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_dpms(struct drm_encoder *encoder,
90 					   int mode)
91 {
92 	struct atmel_hlcdc_rgb_output *rgb =
93 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
94 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
95 
96 	if (mode != DRM_MODE_DPMS_ON)
97 		mode = DRM_MODE_DPMS_OFF;
98 
99 	if (mode == rgb->dpms)
100 		return;
101 
102 	if (mode != DRM_MODE_DPMS_ON)
103 		drm_panel_disable(panel->panel);
104 	else
105 		drm_panel_enable(panel->panel);
106 
107 	rgb->dpms = mode;
108 }
109 
110 static bool
111 atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
112 				     const struct drm_display_mode *mode,
113 				     struct drm_display_mode *adjusted)
114 {
115 	return true;
116 }
117 
118 static void atmel_hlcdc_panel_encoder_prepare(struct drm_encoder *encoder)
119 {
120 	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
121 }
122 
123 static void atmel_hlcdc_panel_encoder_commit(struct drm_encoder *encoder)
124 {
125 	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
126 }
127 
128 static void
129 atmel_hlcdc_rgb_encoder_mode_set(struct drm_encoder *encoder,
130 				 struct drm_display_mode *mode,
131 				 struct drm_display_mode *adjusted)
132 {
133 	struct atmel_hlcdc_rgb_output *rgb =
134 			drm_encoder_to_atmel_hlcdc_rgb_output(encoder);
135 	struct drm_display_info *info = &rgb->connector.display_info;
136 	unsigned int cfg;
137 
138 	cfg = 0;
139 
140 	if (info->num_bus_formats) {
141 		switch (info->bus_formats[0]) {
142 		case MEDIA_BUS_FMT_RGB666_1X18:
143 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB666 << 8;
144 			break;
145 		case MEDIA_BUS_FMT_RGB888_1X24:
146 			cfg |= ATMEL_HLCDC_CONNECTOR_RGB888 << 8;
147 			break;
148 		default:
149 			break;
150 		}
151 	}
152 
153 	regmap_update_bits(rgb->dc->hlcdc->regmap, ATMEL_HLCDC_CFG(5),
154 			   ATMEL_HLCDC_MODE_MASK,
155 			   cfg);
156 }
157 
158 static struct drm_encoder_helper_funcs atmel_hlcdc_panel_encoder_helper_funcs = {
159 	.dpms = atmel_hlcdc_panel_encoder_dpms,
160 	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
161 	.prepare = atmel_hlcdc_panel_encoder_prepare,
162 	.commit = atmel_hlcdc_panel_encoder_commit,
163 	.mode_set = atmel_hlcdc_rgb_encoder_mode_set,
164 };
165 
166 static void atmel_hlcdc_rgb_encoder_destroy(struct drm_encoder *encoder)
167 {
168 	drm_encoder_cleanup(encoder);
169 	memset(encoder, 0, sizeof(*encoder));
170 }
171 
172 static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
173 	.destroy = atmel_hlcdc_rgb_encoder_destroy,
174 };
175 
176 static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
177 {
178 	struct atmel_hlcdc_rgb_output *rgb =
179 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
180 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
181 
182 	return panel->panel->funcs->get_modes(panel->panel);
183 }
184 
185 static int atmel_hlcdc_rgb_mode_valid(struct drm_connector *connector,
186 				      struct drm_display_mode *mode)
187 {
188 	struct atmel_hlcdc_rgb_output *rgb =
189 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
190 
191 	return atmel_hlcdc_dc_mode_valid(rgb->dc, mode);
192 }
193 
194 
195 
196 static struct drm_encoder *
197 atmel_hlcdc_rgb_best_encoder(struct drm_connector *connector)
198 {
199 	struct atmel_hlcdc_rgb_output *rgb =
200 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
201 
202 	return &rgb->encoder;
203 }
204 
205 static struct drm_connector_helper_funcs atmel_hlcdc_panel_connector_helper_funcs = {
206 	.get_modes = atmel_hlcdc_panel_get_modes,
207 	.mode_valid = atmel_hlcdc_rgb_mode_valid,
208 	.best_encoder = atmel_hlcdc_rgb_best_encoder,
209 };
210 
211 static enum drm_connector_status
212 atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
213 {
214 	return connector_status_connected;
215 }
216 
217 static void
218 atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
219 {
220 	struct atmel_hlcdc_rgb_output *rgb =
221 			drm_connector_to_atmel_hlcdc_rgb_output(connector);
222 	struct atmel_hlcdc_panel *panel = atmel_hlcdc_rgb_output_to_panel(rgb);
223 
224 	drm_panel_detach(panel->panel);
225 	drm_connector_cleanup(connector);
226 }
227 
228 static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
229 	.dpms = drm_helper_connector_dpms,
230 	.detect = atmel_hlcdc_panel_connector_detect,
231 	.fill_modes = drm_helper_probe_single_connector_modes,
232 	.destroy = atmel_hlcdc_panel_connector_destroy,
233 };
234 
235 static int atmel_hlcdc_create_panel_output(struct drm_device *dev,
236 					   struct of_endpoint *ep)
237 {
238 	struct atmel_hlcdc_dc *dc = dev->dev_private;
239 	struct device_node *np;
240 	struct drm_panel *p = NULL;
241 	struct atmel_hlcdc_panel *panel;
242 	int ret;
243 
244 	np = of_graph_get_remote_port_parent(ep->local_node);
245 	if (!np)
246 		return -EINVAL;
247 
248 	p = of_drm_find_panel(np);
249 	of_node_put(np);
250 
251 	if (!p)
252 		return -EPROBE_DEFER;
253 
254 	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
255 	if (!panel)
256 		return -EINVAL;
257 
258 	panel->base.dpms = DRM_MODE_DPMS_OFF;
259 
260 	panel->base.dc = dc;
261 
262 	drm_encoder_helper_add(&panel->base.encoder,
263 			       &atmel_hlcdc_panel_encoder_helper_funcs);
264 	ret = drm_encoder_init(dev, &panel->base.encoder,
265 			       &atmel_hlcdc_panel_encoder_funcs,
266 			       DRM_MODE_ENCODER_LVDS);
267 	if (ret)
268 		return ret;
269 
270 	panel->base.connector.dpms = DRM_MODE_DPMS_OFF;
271 	panel->base.connector.polled = DRM_CONNECTOR_POLL_CONNECT;
272 	drm_connector_helper_add(&panel->base.connector,
273 				 &atmel_hlcdc_panel_connector_helper_funcs);
274 	ret = drm_connector_init(dev, &panel->base.connector,
275 				 &atmel_hlcdc_panel_connector_funcs,
276 				 DRM_MODE_CONNECTOR_LVDS);
277 	if (ret)
278 		goto err_encoder_cleanup;
279 
280 	drm_mode_connector_attach_encoder(&panel->base.connector,
281 					  &panel->base.encoder);
282 	panel->base.encoder.possible_crtcs = 0x1;
283 
284 	drm_panel_attach(p, &panel->base.connector);
285 	panel->panel = p;
286 
287 	return 0;
288 
289 err_encoder_cleanup:
290 	drm_encoder_cleanup(&panel->base.encoder);
291 
292 	return ret;
293 }
294 
295 int atmel_hlcdc_create_outputs(struct drm_device *dev)
296 {
297 	struct device_node *port_np, *np;
298 	struct of_endpoint ep;
299 	int ret;
300 
301 	port_np = of_get_child_by_name(dev->dev->of_node, "port");
302 	if (!port_np)
303 		return -EINVAL;
304 
305 	np = of_get_child_by_name(port_np, "endpoint");
306 	of_node_put(port_np);
307 
308 	if (!np)
309 		return -EINVAL;
310 
311 	ret = of_graph_parse_endpoint(np, &ep);
312 	of_node_put(port_np);
313 
314 	if (ret)
315 		return ret;
316 
317 	/* We currently only support panel output */
318 	return atmel_hlcdc_create_panel_output(dev, &ep);
319 }
320