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 } dpi;
  42
  43 static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
  44 {
  45         int dsi_module;
  46
  47         dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;
  48
  49         return dsi_get_dsidev_from_id(dsi_module);
  50 }
  51
  52 static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
  53 {
  54         if (dssdev->clocks.dispc.dispc_fclk_src ==
  55                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  56                         dssdev->clocks.dispc.dispc_fclk_src ==
  57                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
  58                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  59                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  60                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  61                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
  62                 return true;
  63         else
  64                 return false;
  65 }
  66
  67 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
  68                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  69                 int *pck_div)
  70 {
  71         struct dsi_clock_info dsi_cinfo;
  72         struct dispc_clock_info dispc_cinfo;
  73         int r;
  74
  75         r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
  76                         &dispc_cinfo);
  77         if (r)
  78                 return r;
  79
  80         r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
  81         if (r)
  82                 return r;
  83
  84         dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
  85
  86         r = dispc_mgr_set_clock_div(dssdev->manager->id, &dispc_cinfo);
  87         if (r) {
  88                 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
  89                 return r;
  90         }
  91
  92         *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
  93         *lck_div = dispc_cinfo.lck_div;
  94         *pck_div = dispc_cinfo.pck_div;
  95
  96         return 0;
  97 }
  98
  99 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
 100                 unsigned long pck_req, unsigned long *fck, int *lck_div,
 101                 int *pck_div)
 102 {
 103         struct dss_clock_info dss_cinfo;
 104         struct dispc_clock_info dispc_cinfo;
 105         int r;
 106
 107         r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
 108         if (r)
 109                 return r;
 110
 111         r = dss_set_clock_div(&dss_cinfo);
 112         if (r)
 113                 return r;
 114
 115         r = dispc_mgr_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 116         if (r)
 117                 return r;
 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 = &dssdev->panel.timings;
 129         int lck_div = 0, pck_div = 0;
 130         unsigned long fck = 0;
 131         unsigned long pck;
 132         int r = 0;
 133
 134         dispc_mgr_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
 135                         dssdev->panel.acbi, dssdev->panel.acb);
 136
 137         if (dpi_use_dsi_pll(dssdev))
 138                 r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
 139                                 &lck_div, &pck_div);
 140         else
 141                 r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
 142                                 &lck_div, &pck_div);
 143         if (r)
 144                 return r;
 145
 146         pck = fck / lck_div / pck_div / 1000;
 147
 148         if (pck != t->pixel_clock) {
 149                 DSSWARN("Could not find exact pixel clock. "
 150                                 "Requested %d kHz, got %lu kHz\n",
 151                                 t->pixel_clock, pck);
 152
 153                 t->pixel_clock = pck;
 154         }
 155
 156         dss_mgr_set_timings(dssdev->manager, t);
 157
 158         return 0;
 159 }
 160
 161 static void dpi_basic_init(struct omap_dss_device *dssdev)
 162 {
 163         bool is_tft;
 164
 165         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 166
 167         dispc_mgr_set_io_pad_mode(DSS_IO_PAD_MODE_BYPASS);
 168         dispc_mgr_enable_stallmode(dssdev->manager->id, false);
 169
 170         dispc_mgr_set_lcd_display_type(dssdev->manager->id, is_tft ?
 171                         OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
 172         dispc_mgr_set_tft_data_lines(dssdev->manager->id,
 173                         dssdev->phy.dpi.data_lines);
 174 }
 175
 176 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 177 {
 178         int r;
 179
 180         if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
 181                 DSSERR("no VDSS_DSI regulator\n");
 182                 return -ENODEV;
 183         }
 184
 185         if (dssdev->manager == NULL) {
 186                 DSSERR("failed to enable display: no manager\n");
 187                 return -ENODEV;
 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 (cpu_is_omap34xx()) {
 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         dpi_basic_init(dssdev);
 207
 208         if (dpi_use_dsi_pll(dssdev)) {
 209                 r = dsi_runtime_get(dpi.dsidev);
 210                 if (r)
 211                         goto err_get_dsi;
 212
 213                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 214                 if (r)
 215                         goto err_dsi_pll_init;
 216         }
 217
 218         r = dpi_set_mode(dssdev);
 219         if (r)
 220                 goto err_set_mode;
 221
 222         mdelay(2);
 223
 224         r = dss_mgr_enable(dssdev->manager);
 225         if (r)
 226                 goto err_mgr_enable;
 227
 228         return 0;
 229
 230 err_mgr_enable:
 231 err_set_mode:
 232         if (dpi_use_dsi_pll(dssdev))
 233                 dsi_pll_uninit(dpi.dsidev, true);
 234 err_dsi_pll_init:
 235         if (dpi_use_dsi_pll(dssdev))
 236                 dsi_runtime_put(dpi.dsidev);
 237 err_get_dsi:
 238         dispc_runtime_put();
 239 err_get_dispc:
 240         if (cpu_is_omap34xx())
 241                 regulator_disable(dpi.vdds_dsi_reg);
 242 err_reg_enable:
 243         omap_dss_stop_device(dssdev);
 244 err_start_dev:
 245         return r;
 246 }
 247 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 248
 249 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 250 {
 251         dss_mgr_disable(dssdev->manager);
 252
 253         if (dpi_use_dsi_pll(dssdev)) {
 254                 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
 255                 dsi_pll_uninit(dpi.dsidev, true);
 256                 dsi_runtime_put(dpi.dsidev);
 257         }
 258
 259         dispc_runtime_put();
 260
 261         if (cpu_is_omap34xx())
 262                 regulator_disable(dpi.vdds_dsi_reg);
 263
 264         omap_dss_stop_device(dssdev);
 265 }
 266 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 267
 268 void dpi_set_timings(struct omap_dss_device *dssdev,
 269                         struct omap_video_timings *timings)
 270 {
 271         int r;
 272
 273         DSSDBG("dpi_set_timings\n");
 274         dssdev->panel.timings = *timings;
 275         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 276                 r = dispc_runtime_get();
 277                 if (r)
 278                         return;
 279
 280                 dpi_set_mode(dssdev);
 281
 282                 dispc_runtime_put();
 283         } else {
 284                 dss_mgr_set_timings(dssdev->manager, timings);
 285         }
 286 }
 287 EXPORT_SYMBOL(dpi_set_timings);
 288
 289 int dpi_check_timings(struct omap_dss_device *dssdev,
 290                         struct omap_video_timings *timings)
 291 {
 292         int r;
 293         int lck_div, pck_div;
 294         unsigned long fck;
 295         unsigned long pck;
 296         struct dispc_clock_info dispc_cinfo;
 297
 298         if (dss_mgr_check_timings(dssdev->manager, timings))
 299                 return -EINVAL;
 300
 301         if (timings->pixel_clock == 0)
 302                 return -EINVAL;
 303
 304         if (dpi_use_dsi_pll(dssdev)) {
 305                 struct dsi_clock_info dsi_cinfo;
 306                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
 307                                 timings->pixel_clock * 1000,
 308                                 &dsi_cinfo, &dispc_cinfo);
 309
 310                 if (r)
 311                         return r;
 312
 313                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 314         } else {
 315                 struct dss_clock_info dss_cinfo;
 316                 r = dss_calc_clock_div(timings->pixel_clock * 1000,
 317                                 &dss_cinfo, &dispc_cinfo);
 318
 319                 if (r)
 320                         return r;
 321
 322                 fck = dss_cinfo.fck;
 323         }
 324
 325         lck_div = dispc_cinfo.lck_div;
 326         pck_div = dispc_cinfo.pck_div;
 327
 328         pck = fck / lck_div / pck_div / 1000;
 329
 330         timings->pixel_clock = pck;
 331
 332         return 0;
 333 }
 334 EXPORT_SYMBOL(dpi_check_timings);
 335
 336 static int __init dpi_init_display(struct omap_dss_device *dssdev)
 337 {
 338         DSSDBG("init_display\n");
 339
 340         if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
 341                 struct regulator *vdds_dsi;
 342
 343                 vdds_dsi = dss_get_vdds_dsi();
 344
 345                 if (IS_ERR(vdds_dsi)) {
 346                         DSSERR("can't get VDDS_DSI regulator\n");
 347                         return PTR_ERR(vdds_dsi);
 348                 }
 349
 350                 dpi.vdds_dsi_reg = vdds_dsi;
 351         }
 352
 353         if (dpi_use_dsi_pll(dssdev)) {
 354                 enum omap_dss_clk_source dispc_fclk_src =
 355                         dssdev->clocks.dispc.dispc_fclk_src;
 356                 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
 357         }
 358
 359         return 0;
 360 }
 361
 362 static void __init dpi_probe_pdata(struct platform_device *pdev)
 363 {
 364         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 365         int i, r;
 366
 367         for (i = 0; i < pdata->num_devices; ++i) {
 368                 struct omap_dss_device *dssdev = pdata->devices[i];
 369
 370                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 371                         continue;
 372
 373                 r = dpi_init_display(dssdev);
 374                 if (r) {
 375                         DSSERR("device %s init failed: %d\n", dssdev->name, r);
 376                         continue;
 377                 }
 378
 379                 r = omap_dss_register_device(dssdev, &pdev->dev, i);
 380                 if (r)
 381                         DSSERR("device %s register failed: %d\n",
 382                                         dssdev->name, r);
 383         }
 384 }
 385
 386 static int __init omap_dpi_probe(struct platform_device *pdev)
 387 {
 388         dpi_probe_pdata(pdev);
 389
 390         return 0;
 391 }
 392
 393 static int __exit omap_dpi_remove(struct platform_device *pdev)
 394 {
 395         omap_dss_unregister_child_devices(&pdev->dev);
 396
 397         return 0;
 398 }
 399
 400 static struct platform_driver omap_dpi_driver = {
 401         .remove         = __exit_p(omap_dpi_remove),
 402         .driver         = {
 403                 .name   = "omapdss_dpi",
 404                 .owner  = THIS_MODULE,
 405         },
 406 };
 407
 408 int __init dpi_init_platform_driver(void)
 409 {
 410         return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
 411 }
 412
 413 void __exit dpi_uninit_platform_driver(void)
 414 {
 415         platform_driver_unregister(&omap_dpi_driver);
 416 }