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/err.h>
  28 #include <linux/errno.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/regulator/consumer.h>
  31
  32 #include <video/omapdss.h>
  33 #include <plat/cpu.h>
  34
  35 #include "dss.h"
  36
  37 static struct {
  38         struct regulator *vdds_dsi_reg;
  39         struct platform_device *dsidev;
  40 } dpi;
  41
  42 static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
  43 {
  44         int dsi_module;
  45
  46         dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;
  47
  48         return dsi_get_dsidev_from_id(dsi_module);
  49 }
  50
  51 static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
  52 {
  53         if (dssdev->clocks.dispc.dispc_fclk_src ==
  54                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  55                         dssdev->clocks.dispc.dispc_fclk_src ==
  56                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
  57                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  58                         OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
  59                         dssdev->clocks.dispc.channel.lcd_clk_src ==
  60                         OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
  61                 return true;
  62         else
  63                 return false;
  64 }
  65
  66 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, bool is_tft,
  67                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  68                 int *pck_div)
  69 {
  70         struct dsi_clock_info dsi_cinfo;
  71         struct dispc_clock_info dispc_cinfo;
  72         int r;
  73
  74         r = dsi_pll_calc_clock_div_pck(dpi.dsidev, is_tft, pck_req,
  75                         &dsi_cinfo, &dispc_cinfo);
  76         if (r)
  77                 return r;
  78
  79         r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
  80         if (r)
  81                 return r;
  82
  83         dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
  84
  85         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
  86         if (r)
  87                 return r;
  88
  89         *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
  90         *lck_div = dispc_cinfo.lck_div;
  91         *pck_div = dispc_cinfo.pck_div;
  92
  93         return 0;
  94 }
  95
  96 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev, bool is_tft,
  97                 unsigned long pck_req, unsigned long *fck, int *lck_div,
  98                 int *pck_div)
  99 {
 100         struct dss_clock_info dss_cinfo;
 101         struct dispc_clock_info dispc_cinfo;
 102         int r;
 103
 104         r = dss_calc_clock_div(is_tft, pck_req, &dss_cinfo, &dispc_cinfo);
 105         if (r)
 106                 return r;
 107
 108         r = dss_set_clock_div(&dss_cinfo);
 109         if (r)
 110                 return r;
 111
 112         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 113         if (r)
 114                 return r;
 115
 116         *fck = dss_cinfo.fck;
 117         *lck_div = dispc_cinfo.lck_div;
 118         *pck_div = dispc_cinfo.pck_div;
 119
 120         return 0;
 121 }
 122
 123 static int dpi_set_mode(struct omap_dss_device *dssdev)
 124 {
 125         struct omap_video_timings *t = &dssdev->panel.timings;
 126         int lck_div = 0, pck_div = 0;
 127         unsigned long fck = 0;
 128         unsigned long pck;
 129         bool is_tft;
 130         int r = 0;
 131
 132         dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
 133                         dssdev->panel.acbi, dssdev->panel.acb);
 134
 135         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 136
 137         if (dpi_use_dsi_pll(dssdev))
 138                 r = dpi_set_dsi_clk(dssdev, is_tft, t->pixel_clock * 1000,
 139                                 &fck, &lck_div, &pck_div);
 140         else
 141                 r = dpi_set_dispc_clk(dssdev, is_tft, t->pixel_clock * 1000,
 142                                 &fck, &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         dispc_set_lcd_timings(dssdev->manager->id, 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_set_parallel_interface_mode(dssdev->manager->id,
 168                         OMAP_DSS_PARALLELMODE_BYPASS);
 169         dispc_set_lcd_display_type(dssdev->manager->id, is_tft ?
 170                         OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
 171         dispc_set_tft_data_lines(dssdev->manager->id,
 172                         dssdev->phy.dpi.data_lines);
 173 }
 174
 175 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 176 {
 177         int r;
 178
 179         r = omap_dss_start_device(dssdev);
 180         if (r) {
 181                 DSSERR("failed to start device\n");
 182                 goto err_start_dev;
 183         }
 184
 185         if (cpu_is_omap34xx()) {
 186                 r = regulator_enable(dpi.vdds_dsi_reg);
 187                 if (r)
 188                         goto err_reg_enable;
 189         }
 190
 191         r = dss_runtime_get();
 192         if (r)
 193                 goto err_get_dss;
 194
 195         r = dispc_runtime_get();
 196         if (r)
 197                 goto err_get_dispc;
 198
 199         dpi_basic_init(dssdev);
 200
 201         if (dpi_use_dsi_pll(dssdev)) {
 202                 r = dsi_runtime_get(dpi.dsidev);
 203                 if (r)
 204                         goto err_get_dsi;
 205
 206                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 207                 if (r)
 208                         goto err_dsi_pll_init;
 209         }
 210
 211         r = dpi_set_mode(dssdev);
 212         if (r)
 213                 goto err_set_mode;
 214
 215         mdelay(2);
 216
 217         dssdev->manager->enable(dssdev->manager);
 218
 219         return 0;
 220
 221 err_set_mode:
 222         if (dpi_use_dsi_pll(dssdev))
 223                 dsi_pll_uninit(dpi.dsidev, true);
 224 err_dsi_pll_init:
 225         if (dpi_use_dsi_pll(dssdev))
 226                 dsi_runtime_put(dpi.dsidev);
 227 err_get_dsi:
 228         dispc_runtime_put();
 229 err_get_dispc:
 230         dss_runtime_put();
 231 err_get_dss:
 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         dssdev->manager->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         dss_runtime_put();
 253
 254         if (cpu_is_omap34xx())
 255                 regulator_disable(dpi.vdds_dsi_reg);
 256
 257         omap_dss_stop_device(dssdev);
 258 }
 259 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 260
 261 void dpi_set_timings(struct omap_dss_device *dssdev,
 262                         struct omap_video_timings *timings)
 263 {
 264         int r;
 265
 266         DSSDBG("dpi_set_timings\n");
 267         dssdev->panel.timings = *timings;
 268         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 269                 r = dss_runtime_get();
 270                 if (r)
 271                         return;
 272
 273                 r = dispc_runtime_get();
 274                 if (r) {
 275                         dss_runtime_put();
 276                         return;
 277                 }
 278
 279                 dpi_set_mode(dssdev);
 280                 dispc_go(dssdev->manager->id);
 281
 282                 dispc_runtime_put();
 283                 dss_runtime_put();
 284         }
 285 }
 286 EXPORT_SYMBOL(dpi_set_timings);
 287
 288 int dpi_check_timings(struct omap_dss_device *dssdev,
 289                         struct omap_video_timings *timings)
 290 {
 291         bool is_tft;
 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 (!dispc_lcd_timings_ok(timings))
 299                 return -EINVAL;
 300
 301         if (timings->pixel_clock == 0)
 302                 return -EINVAL;
 303
 304         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 305
 306         if (dpi_use_dsi_pll(dssdev)) {
 307                 struct dsi_clock_info dsi_cinfo;
 308                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev, is_tft,
 309                                 timings->pixel_clock * 1000,
 310                                 &dsi_cinfo, &dispc_cinfo);
 311
 312                 if (r)
 313                         return r;
 314
 315                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 316         } else {
 317                 struct dss_clock_info dss_cinfo;
 318                 r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,
 319                                 &dss_cinfo, &dispc_cinfo);
 320
 321                 if (r)
 322                         return r;
 323
 324                 fck = dss_cinfo.fck;
 325         }
 326
 327         lck_div = dispc_cinfo.lck_div;
 328         pck_div = dispc_cinfo.pck_div;
 329
 330         pck = fck / lck_div / pck_div / 1000;
 331
 332         timings->pixel_clock = pck;
 333
 334         return 0;
 335 }
 336 EXPORT_SYMBOL(dpi_check_timings);
 337
 338 int dpi_init_display(struct omap_dss_device *dssdev)
 339 {
 340         DSSDBG("init_display\n");
 341
 342         if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
 343                 struct regulator *vdds_dsi;
 344
 345                 vdds_dsi = dss_get_vdds_dsi();
 346
 347                 if (IS_ERR(vdds_dsi)) {
 348                         DSSERR("can't get VDDS_DSI regulator\n");
 349                         return PTR_ERR(vdds_dsi);
 350                 }
 351
 352                 dpi.vdds_dsi_reg = vdds_dsi;
 353         }
 354
 355         if (dpi_use_dsi_pll(dssdev)) {
 356                 enum omap_dss_clk_source dispc_fclk_src =
 357                         dssdev->clocks.dispc.dispc_fclk_src;
 358                 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
 359         }
 360
 361         return 0;
 362 }
 363
 364 int dpi_init(void)
 365 {
 366         return 0;
 367 }
 368
 369 void dpi_exit(void)
 370 {
 371 }
 372