1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/video/omap2/dss/manager.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 "MANAGER"
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/jiffies.h>
19
20#include <video/omapfb_dss.h>
21
22#include "dss.h"
23#include "dss_features.h"
24
25static int num_managers;
26static struct omap_overlay_manager *managers;
27
28int dss_init_overlay_managers(void)
29{
30	int i;
31
32	num_managers = dss_feat_get_num_mgrs();
33
34	managers = kcalloc(num_managers, sizeof(struct omap_overlay_manager),
35			   GFP_KERNEL);
36
37	BUG_ON(managers == NULL);
38
39	for (i = 0; i < num_managers; ++i) {
40		struct omap_overlay_manager *mgr = &managers[i];
41
42		switch (i) {
43		case 0:
44			mgr->name = "lcd";
45			mgr->id = OMAP_DSS_CHANNEL_LCD;
46			break;
47		case 1:
48			mgr->name = "tv";
49			mgr->id = OMAP_DSS_CHANNEL_DIGIT;
50			break;
51		case 2:
52			mgr->name = "lcd2";
53			mgr->id = OMAP_DSS_CHANNEL_LCD2;
54			break;
55		case 3:
56			mgr->name = "lcd3";
57			mgr->id = OMAP_DSS_CHANNEL_LCD3;
58			break;
59		}
60
61		mgr->supported_displays =
62			dss_feat_get_supported_displays(mgr->id);
63		mgr->supported_outputs =
64			dss_feat_get_supported_outputs(mgr->id);
65
66		INIT_LIST_HEAD(&mgr->overlays);
67	}
68
69	return 0;
70}
71
72int dss_init_overlay_managers_sysfs(struct platform_device *pdev)
73{
74	int i, r;
75
76	for (i = 0; i < num_managers; ++i) {
77		struct omap_overlay_manager *mgr = &managers[i];
78
79		r = dss_manager_kobj_init(mgr, pdev);
80		if (r)
81			DSSERR("failed to create sysfs file\n");
82	}
83
84	return 0;
85}
86
87void dss_uninit_overlay_managers(void)
88{
89	kfree(managers);
90	managers = NULL;
91	num_managers = 0;
92}
93
94void dss_uninit_overlay_managers_sysfs(struct platform_device *pdev)
95{
96	int i;
97
98	for (i = 0; i < num_managers; ++i) {
99		struct omap_overlay_manager *mgr = &managers[i];
100
101		dss_manager_kobj_uninit(mgr);
102	}
103}
104
105int omap_dss_get_num_overlay_managers(void)
106{
107	return num_managers;
108}
109EXPORT_SYMBOL(omap_dss_get_num_overlay_managers);
110
111struct omap_overlay_manager *omap_dss_get_overlay_manager(int num)
112{
113	if (num >= num_managers)
114		return NULL;
115
116	return &managers[num];
117}
118EXPORT_SYMBOL(omap_dss_get_overlay_manager);
119
120int dss_mgr_simple_check(struct omap_overlay_manager *mgr,
121		const struct omap_overlay_manager_info *info)
122{
123	if (dss_has_feature(FEAT_ALPHA_FIXED_ZORDER)) {
124		/*
125		 * OMAP3 supports only graphics source transparency color key
126		 * and alpha blending simultaneously. See TRM 15.4.2.4.2.2
127		 * Alpha Mode.
128		 */
129		if (info->partial_alpha_enabled && info->trans_enabled
130			&& info->trans_key_type != OMAP_DSS_COLOR_KEY_GFX_DST) {
131			DSSERR("check_manager: illegal transparency key\n");
132			return -EINVAL;
133		}
134	}
135
136	return 0;
137}
138
139static int dss_mgr_check_zorder(struct omap_overlay_manager *mgr,
140		struct omap_overlay_info **overlay_infos)
141{
142	struct omap_overlay *ovl1, *ovl2;
143	struct omap_overlay_info *info1, *info2;
144
145	list_for_each_entry(ovl1, &mgr->overlays, list) {
146		info1 = overlay_infos[ovl1->id];
147
148		if (info1 == NULL)
149			continue;
150
151		list_for_each_entry(ovl2, &mgr->overlays, list) {
152			if (ovl1 == ovl2)
153				continue;
154
155			info2 = overlay_infos[ovl2->id];
156
157			if (info2 == NULL)
158				continue;
159
160			if (info1->zorder == info2->zorder) {
161				DSSERR("overlays %d and %d have the same "
162						"zorder %d\n",
163					ovl1->id, ovl2->id, info1->zorder);
164				return -EINVAL;
165			}
166		}
167	}
168
169	return 0;
170}
171
172int dss_mgr_check_timings(struct omap_overlay_manager *mgr,
173		const struct omap_video_timings *timings)
174{
175	if (!dispc_mgr_timings_ok(mgr->id, timings)) {
176		DSSERR("check_manager: invalid timings\n");
177		return -EINVAL;
178	}
179
180	return 0;
181}
182
183static int dss_mgr_check_lcd_config(struct omap_overlay_manager *mgr,
184		const struct dss_lcd_mgr_config *config)
185{
186	struct dispc_clock_info cinfo = config->clock_info;
187	int dl = config->video_port_width;
188	bool stallmode = config->stallmode;
189	bool fifohandcheck = config->fifohandcheck;
190
191	if (cinfo.lck_div < 1 || cinfo.lck_div > 255)
192		return -EINVAL;
193
194	if (cinfo.pck_div < 1 || cinfo.pck_div > 255)
195		return -EINVAL;
196
197	if (dl != 12 && dl != 16 && dl != 18 && dl != 24)
198		return -EINVAL;
199
200	/* fifohandcheck should be used only with stallmode */
201	if (!stallmode && fifohandcheck)
202		return -EINVAL;
203
204	/*
205	 * io pad mode can be only checked by using dssdev connected to the
206	 * manager. Ignore checking these for now, add checks when manager
207	 * is capable of holding information related to the connected interface
208	 */
209
210	return 0;
211}
212
213int dss_mgr_check(struct omap_overlay_manager *mgr,
214		struct omap_overlay_manager_info *info,
215		const struct omap_video_timings *mgr_timings,
216		const struct dss_lcd_mgr_config *lcd_config,
217		struct omap_overlay_info **overlay_infos)
218{
219	struct omap_overlay *ovl;
220	int r;
221
222	if (dss_has_feature(FEAT_ALPHA_FREE_ZORDER)) {
223		r = dss_mgr_check_zorder(mgr, overlay_infos);
224		if (r)
225			return r;
226	}
227
228	r = dss_mgr_check_timings(mgr, mgr_timings);
229	if (r)
230		return r;
231
232	r = dss_mgr_check_lcd_config(mgr, lcd_config);
233	if (r)
234		return r;
235
236	list_for_each_entry(ovl, &mgr->overlays, list) {
237		struct omap_overlay_info *oi;
238		int r;
239
240		oi = overlay_infos[ovl->id];
241
242		if (oi == NULL)
243			continue;
244
245		r = dss_ovl_check(ovl, oi, mgr_timings);
246		if (r)
247			return r;
248	}
249
250	return 0;
251}
252