1 /*
2  * Copyright (C) 2014 Traphandler
3  * Copyright (C) 2014 Free Electrons
4  * Copyright (C) 2014 Atmel
5  *
6  * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
7  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
8  *
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU General Public License version 2 as published by
11  * the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but WITHOUT
14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
16  * more details.
17  *
18  * You should have received a copy of the GNU General Public License along with
19  * this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21 
22 #include <linux/of_graph.h>
23 
24 #include <drm/drmP.h>
25 #include <drm/drm_panel.h>
26 
27 #include "atmel_hlcdc_dc.h"
28 
29 /**
30  * Atmel HLCDC RGB output mode
31  */
32 enum atmel_hlcdc_connector_rgb_mode {
33 	ATMEL_HLCDC_CONNECTOR_RGB444,
34 	ATMEL_HLCDC_CONNECTOR_RGB565,
35 	ATMEL_HLCDC_CONNECTOR_RGB666,
36 	ATMEL_HLCDC_CONNECTOR_RGB888,
37 };
38 
39 /**
40  * Atmel HLCDC RGB connector structure
41  *
42  * This structure stores RGB slave device information.
43  *
44  * @connector: DRM connector
45  * @encoder: DRM encoder
46  * @dc: pointer to the atmel_hlcdc_dc structure
47  * @dpms: current DPMS mode
48  */
49 struct atmel_hlcdc_rgb_output {
50 	struct drm_connector connector;
51 	struct drm_encoder encoder;
52 	struct atmel_hlcdc_dc *dc;
53 	int dpms;
54 };
55 
56 static inline struct atmel_hlcdc_rgb_output *
57 drm_connector_to_atmel_hlcdc_rgb_output(struct drm_connector *connector)
58 {
59 	return container_of(connector, struct atmel_hlcdc_rgb_output,
60 			    connector);
61 }
62 
63 static inline struct atmel_hlcdc_rgb_output *
64 drm_encoder_to_atmel_hlcdc_rgb_output(struct drm_encoder *encoder)
65 {
66 	return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
67 }
68 
69 /**
70  * Atmel HLCDC Panel device structure
71  *
72  * This structure is specialization of the slave device structure to
73  * interface with drm panels.
74  *
75  * @base: base slave device fields
76  * @panel: drm panel attached to this slave device
77  */
78 struct atmel_hlcdc_panel {
79 	struct atmel_hlcdc_rgb_output base;
80 	struct drm_panel *panel;
81 };
82 
83 static inline struct atmel_hlcdc_panel *
84 atmel_hlcdc_rgb_output_to_panel(struct atmel_hlcdc_rgb_output *output)
85 {
86 	return container_of(output, struct atmel_hlcdc_panel, base);
87 }
88 
89 static void atmel_hlcdc_panel_encoder_enable(struct drm_encoder *encoder)
90 {
91 	struct atmel_hlcdc_rgb_output *rgb =
92 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
93 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
94 
95 	drm_panel_enable(panel->panel);
96 }
97 
98 static void atmel_hlcdc_panel_encoder_disable(struct drm_encoder *encoder)
99 {
100 	struct atmel_hlcdc_rgb_output *rgb =
101 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
102 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
103 
104 	drm_panel_disable(panel->panel);
105 }
106 
107 static bool
108 atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
109 				     const struct drm_display_mode *mode,
110 				     struct drm_display_mode *adjusted)
111 {
112 	return true;
113 }
114 
115 static void
116 atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
117 				 struct drm_display_mode *mode,
118 				 struct drm_display_mode *adjusted)
119 {
120 	struct atmel_hlcdc_rgb_output *rgb =
121 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
122 	struct drm_display_info *info = &rgb->connector.display_info;
123 	unsigned int cfg;
124 
125 	cfg = 0;
126 
127 	if (info->num_bus_formats) {
128 		switch (info->bus_formats[0]) {
129 		case MEDIA_BUS_FMT_RGB666_1X18:
130 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
131 			break;
132 		case MEDIA_BUS_FMT_RGB888_1X24:
133 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
134 			break;
135 		default:
136 			break;
137 		}
138 	}
139 
140 	regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
141 			   ATMEL_HLCDC_MODE_MASK,
142 			   cfg);
143 }
144 
145 static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
146 	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
147 	.mode_set = atmel_hlcdc_rgb_encoder_mode_set,
148 	.disable = atmel_hlcdc_panel_encoder_disable,
149 	.enable = atmel_hlcdc_panel_encoder_enable,
150 };
151 
152 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
153 {
154 	drm_encoder_cleanup(encoder);
155 	memset(encoder, 0, sizeof(*encoder));
156 }
157 
158 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
159 	.destroy = atmel_hlcdc_rgb_encoder_destroy,
160 };
161 
162 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
163 {
164 	struct atmel_hlcdc_rgb_output *rgb =
165 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
166 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
167 
168 	return panel->panel->funcs->get_modes(panel->panel);
169 }
170 
171 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
172 				      struct drm_display_mode *mode)
173 {
174 	struct atmel_hlcdc_rgb_output *rgb =
175 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
176 
177 	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
178 }
179 
180 
181 
182 static struct drm_encoder *
183 atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
184 {
185 	struct atmel_hlcdc_rgb_output *rgb =
186 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
187 
188 	return &rgb->encoder;
189 }
190 
191 static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
192 	.get_modes = atmel_hlcdc_panel_get_modes,
193 	.mode_valid = atmel_hlcdc_rgb_mode_valid,
194 	.best_encoder = atmel_hlcdc_rgb_best_encoder,
195 };
196 
197 static enum drm_connector_status
198 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
199 {
200 	return connector_status_connected;
201 }
202 
203 static void
204 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
205 {
206 	struct atmel_hlcdc_rgb_output *rgb =
207 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
208 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
209 
210 	drm_panel_detach(panel->panel);
211 	drm_connector_cleanup(connector);
212 }
213 
214 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
215 	.dpms = drm_atomic_helper_connector_dpms,
216 	.detect = atmel_hlcdc_panel_connector_detect,
217 	.fill_modes = drm_helper_probe_single_connector_modes,
218 	.destroy = atmel_hlcdc_panel_connector_destroy,
219 	.reset = drm_atomic_helper_connector_reset,
220 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
221 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
222 };
223 
224 static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
225 					   struct of_endpoint *ep)
226 {
227 	struct atmel_hlcdc_dc *dc = dev->dev_private;
228 	struct device_node *np;
229 	struct drm_panel *p = NULL;
230 	struct atmel_hlcdc_panel *panel;
231 	int ret;
232 
233 	np = of_graph_get_remote_port_parent(ep->local_node);
234 	if (!np)
235 		return -EINVAL;
236 
237 	p = of_drm_find_panel(np);
238 	of_node_put(np);
239 
240 	if (!p)
241 		return -EPROBE_DEFER;
242 
243 	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
244 	if (!panel)
245 		return -EINVAL;
246 
247 	panel->base.dpms = DRM_MODE_DPMS_OFF;
248 
249 	panel->base.dc = dc;
250 
251 	drm_encoder_helper_add(&panel->base.encoder,
252 			       &atmel_hlcdc_panel_encoder_helper_funcs);
253 	ret = drm_encoder_init(dev, &panel->base.encoder,
254 			       &atmel_hlcdc_panel_encoder_funcs,
255 			       DRM_MODE_ENCODER_LVDS);
256 	if (ret)
257 		return ret;
258 
259 	panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
260 	panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
261 	drm_connector_helper_add(&panel->base.connector,
262 				 &atmel_hlcdc_panel_connector_helper_funcs);
263 	ret = drm_connector_init(dev, &panel->base.connector,
264 				 &atmel_hlcdc_panel_connector_funcs,
265 				 DRM_MODE_CONNECTOR_LVDS);
266 	if (ret)
267 		goto err_encoder_cleanup;
268 
269 	drm_mode_connector_attach_encoder(&panel->base.connector,
270 					  &panel->base.encoder);
271 	panel->base.encoder.possible_crtcs = 0x1;
272 
273 	drm_panel_attach(p, &panel->base.connector);
274 	panel->panel = p;
275 
276 	return 0;
277 
278 err_encoder_cleanup:
279 	drm_encoder_cleanup(&panel->base.encoder);
280 
281 	return ret;
282 }
283 
284 int atmel_hlcdc_create_outputs(struct drm_device *dev)
285 {
286 	struct device_node *port_np, *np;
287 	struct of_endpoint ep;
288 	int ret;
289 
290 	port_np = of_get_child_by_name(dev->dev->of_node, "port");
291 	if (!port_np)
292 		return -EINVAL;
293 
294 	np = of_get_child_by_name(port_np, "endpoint");
295 	of_node_put(port_np);
296 
297 	if (!np)
298 		return -EINVAL;
299 
300 	ret = of_graph_parse_endpoint(np, &ep);
301 	of_node_put(port_np);
302 
303 	if (ret)
304 		return ret;
305 
306 	/* We currently only support panel output */
307 	return atmel_hlcdc_create_panel_output(dev, &ep);
308 }
309