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(struct omap_dss_device *dssdev)
  39
  40 {
  41         dispc_set_parallel_interface_mode(dssdev->manager->id,
  42                         OMAP_DSS_PARALLELMODE_BYPASS);
  43
  44         dispc_set_lcd_display_type(dssdev->manager->id,
  45                         OMAP_DSS_LCD_DISPLAY_TFT);
  46
  47         dispc_set_tft_data_lines(dssdev->manager->id, 24);
  48         dispc_lcd_enable_signal_polarity(1);
  49 }
  50
  51 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
  52 {
  53         struct omap_video_timings *t = &dssdev->panel.timings;
  54         struct dss_clock_info dss_cinfo;
  55         struct dispc_clock_info dispc_cinfo;
  56         u16 lck_div, pck_div;
  57         unsigned long fck;
  58         unsigned long pck;
  59         int r;
  60
  61         r = omap_dss_start_device(dssdev);
  62         if (r) {
  63                 DSSERR("failed to start device\n");
  64                 goto err0;
  65         }
  66
  67         r = regulator_enable(sdi.vdds_sdi_reg);
  68         if (r)
  69                 goto err1;
  70
  71         /* In case of skip_init sdi_init has already enabled the clocks */
  72         if (!sdi.skip_init)
  73                 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
  74
  75         sdi_basic_init(dssdev);
  76
  77         /* 15.5.9.1.2 */
  78         dssdev->panel.config |= OMAP_DSS_LCD_RF | OMAP_DSS_LCD_ONOFF;
  79
  80         dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
  81                         dssdev->panel.acbi, dssdev->panel.acb);
  82
  83         if (!sdi.skip_init) {
  84                 r = dss_calc_clock_div(1, t->pixel_clock * 1000,
  85                                 &dss_cinfo, &dispc_cinfo);
  86         } else {
  87                 r = dss_get_clock_div(&dss_cinfo);
  88                 r = dispc_get_clock_div(dssdev->manager->id, &dispc_cinfo);
  89         }
  90
  91         if (r)
  92                 goto err2;
  93
  94         fck = dss_cinfo.fck;
  95         lck_div = dispc_cinfo.lck_div;
  96         pck_div = dispc_cinfo.pck_div;
  97
  98         pck = fck / lck_div / pck_div / 1000;
  99
 100         if (pck != t->pixel_clock) {
 101                 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
 102                                 "got %lu kHz\n",
 103                                 t->pixel_clock, pck);
 104
 105                 t->pixel_clock = pck;
 106         }
 107
 108
 109         dispc_set_lcd_timings(dssdev->manager->id, t);
 110
 111         r = dss_set_clock_div(&dss_cinfo);
 112         if (r)
 113                 goto err2;
 114
 115         r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
 116         if (r)
 117                 goto err2;
 118
 119         if (!sdi.skip_init) {
 120                 dss_sdi_init(dssdev->phy.sdi.datapairs);
 121                 r = dss_sdi_enable();
 122                 if (r)
 123                         goto err1;
 124                 mdelay(2);
 125         }
 126
 127         dssdev->manager->enable(dssdev->manager);
 128
 129         sdi.skip_init = 0;
 130
 131         return 0;
 132 err2:
 133         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 134         regulator_disable(sdi.vdds_sdi_reg);
 135 err1:
 136         omap_dss_stop_device(dssdev);
 137 err0:
 138         return r;
 139 }
 140 EXPORT_SYMBOL(omapdss_sdi_display_enable);
 141
 142 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
 143 {
 144         dssdev->manager->disable(dssdev->manager);
 145
 146         dss_sdi_disable();
 147
 148         dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK1);
 149
 150         regulator_disable(sdi.vdds_sdi_reg);
 151
 152         omap_dss_stop_device(dssdev);
 153 }
 154 EXPORT_SYMBOL(omapdss_sdi_display_disable);
 155
 156 int sdi_init_display(struct omap_dss_device *dssdev)
 157 {
 158         DSSDBG("SDI init\n");
 159
 160         return 0;
 161 }
 162
 163 int sdi_init(bool skip_init)
 164 {
 165         /* we store this for first display enable, then clear it */
 166         sdi.skip_init = skip_init;
 167
 168         sdi.vdds_sdi_reg = dss_get_vdds_sdi();
 169         if (IS_ERR(sdi.vdds_sdi_reg)) {
 170                 DSSERR("can't get VDDS_SDI regulator\n");
 171                 return PTR_ERR(sdi.vdds_sdi_reg);
 172         }
 173         /*
 174          * Enable clocks already here, otherwise there would be a toggle
 175          * of them until sdi_display_enable is called.
 176          */
 177         if (skip_init)
 178                 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK1);
 179         return 0;
 180 }
 181
 182 void sdi_exit(void)
 183 {
 184 }