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, bool is_tft,
  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, is_tft, pck_req,
  76                         &dsi_cinfo, &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, bool is_tft,
 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(is_tft, 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         bool is_tft;
 133         int r = 0;
 134
 135         dispc_mgr_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
 136                         dssdev->panel.acbi, dssdev->panel.acb);
 137
 138         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 139
 140         if (dpi_use_dsi_pll(dssdev))
 141                 r = dpi_set_dsi_clk(dssdev, is_tft, t->pixel_clock * 1000,
 142                                 &fck, &lck_div, &pck_div);
 143         else
 144                 r = dpi_set_dispc_clk(dssdev, is_tft, t->pixel_clock * 1000,
 145                                 &fck, &lck_div, &pck_div);
 146         if (r)
 147                 return r;
 148
 149         pck = fck / lck_div / pck_div / 1000;
 150
 151         if (pck != t->pixel_clock) {
 152                 DSSWARN("Could not find exact pixel clock. "
 153                                 "Requested %d kHz, got %lu kHz\n",
 154                                 t->pixel_clock, pck);
 155
 156                 t->pixel_clock = pck;
 157         }
 158
 159         dispc_mgr_set_lcd_timings(dssdev->manager->id, t);
 160
 161         return 0;
 162 }
 163
 164 static void dpi_basic_init(struct omap_dss_device *dssdev)
 165 {
 166         bool is_tft;
 167
 168         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 169
 170         dispc_mgr_set_io_pad_mode(DSS_IO_PAD_MODE_BYPASS);
 171         dispc_mgr_enable_stallmode(dssdev->manager->id, false);
 172
 173         dispc_mgr_set_lcd_display_type(dssdev->manager->id, is_tft ?
 174                         OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
 175         dispc_mgr_set_tft_data_lines(dssdev->manager->id,
 176                         dssdev->phy.dpi.data_lines);
 177 }
 178
 179 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 180 {
 181         int r;
 182
 183         if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
 184                 DSSERR("no VDSS_DSI regulator\n");
 185                 return -ENODEV;
 186         }
 187
 188         if (dssdev->manager == NULL) {
 189                 DSSERR("failed to enable display: no manager\n");
 190                 return -ENODEV;
 191         }
 192
 193         r = omap_dss_start_device(dssdev);
 194         if (r) {
 195                 DSSERR("failed to start device\n");
 196                 goto err_start_dev;
 197         }
 198
 199         if (cpu_is_omap34xx()) {
 200                 r = regulator_enable(dpi.vdds_dsi_reg);
 201                 if (r)
 202                         goto err_reg_enable;
 203         }
 204
 205         r = dss_runtime_get();
 206         if (r)
 207                 goto err_get_dss;
 208
 209         r = dispc_runtime_get();
 210         if (r)
 211                 goto err_get_dispc;
 212
 213         dpi_basic_init(dssdev);
 214
 215         if (dpi_use_dsi_pll(dssdev)) {
 216                 r = dsi_runtime_get(dpi.dsidev);
 217                 if (r)
 218                         goto err_get_dsi;
 219
 220                 r = dsi_pll_init(dpi.dsidev, 0, 1);
 221                 if (r)
 222                         goto err_dsi_pll_init;
 223         }
 224
 225         r = dpi_set_mode(dssdev);
 226         if (r)
 227                 goto err_set_mode;
 228
 229         mdelay(2);
 230
 231         dssdev->manager->enable(dssdev->manager);
 232
 233         return 0;
 234
 235 err_set_mode:
 236         if (dpi_use_dsi_pll(dssdev))
 237                 dsi_pll_uninit(dpi.dsidev, true);
 238 err_dsi_pll_init:
 239         if (dpi_use_dsi_pll(dssdev))
 240                 dsi_runtime_put(dpi.dsidev);
 241 err_get_dsi:
 242         dispc_runtime_put();
 243 err_get_dispc:
 244         dss_runtime_put();
 245 err_get_dss:
 246         if (cpu_is_omap34xx())
 247                 regulator_disable(dpi.vdds_dsi_reg);
 248 err_reg_enable:
 249         omap_dss_stop_device(dssdev);
 250 err_start_dev:
 251         return r;
 252 }
 253 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 254
 255 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 256 {
 257         dssdev->manager->disable(dssdev->manager);
 258
 259         if (dpi_use_dsi_pll(dssdev)) {
 260                 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
 261                 dsi_pll_uninit(dpi.dsidev, true);
 262                 dsi_runtime_put(dpi.dsidev);
 263         }
 264
 265         dispc_runtime_put();
 266         dss_runtime_put();
 267
 268         if (cpu_is_omap34xx())
 269                 regulator_disable(dpi.vdds_dsi_reg);
 270
 271         omap_dss_stop_device(dssdev);
 272 }
 273 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 274
 275 void dpi_set_timings(struct omap_dss_device *dssdev,
 276                         struct omap_video_timings *timings)
 277 {
 278         int r;
 279
 280         DSSDBG("dpi_set_timings\n");
 281         dssdev->panel.timings = *timings;
 282         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 283                 r = dss_runtime_get();
 284                 if (r)
 285                         return;
 286
 287                 r = dispc_runtime_get();
 288                 if (r) {
 289                         dss_runtime_put();
 290                         return;
 291                 }
 292
 293                 dpi_set_mode(dssdev);
 294                 dispc_mgr_go(dssdev->manager->id);
 295
 296                 dispc_runtime_put();
 297                 dss_runtime_put();
 298         }
 299 }
 300 EXPORT_SYMBOL(dpi_set_timings);
 301
 302 int dpi_check_timings(struct omap_dss_device *dssdev,
 303                         struct omap_video_timings *timings)
 304 {
 305         bool is_tft;
 306         int r;
 307         int lck_div, pck_div;
 308         unsigned long fck;
 309         unsigned long pck;
 310         struct dispc_clock_info dispc_cinfo;
 311
 312         if (!dispc_lcd_timings_ok(timings))
 313                 return -EINVAL;
 314
 315         if (timings->pixel_clock == 0)
 316                 return -EINVAL;
 317
 318         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 319
 320         if (dpi_use_dsi_pll(dssdev)) {
 321                 struct dsi_clock_info dsi_cinfo;
 322                 r = dsi_pll_calc_clock_div_pck(dpi.dsidev, is_tft,
 323                                 timings->pixel_clock * 1000,
 324                                 &dsi_cinfo, &dispc_cinfo);
 325
 326                 if (r)
 327                         return r;
 328
 329                 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
 330         } else {
 331                 struct dss_clock_info dss_cinfo;
 332                 r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,
 333                                 &dss_cinfo, &dispc_cinfo);
 334
 335                 if (r)
 336                         return r;
 337
 338                 fck = dss_cinfo.fck;
 339         }
 340
 341         lck_div = dispc_cinfo.lck_div;
 342         pck_div = dispc_cinfo.pck_div;
 343
 344         pck = fck / lck_div / pck_div / 1000;
 345
 346         timings->pixel_clock = pck;
 347
 348         return 0;
 349 }
 350 EXPORT_SYMBOL(dpi_check_timings);
 351
 352 int dpi_init_display(struct omap_dss_device *dssdev)
 353 {
 354         DSSDBG("init_display\n");
 355
 356         if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
 357                 struct regulator *vdds_dsi;
 358
 359                 vdds_dsi = dss_get_vdds_dsi();
 360
 361                 if (IS_ERR(vdds_dsi)) {
 362                         DSSERR("can't get VDDS_DSI regulator\n");
 363                         return PTR_ERR(vdds_dsi);
 364                 }
 365
 366                 dpi.vdds_dsi_reg = vdds_dsi;
 367         }
 368
 369         if (dpi_use_dsi_pll(dssdev)) {
 370                 enum omap_dss_clk_source dispc_fclk_src =
 371                         dssdev->clocks.dispc.dispc_fclk_src;
 372                 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
 373         }
 374
 375         return 0;
 376 }
 377
 378 int dpi_init(void)
 379 {
 380         return 0;
 381 }
 382
 383 void dpi_exit(void)
 384 {
 385 }
 386