 175         return 0;
 176 err:
 177         adv7533_uninit_cec(adv);
 178         return ret;
 179 }
 180
 181 int adv7533_attach_dsi(struct adv7511 *adv)
 182 {
 183         struct device *dev = &adv->i2c_main->dev;
 184         struct mipi_dsi_host *host;
 185         struct mipi_dsi_device *dsi;
 186         int ret = 0;
 187         const struct mipi_dsi_device_info info = { .type = "adv7533",
 188                                                    .channel = 0,
 189                                                    .node = NULL,
 190                                                  };
 191
 192         host = of_find_mipi_dsi_host_by_node(adv->host_node);
 193         if (!host) {
 194                 dev_err(dev, "failed to find dsi host\n");
 195                 return -EPROBE_DEFER;
 196         }
 197
 198         dsi = mipi_dsi_device_register_full(host, &info);
 199         if (IS_ERR(dsi)) {
 200                 dev_err(dev, "failed to create dsi device\n");
 201                 ret = PTR_ERR(dsi);
 202                 goto err_dsi_device;
 203         }
 204
 205         adv->dsi = dsi;
 206
 207         dsi->lanes = adv->num_dsi_lanes;
 208         dsi->format = MIPI_DSI_FMT_RGB888;
 209         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 210                           MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
 211
 212         ret = mipi_dsi_attach(dsi);
 213         if (ret < 0) {
 214                 dev_err(dev, "failed to attach dsi to host\n");
 215                 goto err_dsi_attach;
 216         }
 217
 218         return 0;
 219
 220 err_dsi_attach:
 221         mipi_dsi_device_unregister(dsi);
 222 err_dsi_device:
 223         return ret;
 224 }
 225
 226 void adv7533_detach_dsi(struct adv7511 *adv)
 227 {
 228         mipi_dsi_detach(adv->dsi);
 229         mipi_dsi_device_unregister(adv->dsi);
 230 }
 231
 232 int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
 233 {
 234         u32 num_lanes;
 235         struct device_node *endpoint;
 236
 237         of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
 238
 239         if (num_lanes < 1 || num_lanes > 4)
 240                 return -EINVAL;
 241
 242         adv->num_dsi_lanes = num_lanes;
 243
 244         endpoint = of_graph_get_next_endpoint(np, NULL);
 245         if (!endpoint)
 246                 return -ENODEV;
 247
 248         adv->host_node = of_graph_get_remote_port_parent(endpoint);
 249         if (!adv->host_node) {
 250                 of_node_put(endpoint);
 251                 return -ENODEV;
 252         }
 253
 254         of_node_put(endpoint);
 255         of_node_put(adv->host_node);
 256
 257         adv->use_timing_gen = !of_property_read_bool(np,
 258                                                 "adi,disable-timing-generator");
 259
 260         /* TODO: Check if these need to be parsed by DT or not */
 261         adv->rgb = true;
 262         adv->embedded_sync = false;
 263
 264         return 0;
 265 }