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