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 #include <linux/platform_device.h>
  28
  29 #include <video/omapdss.h>
  30 #include "dss.h"
  31
  32 static struct {
  33         bool update_enabled;
  34         struct regulator *vdds_sdi_reg;
  35 } sdi;
  36
  37 static void sdi_basic_init(struct omap_dss_device *dssdev)
  38
  39 {
  40         dispc_mgr_set_io_pad_mode(DSS_IO_PAD_MODE_BYPASS);
  41         dispc_mgr_enable_stallmode(dssdev->manager->id, false);
  42
  43         dispc_mgr_set_lcd_display_type(dssdev->manager->id,
  44                         OMAP_DSS_LCD_DISPLAY_TFT);
  45
  46         dispc_mgr_set_tft_data_lines(dssdev->manager->id, 24);
  47         dispc_lcd_enable_signal_polarity(1);
  48 }
  49
  50 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
  51 {
  52         struct omap_video_timings *t = &dssdev->panel.timings;
  53         struct dss_clock_info dss_cinfo;
  54         struct dispc_clock_info dispc_cinfo;
  55         u16 lck_div, pck_div;
  56         unsigned long fck;
  57         unsigned long pck;
  58         int r;
  59
  60         if (dssdev->manager == NULL) {
  61                 DSSERR("failed to enable display: no manager\n");
  62                 return -ENODEV;
  63         }
  64
  65         r = omap_dss_start_device(dssdev);
  66         if (r) {
  67                 DSSERR("failed to start device\n");
  68                 goto err_start_dev;
  69         }
  70
  71         r = regulator_enable(sdi.vdds_sdi_reg);
  72         if (r)
  73                 goto err_reg_enable;
  74
  75         r = dispc_runtime_get();
  76         if (r)
  77                 goto err_get_dispc;
  78
  79         sdi_basic_init(dssdev);
  80
  81         /* 15.5.9.1.2 */
  82         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  83
  84         dispc_mgr_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  85                         dssdev->panel.acbi, dssdev->panel.acb);
  86
  87         r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  88                         &dss_cinfo, &dispc_cinfo);
  89         if (r)
  90                 goto err_calc_clock_div;
  91
  92         fck = dss_cinfo.fck;
  93         lck_div = dispc_cinfo.lck_div;
  94         pck_div = dispc_cinfo.pck_div;
  95
  96         pck = fck / lck_div / pck_div / 1000;
  97
  98         if (pck != t->pixel_clock) {
  99                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
 100                                 "got %lu kHz\n",
 101                                 t->pixel_clock, pck);
 102
 103                 t->pixel_clock = pck;
 104         }
 105
 106
 107         dss_mgr_set_timings(dssdev->manager, t);
 108
 109         r = dss_set_clock_div(&dss_cinfo);
 110         if (r)
 111                 goto err_set_dss_clock_div;
 112
 113         r = dispc_mgr_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 114         if (r)
 115                 goto err_set_dispc_clock_div;
 116
 117         dss_sdi_init(dssdev->phy.sdi.datapairs);
 118         r = dss_sdi_enable();
 119         if (r)
 120                 goto err_sdi_enable;
 121         mdelay(2);
 122
 123         r = dss_mgr_enable(dssdev->manager);
 124         if (r)
 125                 goto err_mgr_enable;
 126
 127         return 0;
 128
 129 err_mgr_enable:
 130         dss_sdi_disable();
 131 err_sdi_enable:
 132 err_set_dispc_clock_div:
 133 err_set_dss_clock_div:
 134 err_calc_clock_div:
 135         dispc_runtime_put();
 136 err_get_dispc:
 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         dss_mgr_disable(dssdev->manager);
 148
 149         dss_sdi_disable();
 150
 151         dispc_runtime_put();
 152
 153         regulator_disable(sdi.vdds_sdi_reg);
 154
 155         omap_dss_stop_device(dssdev);
 156 }
 157 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 158
 159 int sdi_init_display(struct omap_dss_device *dssdev)
 160 {
 161         DSSDBG("SDI init\n");
 162
 163         if (sdi.vdds_sdi_reg == NULL) {
 164                 struct regulator *vdds_sdi;
 165
 166                 vdds_sdi = dss_get_vdds_sdi();
 167
 168                 if (IS_ERR(vdds_sdi)) {
 169                         DSSERR("can't get VDDS_SDI regulator\n");
 170                         return PTR_ERR(vdds_sdi);
 171                 }
 172
 173                 sdi.vdds_sdi_reg = vdds_sdi;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int __init omap_sdi_probe(struct platform_device *pdev)
 180 {
 181         return 0;
 182 }
 183
 184 static int __exit omap_sdi_remove(struct platform_device *pdev)
 185 {
 186         return 0;
 187 }
 188
 189 static struct platform_driver omap_sdi_driver = {
 190         .remove         = __exit_p(omap_sdi_remove),
 191         .driver         = {
 192                 .name   = "omapdss_sdi",
 193                 .owner  = THIS_MODULE,
 194         },
 195 };
 196
 197 int __init sdi_init_platform_driver(void)
 198 {
 199         return platform_driver_probe(&omap_sdi_driver, omap_sdi_probe);
 200 }
 201
 202 void __exit sdi_uninit_platform_driver(void)
 203 {
 204         platform_driver_unregister(&omap_sdi_driver);
 205 }