xref: /linux/drivers/video/fbdev/omap2/omapfb/dss/display.c (revision 746680ec6696585e30db3e18c93a63df9cbec39c)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/drivers/video/omap2/dss/display.c
4  *
5  * Copyright (C) 2009 Nokia Corporation
6  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
7  *
8  * Some code and ideas taken from drivers/video/omap/ driver
9  * by Imre Deak.
10  */
11 
12 #define DSS_SUBSYS_NAME "DISPLAY"
13 
14 #include <linux/export.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/jiffies.h>
18 #include <linux/platform_device.h>
19 #include <linux/of.h>
20 
21 #include <video/omapfb_dss.h>
22 #include "dss.h"
23 #include "dss_features.h"
24 
25 void omapdss_default_get_resolution(struct omap_dss_device *dssdev,
26 			u16 *xres, u16 *yres)
27 {
28 	*xres = dssdev->panel.timings.x_res;
29 	*yres = dssdev->panel.timings.y_res;
30 }
31 EXPORT_SYMBOL(omapdss_default_get_resolution);
32 
33 int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
34 {
35 	switch (dssdev->type) {
36 	case OMAP_DISPLAY_TYPE_DPI:
37 		if (dssdev->phy.dpi.data_lines == 24)
38 			return 24;
39 		else
40 			return 16;
41 
42 	case OMAP_DISPLAY_TYPE_DBI:
43 		if (dssdev->ctrl.pixel_size == 24)
44 			return 24;
45 		else
46 			return 16;
47 	case OMAP_DISPLAY_TYPE_DSI:
48 		if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
49 			return 24;
50 		else
51 			return 16;
52 	case OMAP_DISPLAY_TYPE_VENC:
53 	case OMAP_DISPLAY_TYPE_SDI:
54 	case OMAP_DISPLAY_TYPE_HDMI:
55 	case OMAP_DISPLAY_TYPE_DVI:
56 		return 24;
57 	default:
58 		BUG();
59 		return 0;
60 	}
61 }
62 EXPORT_SYMBOL(omapdss_default_get_recommended_bpp);
63 
64 void omapdss_default_get_timings(struct omap_dss_device *dssdev,
65 		struct omap_video_timings *timings)
66 {
67 	*timings = dssdev->panel.timings;
68 }
69 EXPORT_SYMBOL(omapdss_default_get_timings);
70 
71 int dss_suspend_all_devices(void)
72 {
73 	struct omap_dss_device *dssdev = NULL;
74 
75 	for_each_dss_dev(dssdev) {
76 		if (!dssdev->driver)
77 			continue;
78 
79 		if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
80 			dssdev->driver->disable(dssdev);
81 			dssdev->activate_after_resume = true;
82 		} else {
83 			dssdev->activate_after_resume = false;
84 		}
85 	}
86 
87 	return 0;
88 }
89 
90 int dss_resume_all_devices(void)
91 {
92 	struct omap_dss_device *dssdev = NULL;
93 
94 	for_each_dss_dev(dssdev) {
95 		if (!dssdev->driver)
96 			continue;
97 
98 		if (dssdev->activate_after_resume) {
99 			dssdev->driver->enable(dssdev);
100 			dssdev->activate_after_resume = false;
101 		}
102 	}
103 
104 	return 0;
105 }
106 
107 void dss_disable_all_devices(void)
108 {
109 	struct omap_dss_device *dssdev = NULL;
110 
111 	for_each_dss_dev(dssdev) {
112 		if (!dssdev->driver)
113 			continue;
114 
115 		if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
116 			dssdev->driver->disable(dssdev);
117 	}
118 }
119 
120 static LIST_HEAD(panel_list);
121 static DEFINE_MUTEX(panel_list_mutex);
122 static int disp_num_counter;
123 
124 int omapdss_register_display(struct omap_dss_device *dssdev)
125 {
126 	struct omap_dss_driver *drv = dssdev->driver;
127 	int id;
128 
129 	/*
130 	 * Note: this presumes all the displays are either using DT or non-DT,
131 	 * which normally should be the case. This also presumes that all
132 	 * displays either have an DT alias, or none has.
133 	 */
134 
135 	if (dssdev->dev->of_node) {
136 		id = of_alias_get_id(dssdev->dev->of_node, "display");
137 
138 		if (id < 0)
139 			id = disp_num_counter++;
140 	} else {
141 		id = disp_num_counter++;
142 	}
143 
144 	snprintf(dssdev->alias, sizeof(dssdev->alias), "display%d", id);
145 
146 	/* Use 'label' property for name, if it exists */
147 	if (dssdev->dev->of_node)
148 		of_property_read_string(dssdev->dev->of_node, "label",
149 			&dssdev->name);
150 
151 	if (dssdev->name == NULL)
152 		dssdev->name = dssdev->alias;
153 
154 	if (drv && drv->get_resolution == NULL)
155 		drv->get_resolution = omapdss_default_get_resolution;
156 	if (drv && drv->get_recommended_bpp == NULL)
157 		drv->get_recommended_bpp = omapdss_default_get_recommended_bpp;
158 	if (drv && drv->get_timings == NULL)
159 		drv->get_timings = omapdss_default_get_timings;
160 
161 	mutex_lock(&panel_list_mutex);
162 	list_add_tail(&dssdev->panel_list, &panel_list);
163 	mutex_unlock(&panel_list_mutex);
164 	return 0;
165 }
166 EXPORT_SYMBOL(omapdss_register_display);
167 
168 void omapdss_unregister_display(struct omap_dss_device *dssdev)
169 {
170 	mutex_lock(&panel_list_mutex);
171 	list_del(&dssdev->panel_list);
172 	mutex_unlock(&panel_list_mutex);
173 }
174 EXPORT_SYMBOL(omapdss_unregister_display);
175 
176 struct omap_dss_device *omap_dss_get_device(struct omap_dss_device *dssdev)
177 {
178 	if (!try_module_get(dssdev->owner))
179 		return NULL;
180 
181 	if (get_device(dssdev->dev) == NULL) {
182 		module_put(dssdev->owner);
183 		return NULL;
184 	}
185 
186 	return dssdev;
187 }
188 EXPORT_SYMBOL(omap_dss_get_device);
189 
190 void omap_dss_put_device(struct omap_dss_device *dssdev)
191 {
192 	put_device(dssdev->dev);
193 	module_put(dssdev->owner);
194 }
195 EXPORT_SYMBOL(omap_dss_put_device);
196 
197 /*
198  * ref count of the found device is incremented.
199  * ref count of from-device is decremented.
200  */
201 struct omap_dss_device *omap_dss_get_next_device(struct omap_dss_device *from)
202 {
203 	struct list_head *l;
204 	struct omap_dss_device *dssdev;
205 
206 	mutex_lock(&panel_list_mutex);
207 
208 	if (list_empty(&panel_list)) {
209 		dssdev = NULL;
210 		goto out;
211 	}
212 
213 	if (from == NULL) {
214 		dssdev = list_first_entry(&panel_list, struct omap_dss_device,
215 				panel_list);
216 		omap_dss_get_device(dssdev);
217 		goto out;
218 	}
219 
220 	omap_dss_put_device(from);
221 
222 	list_for_each(l, &panel_list) {
223 		dssdev = list_entry(l, struct omap_dss_device, panel_list);
224 		if (dssdev == from) {
225 			if (list_is_last(l, &panel_list)) {
226 				dssdev = NULL;
227 				goto out;
228 			}
229 
230 			dssdev = list_entry(l->next, struct omap_dss_device,
231 					panel_list);
232 			omap_dss_get_device(dssdev);
233 			goto out;
234 		}
235 	}
236 
237 	WARN(1, "'from' dssdev not found\n");
238 
239 	dssdev = NULL;
240 out:
241 	mutex_unlock(&panel_list_mutex);
242 	return dssdev;
243 }
244 EXPORT_SYMBOL(omap_dss_get_next_device);
245 
246 struct omap_dss_device *omap_dss_find_device(void *data,
247 		int (*match)(struct omap_dss_device *dssdev, void *data))
248 {
249 	struct omap_dss_device *dssdev = NULL;
250 
251 	while ((dssdev = omap_dss_get_next_device(dssdev)) != NULL) {
252 		if (match(dssdev, data))
253 			return dssdev;
254 	}
255 
256 	return NULL;
257 }
258 EXPORT_SYMBOL(omap_dss_find_device);
259 
260 void videomode_to_omap_video_timings(const struct videomode *vm,
261 		struct omap_video_timings *ovt)
262 {
263 	memset(ovt, 0, sizeof(*ovt));
264 
265 	ovt->pixelclock = vm->pixelclock;
266 	ovt->x_res = vm->hactive;
267 	ovt->hbp = vm->hback_porch;
268 	ovt->hfp = vm->hfront_porch;
269 	ovt->hsw = vm->hsync_len;
270 	ovt->y_res = vm->vactive;
271 	ovt->vbp = vm->vback_porch;
272 	ovt->vfp = vm->vfront_porch;
273 	ovt->vsw = vm->vsync_len;
274 
275 	ovt->vsync_level = vm->flags & DISPLAY_FLAGS_VSYNC_HIGH ?
276 		OMAPDSS_SIG_ACTIVE_HIGH :
277 		OMAPDSS_SIG_ACTIVE_LOW;
278 	ovt->hsync_level = vm->flags & DISPLAY_FLAGS_HSYNC_HIGH ?
279 		OMAPDSS_SIG_ACTIVE_HIGH :
280 		OMAPDSS_SIG_ACTIVE_LOW;
281 	ovt->de_level = vm->flags & DISPLAY_FLAGS_DE_HIGH ?
282 		OMAPDSS_SIG_ACTIVE_HIGH :
283 		OMAPDSS_SIG_ACTIVE_LOW;
284 	ovt->data_pclk_edge = vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?
285 		OMAPDSS_DRIVE_SIG_RISING_EDGE :
286 		OMAPDSS_DRIVE_SIG_FALLING_EDGE;
287 
288 	ovt->sync_pclk_edge = ovt->data_pclk_edge;
289 }
290 EXPORT_SYMBOL(videomode_to_omap_video_timings);
291 
292 void omap_video_timings_to_videomode(const struct omap_video_timings *ovt,
293 		struct videomode *vm)
294 {
295 	memset(vm, 0, sizeof(*vm));
296 
297 	vm->pixelclock = ovt->pixelclock;
298 
299 	vm->hactive = ovt->x_res;
300 	vm->hback_porch = ovt->hbp;
301 	vm->hfront_porch = ovt->hfp;
302 	vm->hsync_len = ovt->hsw;
303 	vm->vactive = ovt->y_res;
304 	vm->vback_porch = ovt->vbp;
305 	vm->vfront_porch = ovt->vfp;
306 	vm->vsync_len = ovt->vsw;
307 
308 	if (ovt->hsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
309 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
310 	else
311 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
312 
313 	if (ovt->vsync_level == OMAPDSS_SIG_ACTIVE_HIGH)
314 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
315 	else
316 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
317 
318 	if (ovt->de_level == OMAPDSS_SIG_ACTIVE_HIGH)
319 		vm->flags |= DISPLAY_FLAGS_DE_HIGH;
320 	else
321 		vm->flags |= DISPLAY_FLAGS_DE_LOW;
322 
323 	if (ovt->data_pclk_edge == OMAPDSS_DRIVE_SIG_RISING_EDGE)
324 		vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
325 	else
326 		vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
327 }
328 EXPORT_SYMBOL(omap_video_timings_to_videomode);
329