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
  36         struct dss_lcd_mgr_config mgr_config;
  37 } sdi;
  38
  39 static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
  40 {
  41         sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
  42
  43         sdi.mgr_config.stallmode = false;
  44         sdi.mgr_config.fifohandcheck = false;
  45
  46         sdi.mgr_config.video_port_width = 24;
  47         sdi.mgr_config.lcden_sig_polarity = 1;
  48
  49         dss_mgr_set_lcd_config(dssdev->manager, &sdi.mgr_config);
  50 }
  51
  52 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
  53 {
  54         struct omap_video_timings *t = &dssdev->panel.timings;
  55         struct dss_clock_info dss_cinfo;
  56         struct dispc_clock_info dispc_cinfo;
  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         /* 15.5.9.1.2 */
  80         dssdev->panel.timings.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
  81         dssdev->panel.timings.sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
  82
  83         r = dss_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
  84         if (r)
  85                 goto err_calc_clock_div;
  86
  87         sdi.mgr_config.clock_info = dispc_cinfo;
  88
  89         pck = dss_cinfo.fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div / 1000;
  90
  91         if (pck != t->pixel_clock) {
  92                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
  93                                 "got %lu kHz\n",
  94                                 t->pixel_clock, pck);
  95
  96                 t->pixel_clock = pck;
  97         }
  98
  99
 100         dss_mgr_set_timings(dssdev->manager, t);
 101
 102         r = dss_set_clock_div(&dss_cinfo);
 103         if (r)
 104                 goto err_set_dss_clock_div;
 105
 106         sdi_config_lcd_manager(dssdev);
 107
 108         dss_sdi_init(dssdev->phy.sdi.datapairs);
 109         r = dss_sdi_enable();
 110         if (r)
 111                 goto err_sdi_enable;
 112         mdelay(2);
 113
 114         r = dss_mgr_enable(dssdev->manager);
 115         if (r)
 116                 goto err_mgr_enable;
 117
 118         return 0;
 119
 120 err_mgr_enable:
 121         dss_sdi_disable();
 122 err_sdi_enable:
 123 err_set_dss_clock_div:
 124 err_calc_clock_div:
 125         dispc_runtime_put();
 126 err_get_dispc:
 127         regulator_disable(sdi.vdds_sdi_reg);
 128 err_reg_enable:
 129         omap_dss_stop_device(dssdev);
 130 err_start_dev:
 131         return r;
 132 }
 133 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 134
 135 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 136 {
 137         dss_mgr_disable(dssdev->manager);
 138
 139         dss_sdi_disable();
 140
 141         dispc_runtime_put();
 142
 143         regulator_disable(sdi.vdds_sdi_reg);
 144
 145         omap_dss_stop_device(dssdev);
 146 }
 147 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 148
 149 static int __init sdi_init_display(struct omap_dss_device *dssdev)
 150 {
 151         DSSDBG("SDI init\n");
 152
 153         if (sdi.vdds_sdi_reg == NULL) {
 154                 struct regulator *vdds_sdi;
 155
 156                 vdds_sdi = dss_get_vdds_sdi();
 157
 158                 if (IS_ERR(vdds_sdi)) {
 159                         DSSERR("can't get VDDS_SDI regulator\n");
 160                         return PTR_ERR(vdds_sdi);
 161                 }
 162
 163                 sdi.vdds_sdi_reg = vdds_sdi;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static void __init sdi_probe_pdata(struct platform_device *pdev)
 170 {
 171         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
 172         int i, r;
 173
 174         for (i = 0; i < pdata->num_devices; ++i) {
 175                 struct omap_dss_device *dssdev = pdata->devices[i];
 176
 177                 if (dssdev->type != OMAP_DISPLAY_TYPE_SDI)
 178                         continue;
 179
 180                 r = sdi_init_display(dssdev);
 181                 if (r) {
 182                         DSSERR("device %s init failed: %d\n", dssdev->name, r);
 183                         continue;
 184                 }
 185
 186                 r = omap_dss_register_device(dssdev, &pdev->dev, i);
 187                 if (r)
 188                         DSSERR("device %s register failed: %d\n",
 189                                         dssdev->name, r);
 190         }
 191 }
 192
 193 static int __init omap_sdi_probe(struct platform_device *pdev)
 194 {
 195         sdi_probe_pdata(pdev);
 196
 197         return 0;
 198 }
 199
 200 static int __exit omap_sdi_remove(struct platform_device *pdev)
 201 {
 202         omap_dss_unregister_child_devices(&pdev->dev);
 203
 204         return 0;
 205 }
 206
 207 static struct platform_driver omap_sdi_driver = {
 208         .remove         = __exit_p(omap_sdi_remove),
 209         .driver         = {
 210                 .name   = "omapdss_sdi",
 211                 .owner  = THIS_MODULE,
 212         },
 213 };
 214
 215 int __init sdi_init_platform_driver(void)
 216 {
 217         return platform_driver_probe(&omap_sdi_driver, omap_sdi_probe);
 218 }
 219
 220 void __exit sdi_uninit_platform_driver(void)
 221 {
 222         platform_driver_unregister(&omap_sdi_driver);
 223 }