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>
28 #include <linux/string.h>
30 #include <video/omapdss.h>
35 struct regulator *vdds_sdi_reg;
37 struct dss_lcd_mgr_config mgr_config;
38 struct omap_video_timings timings;
41 struct omap_dss_output output;
44 static void sdi_config_lcd_manager(struct omap_dss_device *dssdev)
46 struct omap_overlay_manager *mgr = dssdev->output->manager;
48 sdi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
50 sdi.mgr_config.stallmode = false;
51 sdi.mgr_config.fifohandcheck = false;
53 sdi.mgr_config.video_port_width = 24;
54 sdi.mgr_config.lcden_sig_polarity = 1;
56 dss_mgr_set_lcd_config(mgr, &sdi.mgr_config);
59 int omapdss_sdi_display_enable(struct omap_dss_device *dssdev)
61 struct omap_dss_output *out = dssdev->output;
62 struct omap_video_timings *t = &sdi.timings;
63 struct dss_clock_info dss_cinfo;
64 struct dispc_clock_info dispc_cinfo;
68 if (out == NULL || out->manager == NULL) {
69 DSSERR("failed to enable display: no output/manager\n");
73 r = omap_dss_start_device(dssdev);
75 DSSERR("failed to start device\n");
79 r = regulator_enable(sdi.vdds_sdi_reg);
83 r = dispc_runtime_get();
88 t->data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
89 t->sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE;
91 r = dss_calc_clock_div(t->pixel_clock * 1000, &dss_cinfo, &dispc_cinfo);
93 goto err_calc_clock_div;
95 sdi.mgr_config.clock_info = dispc_cinfo;
97 pck = dss_cinfo.fck / dispc_cinfo.lck_div / dispc_cinfo.pck_div / 1000;
99 if (pck != t->pixel_clock) {
100 DSSWARN("Could not find exact pixel clock. Requested %d kHz, "
102 t->pixel_clock, pck);
104 t->pixel_clock = pck;
108 dss_mgr_set_timings(out->manager, t);
110 r = dss_set_clock_div(&dss_cinfo);
112 goto err_set_dss_clock_div;
114 sdi_config_lcd_manager(dssdev);
117 * LCLK and PCLK divisors are located in shadow registers, and we
118 * normally write them to DISPC registers when enabling the output.
119 * However, SDI uses pck-free as source clock for its PLL, and pck-free
120 * is affected by the divisors. And as we need the PLL before enabling
121 * the output, we need to write the divisors early.
123 * It seems just writing to the DISPC register is enough, and we don't
124 * need to care about the shadow register mechanism for pck-free. The
125 * exact reason for this is unknown.
127 dispc_mgr_set_clock_div(out->manager->id, &sdi.mgr_config.clock_info);
129 dss_sdi_init(sdi.datapairs);
130 r = dss_sdi_enable();
135 r = dss_mgr_enable(out->manager);
144 err_set_dss_clock_div:
148 regulator_disable(sdi.vdds_sdi_reg);
150 omap_dss_stop_device(dssdev);
154 EXPORT_SYMBOL(omapdss_sdi_display_enable);
156 void omapdss_sdi_display_disable(struct omap_dss_device *dssdev)
158 struct omap_overlay_manager *mgr = dssdev->output->manager;
160 dss_mgr_disable(mgr);
166 regulator_disable(sdi.vdds_sdi_reg);
168 omap_dss_stop_device(dssdev);
170 EXPORT_SYMBOL(omapdss_sdi_display_disable);
172 void omapdss_sdi_set_timings(struct omap_dss_device *dssdev,
173 struct omap_video_timings *timings)
175 sdi.timings = *timings;
177 EXPORT_SYMBOL(omapdss_sdi_set_timings);
179 void omapdss_sdi_set_datapairs(struct omap_dss_device *dssdev, int datapairs)
181 sdi.datapairs = datapairs;
183 EXPORT_SYMBOL(omapdss_sdi_set_datapairs);
185 static int __init sdi_init_display(struct omap_dss_device *dssdev)
187 DSSDBG("SDI init\n");
189 if (sdi.vdds_sdi_reg == NULL) {
190 struct regulator *vdds_sdi;
192 vdds_sdi = dss_get_vdds_sdi();
194 if (IS_ERR(vdds_sdi)) {
195 DSSERR("can't get VDDS_SDI regulator\n");
196 return PTR_ERR(vdds_sdi);
199 sdi.vdds_sdi_reg = vdds_sdi;
205 static struct omap_dss_device * __init sdi_find_dssdev(struct platform_device *pdev)
207 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
208 const char *def_disp_name = omapdss_get_default_display_name();
209 struct omap_dss_device *def_dssdev;
214 for (i = 0; i < pdata->num_devices; ++i) {
215 struct omap_dss_device *dssdev = pdata->devices[i];
217 if (dssdev->type != OMAP_DISPLAY_TYPE_SDI)
220 if (def_dssdev == NULL)
223 if (def_disp_name != NULL &&
224 strcmp(dssdev->name, def_disp_name) == 0) {
233 static void __init sdi_probe_pdata(struct platform_device *sdidev)
235 struct omap_dss_device *plat_dssdev;
236 struct omap_dss_device *dssdev;
239 plat_dssdev = sdi_find_dssdev(sdidev);
244 dssdev = dss_alloc_and_init_device(&sdidev->dev);
248 dss_copy_device_pdata(dssdev, plat_dssdev);
250 r = sdi_init_display(dssdev);
252 DSSERR("device %s init failed: %d\n", dssdev->name, r);
253 dss_put_device(dssdev);
257 r = omapdss_output_set_device(&sdi.output, dssdev);
259 DSSERR("failed to connect output to new device: %s\n",
261 dss_put_device(dssdev);
265 r = dss_add_device(dssdev);
267 DSSERR("device %s register failed: %d\n", dssdev->name, r);
268 omapdss_output_unset_device(&sdi.output);
269 dss_put_device(dssdev);
274 static void __init sdi_init_output(struct platform_device *pdev)
276 struct omap_dss_output *out = &sdi.output;
279 out->id = OMAP_DSS_OUTPUT_SDI;
280 out->type = OMAP_DISPLAY_TYPE_SDI;
282 dss_register_output(out);
285 static void __exit sdi_uninit_output(struct platform_device *pdev)
287 struct omap_dss_output *out = &sdi.output;
289 dss_unregister_output(out);
292 static int __init omap_sdi_probe(struct platform_device *pdev)
294 sdi_init_output(pdev);
296 sdi_probe_pdata(pdev);
301 static int __exit omap_sdi_remove(struct platform_device *pdev)
303 dss_unregister_child_devices(&pdev->dev);
305 sdi_uninit_output(pdev);
310 static struct platform_driver omap_sdi_driver = {
311 .remove = __exit_p(omap_sdi_remove),
313 .name = "omapdss_sdi",
314 .owner = THIS_MODULE,
318 int __init sdi_init_platform_driver(void)
320 return platform_driver_probe(&omap_sdi_driver, omap_sdi_probe);
323 void __exit sdi_uninit_platform_driver(void)
325 platform_driver_unregister(&omap_sdi_driver);