2 * linux/drivers/video/omap2/dss/sdi.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
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.
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
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/>.
20 #define DSS_SUBSYS_NAME "SDI"
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 #include <linux/platform_device.h>
29 #include <video/omapdss.h>
34 struct regulator *vdds_sdi_reg;
36 struct dss_lcd_mgr_config mgr_config;
39 static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
41 sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
43 sdi.mgr_config.stallmode = false;
44 sdi.mgr_config.fifohandcheck = false;
46 sdi.mgr_config.video_port_width = 24;
47 sdi.mgr_config.lcden_sig_polarity = 1;
49 dss_mgr_set_lcd_config(dssdev->manager, &sdi.mgr_config);
52 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
54 struct omap_video_timings *t = &dssdev->panel.timings;
55 struct dss_clock_info dss_cinfo;
56 struct dispc_clock_info dispc_cinfo;
60 if (dssdev->manager == NULL) {
61 DSSERR("failed to enable display: no manager\n");
65 r = omap_dss_start_device(dssdev);
67 DSSERR("failed to start device\n");
71 r = regulator_enable(sdi.vdds_sdi_reg);
75 r = dispc_runtime_get();
80 dssdev->panel.timings.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
81 dssdev->panel.timings.sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
83 r = dss_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
85 goto err_calc_clock_div;
87 sdi.mgr_config.clock_info = dispc_cinfo;
89 pck = dss_cinfo.fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div / 1000;
91 if (pck != t->pixel_clock) {
92 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
100 dss_mgr_set_timings(dssdev->manager, t);
102 r = dss_set_clock_div(&dss_cinfo);
104 goto err_set_dss_clock_div;
106 sdi_config_lcd_manager(dssdev);
109 * LCLK and PCLK divisors are located in shadow registers, and we
110 * normally write them to DISPC registers when enabling the output.
111 * However, SDI uses pck-free as source clock for its PLL, and pck-free
112 * is affected by the divisors. And as we need the PLL before enabling
113 * the output, we need to write the divisors early.
115 * It seems just writing to the DISPC register is enough, and we don't
116 * need to care about the shadow register mechanism for pck-free. The
117 * exact reason for this is unknown.
119 dispc_mgr_set_clock_div(dssdev->manager->id,
120 &sdi.mgr_config.clock_info);
122 dss_sdi_init(dssdev->phy.sdi.datapairs);
123 r = dss_sdi_enable();
128 r = dss_mgr_enable(dssdev->manager);
137 err_set_dss_clock_div:
141 regulator_disable(sdi.vdds_sdi_reg);
143 omap_dss_stop_device(dssdev);
147 EXPORT_SYMBOL(omapdss_sdi_display_enable);
149 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
151 dss_mgr_disable(dssdev->manager);
157 regulator_disable(sdi.vdds_sdi_reg);
159 omap_dss_stop_device(dssdev);
161 EXPORT_SYMBOL(omapdss_sdi_display_disable);
163 static int __init sdi_init_display(struct omap_dss_device *dssdev)
165 DSSDBG("SDI init\n");
167 if (sdi.vdds_sdi_reg == NULL) {
168 struct regulator *vdds_sdi;
170 vdds_sdi = dss_get_vdds_sdi();
172 if (IS_ERR(vdds_sdi)) {
173 DSSERR("can't get VDDS_SDI regulator\n");
174 return PTR_ERR(vdds_sdi);
177 sdi.vdds_sdi_reg = vdds_sdi;
183 static void __init sdi_probe_pdata(struct platform_device *pdev)
185 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
188 for (i = 0; i < pdata->num_devices; ++i) {
189 struct omap_dss_device *dssdev = pdata->devices[i];
191 if (dssdev->type != OMAP_DISPLAY_TYPE_SDI)
194 r = sdi_init_display(dssdev);
196 DSSERR("device %s init failed: %d\n", dssdev->name, r);
200 r = omap_dss_register_device(dssdev, &pdev->dev, i);
202 DSSERR("device %s register failed: %d\n",
207 static int __init omap_sdi_probe(struct platform_device *pdev)
209 sdi_probe_pdata(pdev);
214 static int __exit omap_sdi_remove(struct platform_device *pdev)
216 omap_dss_unregister_child_devices(&pdev->dev);
221 static struct platform_driver omap_sdi_driver = {
222 .remove = __exit_p(omap_sdi_remove),
224 .name = "omapdss_sdi",
225 .owner = THIS_MODULE,
229 int __init sdi_init_platform_driver(void)
231 return platform_driver_probe(&omap_sdi_driver, omap_sdi_probe);
234 void __exit sdi_uninit_platform_driver(void)
236 platform_driver_unregister(&omap_sdi_driver);