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 update_enabled;
34 struct regulator *vdds_sdi_reg;
35 } sdi;
36
sdi_basic_init(struct omap_dss_device * dssdev)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
omapdss_sdi_display_enable(struct omap_dss_device * dssdev)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
omapdss_sdi_display_disable(struct omap_dss_device * dssdev)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
sdi_init_display(struct omap_dss_device * dssdev)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
sdi_init(void)163 int sdi_init(void)
164 {
165 return 0;
166 }
167
sdi_exit(void)168 void sdi_exit(void)
169 {
170 }
171