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/clk.h>
  24 #include <linux/delay.h>
  25 #include <linux/err.h>
  26 #include <linux/regulator/consumer.h>
  27
  28 #include <video/omapdss.h>
  29 #include <plat/cpu.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_set_parallel_interface_mode(dssdev->manager->id,
  41                         OMAP_DSS_PARALLELMODE_BYPASS);
  42
  43         dispc_set_lcd_display_type(dssdev->manager->id,
  44                         OMAP_DSS_LCD_DISPLAY_TFT);
  45
  46         dispc_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         r = omap_dss_start_device(dssdev);
  61         if (r) {
  62                 DSSERR("failed to start device\n");
  63                 goto err0;
  64         }
  65
  66         r = regulator_enable(sdi.vdds_sdi_reg);
  67         if (r)
  68                 goto err1;
  69
  70         dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
  71
  72         sdi_basic_init(dssdev);
  73
  74         /* 15.5.9.1.2 */
  75         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  76
  77         dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  78                         dssdev->panel.acbi, dssdev->panel.acb);
  79
  80         r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  81                         &dss_cinfo, &dispc_cinfo);
  82         if (r)
  83                 goto err2;
  84
  85         fck = dss_cinfo.fck;
  86         lck_div = dispc_cinfo.lck_div;
  87         pck_div = dispc_cinfo.pck_div;
  88
  89         pck = fck / lck_div / 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         dispc_set_lcd_timings(dssdev->manager->id, t);
 101
 102         r = dss_set_clock_div(&dss_cinfo);
 103         if (r)
 104                 goto err2;
 105
 106         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 107         if (r)
 108                 goto err2;
 109
 110         dss_sdi_init(dssdev->phy.sdi.datapairs);
 111         r = dss_sdi_enable();
 112         if (r)
 113                 goto err1;
 114         mdelay(2);
 115
 116         dssdev->manager->enable(dssdev->manager);
 117
 118         return 0;
 119 err2:
 120         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 121         regulator_disable(sdi.vdds_sdi_reg);
 122 err1:
 123         omap_dss_stop_device(dssdev);
 124 err0:
 125         return r;
 126 }
 127 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 128
 129 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 130 {
 131         dssdev->manager->disable(dssdev->manager);
 132
 133         dss_sdi_disable();
 134
 135         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
 136
 137         regulator_disable(sdi.vdds_sdi_reg);
 138
 139         omap_dss_stop_device(dssdev);
 140 }
 141 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 142
 143 int sdi_init_display(struct omap_dss_device *dssdev)
 144 {
 145         DSSDBG("SDI init\n");
 146
 147         if (sdi.vdds_sdi_reg == NULL) {
 148                 struct regulator *vdds_sdi;
 149
 150                 vdds_sdi = dss_get_vdds_sdi();
 151
 152                 if (IS_ERR(vdds_sdi)) {
 153                         DSSERR("can't get VDDS_SDI regulator\n");
 154                         return PTR_ERR(vdds_sdi);
 155                 }
 156
 157                 sdi.vdds_sdi_reg = vdds_sdi;
 158         }
 159
 160         return 0;
 161 }
 162
 163 int sdi_init(void)
 164 {
 165         return 0;
 166 }
 167
 168 void sdi_exit(void)
 169 {
 170 }