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         dispc_mgr_set_io_pad_mode(DSS_IO_PAD_MODE_BYPASS);
 164         dispc_mgr_enable_stallmode(dssdev->manager->id, false);
 165
 166         dispc_mgr_set_lcd_display_type(dssdev->manager->id,
 167                         OMAP_DSS_LCD_DISPLAY_TFT);
 168         dispc_mgr_set_tft_data_lines(dssdev->manager->id,
 169                         dssdev->phy.dpi.data_lines);
 170 }
 171
 172 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 173 {
 174         int r;
 175
 176         if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
 177                 DSSERR("no VDSS_DSI regulator\n");
 178                 return -ENODEV;
 179         }
 180
 181         if (dssdev->manager == NULL) {
 182                 DSSERR("failed to enable display: no manager\n");
 183                 return -ENODEV;
 184         }
 185
 186         r = omap_dss_start_device(dssdev);
 187         if (r) {
 188                 DSSERR("failed to start device\n");
 189                 goto err_start_dev;
 190         }
 191
 192         if (cpu_is_omap34xx()) {
 193                 r = regulator_enable(dpi.vdds_dsi_reg);
 194                 if (r)
 195                         goto err_reg_enable;
 196         }
 197
 198         r = dispc_runtime_get();
 199         if (r)
 200                 goto err_get_dispc;
 201
 202         dpi_basic_init(dssdev);
 203
 204         if (dpi_use_dsi_pll(dssdev)) {
 205                 r = dsi_runtime_get(dpi.dsidev);
 206                 if (r)
 207                         goto err_get_dsi;
 208
 209                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 210                 if (r)
 211                         goto err_dsi_pll_init;
 212         }
 213
 214         r = dpi_set_mode(dssdev);
 215         if (r)
 216                 goto err_set_mode;
 217
 218         mdelay(2);
 219
 220         r = dss_mgr_enable(dssdev->manager);
 221         if (r)
 222                 goto err_mgr_enable;
 223
 224         return 0;
 225
 226 err_mgr_enable:
 227 err_set_mode:
 228         if (dpi_use_dsi_pll(dssdev))
 229                 dsi_pll_uninit(dpi.dsidev, true);
 230 err_dsi_pll_init:
 231         if (dpi_use_dsi_pll(dssdev))
 232                 dsi_runtime_put(dpi.dsidev);
 233 err_get_dsi:
 234         dispc_runtime_put();
 235 err_get_dispc:
 236         if (cpu_is_omap34xx())
 237                 regulator_disable(dpi.vdds_dsi_reg);
 238 err_reg_enable:
 239         omap_dss_stop_device(dssdev);
 240 err_start_dev:
 241         return r;
 242 }
 243 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 244
 245 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 246 {
 247         dss_mgr_disable(dssdev->manager);
 248
 249         if (dpi_use_dsi_pll(dssdev)) {
 250                 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
 251                 dsi_pll_uninit(dpi.dsidev, true);
 252                 dsi_runtime_put(dpi.dsidev);
 253         }
 254
 255         dispc_runtime_put();
 256
 257         if (cpu_is_omap34xx())
 258                 regulator_disable(dpi.vdds_dsi_reg);
 259
 260         omap_dss_stop_device(dssdev);
 261 }
 262 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 263
 264 void dpi_set_timings(struct omap_dss_device *dssdev,
 265                         struct omap_video_timings *timings)
 266 {
 267         int r;
 268
 269         DSSDBG("dpi_set_timings\n");
 270         dssdev->panel.timings = *timings;
 271         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 272                 r = dispc_runtime_get();
 273                 if (r)
 274                         return;
 275
 276                 dpi_set_mode(dssdev);
 277
 278                 dispc_runtime_put();
 279         } else {
 280                 dss_mgr_set_timings(dssdev->manager, timings);
 281         }
 282 }
 283 EXPORT_SYMBOL(dpi_set_timings);
 284
 285 int dpi_check_timings(struct omap_dss_device *dssdev,
 286                         struct omap_video_timings *timings)
 287 {
 288         int r;
 289         int lck_div, pck_div;
 290         unsigned long fck;
 291         unsigned long pck;
 292         struct dispc_clock_info dispc_cinfo;
 293
 294         if (dss_mgr_check_timings(dssdev->manager, timings))
 295                 return -EINVAL;
 296
 297         if (timings->pixel_clock == 0)
 298                 return -EINVAL;
 299
 300         if (dpi_use_dsi_pll(dssdev)) {
 301                 struct dsi_clock_info dsi_cinfo;
 302                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
 303                                 timings->pixel_clock * 1000,
 304                                 &dsi_cinfo, &dispc_cinfo);
 305
 306                 if (r)
 307                         return r;
 308
 309                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 310         } else {
 311                 struct dss_clock_info dss_cinfo;
 312                 r = dss_calc_clock_div(timings->pixel_clock * 1000,
 313                                 &dss_cinfo, &dispc_cinfo);
 314
 315                 if (r)
 316                         return r;
 317
 318                 fck = dss_cinfo.fck;
 319         }
 320
 321         lck_div = dispc_cinfo.lck_div;
 322         pck_div = dispc_cinfo.pck_div;
 323
 324         pck = fck / lck_div / pck_div / 1000;
 325
 326         timings->pixel_clock = pck;
 327
 328         return 0;
 329 }
 330 EXPORT_SYMBOL(dpi_check_timings);
 331
 332 static int __init dpi_init_display(struct omap_dss_device *dssdev)
 333 {
 334         DSSDBG("init_display\n");
 335
 336         if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
 337                 struct regulator *vdds_dsi;
 338
 339                 vdds_dsi = dss_get_vdds_dsi();
 340
 341                 if (IS_ERR(vdds_dsi)) {
 342                         DSSERR("can't get VDDS_DSI regulator\n");
 343                         return PTR_ERR(vdds_dsi);
 344                 }
 345
 346                 dpi.vdds_dsi_reg = vdds_dsi;
 347         }
 348
 349         if (dpi_use_dsi_pll(dssdev)) {
 350                 enum omap_dss_clk_source dispc_fclk_src =
 351                         dssdev->clocks.dispc.dispc_fclk_src;
 352                 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void __init dpi_probe_pdata(struct platform_device *pdev)
 359 {
 360         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 361         int i, r;
 362
 363         for (i = 0; i < pdata->num_devices; ++i) {
 364                 struct omap_dss_device *dssdev = pdata->devices[i];
 365
 366                 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
 367                         continue;
 368
 369                 r = dpi_init_display(dssdev);
 370                 if (r) {
 371                         DSSERR("device %s init failed: %d\n", dssdev->name, r);
 372                         continue;
 373                 }
 374
 375                 r = omap_dss_register_device(dssdev, &pdev->dev, i);
 376                 if (r)
 377                         DSSERR("device %s register failed: %d\n",
 378                                         dssdev->name, r);
 379         }
 380 }
 381
 382 static int __init omap_dpi_probe(struct platform_device *pdev)
 383 {
 384         dpi_probe_pdata(pdev);
 385
 386         return 0;
 387 }
 388
 389 static int __exit omap_dpi_remove(struct platform_device *pdev)
 390 {
 391         omap_dss_unregister_child_devices(&pdev->dev);
 392
 393         return 0;
 394 }
 395
 396 static struct platform_driver omap_dpi_driver = {
 397         .remove         = __exit_p(omap_dpi_remove),
 398         .driver         = {
 399                 .name   = "omapdss_dpi",
 400                 .owner  = THIS_MODULE,
 401         },
 402 };
 403
 404 int __init dpi_init_platform_driver(void)
 405 {
 406         return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
 407 }
 408
 409 void __exit dpi_uninit_platform_driver(void)
 410 {
 411         platform_driver_unregister(&omap_dpi_driver);
 412 }