drivers/video/omap2/dss/dpi.c

   1 /*
   2  * linux/drivers/video/omap2/dss/dpi.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * Some code and ideas taken from drivers/video/omap/ driver
   8  * by Imre Deak.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #define DSS_SUBSYS_NAME "DPI"
  24
  25 #include <linux/kernel.h>
  26 #include <linux/delay.h>
  27 #include <linux/export.h>
  28 #include <linux/err.h>
  29 #include <linux/errno.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/regulator/consumer.h>
  32
  33 #include <video/omapdss.h>
  34 #include <plat/cpu.h>
  35
  36 #include "dss.h"
  37
  38 static struct {
  39         struct regulator *vdds_dsi_reg;
  40         struct platform_device *dsidev;
  41
  42         struct dss_lcd_mgr_config mgr_config;
  43 } dpi;
  44
  45 static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
  46 {
  47         int dsi_module;
  48
  49         dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;
  50
  51         return dsi_get_dsidev_from_id(dsi_module);
  52 }
  53
  54 static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
  55 {
  56         if (dssdev->clocks.dispc.dispc_fclk_src ==
  57                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  58                         dssdev->clocks.dispc.dispc_fclk_src ==
  59                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
  60                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  61                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  62                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  63                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
  64                 return true;
  65         else
  66                 return false;
  67 }
  68
  69 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
  70                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  71                 int *pck_div)
  72 {
  73         struct dsi_clock_info dsi_cinfo;
  74         struct dispc_clock_info dispc_cinfo;
  75         int r;
  76
  77         r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
  78                         &dispc_cinfo);
  79         if (r)
  80                 return r;
  81
  82         r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
  83         if (r)
  84                 return r;
  85
  86         dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
  87
  88         dpi.mgr_config.clock_info = dispc_cinfo;
  89
  90         *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
  91         *lck_div = dispc_cinfo.lck_div;
  92         *pck_div = dispc_cinfo.pck_div;
  93
  94         return 0;
  95 }
  96
  97 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
  98                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  99                 int *pck_div)
 100 {
 101         struct dss_clock_info dss_cinfo;
 102         struct dispc_clock_info dispc_cinfo;
 103         int r;
 104
 105         r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
 106         if (r)
 107                 return r;
 108
 109         r = dss_set_clock_div(&dss_cinfo);
 110         if (r)
 111                 return r;
 112
 113         dpi.mgr_config.clock_info = dispc_cinfo;
 114
 115         *fck = dss_cinfo.fck;
 116         *lck_div = dispc_cinfo.lck_div;
 117         *pck_div = dispc_cinfo.pck_div;
 118
 119         return 0;
 120 }
 121
 122 static int dpi_set_mode(struct omap_dss_device *dssdev)
 123 {
 124         struct omap_video_timings *t = &dssdev->panel.timings;
 125         int lck_div = 0, pck_div = 0;
 126         unsigned long fck = 0;
 127         unsigned long pck;
 128         int r = 0;
 129
 130         if (dpi_use_dsi_pll(dssdev))
 131                 r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
 132                                 &lck_div, &pck_div);
 133         else
 134                 r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
 135                                 &lck_div, &pck_div);
 136         if (r)
 137                 return r;
 138
 139         pck = fck / lck_div / pck_div / 1000;
 140
 141         if (pck != t->pixel_clock) {
 142                 DSSWARN("Could not find exact pixel clock. "
 143                                 "Requested %d kHz, got %lu kHz\n",
 144                                 t->pixel_clock, pck);
 145
 146                 t->pixel_clock = pck;
 147         }
 148
 149         dss_mgr_set_timings(dssdev->manager, t);
 150
 151         return 0;
 152 }
 153
 154 static void dpi_config_lcd_manager(struct omap_dss_device *dssdev)
 155 {
 156         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 157
 158         dpi.mgr_config.stallmode = false;
 159         dpi.mgr_config.fifohandcheck = false;
 160
 161         dpi.mgr_config.video_port_width = dssdev->phy.dpi.data_lines;
 162
 163         dpi.mgr_config.lcden_sig_polarity = 0;
 164
 165         dss_mgr_set_lcd_config(dssdev->manager, &dpi.mgr_config);
 166 }
 167
 168 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 169 {
 170         int r;
 171
 172         if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
 173                 DSSERR("no VDSS_DSI regulator\n");
 174                 return -ENODEV;
 175         }
 176
 177         if (dssdev->manager == NULL) {
 178                 DSSERR("failed to enable display: no manager\n");
 179                 return -ENODEV;
 180         }
 181
 182         r = omap_dss_start_device(dssdev);
 183         if (r) {
 184                 DSSERR("failed to start device\n");
 185                 goto err_start_dev;
 186         }
 187
 188         if (cpu_is_omap34xx()) {
 189                 r = regulator_enable(dpi.vdds_dsi_reg);
 190                 if (r)
 191                         goto err_reg_enable;
 192         }
 193
 194         r = dispc_runtime_get();
 195         if (r)
 196                 goto err_get_dispc;
 197
 198         if (dpi_use_dsi_pll(dssdev)) {
 199                 r = dsi_runtime_get(dpi.dsidev);
 200                 if (r)
 201                         goto err_get_dsi;
 202
 203                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 204                 if (r)
 205                         goto err_dsi_pll_init;
 206         }
 207
 208         r = dpi_set_mode(dssdev);
 209         if (r)
 210                 goto err_set_mode;
 211
 212         dpi_config_lcd_manager(dssdev);
 213
 214         mdelay(2);
 215
 216         r = dss_mgr_enable(dssdev->manager);
 217         if (r)
 218                 goto err_mgr_enable;
 219
 220         return 0;
 221
 222 err_mgr_enable:
 223 err_set_mode:
 224         if (dpi_use_dsi_pll(dssdev))
 225                 dsi_pll_uninit(dpi.dsidev, true);
 226 err_dsi_pll_init:
 227         if (dpi_use_dsi_pll(dssdev))
 228                 dsi_runtime_put(dpi.dsidev);
 229 err_get_dsi:
 230         dispc_runtime_put();
 231 err_get_dispc:
 232         if (cpu_is_omap34xx())
 233                 regulator_disable(dpi.vdds_dsi_reg);
 234 err_reg_enable:
 235         omap_dss_stop_device(dssdev);
 236 err_start_dev:
 237         return r;
 238 }
 239 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 240
 241 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 242 {
 243         dss_mgr_disable(dssdev->manager);
 244
 245         if (dpi_use_dsi_pll(dssdev)) {
 246                 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
 247                 dsi_pll_uninit(dpi.dsidev, true);
 248                 dsi_runtime_put(dpi.dsidev);
 249         }
 250
 251         dispc_runtime_put();
 252
 253         if (cpu_is_omap34xx())
 254                 regulator_disable(dpi.vdds_dsi_reg);
 255
 256         omap_dss_stop_device(dssdev);
 257 }
 258 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 259
 260 void dpi_set_timings(struct omap_dss_device *dssdev,
 261                         struct omap_video_timings *timings)
 262 {
 263         int r;
 264
 265         DSSDBG("dpi_set_timings\n");
 266         dssdev->panel.timings = *timings;
 267         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 268                 r = dispc_runtime_get();
 269                 if (r)
 270                         return;
 271
 272                 dpi_set_mode(dssdev);
 273
 274                 dispc_runtime_put();
 275         } else {
 276                 dss_mgr_set_timings(dssdev->manager, timings);
 277         }
 278 }
 279 EXPORT_SYMBOL(dpi_set_timings);
 280
 281 int dpi_check_timings(struct omap_dss_device *dssdev,
 282                         struct omap_video_timings *timings)
 283 {
 284         int r;
 285         int lck_div, pck_div;
 286         unsigned long fck;
 287         unsigned long pck;
 288         struct dispc_clock_info dispc_cinfo;
 289
 290         if (dss_mgr_check_timings(dssdev->manager, timings))
 291                 return -EINVAL;
 292
 293         if (timings->pixel_clock == 0)
 294                 return -EINVAL;
 295
 296         if (dpi_use_dsi_pll(dssdev)) {
 297                 struct dsi_clock_info dsi_cinfo;
 298                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
 299                                 timings->pixel_clock * 1000,
 300                                 &dsi_cinfo, &dispc_cinfo);
 301
 302                 if (r)
 303                         return r;
 304
 305                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 306         } else {
 307                 struct dss_clock_info dss_cinfo;
 308                 r = dss_calc_clock_div(timings->pixel_clock * 1000,
 309                                 &dss_cinfo, &dispc_cinfo);
 310
 311                 if (r)
 312                         return r;
 313
 314                 fck = dss_cinfo.fck;
 315         }
 316
 317         lck_div = dispc_cinfo.lck_div;
 318         pck_div = dispc_cinfo.pck_div;
 319
 320         pck = fck / lck_div / pck_div / 1000;
 321
 322         timings->pixel_clock = pck;
 323
 324         return 0;
 325 }
 326 EXPORT_SYMBOL(dpi_check_timings);
 327
 328 static int __init dpi_init_display(struct omap_dss_device *dssdev)
 329 {
 330         DSSDBG("init_display\n");
 331
 332         if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
 333                 struct regulator *vdds_dsi;
 334
 335                 vdds_dsi = dss_get_vdds_dsi();
 336
 337                 if (IS_ERR(vdds_dsi)) {
 338                         DSSERR("can't get VDDS_DSI regulator\n");
 339                         return PTR_ERR(vdds_dsi);
 340                 }
 341
 342                 dpi.vdds_dsi_reg = vdds_dsi;
 343         }
 344
 345         if (dpi_use_dsi_pll(dssdev)) {
 346                 enum omap_dss_clk_source dispc_fclk_src =
 347                         dssdev->clocks.dispc.dispc_fclk_src;
 348                 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
 349         }
 350
 351         return 0;
 352 }
 353
 354 static void __init dpi_probe_pdata(struct platform_device *pdev)
 355 {
 356         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 357         int i, r;
 358
 359         for (i = 0; i < pdata->num_devices; ++i) {
 360                 struct omap_dss_device *dssdev = pdata->devices[i];
 361
 362                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 363                         continue;
 364
 365                 r = dpi_init_display(dssdev);
 366                 if (r) {
 367                         DSSERR("device %s init failed: %d\n", dssdev->name, r);
 368                         continue;
 369                 }
 370
 371                 r = omap_dss_register_device(dssdev, &pdev->dev, i);
 372                 if (r)
 373                         DSSERR("device %s register failed: %d\n",
 374                                         dssdev->name, r);
 375         }
 376 }
 377
 378 static int __init omap_dpi_probe(struct platform_device *pdev)
 379 {
 380         dpi_probe_pdata(pdev);
 381
 382         return 0;
 383 }
 384
 385 static int __exit omap_dpi_remove(struct platform_device *pdev)
 386 {
 387         omap_dss_unregister_child_devices(&pdev->dev);
 388
 389         return 0;
 390 }
 391
 392 static struct platform_driver omap_dpi_driver = {
 393         .remove         = __exit_p(omap_dpi_remove),
 394         .driver         = {
 395                 .name   = "omapdss_dpi",
 396                 .owner  = THIS_MODULE,
 397         },
 398 };
 399
 400 int __init dpi_init_platform_driver(void)
 401 {
 402         return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
 403 }
 404
 405 void __exit dpi_uninit_platform_driver(void)
 406 {
 407         platform_driver_unregister(&omap_dpi_driver);
 408 }