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 <plat/display.h>
  29 #include <plat/cpu.h>
  30 #include "dss.h"
  31
  32 static struct {
  33         bool skip_init;
  34         bool update_enabled;
  35         struct regulator *vdds_sdi_reg;
  36 } sdi;
  37
  38 static void sdi_basic_init(void)
  39 {
  40         dispc_set_parallel_interface_mode(OMAP_DSS_PARALLELMODE_BYPASS);
  41
  42         dispc_set_lcd_display_type(OMAP_DSS_LCD_DISPLAY_TFT);
  43         dispc_set_tft_data_lines(24);
  44         dispc_lcd_enable_signal_polarity(1);
  45 }
  46
  47 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
  48 {
  49         struct omap_video_timings *t = &dssdev->panel.timings;
  50         struct dss_clock_info dss_cinfo;
  51         struct dispc_clock_info dispc_cinfo;
  52         u16 lck_div, pck_div;
  53         unsigned long fck;
  54         unsigned long pck;
  55         int r;
  56
  57         r = omap_dss_start_device(dssdev);
  58         if (r) {
  59                 DSSERR("failed to start device\n");
  60                 goto err0;
  61         }
  62
  63         r = regulator_enable(sdi.vdds_sdi_reg);
  64         if (r)
  65                 goto err1;
  66
  67         /* In case of skip_init sdi_init has already enabled the clocks */
  68         if (!sdi.skip_init)
  69                 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
  70
  71         sdi_basic_init();
  72
  73         /* 15.5.9.1.2 */
  74         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  75
  76         dispc_set_pol_freq(dssdev->panel.config, dssdev->panel.acbi,
  77                         dssdev->panel.acb);
  78
  79         if (!sdi.skip_init) {
  80                 r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  81                                 &dss_cinfo, &dispc_cinfo);
  82         } else {
  83                 r = dss_get_clock_div(&dss_cinfo);
  84                 r = dispc_get_clock_div(&dispc_cinfo);
  85         }
  86
  87         if (r)
  88                 goto err2;
  89
  90         fck = dss_cinfo.fck;
  91         lck_div = dispc_cinfo.lck_div;
  92         pck_div = dispc_cinfo.pck_div;
  93
  94         pck = fck / lck_div / pck_div / 1000;
  95
  96         if (pck != t->pixel_clock) {
  97                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
  98                                 "got %lu kHz\n",
  99                                 t->pixel_clock, pck);
 100
 101                 t->pixel_clock = pck;
 102         }
 103
 104
 105         dispc_set_lcd_timings(t);
 106
 107         r = dss_set_clock_div(&dss_cinfo);
 108         if (r)
 109                 goto err2;
 110
 111         r = dispc_set_clock_div(&dispc_cinfo);
 112         if (r)
 113                 goto err2;
 114
 115         if (!sdi.skip_init) {
 116                 dss_sdi_init(dssdev->phy.sdi.datapairs);
 117                 r = dss_sdi_enable();
 118                 if (r)
 119                         goto err1;
 120                 mdelay(2);
 121         }
 122
 123         dssdev->manager->enable(dssdev->manager);
 124
 125         sdi.skip_init = 0;
 126
 127         return 0;
 128 err2:
 129         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 130         regulator_disable(sdi.vdds_sdi_reg);
 131 err1:
 132         omap_dss_stop_device(dssdev);
 133 err0:
 134         return r;
 135 }
 136 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 137
 138 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 139 {
 140         dssdev->manager->disable(dssdev->manager);
 141
 142         dss_sdi_disable();
 143
 144         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 145
 146         regulator_disable(sdi.vdds_sdi_reg);
 147
 148         omap_dss_stop_device(dssdev);
 149 }
 150 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 151
 152 int sdi_init_display(struct omap_dss_device *dssdev)
 153 {
 154         DSSDBG("SDI init\n");
 155
 156         return 0;
 157 }
 158
 159 int sdi_init(bool skip_init)
 160 {
 161         /* we store this for first display enable, then clear it */
 162         sdi.skip_init = skip_init;
 163
 164         sdi.vdds_sdi_reg = dss_get_vdds_sdi();
 165         if (IS_ERR(sdi.vdds_sdi_reg)) {
 166                 DSSERR("can't get VDDS_SDI regulator\n");
 167                 return PTR_ERR(sdi.vdds_sdi_reg);
 168         }
 169         /*
 170          * Enable clocks already here, otherwise there would be a toggle
 171          * of them until sdi_display_enable is called.
 172          */
 173         if (skip_init)
 174                 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
 175         return 0;
 176 }
 177
 178 void sdi_exit(void)
 179 {
 180 }