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 void adv7511_dsi_config_timing_gen(struct adv7511 *adv)
  36 {
  37         struct mipi_dsi_device *dsi = adv->dsi;
  38         struct drm_display_mode *mode = &adv->curr_mode;
  39         unsigned int hsw, hfp, hbp, vsw, vfp, vbp;
  40         u8 clock_div_by_lanes[] = { 6, 4, 3 };  /* 2, 3, 4 lanes */
  41
  42         hsw = mode->hsync_end - mode->hsync_start;
  43         hfp = mode->hsync_start - mode->hdisplay;
  44         hbp = mode->htotal - mode->hsync_end;
  45         vsw = mode->vsync_end - mode->vsync_start;
  46         vfp = mode->vsync_start - mode->vdisplay;
  47         vbp = mode->vtotal - mode->vsync_end;
  48
  49         /* set pixel clock divider mode */
  50         regmap_write(adv->regmap_cec, 0x16,
  51                      clock_div_by_lanes[dsi->lanes - 2] << 3);
  52
  53         /* horizontal porch params */
  54         regmap_write(adv->regmap_cec, 0x28, mode->htotal >> 4);
  55         regmap_write(adv->regmap_cec, 0x29, (mode->htotal << 4) & 0xff);
  56         regmap_write(adv->regmap_cec, 0x2a, hsw >> 4);
  57         regmap_write(adv->regmap_cec, 0x2b, (hsw << 4) & 0xff);
  58         regmap_write(adv->regmap_cec, 0x2c, hfp >> 4);
  59         regmap_write(adv->regmap_cec, 0x2d, (hfp << 4) & 0xff);
  60         regmap_write(adv->regmap_cec, 0x2e, hbp >> 4);
  61         regmap_write(adv->regmap_cec, 0x2f, (hbp << 4) & 0xff);
  62
  63         /* vertical porch params */
  64         regmap_write(adv->regmap_cec, 0x30, mode->vtotal >> 4);
  65         regmap_write(adv->regmap_cec, 0x31, (mode->vtotal << 4) & 0xff);
  66         regmap_write(adv->regmap_cec, 0x32, vsw >> 4);
  67         regmap_write(adv->regmap_cec, 0x33, (vsw << 4) & 0xff);
  68         regmap_write(adv->regmap_cec, 0x34, vfp >> 4);
  69         regmap_write(adv->regmap_cec, 0x35, (vfp << 4) & 0xff);
  70         regmap_write(adv->regmap_cec, 0x36, vbp >> 4);
  71         regmap_write(adv->regmap_cec, 0x37, (vbp << 4) & 0xff);
  72 }
  73
  74 void adv7533_dsi_power_on(struct adv7511 *adv)
  75 {
  76         struct mipi_dsi_device *dsi = adv->dsi;
  77
  78         if (adv->use_timing_gen)
  79                 adv7511_dsi_config_timing_gen(adv);
  80
  81         /* set number of dsi lanes */
  82         regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
  83
  84         if (adv->use_timing_gen) {
  85                 /* reset internal timing generator */
  86                 regmap_write(adv->regmap_cec, 0x27, 0xcb);
  87                 regmap_write(adv->regmap_cec, 0x27, 0x8b);
  88                 regmap_write(adv->regmap_cec, 0x27, 0xcb);
  89         } else {
  90                 /* disable internal timing generator */
  91                 regmap_write(adv->regmap_cec, 0x27, 0x0b);
  92         }
  93
  94         /* enable hdmi */
  95         regmap_write(adv->regmap_cec, 0x03, 0x89);
  96         /* disable test mode */
  97         regmap_write(adv->regmap_cec, 0x55, 0x00);
  98
  99         regmap_register_patch(adv->regmap_cec, adv7533_cec_fixed_registers,
 100                               ARRAY_SIZE(adv7533_cec_fixed_registers));
 101 }
 102
 103 void adv7533_dsi_power_off(struct adv7511 *adv)
 104 {
 105         /* disable hdmi */
 106         regmap_write(adv->regmap_cec, 0x03, 0x0b);
 107         /* disable internal timing generator */
 108         regmap_write(adv->regmap_cec, 0x27, 0x0b);
 109 }
 110
 111 void adv7533_mode_set(struct adv7511 *adv, struct drm_display_mode *mode)
 112 {
 113         struct mipi_dsi_device *dsi = adv->dsi;
 114         int lanes, ret;
 115
 116         if (adv->num_dsi_lanes != 4)
 117                 return;
 118
 119         if (mode->clock > 80000)
 120                 lanes = 4;
 121         else
 122                 lanes = 3;
 123
 124         if (lanes != dsi->lanes) {
 125                 mipi_dsi_detach(dsi);
 126                 dsi->lanes = lanes;
 127                 ret = mipi_dsi_attach(dsi);
 128                 if (ret)
 129                         dev_err(&dsi->dev, "failed to change host lanes\n");
 130         }
 131 }
 132
 133 int adv7533_patch_registers(struct adv7511 *adv)
 134 {
 135         return regmap_register_patch(adv->regmap,
 136                                      adv7533_fixed_registers,
 137                                      ARRAY_SIZE(adv7533_fixed_registers));
 138 }
 139
 140 int adv7533_patch_cec_registers(struct adv7511 *adv)
 141 {
 142         return regmap_register_patch(adv->regmap_cec,
 143                                     adv7533_cec_fixed_registers,
 144                                     ARRAY_SIZE(adv7533_cec_fixed_registers));
 145 }
 146
 147 int adv7533_attach_dsi(struct adv7511 *adv)
 148 {
 149         struct device *dev = &adv->i2c_main->dev;
 150         struct mipi_dsi_host *host;
 151         struct mipi_dsi_device *dsi;
 152         int ret = 0;
 153         const struct mipi_dsi_device_info info = { .type = "adv7533",
 154                                                    .channel = 0,
 155                                                    .node = NULL,
 156                                                  };
 157
 158         host = of_find_mipi_dsi_host_by_node(adv->host_node);
 159         if (!host) {
 160                 dev_err(dev, "failed to find dsi host\n");
 161                 return -EPROBE_DEFER;
 162         }
 163
 164         dsi = mipi_dsi_device_register_full(host, &info);
 165         if (IS_ERR(dsi)) {
 166                 dev_err(dev, "failed to create dsi device\n");
 167                 ret = PTR_ERR(dsi);
 168                 goto err_dsi_device;
 169         }
 170
 171         adv->dsi = dsi;
 172
 173         dsi->lanes = adv->num_dsi_lanes;
 174         dsi->format = MIPI_DSI_FMT_RGB888;
 175         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 176                           MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
 177
 178         ret = mipi_dsi_attach(dsi);
 179         if (ret < 0) {
 180                 dev_err(dev, "failed to attach dsi to host\n");
 181                 goto err_dsi_attach;
 182         }
 183
 184         return 0;
 185
 186 err_dsi_attach:
 187         mipi_dsi_device_unregister(dsi);
 188 err_dsi_device:
 189         return ret;
 190 }
 191
 192 void adv7533_detach_dsi(struct adv7511 *adv)
 193 {
 194         mipi_dsi_detach(adv->dsi);
 195         mipi_dsi_device_unregister(adv->dsi);
 196 }
 197
 198 int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
 199 {
 200         u32 num_lanes;
 201
 202         of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
 203
 204         if (num_lanes < 1 || num_lanes > 4)
 205                 return -EINVAL;
 206
 207         adv->num_dsi_lanes = num_lanes;
 208
 209         adv->host_node = of_graph_get_remote_node(np, 0, 0);
 210         if (!adv->host_node)
 211                 return -ENODEV;
 212
 213         of_node_put(adv->host_node);
 214
 215         adv->use_timing_gen = !of_property_read_bool(np,
 216                                                 "adi,disable-timing-generator");
 217
 218         /* TODO: Check if these need to be parsed by DT or not */
 219         adv->rgb = true;
 220         adv->embedded_sync = false;
 221
 222         return 0;
 223 }