drivers/video/omap2/dss/sdi.c

   1 /*
   2  * linux/drivers/video/omap2/dss/sdi.c
   3  *
   4  * Copyright (C) 2009 Nokia Corporation
   5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #define DSS_SUBSYS_NAME "SDI"
  21
  22 #include <linux/kernel.h>
  23 #include <linux/delay.h>
  24 #include <linux/err.h>
  25 #include <linux/regulator/consumer.h>
  26 #include <linux/export.h>
  27
  28 #include <video/omapdss.h>
  29 #include "dss.h"
  30
  31 static struct {
  32         bool update_enabled;
  33         struct regulator *vdds_sdi_reg;
  34 } sdi;
  35
  36 static void sdi_basic_init(struct omap_dss_device *dssdev)
  37
  38 {
  39         dispc_set_parallel_interface_mode(dssdev->manager->id,
  40                         OMAP_DSS_PARALLELMODE_BYPASS);
  41
  42         dispc_set_lcd_display_type(dssdev->manager->id,
  43                         OMAP_DSS_LCD_DISPLAY_TFT);
  44
  45         dispc_set_tft_data_lines(dssdev->manager->id, 24);
  46         dispc_lcd_enable_signal_polarity(1);
  47 }
  48
  49 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
  50 {
  51         struct omap_video_timings *t = &dssdev->panel.timings;
  52         struct dss_clock_info dss_cinfo;
  53         struct dispc_clock_info dispc_cinfo;
  54         u16 lck_div, pck_div;
  55         unsigned long fck;
  56         unsigned long pck;
  57         int r;
  58
  59         r = omap_dss_start_device(dssdev);
  60         if (r) {
  61                 DSSERR("failed to start device\n");
  62                 goto err_start_dev;
  63         }
  64
  65         r = regulator_enable(sdi.vdds_sdi_reg);
  66         if (r)
  67                 goto err_reg_enable;
  68
  69         r = dss_runtime_get();
  70         if (r)
  71                 goto err_get_dss;
  72
  73         r = dispc_runtime_get();
  74         if (r)
  75                 goto err_get_dispc;
  76
  77         sdi_basic_init(dssdev);
  78
  79         /* 15.5.9.1.2 */
  80         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  81
  82         dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  83                         dssdev->panel.acbi, dssdev->panel.acb);
  84
  85         r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  86                         &dss_cinfo, &dispc_cinfo);
  87         if (r)
  88                 goto err_calc_clock_div;
  89
  90         fck = dss_cinfo.fck;
  91         lck_div = dispc_cinfo.lck_div;
  92         pck_div = dispc_cinfo.pck_div;
  93
  94         pck = fck / lck_div / pck_div / 1000;
  95
  96         if (pck != t->pixel_clock) {
  97                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
  98                                 "got %lu kHz\n",
  99                                 t->pixel_clock, pck);
 100
 101                 t->pixel_clock = pck;
 102         }
 103
 104
 105         dispc_set_lcd_timings(dssdev->manager->id, t);
 106
 107         r = dss_set_clock_div(&dss_cinfo);
 108         if (r)
 109                 goto err_set_dss_clock_div;
 110
 111         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 112         if (r)
 113                 goto err_set_dispc_clock_div;
 114
 115         dss_sdi_init(dssdev->phy.sdi.datapairs);
 116         r = dss_sdi_enable();
 117         if (r)
 118                 goto err_sdi_enable;
 119         mdelay(2);
 120
 121         dssdev->manager->enable(dssdev->manager);
 122
 123         return 0;
 124
 125 err_sdi_enable:
 126 err_set_dispc_clock_div:
 127 err_set_dss_clock_div:
 128 err_calc_clock_div:
 129         dispc_runtime_put();
 130 err_get_dispc:
 131         dss_runtime_put();
 132 err_get_dss:
 133         regulator_disable(sdi.vdds_sdi_reg);
 134 err_reg_enable:
 135         omap_dss_stop_device(dssdev);
 136 err_start_dev:
 137         return r;
 138 }
 139 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 140
 141 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 142 {
 143         dssdev->manager->disable(dssdev->manager);
 144
 145         dss_sdi_disable();
 146
 147         dispc_runtime_put();
 148         dss_runtime_put();
 149
 150         regulator_disable(sdi.vdds_sdi_reg);
 151
 152         omap_dss_stop_device(dssdev);
 153 }
 154 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 155
 156 int sdi_init_display(struct omap_dss_device *dssdev)
 157 {
 158         DSSDBG("SDI init\n");
 159
 160         if (sdi.vdds_sdi_reg == NULL) {
 161                 struct regulator *vdds_sdi;
 162
 163                 vdds_sdi = dss_get_vdds_sdi();
 164
 165                 if (IS_ERR(vdds_sdi)) {
 166                         DSSERR("can't get VDDS_SDI regulator\n");
 167                         return PTR_ERR(vdds_sdi);
 168                 }
 169
 170                 sdi.vdds_sdi_reg = vdds_sdi;
 171         }
 172
 173         return 0;
 174 }
 175
 176 int sdi_init(void)
 177 {
 178         return 0;
 179 }
 180
 181 void sdi_exit(void)
 182 {
 183 }