2 * linux/drivers/video/omap2/dss/dpi.c
4 * Copyright (C) 2009 Nokia Corporation
5 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7 * Some code and ideas taken from drivers/video/omap/ driver
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * You should have received a copy of the GNU General Public License along with
20 * this program. If not, see <http://www.gnu.org/licenses/>.
23 #define DSS_SUBSYS_NAME "DPI"
25 #include <linux/kernel.h>
26 #include <linux/delay.h>
27 #include <linux/export.h>
28 #include <linux/err.h>
29 #include <linux/errno.h>
30 #include <linux/platform_device.h>
31 #include <linux/regulator/consumer.h>
33 #include <video/omapdss.h>
39 struct regulator *vdds_dsi_reg;
40 struct platform_device *dsidev;
42 struct dss_lcd_mgr_config mgr_config;
45 static struct platform_device *dpi_get_dsidev(enum omap_dss_clk_source clk)
49 dsi_module = clk == OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ? 0 : 1;
51 return dsi_get_dsidev_from_id(dsi_module);
54 static bool dpi_use_dsi_pll(struct omap_dss_device *dssdev)
56 if (dssdev->clocks.dispc.dispc_fclk_src ==
57 OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
58 dssdev->clocks.dispc.dispc_fclk_src ==
59 OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC ||
60 dssdev->clocks.dispc.channel.lcd_clk_src ==
61 OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC ||
62 dssdev->clocks.dispc.channel.lcd_clk_src ==
63 OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC)
69 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev,
70 unsigned long pck_req, unsigned long *fck, int *lck_div,
73 struct dsi_clock_info dsi_cinfo;
74 struct dispc_clock_info dispc_cinfo;
77 r = dsi_pll_calc_clock_div_pck(dpi.dsidev, pck_req, &dsi_cinfo,
82 r = dsi_pll_set_clock_div(dpi.dsidev, &dsi_cinfo);
86 dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
88 dpi.mgr_config.clock_info = dispc_cinfo;
90 *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
91 *lck_div = dispc_cinfo.lck_div;
92 *pck_div = dispc_cinfo.pck_div;
97 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev,
98 unsigned long pck_req, unsigned long *fck, int *lck_div,
101 struct dss_clock_info dss_cinfo;
102 struct dispc_clock_info dispc_cinfo;
105 r = dss_calc_clock_div(pck_req, &dss_cinfo, &dispc_cinfo);
109 r = dss_set_clock_div(&dss_cinfo);
113 dpi.mgr_config.clock_info = dispc_cinfo;
115 *fck = dss_cinfo.fck;
116 *lck_div = dispc_cinfo.lck_div;
117 *pck_div = dispc_cinfo.pck_div;
122 static int dpi_set_mode(struct omap_dss_device *dssdev)
124 struct omap_video_timings *t = &dssdev->panel.timings;
125 int lck_div = 0, pck_div = 0;
126 unsigned long fck = 0;
130 if (dpi_use_dsi_pll(dssdev))
131 r = dpi_set_dsi_clk(dssdev, t->pixel_clock * 1000, &fck,
134 r = dpi_set_dispc_clk(dssdev, t->pixel_clock * 1000, &fck,
139 pck = fck / lck_div / pck_div / 1000;
141 if (pck != t->pixel_clock) {
142 DSSWARN("Could not find exact pixel clock. "
143 "Requested %d kHz, got %lu kHz\n",
144 t->pixel_clock, pck);
146 t->pixel_clock = pck;
149 dss_mgr_set_timings(dssdev->manager, t);
154 static void dpi_config_lcd_manager(struct omap_dss_device *dssdev)
156 dpi.mgr_config.io_pad_mode = DSS_IO_PAD_MODE_BYPASS;
158 dpi.mgr_config.stallmode = false;
159 dpi.mgr_config.fifohandcheck = false;
161 dpi.mgr_config.video_port_width = dssdev->phy.dpi.data_lines;
163 dpi.mgr_config.lcden_sig_polarity = 0;
165 dss_mgr_set_lcd_config(dssdev->manager, &dpi.mgr_config);
168 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
172 if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
173 DSSERR("no VDSS_DSI regulator\n");
177 if (dssdev->manager == NULL) {
178 DSSERR("failed to enable display: no manager\n");
182 r = omap_dss_start_device(dssdev);
184 DSSERR("failed to start device\n");
188 if (cpu_is_omap34xx()) {
189 r = regulator_enable(dpi.vdds_dsi_reg);
194 r = dispc_runtime_get();
198 if (dpi_use_dsi_pll(dssdev)) {
199 r = dsi_runtime_get(dpi.dsidev);
203 r = dsi_pll_init(dpi.dsidev, 0, 1);
205 goto err_dsi_pll_init;
208 r = dpi_set_mode(dssdev);
212 dpi_config_lcd_manager(dssdev);
216 r = dss_mgr_enable(dssdev->manager);
224 if (dpi_use_dsi_pll(dssdev))
225 dsi_pll_uninit(dpi.dsidev, true);
227 if (dpi_use_dsi_pll(dssdev))
228 dsi_runtime_put(dpi.dsidev);
232 if (cpu_is_omap34xx())
233 regulator_disable(dpi.vdds_dsi_reg);
235 omap_dss_stop_device(dssdev);
239 EXPORT_SYMBOL(omapdss_dpi_display_enable);
241 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
243 dss_mgr_disable(dssdev->manager);
245 if (dpi_use_dsi_pll(dssdev)) {
246 dss_select_dispc_clk_source(OMAP_DSS_CLK_SRC_FCK);
247 dsi_pll_uninit(dpi.dsidev, true);
248 dsi_runtime_put(dpi.dsidev);
253 if (cpu_is_omap34xx())
254 regulator_disable(dpi.vdds_dsi_reg);
256 omap_dss_stop_device(dssdev);
258 EXPORT_SYMBOL(omapdss_dpi_display_disable);
260 void dpi_set_timings(struct omap_dss_device *dssdev,
261 struct omap_video_timings *timings)
265 DSSDBG("dpi_set_timings\n");
266 dssdev->panel.timings = *timings;
267 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
268 r = dispc_runtime_get();
272 dpi_set_mode(dssdev);
276 dss_mgr_set_timings(dssdev->manager, timings);
279 EXPORT_SYMBOL(dpi_set_timings);
281 int dpi_check_timings(struct omap_dss_device *dssdev,
282 struct omap_video_timings *timings)
285 int lck_div, pck_div;
288 struct dispc_clock_info dispc_cinfo;
290 if (dss_mgr_check_timings(dssdev->manager, timings))
293 if (timings->pixel_clock == 0)
296 if (dpi_use_dsi_pll(dssdev)) {
297 struct dsi_clock_info dsi_cinfo;
298 r = dsi_pll_calc_clock_div_pck(dpi.dsidev,
299 timings->pixel_clock * 1000,
300 &dsi_cinfo, &dispc_cinfo);
305 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
307 struct dss_clock_info dss_cinfo;
308 r = dss_calc_clock_div(timings->pixel_clock * 1000,
309 &dss_cinfo, &dispc_cinfo);
317 lck_div = dispc_cinfo.lck_div;
318 pck_div = dispc_cinfo.pck_div;
320 pck = fck / lck_div / pck_div / 1000;
322 timings->pixel_clock = pck;
326 EXPORT_SYMBOL(dpi_check_timings);
328 static int __init dpi_init_display(struct omap_dss_device *dssdev)
330 DSSDBG("init_display\n");
332 if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
333 struct regulator *vdds_dsi;
335 vdds_dsi = dss_get_vdds_dsi();
337 if (IS_ERR(vdds_dsi)) {
338 DSSERR("can't get VDDS_DSI regulator\n");
339 return PTR_ERR(vdds_dsi);
342 dpi.vdds_dsi_reg = vdds_dsi;
345 if (dpi_use_dsi_pll(dssdev)) {
346 enum omap_dss_clk_source dispc_fclk_src =
347 dssdev->clocks.dispc.dispc_fclk_src;
348 dpi.dsidev = dpi_get_dsidev(dispc_fclk_src);
354 static void __init dpi_probe_pdata(struct platform_device *pdev)
356 struct omap_dss_board_info *pdata = pdev->dev.platform_data;
359 for (i = 0; i < pdata->num_devices; ++i) {
360 struct omap_dss_device *dssdev = pdata->devices[i];
362 if (dssdev->type != OMAP_DISPLAY_TYPE_DPI)
365 r = dpi_init_display(dssdev);
367 DSSERR("device %s init failed: %d\n", dssdev->name, r);
371 r = omap_dss_register_device(dssdev, &pdev->dev, i);
373 DSSERR("device %s register failed: %d\n",
378 static int __init omap_dpi_probe(struct platform_device *pdev)
380 dpi_probe_pdata(pdev);
385 static int __exit omap_dpi_remove(struct platform_device *pdev)
387 omap_dss_unregister_child_devices(&pdev->dev);
392 static struct platform_driver omap_dpi_driver = {
393 .remove = __exit_p(omap_dpi_remove),
395 .name = "omapdss_dpi",
396 .owner = THIS_MODULE,
400 int __init dpi_init_platform_driver(void)
402 return platform_driver_probe(&omap_dpi_driver, omap_dpi_probe);
405 void __exit dpi_uninit_platform_driver(void)
407 platform_driver_unregister(&omap_dpi_driver);