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         r = omap_dss_start_device(dssdev);
  59         if (r) {
  60                 DSSERR("failed to start device\n");
  61                 goto err_start_dev;
  62         }
  63
  64         r = regulator_enable(sdi.vdds_sdi_reg);
  65         if (r)
  66                 goto err_reg_enable;
  67
  68         r = dss_runtime_get();
  69         if (r)
  70                 goto err_get_dss;
  71
  72         r = dispc_runtime_get();
  73         if (r)
  74                 goto err_get_dispc;
  75
  76         sdi_basic_init(dssdev);
  77
  78         /* 15.5.9.1.2 */
  79         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  80
  81         dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  82                         dssdev->panel.acbi, dssdev->panel.acb);
  83
  84         r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  85                         &dss_cinfo, &dispc_cinfo);
  86         if (r)
  87                 goto err_calc_clock_div;
  88
  89         fck = dss_cinfo.fck;
  90         lck_div = dispc_cinfo.lck_div;
  91         pck_div = dispc_cinfo.pck_div;
  92
  93         pck = fck / lck_div / pck_div / 1000;
  94
  95         if (pck != t->pixel_clock) {
  96                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
  97                                 "got %lu kHz\n",
  98                                 t->pixel_clock, pck);
  99
 100                 t->pixel_clock = pck;
 101         }
 102
 103
 104         dispc_set_lcd_timings(dssdev->manager->id, t);
 105
 106         r = dss_set_clock_div(&dss_cinfo);
 107         if (r)
 108                 goto err_set_dss_clock_div;
 109
 110         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 111         if (r)
 112                 goto err_set_dispc_clock_div;
 113
 114         dss_sdi_init(dssdev->phy.sdi.datapairs);
 115         r = dss_sdi_enable();
 116         if (r)
 117                 goto err_sdi_enable;
 118         mdelay(2);
 119
 120         dssdev->manager->enable(dssdev->manager);
 121
 122         return 0;
 123
 124 err_sdi_enable:
 125 err_set_dispc_clock_div:
 126 err_set_dss_clock_div:
 127 err_calc_clock_div:
 128         dispc_runtime_put();
 129 err_get_dispc:
 130         dss_runtime_put();
 131 err_get_dss:
 132         regulator_disable(sdi.vdds_sdi_reg);
 133 err_reg_enable:
 134         omap_dss_stop_device(dssdev);
 135 err_start_dev:
 136         return r;
 137 }
 138 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 139
 140 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 141 {
 142         dssdev->manager->disable(dssdev->manager);
 143
 144         dss_sdi_disable();
 145
 146         dispc_runtime_put();
 147         dss_runtime_put();
 148
 149         regulator_disable(sdi.vdds_sdi_reg);
 150
 151         omap_dss_stop_device(dssdev);
 152 }
 153 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 154
 155 int sdi_init_display(struct omap_dss_device *dssdev)
 156 {
 157         DSSDBG("SDI init\n");
 158
 159         if (sdi.vdds_sdi_reg == NULL) {
 160                 struct regulator *vdds_sdi;
 161
 162                 vdds_sdi = dss_get_vdds_sdi();
 163
 164                 if (IS_ERR(vdds_sdi)) {
 165                         DSSERR("can't get VDDS_SDI regulator\n");
 166                         return PTR_ERR(vdds_sdi);
 167                 }
 168
 169                 sdi.vdds_sdi_reg = vdds_sdi;
 170         }
 171
 172         return 0;
 173 }
 174
 175 int sdi_init(void)
 176 {
 177         return 0;
 178 }
 179
 180 void sdi_exit(void)
 181 {
 182 }