Pileus Git - ~andy/linux/blob - 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
  35 #include "dss.h"
  36 #include "dss_features.h"
  37
  38 static struct {
  39         struct regulator *vdds_dsi_reg;
  40         struct platform_device *dsidev;
  41
  42         struct mutex lock;
  43
  44         struct omap_video_timings timings;
  45         struct dss_lcd_mgr_config mgr_config;
  46         int data_lines;
  47 } dpi;
  48
  49 static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
  50 {
  51         int dsi_module;
  52
  53         dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;
  54
  55         return dsi_get_dsidev_from_id(dsi_module);
  56 }
  57
  58 static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
  59 {
  60         if (dssdev->clocks.dispc.dispc_fclk_src ==
  61                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  62                         dssdev->clocks.dispc.dispc_fclk_src ==
  63                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
  64                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  65                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  66                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  67                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
  68                 return true;
  69         else
  70                 return false;
  71 }
  72
  73 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
  74                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  75                 int *pck_div)
  76 {
  77         struct dsi_clock_info dsi_cinfo;
  78         struct dispc_clock_info dispc_cinfo;
  79         int r;
  80
  81         r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
  82                         &dispc_cinfo);
  83         if (r)
  84                 return r;
  85
  86         r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
  87         if (r)
  88                 return r;
  89
  90         dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
  91
  92         dpi.mgr_config.clock_info = dispc_cinfo;
  93
  94         *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
  95         *lck_div = dispc_cinfo.lck_div;
  96         *pck_div = dispc_cinfo.pck_div;
  97
  98         return 0;
  99 }
 100
 101 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
 102                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 103                 int *pck_div)
 104 {
 105         struct dss_clock_info dss_cinfo;
 106         struct dispc_clock_info dispc_cinfo;
 107         int r;
 108
 109         r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
 110         if (r)
 111                 return r;
 112
 113         r = dss_set_clock_div(&dss_cinfo);
 114         if (r)
 115                 return r;
 116
 117         dpi.mgr_config.clock_info = dispc_cinfo;
 118
 119         *fck = dss_cinfo.fck;
 120         *lck_div = dispc_cinfo.lck_div;
 121         *pck_div = dispc_cinfo.pck_div;
 122
 123         return 0;
 124 }
 125
 126 static int dpi_set_mode(struct omap_dss_device *dssdev)
 127 {
 128         struct omap_video_timings *t = &dpi.timings;
 129         int lck_div = 0, pck_div = 0;
 130         unsigned long fck = 0;
 131         unsigned long pck;
 132         int r = 0;
 133
 134         if (dpi_use_dsi_pll(dssdev))
 135                 r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
 136                                 &lck_div, &pck_div);
 137         else
 138                 r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
 139                                 &lck_div, &pck_div);
 140         if (r)
 141                 return r;
 142
 143         pck = fck / lck_div / pck_div / 1000;
 144
 145         if (pck != t->pixel_clock) {
 146                 DSSWARN("Could not find exact pixel clock. "
 147                                 "Requested %d kHz, got %lu kHz\n",
 148                                 t->pixel_clock, pck);
 149
 150                 t->pixel_clock = pck;
 151         }
 152
 153         dss_mgr_set_timings(dssdev->manager, t);
 154
 155         return 0;
 156 }
 157
 158 static void dpi_config_lcd_manager(struct omap_dss_device *dssdev)
 159 {
 160         dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
 161
 162         dpi.mgr_config.stallmode = false;
 163         dpi.mgr_config.fifohandcheck = false;
 164
 165         dpi.mgr_config.video_port_width = dpi.data_lines;
 166
 167         dpi.mgr_config.lcden_sig_polarity = 0;
 168
 169         dss_mgr_set_lcd_config(dssdev->manager, &dpi.mgr_config);
 170 }
 171
 172 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 173 {
 174         int r;
 175
 176         mutex_lock(&dpi.lock);
 177
 178         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) && !dpi.vdds_dsi_reg) {
 179                 DSSERR("no VDSS_DSI regulator\n");
 180                 r = -ENODEV;
 181                 goto err_no_reg;
 182         }
 183
 184         if (dssdev->manager == NULL) {
 185                 DSSERR("failed to enable display: no manager\n");
 186                 r = -ENODEV;
 187                 goto err_no_mgr;
 188         }
 189
 190         r = omap_dss_start_device(dssdev);
 191         if (r) {
 192                 DSSERR("failed to start device\n");
 193                 goto err_start_dev;
 194         }
 195
 196         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI)) {
 197                 r = regulator_enable(dpi.vdds_dsi_reg);
 198                 if (r)
 199                         goto err_reg_enable;
 200         }
 201
 202         r = dispc_runtime_get();
 203         if (r)
 204                 goto err_get_dispc;
 205
 206         if (dpi_use_dsi_pll(dssdev)) {
 207                 r = dsi_runtime_get(dpi.dsidev);
 208                 if (r)
 209                         goto err_get_dsi;
 210
 211                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 212                 if (r)
 213                         goto err_dsi_pll_init;
 214         }
 215
 216         r = dpi_set_mode(dssdev);
 217         if (r)
 218                 goto err_set_mode;
 219
 220         dpi_config_lcd_manager(dssdev);
 221
 222         mdelay(2);
 223
 224         r = dss_mgr_enable(dssdev->manager);
 225         if (r)
 226                 goto err_mgr_enable;
 227
 228         mutex_unlock(&dpi.lock);
 229
 230         return 0;
 231
 232 err_mgr_enable:
 233 err_set_mode:
 234         if (dpi_use_dsi_pll(dssdev))
 235                 dsi_pll_uninit(dpi.dsidev, true);
 236 err_dsi_pll_init:
 237         if (dpi_use_dsi_pll(dssdev))
 238                 dsi_runtime_put(dpi.dsidev);
 239 err_get_dsi:
 240         dispc_runtime_put();
 241 err_get_dispc:
 242         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 243                 regulator_disable(dpi.vdds_dsi_reg);
 244 err_reg_enable:
 245         omap_dss_stop_device(dssdev);
 246 err_start_dev:
 247 err_no_mgr:
 248 err_no_reg:
 249         mutex_unlock(&dpi.lock);
 250         return r;
 251 }
 252 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 253
 254 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 255 {
 256         mutex_lock(&dpi.lock);
 257
 258         dss_mgr_disable(dssdev->manager);
 259
 260         if (dpi_use_dsi_pll(dssdev)) {
 261                 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
 262                 dsi_pll_uninit(dpi.dsidev, true);
 263                 dsi_runtime_put(dpi.dsidev);
 264         }
 265
 266         dispc_runtime_put();
 267
 268         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
 269                 regulator_disable(dpi.vdds_dsi_reg);
 270
 271         omap_dss_stop_device(dssdev);
 272
 273         mutex_unlock(&dpi.lock);
 274 }
 275 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 276
 277 void omapdss_dpi_set_timings(struct omap_dss_device *dssdev,
 278                 struct omap_video_timings *timings)
 279 {
 280         DSSDBG("dpi_set_timings\n");
 281
 282         mutex_lock(&dpi.lock);
 283
 284         dpi.timings = *timings;
 285
 286         mutex_unlock(&dpi.lock);
 287 }
 288 EXPORT_SYMBOL(omapdss_dpi_set_timings);
 289
 290 int dpi_check_timings(struct omap_dss_device *dssdev,
 291                         struct omap_video_timings *timings)
 292 {
 293         int r;
 294         int lck_div, pck_div;
 295         unsigned long fck;
 296         unsigned long pck;
 297         struct dispc_clock_info dispc_cinfo;
 298
 299         if (dss_mgr_check_timings(dssdev->manager, timings))
 300                 return -EINVAL;
 301
 302         if (timings->pixel_clock == 0)
 303                 return -EINVAL;
 304
 305         if (dpi_use_dsi_pll(dssdev)) {
 306                 struct dsi_clock_info dsi_cinfo;
 307                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
 308                                 timings->pixel_clock * 1000,
 309                                 &dsi_cinfo, &dispc_cinfo);
 310
 311                 if (r)
 312                         return r;
 313
 314                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 315         } else {
 316                 struct dss_clock_info dss_cinfo;
 317                 r = dss_calc_clock_div(timings->pixel_clock * 1000,
 318                                 &dss_cinfo, &dispc_cinfo);
 319
 320                 if (r)
 321                         return r;
 322
 323                 fck = dss_cinfo.fck;
 324         }
 325
 326         lck_div = dispc_cinfo.lck_div;
 327         pck_div = dispc_cinfo.pck_div;
 328
 329         pck = fck / lck_div / pck_div / 1000;
 330
 331         timings->pixel_clock = pck;
 332
 333         return 0;
 334 }
 335 EXPORT_SYMBOL(dpi_check_timings);
 336
 337 void omapdss_dpi_set_data_lines(struct omap_dss_device *dssdev, int data_lines)
 338 {
 339         mutex_lock(&dpi.lock);
 340
 341         dpi.data_lines = data_lines;
 342
 343         mutex_unlock(&dpi.lock);
 344 }
 345 EXPORT_SYMBOL(omapdss_dpi_set_data_lines);
 346
 347 static int __init dpi_init_display(struct omap_dss_device *dssdev)
 348 {
 349         DSSDBG("init_display\n");
 350
 351         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI) &&
 352                                         dpi.vdds_dsi_reg == NULL) {
 353                 struct regulator *vdds_dsi;
 354
 355                 vdds_dsi = dss_get_vdds_dsi();
 356
 357                 if (IS_ERR(vdds_dsi)) {
 358                         DSSERR("can't get VDDS_DSI regulator\n");
 359                         return PTR_ERR(vdds_dsi);
 360                 }
 361
 362                 dpi.vdds_dsi_reg = vdds_dsi;
 363         }
 364
 365         if (dpi_use_dsi_pll(dssdev)) {
 366                 enum omap_dss_clk_source dispc_fclk_src =
 367                         dssdev->clocks.dispc.dispc_fclk_src;
 368                 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
 369         }
 370
 371         return 0;
 372 }
 373
 374 static void __init dpi_probe_pdata(struct platform_device *pdev)
 375 {
 376         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 377         int i, r;
 378
 379         for (i = 0; i < pdata->num_devices; ++i) {
 380                 struct omap_dss_device *dssdev = pdata->devices[i];
 381
 382                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 383                         continue;
 384
 385                 r = dpi_init_display(dssdev);
 386                 if (r) {
 387                         DSSERR("device %s init failed: %d\n", dssdev->name, r);
 388                         continue;
 389                 }
 390
 391                 r = omap_dss_register_device(dssdev, &pdev->dev);
 392                 if (r)
 393                         DSSERR("device %s register failed: %d\n",
 394                                         dssdev->name, r);
 395         }
 396 }
 397
 398 static int __init omap_dpi_probe(struct platform_device *pdev)
 399 {
 400         mutex_init(&dpi.lock);
 401
 402         dpi_probe_pdata(pdev);
 403
 404         return 0;
 405 }
 406
 407 static int __exit omap_dpi_remove(struct platform_device *pdev)
 408 {
 409         omap_dss_unregister_child_devices(&pdev->dev);
 410
 411         return 0;
 412 }
 413
 414 static struct platform_driver omap_dpi_driver = {
 415         .remove         = __exit_p(omap_dpi_remove),
 416         .driver         = {
 417                 .name   = "omapdss_dpi",
 418                 .owner  = THIS_MODULE,
 419         },
 420 };
 421
 422 int __init dpi_init_platform_driver(void)
 423 {
 424         return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
 425 }
 426
 427 void __exit dpi_uninit_platform_driver(void)
 428 {
 429         platform_driver_unregister(&omap_dpi_driver);
 430 }