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
sdi_basic_init(struct omap_dss_device * dssdev)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
omapdss_sdi_display_enable(struct omap_dss_device * dssdev)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
omapdss_sdi_display_disable(struct omap_dss_device * dssdev)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
sdi_init_display(struct omap_dss_device * dssdev)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
sdi_init(void)185 int sdi_init(void)
186 {
187 return 0;
188 }
189
sdi_exit(void)190 void sdi_exit(void)
191 {
192 }
193