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_mgr_set_io_pad_mode(DSS_IO_PAD_MODE_BYPASS);
  40         dispc_mgr_enable_stallmode(dssdev->manager->id, false);
  41
  42         dispc_mgr_set_lcd_display_type(dssdev->manager->id,
  43                         OMAP_DSS_LCD_DISPLAY_TFT);
  44
  45         dispc_mgr_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         if (dssdev->manager == NULL) {
  60                 DSSERR("failed to enable display: no manager\n");
  61                 return -ENODEV;
  62         }
  63
  64         r = omap_dss_start_device(dssdev);
  65         if (r) {
  66                 DSSERR("failed to start device\n");
  67                 goto err_start_dev;
  68         }
  69
  70         r = regulator_enable(sdi.vdds_sdi_reg);
  71         if (r)
  72                 goto err_reg_enable;
  73
  74         r = dss_runtime_get();
  75         if (r)
  76                 goto err_get_dss;
  77
  78         r = dispc_runtime_get();
  79         if (r)
  80                 goto err_get_dispc;
  81
  82         sdi_basic_init(dssdev);
  83
  84         /* 15.5.9.1.2 */
  85         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  86
  87         dispc_mgr_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  88                         dssdev->panel.acbi, dssdev->panel.acb);
  89
  90         r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  91                         &dss_cinfo, &dispc_cinfo);
  92         if (r)
  93                 goto err_calc_clock_div;
  94
  95         fck = dss_cinfo.fck;
  96         lck_div = dispc_cinfo.lck_div;
  97         pck_div = dispc_cinfo.pck_div;
  98
  99         pck = fck / lck_div / pck_div / 1000;
 100
 101         if (pck != t->pixel_clock) {
 102                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
 103                                 "got %lu kHz\n",
 104                                 t->pixel_clock, pck);
 105
 106                 t->pixel_clock = pck;
 107         }
 108
 109
 110         dispc_mgr_set_lcd_timings(dssdev->manager->id, t);
 111
 112         r = dss_set_clock_div(&dss_cinfo);
 113         if (r)
 114                 goto err_set_dss_clock_div;
 115
 116         r = dispc_mgr_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 117         if (r)
 118                 goto err_set_dispc_clock_div;
 119
 120         dss_sdi_init(dssdev->phy.sdi.datapairs);
 121         r = dss_sdi_enable();
 122         if (r)
 123                 goto err_sdi_enable;
 124         mdelay(2);
 125
 126         r = dss_mgr_enable(dssdev->manager);
 127         if (r)
 128                 goto err_mgr_enable;
 129
 130         return 0;
 131
 132 err_mgr_enable:
 133         dss_sdi_disable();
 134 err_sdi_enable:
 135 err_set_dispc_clock_div:
 136 err_set_dss_clock_div:
 137 err_calc_clock_div:
 138         dispc_runtime_put();
 139 err_get_dispc:
 140         dss_runtime_put();
 141 err_get_dss:
 142         regulator_disable(sdi.vdds_sdi_reg);
 143 err_reg_enable:
 144         omap_dss_stop_device(dssdev);
 145 err_start_dev:
 146         return r;
 147 }
 148 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 149
 150 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 151 {
 152         dss_mgr_disable(dssdev->manager);
 153
 154         dss_sdi_disable();
 155
 156         dispc_runtime_put();
 157         dss_runtime_put();
 158
 159         regulator_disable(sdi.vdds_sdi_reg);
 160
 161         omap_dss_stop_device(dssdev);
 162 }
 163 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 164
 165 int sdi_init_display(struct omap_dss_device *dssdev)
 166 {
 167         DSSDBG("SDI init\n");
 168
 169         if (sdi.vdds_sdi_reg == NULL) {
 170                 struct regulator *vdds_sdi;
 171
 172                 vdds_sdi = dss_get_vdds_sdi();
 173
 174                 if (IS_ERR(vdds_sdi)) {
 175                         DSSERR("can't get VDDS_SDI regulator\n");
 176                         return PTR_ERR(vdds_sdi);
 177                 }
 178
 179                 sdi.vdds_sdi_reg = vdds_sdi;
 180         }
 181
 182         return 0;
 183 }
 184
 185 int sdi_init(void)
 186 {
 187         return 0;
 188 }
 189
 190 void sdi_exit(void)
 191 {
 192 }