1 /*
2 * i.MX drm driver - parallel display implementation
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 #include <linux/component.h>
17 #include <linux/module.h>
18 #include <drm/drmP.h>
19 #include <drm/drm_fb_helper.h>
20 #include <drm/drm_crtc_helper.h>
21 #include <drm/drm_panel.h>
22 #include <linux/videodev2.h>
23 #include <video/of_display_timing.h>
24 #include <linux/of_graph.h>
25
26 #include "imx-drm.h"
27
28 #define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
29 #define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
30
31 struct imx_parallel_display {
32 struct drm_connector connector;
33 struct drm_encoder encoder;
34 struct device *dev;
35 void *edid;
36 int edid_len;
37 u32 bus_format;
38 int mode_valid;
39 struct drm_display_mode mode;
40 struct drm_panel *panel;
41 };
42
imx_pd_connector_detect(struct drm_connector * connector,bool force)43 static enum drm_connector_status imx_pd_connector_detect(
44 struct drm_connector *connector, bool force)
45 {
46 return connector_status_connected;
47 }
48
imx_pd_connector_get_modes(struct drm_connector * connector)49 static int imx_pd_connector_get_modes(struct drm_connector *connector)
50 {
51 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
52 struct device_node *np = imxpd->dev->of_node;
53 int num_modes = 0;
54
55 if (imxpd->panel && imxpd->panel->funcs &&
56 imxpd->panel->funcs->get_modes) {
57 struct drm_display_info *di = &connector->display_info;
58
59 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
60 if (!imxpd->bus_format && di->num_bus_formats)
61 imxpd->bus_format = di->bus_formats[0];
62 if (num_modes > 0)
63 return num_modes;
64 }
65
66 if (imxpd->edid) {
67 drm_mode_connector_update_edid_property(connector, imxpd->edid);
68 num_modes = drm_add_edid_modes(connector, imxpd->edid);
69 }
70
71 if (imxpd->mode_valid) {
72 struct drm_display_mode *mode = drm_mode_create(connector->dev);
73
74 if (!mode)
75 return -EINVAL;
76 drm_mode_copy(mode, &imxpd->mode);
77 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
78 drm_mode_probed_add(connector, mode);
79 num_modes++;
80 }
81
82 if (np) {
83 struct drm_display_mode *mode = drm_mode_create(connector->dev);
84
85 if (!mode)
86 return -EINVAL;
87 of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
88 drm_mode_copy(mode, &imxpd->mode);
89 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
90 drm_mode_probed_add(connector, mode);
91 num_modes++;
92 }
93
94 return num_modes;
95 }
96
imx_pd_connector_best_encoder(struct drm_connector * connector)97 static struct drm_encoder *imx_pd_connector_best_encoder(
98 struct drm_connector *connector)
99 {
100 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
101
102 return &imxpd->encoder;
103 }
104
imx_pd_encoder_dpms(struct drm_encoder * encoder,int mode)105 static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
106 {
107 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
108
109 if (mode != DRM_MODE_DPMS_ON)
110 drm_panel_disable(imxpd->panel);
111 else
112 drm_panel_enable(imxpd->panel);
113 }
114
imx_pd_encoder_mode_fixup(struct drm_encoder * encoder,const struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)115 static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
116 const struct drm_display_mode *mode,
117 struct drm_display_mode *adjusted_mode)
118 {
119 return true;
120 }
121
imx_pd_encoder_prepare(struct drm_encoder * encoder)122 static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
123 {
124 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
125
126 imx_drm_set_bus_format(encoder, imxpd->bus_format);
127 }
128
imx_pd_encoder_commit(struct drm_encoder * encoder)129 static void imx_pd_encoder_commit(struct drm_encoder *encoder)
130 {
131 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
132
133 drm_panel_prepare(imxpd->panel);
134 drm_panel_enable(imxpd->panel);
135 }
136
imx_pd_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * orig_mode,struct drm_display_mode * mode)137 static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
138 struct drm_display_mode *orig_mode,
139 struct drm_display_mode *mode)
140 {
141 }
142
imx_pd_encoder_disable(struct drm_encoder * encoder)143 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
144 {
145 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
146
147 drm_panel_disable(imxpd->panel);
148 drm_panel_unprepare(imxpd->panel);
149 }
150
151 static struct drm_connector_funcs imx_pd_connector_funcs = {
152 .dpms = drm_helper_connector_dpms,
153 .fill_modes = drm_helper_probe_single_connector_modes,
154 .detect = imx_pd_connector_detect,
155 .destroy = imx_drm_connector_destroy,
156 };
157
158 static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
159 .get_modes = imx_pd_connector_get_modes,
160 .best_encoder = imx_pd_connector_best_encoder,
161 };
162
163 static struct drm_encoder_funcs imx_pd_encoder_funcs = {
164 .destroy = imx_drm_encoder_destroy,
165 };
166
167 static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
168 .dpms = imx_pd_encoder_dpms,
169 .mode_fixup = imx_pd_encoder_mode_fixup,
170 .prepare = imx_pd_encoder_prepare,
171 .commit = imx_pd_encoder_commit,
172 .mode_set = imx_pd_encoder_mode_set,
173 .disable = imx_pd_encoder_disable,
174 };
175
imx_pd_register(struct drm_device * drm,struct imx_parallel_display * imxpd)176 static int imx_pd_register(struct drm_device *drm,
177 struct imx_parallel_display *imxpd)
178 {
179 int ret;
180
181 ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
182 imxpd->dev->of_node);
183 if (ret)
184 return ret;
185
186 /* set the connector's dpms to OFF so that
187 * drm_helper_connector_dpms() won't return
188 * immediately since the current state is ON
189 * at this point.
190 */
191 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
192
193 drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
194 drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
195 DRM_MODE_ENCODER_NONE);
196
197 drm_connector_helper_add(&imxpd->connector,
198 &imx_pd_connector_helper_funcs);
199 drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
200 DRM_MODE_CONNECTOR_VGA);
201
202 if (imxpd->panel)
203 drm_panel_attach(imxpd->panel, &imxpd->connector);
204
205 drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
206
207 imxpd->connector.encoder = &imxpd->encoder;
208
209 return 0;
210 }
211
imx_pd_bind(struct device * dev,struct device * master,void * data)212 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
213 {
214 struct drm_device *drm = data;
215 struct device_node *np = dev->of_node;
216 struct device_node *port;
217 const u8 *edidp;
218 struct imx_parallel_display *imxpd;
219 int ret;
220 const char *fmt;
221
222 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
223 if (!imxpd)
224 return -ENOMEM;
225
226 edidp = of_get_property(np, "edid", &imxpd->edid_len);
227 if (edidp)
228 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
229
230 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
231 if (!ret) {
232 if (!strcmp(fmt, "rgb24"))
233 imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
234 else if (!strcmp(fmt, "rgb565"))
235 imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
236 else if (!strcmp(fmt, "bgr666"))
237 imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
238 else if (!strcmp(fmt, "lvds666"))
239 imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
240 }
241
242 /* port@1 is the output port */
243 port = of_graph_get_port_by_id(np, 1);
244 if (port) {
245 struct device_node *endpoint, *remote;
246
247 endpoint = of_get_child_by_name(port, "endpoint");
248 if (endpoint) {
249 remote = of_graph_get_remote_port_parent(endpoint);
250 if (remote)
251 imxpd->panel = of_drm_find_panel(remote);
252 if (!imxpd->panel)
253 return -EPROBE_DEFER;
254 }
255 }
256
257 imxpd->dev = dev;
258
259 ret = imx_pd_register(drm, imxpd);
260 if (ret)
261 return ret;
262
263 dev_set_drvdata(dev, imxpd);
264
265 return 0;
266 }
267
imx_pd_unbind(struct device * dev,struct device * master,void * data)268 static void imx_pd_unbind(struct device *dev, struct device *master,
269 void *data)
270 {
271 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
272
273 imxpd->encoder.funcs->destroy(&imxpd->encoder);
274 imxpd->connector.funcs->destroy(&imxpd->connector);
275
276 kfree(imxpd->edid);
277 }
278
279 static const struct component_ops imx_pd_ops = {
280 .bind = imx_pd_bind,
281 .unbind = imx_pd_unbind,
282 };
283
imx_pd_probe(struct platform_device * pdev)284 static int imx_pd_probe(struct platform_device *pdev)
285 {
286 return component_add(&pdev->dev, &imx_pd_ops);
287 }
288
imx_pd_remove(struct platform_device * pdev)289 static int imx_pd_remove(struct platform_device *pdev)
290 {
291 component_del(&pdev->dev, &imx_pd_ops);
292
293 return 0;
294 }
295
296 static const struct of_device_id imx_pd_dt_ids[] = {
297 { .compatible = "fsl,imx-parallel-display", },
298 { /* sentinel */ }
299 };
300 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
301
302 static struct platform_driver imx_pd_driver = {
303 .probe = imx_pd_probe,
304 .remove = imx_pd_remove,
305 .driver = {
306 .of_match_table = imx_pd_dt_ids,
307 .name = "imx-parallel-display",
308 },
309 };
310
311 module_platform_driver(imx_pd_driver);
312
313 MODULE_DESCRIPTION("i.MX parallel display driver");
314 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
315 MODULE_LICENSE("GPL");
316 MODULE_ALIAS("platform:imx-parallel-display");
317