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/clk.h>
27 #include <linux/delay.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 <plat/display.h>
39 struct regulator *vdds_dsi_reg;
42 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
43 static int dpi_set_dsi_clk(struct omap_dss_device *dssdev, bool is_tft,
44 unsigned long pck_req, unsigned long *fck, int *lck_div,
47 struct dsi_clock_info dsi_cinfo;
48 struct dispc_clock_info dispc_cinfo;
51 r = dsi_pll_calc_clock_div_pck(is_tft, pck_req, &dsi_cinfo,
56 r = dsi_pll_set_clock_div(&dsi_cinfo);
60 dss_select_dispc_clk_source(DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC);
62 r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
66 *fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
67 *lck_div = dispc_cinfo.lck_div;
68 *pck_div = dispc_cinfo.pck_div;
73 static int dpi_set_dispc_clk(struct omap_dss_device *dssdev, bool is_tft,
74 unsigned long pck_req, unsigned long *fck, int *lck_div,
77 struct dss_clock_info dss_cinfo;
78 struct dispc_clock_info dispc_cinfo;
81 r = dss_calc_clock_div(is_tft, pck_req, &dss_cinfo, &dispc_cinfo);
85 r = dss_set_clock_div(&dss_cinfo);
89 r = dispc_set_clock_div(dssdev->manager->id, &dispc_cinfo);
94 *lck_div = dispc_cinfo.lck_div;
95 *pck_div = dispc_cinfo.pck_div;
101 static int dpi_set_mode(struct omap_dss_device *dssdev)
103 struct omap_video_timings *t = &dssdev->panel.timings;
104 int lck_div, pck_div;
110 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
112 dispc_set_pol_freq(dssdev->manager->id, dssdev->panel.config,
113 dssdev->panel.acbi, dssdev->panel.acb);
115 is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
117 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
118 r = dpi_set_dsi_clk(dssdev, is_tft, t->pixel_clock * 1000, &fck,
121 r = dpi_set_dispc_clk(dssdev, is_tft, t->pixel_clock * 1000, &fck,
127 pck = fck / lck_div / pck_div / 1000;
129 if (pck != t->pixel_clock) {
130 DSSWARN("Could not find exact pixel clock. "
131 "Requested %d kHz, got %lu kHz\n",
132 t->pixel_clock, pck);
134 t->pixel_clock = pck;
137 dispc_set_lcd_timings(dssdev->manager->id, t);
140 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
144 static int dpi_basic_init(struct omap_dss_device *dssdev)
148 is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
150 dispc_set_parallel_interface_mode(dssdev->manager->id,
151 OMAP_DSS_PARALLELMODE_BYPASS);
152 dispc_set_lcd_display_type(dssdev->manager->id, is_tft ?
153 OMAP_DSS_LCD_DISPLAY_TFT : OMAP_DSS_LCD_DISPLAY_STN);
154 dispc_set_tft_data_lines(dssdev->manager->id,
155 dssdev->phy.dpi.data_lines);
160 int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
164 r = omap_dss_start_device(dssdev);
166 DSSERR("failed to start device\n");
170 if (cpu_is_omap34xx()) {
171 r = regulator_enable(dpi.vdds_dsi_reg);
176 dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
178 r = dpi_basic_init(dssdev);
182 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
183 dss_clk_enable(DSS_CLK_SYSCK);
184 r = dsi_pll_init(dssdev, 0, 1);
188 r = dpi_set_mode(dssdev);
194 dssdev->manager->enable(dssdev->manager);
199 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
202 dss_clk_disable(DSS_CLK_SYSCK);
205 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
206 if (cpu_is_omap34xx())
207 regulator_disable(dpi.vdds_dsi_reg);
209 omap_dss_stop_device(dssdev);
213 EXPORT_SYMBOL(omapdss_dpi_display_enable);
215 void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
217 dssdev->manager->disable(dssdev->manager);
219 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
220 dss_select_dispc_clk_source(DSS_CLK_SRC_FCK);
222 dss_clk_disable(DSS_CLK_SYSCK);
225 dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
227 if (cpu_is_omap34xx())
228 regulator_disable(dpi.vdds_dsi_reg);
230 omap_dss_stop_device(dssdev);
232 EXPORT_SYMBOL(omapdss_dpi_display_disable);
234 void dpi_set_timings(struct omap_dss_device *dssdev,
235 struct omap_video_timings *timings)
237 DSSDBG("dpi_set_timings\n");
238 dssdev->panel.timings = *timings;
239 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
240 dpi_set_mode(dssdev);
241 dispc_go(dssdev->manager->id);
244 EXPORT_SYMBOL(dpi_set_timings);
246 int dpi_check_timings(struct omap_dss_device *dssdev,
247 struct omap_video_timings *timings)
251 int lck_div, pck_div;
255 if (!dispc_lcd_timings_ok(timings))
258 if (timings->pixel_clock == 0)
261 is_tft = (dssdev->panel.config & OMAP_DSS_LCD_TFT) != 0;
263 #ifdef CONFIG_OMAP2_DSS_USE_DSI_PLL
265 struct dsi_clock_info dsi_cinfo;
266 struct dispc_clock_info dispc_cinfo;
267 r = dsi_pll_calc_clock_div_pck(is_tft,
268 timings->pixel_clock * 1000,
269 &dsi_cinfo, &dispc_cinfo);
274 fck = dsi_cinfo.dsi_pll_hsdiv_dispc_clk;
275 lck_div = dispc_cinfo.lck_div;
276 pck_div = dispc_cinfo.pck_div;
280 struct dss_clock_info dss_cinfo;
281 struct dispc_clock_info dispc_cinfo;
282 r = dss_calc_clock_div(is_tft, timings->pixel_clock * 1000,
283 &dss_cinfo, &dispc_cinfo);
289 lck_div = dispc_cinfo.lck_div;
290 pck_div = dispc_cinfo.pck_div;
294 pck = fck / lck_div / pck_div / 1000;
296 timings->pixel_clock = pck;
300 EXPORT_SYMBOL(dpi_check_timings);
302 int dpi_init_display(struct omap_dss_device *dssdev)
304 DSSDBG("init_display\n");
306 if (cpu_is_omap34xx() && dpi.vdds_dsi_reg == NULL) {
307 struct regulator *vdds_dsi;
309 vdds_dsi = dss_get_vdds_dsi();
311 if (IS_ERR(vdds_dsi)) {
312 DSSERR("can't get VDDS_DSI regulator\n");
313 return PTR_ERR(vdds_dsi);
316 dpi.vdds_dsi_reg = vdds_dsi;
322 int dpi_init(struct platform_device *pdev)