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/clk.h>
  27 #include <linux/delay.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 <plat/display.h>
  34 #include <plat/cpu.h>
  35
  36 #include "dss.h"
  37
  38 static struct {
  39         struct regulator *vdds_dsi_reg;
  40 } dpi;
  41
  42 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
  43 static int dpi_set_dsi_clk(bool is_tft, unsigned long pck_req,
  44                 unsigned long *fck, int *lck_div, int *pck_div)
  45 {
  46         struct dsi_clock_info dsi_cinfo;
  47         struct dispc_clock_info dispc_cinfo;
  48         int r;
  49
  50         r = dsi_pll_calc_clock_div_pck(is_tft, pck_req, &dsi_cinfo,
  51                         &dispc_cinfo);
  52         if (r)
  53                 return r;
  54
  55         r = dsi_pll_set_clock_div(&dsi_cinfo);
  56         if (r)
  57                 return r;
  58
  59         dss_select_dispc_clk_source(DSS_SRC_DSI1_PLL_FCLK);
  60
  61         r = dispc_set_clock_div(&dispc_cinfo);
  62         if (r)
  63                 return r;
  64
  65         *fck = dsi_cinfo.dsi1_pll_fclk;
  66         *lck_div = dispc_cinfo.lck_div;
  67         *pck_div = dispc_cinfo.pck_div;
  68
  69         return 0;
  70 }
  71 #else
  72 static int dpi_set_dispc_clk(bool is_tft, unsigned long pck_req,
  73                 unsigned long *fck, int *lck_div, int *pck_div)
  74 {
  75         struct dss_clock_info dss_cinfo;
  76         struct dispc_clock_info dispc_cinfo;
  77         int r;
  78
  79         r = dss_calc_clock_div(is_tft, pck_req, &dss_cinfo, &dispc_cinfo);
  80         if (r)
  81                 return r;
  82
  83         r = dss_set_clock_div(&dss_cinfo);
  84         if (r)
  85                 return r;
  86
  87         r = dispc_set_clock_div(&dispc_cinfo);
  88         if (r)
  89                 return r;
  90
  91         *fck = dss_cinfo.fck;
  92         *lck_div = dispc_cinfo.lck_div;
  93         *pck_div = dispc_cinfo.pck_div;
  94
  95         return 0;
  96 }
  97 #endif
  98
  99 static int dpi_set_mode(struct omap_dss_device *dssdev)
 100 {
 101         struct omap_video_timings *t = &dssdev->panel.timings;
 102         int lck_div, pck_div;
 103         unsigned long fck;
 104         unsigned long pck;
 105         bool is_tft;
 106         int r = 0;
 107
 108         dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
 109
 110         dispc_set_pol_freq(dssdev->panel.config, dssdev->panel.acbi,
 111                         dssdev->panel.acb);
 112
 113         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 114
 115 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 116         r = dpi_set_dsi_clk(is_tft, t->pixel_clock * 1000,
 117                         &fck, &lck_div, &pck_div);
 118 #else
 119         r = dpi_set_dispc_clk(is_tft, t->pixel_clock * 1000,
 120                         &fck, &lck_div, &pck_div);
 121 #endif
 122         if (r)
 123                 goto err0;
 124
 125         pck = fck / lck_div / pck_div / 1000;
 126
 127         if (pck != t->pixel_clock) {
 128                 DSSWARN("Could not find exact pixel clock. "
 129                                 "Requested %d kHz, got %lu kHz\n",
 130                                 t->pixel_clock, pck);
 131
 132                 t->pixel_clock = pck;
 133         }
 134
 135         dispc_set_lcd_timings(t);
 136
 137 err0:
 138         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 139         return r;
 140 }
 141
 142 static int dpi_basic_init(struct omap_dss_device *dssdev)
 143 {
 144         bool is_tft;
 145
 146         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 147
 148         dispc_set_parallel_interface_mode(OMAP_DSS_PARALLELMODE_BYPASS);
 149         dispc_set_lcd_display_type(is_tft ? OMAP_DSS_LCD_DISPLAY_TFT :
 150                         OMAP_DSS_LCD_DISPLAY_STN);
 151         dispc_set_tft_data_lines(dssdev->phy.dpi.data_lines);
 152
 153         return 0;
 154 }
 155
 156 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
 157 {
 158         int r;
 159
 160         r = omap_dss_start_device(dssdev);
 161         if (r) {
 162                 DSSERR("failed to start device\n");
 163                 goto err0;
 164         }
 165
 166         if (cpu_is_omap34xx()) {
 167                 r = regulator_enable(dpi.vdds_dsi_reg);
 168                 if (r)
 169                         goto err1;
 170         }
 171
 172         dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
 173
 174         r = dpi_basic_init(dssdev);
 175         if (r)
 176                 goto err2;
 177
 178 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 179         dss_clk_enable(DSS_CLK_FCK2);
 180         r = dsi_pll_init(dssdev, 0, 1);
 181         if (r)
 182                 goto err3;
 183 #endif
 184         r = dpi_set_mode(dssdev);
 185         if (r)
 186                 goto err4;
 187
 188         mdelay(2);
 189
 190         dssdev->manager->enable(dssdev->manager);
 191
 192         return 0;
 193
 194 err4:
 195 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 196         dsi_pll_uninit();
 197 err3:
 198         dss_clk_disable(DSS_CLK_FCK2);
 199 #endif
 200 err2:
 201         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 202         if (cpu_is_omap34xx())
 203                 regulator_disable(dpi.vdds_dsi_reg);
 204 err1:
 205         omap_dss_stop_device(dssdev);
 206 err0:
 207         return r;
 208 }
 209 EXPORT_SYMBOL(omapdss_dpi_display_enable);
 210
 211 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
 212 {
 213         dssdev->manager->disable(dssdev->manager);
 214
 215 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 216         dss_select_dispc_clk_source(DSS_SRC_DSS1_ALWON_FCLK);
 217         dsi_pll_uninit();
 218         dss_clk_disable(DSS_CLK_FCK2);
 219 #endif
 220
 221         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 222
 223         if (cpu_is_omap34xx())
 224                 regulator_disable(dpi.vdds_dsi_reg);
 225
 226         omap_dss_stop_device(dssdev);
 227 }
 228 EXPORT_SYMBOL(omapdss_dpi_display_disable);
 229
 230 void dpi_set_timings(struct omap_dss_device *dssdev,
 231                         struct omap_video_timings *timings)
 232 {
 233         DSSDBG("dpi_set_timings\n");
 234         dssdev->panel.timings = *timings;
 235         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
 236                 dpi_set_mode(dssdev);
 237                 dispc_go(OMAP_DSS_CHANNEL_LCD);
 238         }
 239 }
 240 EXPORT_SYMBOL(dpi_set_timings);
 241
 242 int dpi_check_timings(struct omap_dss_device *dssdev,
 243                         struct omap_video_timings *timings)
 244 {
 245         bool is_tft;
 246         int r;
 247         int lck_div, pck_div;
 248         unsigned long fck;
 249         unsigned long pck;
 250
 251         if (!dispc_lcd_timings_ok(timings))
 252                 return -EINVAL;
 253
 254         if (timings->pixel_clock == 0)
 255                 return -EINVAL;
 256
 257         is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
 258
 259 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
 260         {
 261                 struct dsi_clock_info dsi_cinfo;
 262                 struct dispc_clock_info dispc_cinfo;
 263                 r = dsi_pll_calc_clock_div_pck(is_tft,
 264                                 timings->pixel_clock * 1000,
 265                                 &dsi_cinfo, &dispc_cinfo);
 266
 267                 if (r)
 268                         return r;
 269
 270                 fck = dsi_cinfo.dsi1_pll_fclk;
 271                 lck_div = dispc_cinfo.lck_div;
 272                 pck_div = dispc_cinfo.pck_div;
 273         }
 274 #else
 275         {
 276                 struct dss_clock_info dss_cinfo;
 277                 struct dispc_clock_info dispc_cinfo;
 278                 r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,
 279                                 &dss_cinfo, &dispc_cinfo);
 280
 281                 if (r)
 282                         return r;
 283
 284                 fck = dss_cinfo.fck;
 285                 lck_div = dispc_cinfo.lck_div;
 286                 pck_div = dispc_cinfo.pck_div;
 287         }
 288 #endif
 289
 290         pck = fck / lck_div / pck_div / 1000;
 291
 292         timings->pixel_clock = pck;
 293
 294         return 0;
 295 }
 296 EXPORT_SYMBOL(dpi_check_timings);
 297
 298 int dpi_init_display(struct omap_dss_device *dssdev)
 299 {
 300         DSSDBG("init_display\n");
 301
 302         return 0;
 303 }
 304
 305 int dpi_init(struct platform_device *pdev)
 306 {
 307         if (cpu_is_omap34xx()) {
 308                 dpi.vdds_dsi_reg = dss_get_vdds_dsi();
 309                 if (IS_ERR(dpi.vdds_dsi_reg)) {
 310                         DSSERR("can't get VDDS_DSI regulator\n");
 311                         return PTR_ERR(dpi.vdds_dsi_reg);
 312                 }
 313         }
 314
 315         return 0;
 316 }
 317
 318 void dpi_exit(void)
 319 {
 320 }
 321