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
  27 #include <video/omapdss.h>
  28 #include "dss.h"
  29
  30 static struct {
  31         bool update_enabled;
  32         struct regulator *vdds_sdi_reg;
  33 } sdi;
  34
  35 static void sdi_basic_init(struct omap_dss_device *dssdev)
  36
  37 {
  38         dispc_set_parallel_interface_mode(dssdev->manager->id,
  39                         OMAP_DSS_PARALLELMODE_BYPASS);
  40
  41         dispc_set_lcd_display_type(dssdev->manager->id,
  42                         OMAP_DSS_LCD_DISPLAY_TFT);
  43
  44         dispc_set_tft_data_lines(dssdev->manager->id, 24);
  45         dispc_lcd_enable_signal_polarity(1);
  46 }
  47
  48 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
  49 {
  50         struct omap_video_timings *t = &dssdev->panel.timings;
  51         struct dss_clock_info dss_cinfo;
  52         struct dispc_clock_info dispc_cinfo;
  53         u16 lck_div, pck_div;
  54         unsigned long fck;
  55         unsigned long pck;
  56         int r;
  57
  58         if (dssdev->manager == NULL) {
  59                 DSSERR("failed to enable display: no manager\n");
  60                 return -ENODEV;
  61         }
  62
  63         r = omap_dss_start_device(dssdev);
  64         if (r) {
  65                 DSSERR("failed to start device\n");
  66                 goto err_start_dev;
  67         }
  68
  69         r = regulator_enable(sdi.vdds_sdi_reg);
  70         if (r)
  71                 goto err_reg_enable;
  72
  73         r = dss_runtime_get();
  74         if (r)
  75                 goto err_get_dss;
  76
  77         r = dispc_runtime_get();
  78         if (r)
  79                 goto err_get_dispc;
  80
  81         sdi_basic_init(dssdev);
  82
  83         /* 15.5.9.1.2 */
  84         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  85
  86         dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  87                         dssdev->panel.acbi, dssdev->panel.acb);
  88
  89         r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  90                         &dss_cinfo, &dispc_cinfo);
  91         if (r)
  92                 goto err_calc_clock_div;
  93
  94         fck = dss_cinfo.fck;
  95         lck_div = dispc_cinfo.lck_div;
  96         pck_div = dispc_cinfo.pck_div;
  97
  98         pck = fck / lck_div / pck_div / 1000;
  99
 100         if (pck != t->pixel_clock) {
 101                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
 102                                 "got %lu kHz\n",
 103                                 t->pixel_clock, pck);
 104
 105                 t->pixel_clock = pck;
 106         }
 107
 108
 109         dispc_set_lcd_timings(dssdev->manager->id, t);
 110
 111         r = dss_set_clock_div(&dss_cinfo);
 112         if (r)
 113                 goto err_set_dss_clock_div;
 114
 115         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 116         if (r)
 117                 goto err_set_dispc_clock_div;
 118
 119         dss_sdi_init(dssdev->phy.sdi.datapairs);
 120         r = dss_sdi_enable();
 121         if (r)
 122                 goto err_sdi_enable;
 123         mdelay(2);
 124
 125         dssdev->manager->enable(dssdev->manager);
 126
 127         return 0;
 128
 129 err_sdi_enable:
 130 err_set_dispc_clock_div:
 131 err_set_dss_clock_div:
 132 err_calc_clock_div:
 133         dispc_runtime_put();
 134 err_get_dispc:
 135         dss_runtime_put();
 136 err_get_dss:
 137         regulator_disable(sdi.vdds_sdi_reg);
 138 err_reg_enable:
 139         omap_dss_stop_device(dssdev);
 140 err_start_dev:
 141         return r;
 142 }
 143 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 144
 145 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 146 {
 147         dssdev->manager->disable(dssdev->manager);
 148
 149         dss_sdi_disable();
 150
 151         dispc_runtime_put();
 152         dss_runtime_put();
 153
 154         regulator_disable(sdi.vdds_sdi_reg);
 155
 156         omap_dss_stop_device(dssdev);
 157 }
 158 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 159
 160 int sdi_init_display(struct omap_dss_device *dssdev)
 161 {
 162         DSSDBG("SDI init\n");
 163
 164         if (sdi.vdds_sdi_reg == NULL) {
 165                 struct regulator *vdds_sdi;
 166
 167                 vdds_sdi = dss_get_vdds_sdi();
 168
 169                 if (IS_ERR(vdds_sdi)) {
 170                         DSSERR("can't get VDDS_SDI regulator\n");
 171                         return PTR_ERR(vdds_sdi);
 172                 }
 173
 174                 sdi.vdds_sdi_reg = vdds_sdi;
 175         }
 176
 177         return 0;
 178 }
 179
 180 int sdi_init(void)
 181 {
 182         return 0;
 183 }
 184
 185 void sdi_exit(void)
 186 {
 187 }