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         { 0x05, 0xc8 },
  33 };
  34
  35 static const struct regmap_config adv7533_cec_regmap_config = {
  36         .reg_bits = 8,
  37         .val_bits = 8,
  38
  39         .max_register = 0xff,
  40         .cache_type = REGCACHE_RBTREE,
  41 };
  42
  43 static void adv7511_dsi_config_timing_gen(struct adv7511 *adv)
  44 {
  45         struct mipi_dsi_device *dsi = adv->dsi;
  46         struct drm_display_mode *mode = &adv->curr_mode;
  47         unsigned int hsw, hfp, hbp, vsw, vfp, vbp;
  48         u8 clock_div_by_lanes[] = { 6, 4, 3 };  /* 2, 3, 4 lanes */
  49
  50         hsw = mode->hsync_end - mode->hsync_start;
  51         hfp = mode->hsync_start - mode->hdisplay;
  52         hbp = mode->htotal - mode->hsync_end;
  53         vsw = mode->vsync_end - mode->vsync_start;
  54         vfp = mode->vsync_start - mode->vdisplay;
  55         vbp = mode->vtotal - mode->vsync_end;
  56
  57         /* set pixel clock divider mode */
  58         regmap_write(adv->regmap_cec, 0x16,
  59                      clock_div_by_lanes[dsi->lanes - 2] << 3);
  60
  61         /* horizontal porch params */
  62         regmap_write(adv->regmap_cec, 0x28, mode->htotal >> 4);
  63         regmap_write(adv->regmap_cec, 0x29, (mode->htotal << 4) & 0xff);
  64         regmap_write(adv->regmap_cec, 0x2a, hsw >> 4);
  65         regmap_write(adv->regmap_cec, 0x2b, (hsw << 4) & 0xff);
  66         regmap_write(adv->regmap_cec, 0x2c, hfp >> 4);
  67         regmap_write(adv->regmap_cec, 0x2d, (hfp << 4) & 0xff);
  68         regmap_write(adv->regmap_cec, 0x2e, hbp >> 4);
  69         regmap_write(adv->regmap_cec, 0x2f, (hbp << 4) & 0xff);
  70
  71         /* vertical porch params */
  72         regmap_write(adv->regmap_cec, 0x30, mode->vtotal >> 4);
  73         regmap_write(adv->regmap_cec, 0x31, (mode->vtotal << 4) & 0xff);
  74         regmap_write(adv->regmap_cec, 0x32, vsw >> 4);
  75         regmap_write(adv->regmap_cec, 0x33, (vsw << 4) & 0xff);
  76         regmap_write(adv->regmap_cec, 0x34, vfp >> 4);
  77         regmap_write(adv->regmap_cec, 0x35, (vfp << 4) & 0xff);
  78         regmap_write(adv->regmap_cec, 0x36, vbp >> 4);
  79         regmap_write(adv->regmap_cec, 0x37, (vbp << 4) & 0xff);
  80 }
  81
  82 void adv7533_dsi_power_on(struct adv7511 *adv)
  83 {
  84         struct mipi_dsi_device *dsi = adv->dsi;
  85
  86         if (adv->use_timing_gen)
  87                 adv7511_dsi_config_timing_gen(adv);
  88
  89         /* set number of dsi lanes */
  90         regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
  91
  92         if (adv->use_timing_gen) {
  93                 /* reset internal timing generator */
  94                 regmap_write(adv->regmap_cec, 0x27, 0xcb);
  95                 regmap_write(adv->regmap_cec, 0x27, 0x8b);
  96                 regmap_write(adv->regmap_cec, 0x27, 0xcb);
  97         } else {
  98                 /* disable internal timing generator */
  99                 regmap_write(adv->regmap_cec, 0x27, 0x0b);
 100         }
 101
 102         /* enable hdmi */
 103         regmap_write(adv->regmap_cec, 0x03, 0x89);
 104         /* disable test mode */
 105         regmap_write(adv->regmap_cec, 0x55, 0x00);
 106
 107         regmap_register_patch(adv->regmap_cec, adv7533_cec_fixed_registers,
 108                               ARRAY_SIZE(adv7533_cec_fixed_registers));
 109 }
 110
 111 void adv7533_dsi_power_off(struct adv7511 *adv)
 112 {
 113         /* disable hdmi */
 114         regmap_write(adv->regmap_cec, 0x03, 0x0b);
 115         /* disable internal timing generator */
 116         regmap_write(adv->regmap_cec, 0x27, 0x0b);
 117 }
 118
 119 void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode)
 120 {
 121         struct mipi_dsi_device *dsi = adv->dsi;
 122         int lanes, ret;
 123
 124         if (adv->num_dsi_lanes != 4)
 125                 return;
 126
 127         if (mode->clock > 80000)
 128                 lanes = 4;
 129         else
 130                 lanes = 3;
 131
 132         if (lanes != dsi->lanes) {
 133                 mipi_dsi_detach(dsi);
 134                 dsi->lanes = lanes;
 135                 ret = mipi_dsi_attach(dsi);
 136                 if (ret)
 137                         dev_err(&dsi->dev, "failed to change host lanes\n");
 138         }
 139 }
 140
 141 int adv7533_patch_registers(struct adv7511 *adv)
 142 {
 143         return regmap_register_patch(adv->regmap,
 144                                      adv7533_fixed_registers,
 145                                      ARRAY_SIZE(adv7533_fixed_registers));
 146 }
 147
 148 void adv7533_uninit_cec(struct adv7511 *adv)
 149 {
 150         i2c_unregister_device(adv->i2c_cec);
 151 }
 152
 153 int adv7533_init_cec(struct adv7511 *adv)
 154 {
 155         int ret;
 156
 157         adv->i2c_cec = i2c_new_dummy(adv->i2c_main->adapter,
 158                                      adv->i2c_main->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
 236         of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
 237
 238         if (num_lanes < 1 || num_lanes > 4)
 239                 return -EINVAL;
 240
 241         adv->num_dsi_lanes = num_lanes;
 242
 243         adv->host_node = of_graph_get_remote_node(np, 0, 0);
 244         if (!adv->host_node)
 245                 return -ENODEV;
 246
 247         of_node_put(adv->host_node);
 248
 249         adv->use_timing_gen = !of_property_read_bool(np,
 250                                                 "adi,disable-timing-generator");
 251
 252         /* TODO: Check if these need to be parsed by DT or not */
 253         adv->rgb = true;
 254         adv->embedded_sync = false;
 255
 256         return 0;
 257 }