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_atomic_helper.h>
20 #include <drm/drm_fb_helper.h>
21 #include <drm/drm_crtc_helper.h>
22 #include <drm/drm_of.h>
23 #include <drm/drm_panel.h>
24 #include <linux/videodev2.h>
25 #include <video/of_display_timing.h>
26
27 #include "imx-drm.h"
28
29 struct imx_parallel_display {
30 struct drm_connector connector;
31 struct drm_encoder encoder;
32 struct device *dev;
33 void *edid;
34 int edid_len;
35 u32 bus_format;
36 u32 bus_flags;
37 struct drm_display_mode mode;
38 struct drm_panel *panel;
39 struct drm_bridge *bridge;
40 };
41
con_to_imxpd(struct drm_connector * c)42 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
43 {
44 return container_of(c, struct imx_parallel_display, connector);
45 }
46
enc_to_imxpd(struct drm_encoder * e)47 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
48 {
49 return container_of(e, struct imx_parallel_display, encoder);
50 }
51
imx_pd_connector_get_modes(struct drm_connector * connector)52 static int imx_pd_connector_get_modes(struct drm_connector *connector)
53 {
54 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
55 struct device_node *np = imxpd->dev->of_node;
56 int num_modes = 0;
57
58 if (imxpd->panel && imxpd->panel->funcs &&
59 imxpd->panel->funcs->get_modes) {
60 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
61 if (num_modes > 0)
62 return num_modes;
63 }
64
65 if (imxpd->edid) {
66 drm_connector_update_edid_property(connector, imxpd->edid);
67 num_modes = drm_add_edid_modes(connector, imxpd->edid);
68 }
69
70 if (np) {
71 struct drm_display_mode *mode = drm_mode_create(connector->dev);
72 int ret;
73
74 if (!mode)
75 return -EINVAL;
76
77 ret = of_get_drm_display_mode(np, &imxpd->mode,
78 &imxpd->bus_flags,
79 OF_USE_NATIVE_MODE);
80 if (ret)
81 return ret;
82
83 drm_mode_copy(mode, &imxpd->mode);
84 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
85 drm_mode_probed_add(connector, mode);
86 num_modes++;
87 }
88
89 return num_modes;
90 }
91
imx_pd_connector_best_encoder(struct drm_connector * connector)92 static struct drm_encoder *imx_pd_connector_best_encoder(
93 struct drm_connector *connector)
94 {
95 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
96
97 return &imxpd->encoder;
98 }
99
imx_pd_encoder_enable(struct drm_encoder * encoder)100 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
101 {
102 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
103
104 drm_panel_prepare(imxpd->panel);
105 drm_panel_enable(imxpd->panel);
106 }
107
imx_pd_encoder_disable(struct drm_encoder * encoder)108 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
109 {
110 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
111
112 drm_panel_disable(imxpd->panel);
113 drm_panel_unprepare(imxpd->panel);
114 }
115
imx_pd_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)116 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
117 struct drm_crtc_state *crtc_state,
118 struct drm_connector_state *conn_state)
119 {
120 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
121 struct drm_display_info *di = &conn_state->connector->display_info;
122 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
123
124 if (!imxpd->bus_format && di->num_bus_formats) {
125 imx_crtc_state->bus_flags = di->bus_flags;
126 imx_crtc_state->bus_format = di->bus_formats[0];
127 } else {
128 imx_crtc_state->bus_flags = imxpd->bus_flags;
129 imx_crtc_state->bus_format = imxpd->bus_format;
130 }
131 imx_crtc_state->di_hsync_pin = 2;
132 imx_crtc_state->di_vsync_pin = 3;
133
134 return 0;
135 }
136
137 static const struct drm_connector_funcs imx_pd_connector_funcs = {
138 .fill_modes = drm_helper_probe_single_connector_modes,
139 .destroy = imx_drm_connector_destroy,
140 .reset = drm_atomic_helper_connector_reset,
141 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
142 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
143 };
144
145 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
146 .get_modes = imx_pd_connector_get_modes,
147 .best_encoder = imx_pd_connector_best_encoder,
148 };
149
150 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
151 .destroy = imx_drm_encoder_destroy,
152 };
153
154 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
155 .enable = imx_pd_encoder_enable,
156 .disable = imx_pd_encoder_disable,
157 .atomic_check = imx_pd_encoder_atomic_check,
158 };
159
imx_pd_register(struct drm_device * drm,struct imx_parallel_display * imxpd)160 static int imx_pd_register(struct drm_device *drm,
161 struct imx_parallel_display *imxpd)
162 {
163 struct drm_encoder *encoder = &imxpd->encoder;
164 int ret;
165
166 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
167 if (ret)
168 return ret;
169
170 /* set the connector's dpms to OFF so that
171 * drm_helper_connector_dpms() won't return
172 * immediately since the current state is ON
173 * at this point.
174 */
175 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
176
177 drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
178 drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
179 DRM_MODE_ENCODER_NONE, NULL);
180
181 if (!imxpd->bridge) {
182 drm_connector_helper_add(&imxpd->connector,
183 &imx_pd_connector_helper_funcs);
184 drm_connector_init(drm, &imxpd->connector,
185 &imx_pd_connector_funcs,
186 DRM_MODE_CONNECTOR_DPI);
187 }
188
189 if (imxpd->panel)
190 drm_panel_attach(imxpd->panel, &imxpd->connector);
191
192 if (imxpd->bridge) {
193 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
194 if (ret < 0) {
195 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
196 ret);
197 return ret;
198 }
199 } else {
200 drm_connector_attach_encoder(&imxpd->connector, encoder);
201 }
202
203 return 0;
204 }
205
imx_pd_bind(struct device * dev,struct device * master,void * data)206 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
207 {
208 struct drm_device *drm = data;
209 struct device_node *np = dev->of_node;
210 const u8 *edidp;
211 struct imx_parallel_display *imxpd;
212 int ret;
213 u32 bus_format = 0;
214 const char *fmt;
215
216 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
217 if (!imxpd)
218 return -ENOMEM;
219
220 edidp = of_get_property(np, "edid", &imxpd->edid_len);
221 if (edidp)
222 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
223
224 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
225 if (!ret) {
226 if (!strcmp(fmt, "rgb24"))
227 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
228 else if (!strcmp(fmt, "rgb565"))
229 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
230 else if (!strcmp(fmt, "bgr666"))
231 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
232 else if (!strcmp(fmt, "lvds666"))
233 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
234 }
235 imxpd->bus_format = bus_format;
236
237 /* port@1 is the output port */
238 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
239 if (ret && ret != -ENODEV)
240 return ret;
241
242 imxpd->dev = dev;
243
244 ret = imx_pd_register(drm, imxpd);
245 if (ret)
246 return ret;
247
248 dev_set_drvdata(dev, imxpd);
249
250 return 0;
251 }
252
imx_pd_unbind(struct device * dev,struct device * master,void * data)253 static void imx_pd_unbind(struct device *dev, struct device *master,
254 void *data)
255 {
256 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
257
258 if (imxpd->panel)
259 drm_panel_detach(imxpd->panel);
260
261 kfree(imxpd->edid);
262 }
263
264 static const struct component_ops imx_pd_ops = {
265 .bind = imx_pd_bind,
266 .unbind = imx_pd_unbind,
267 };
268
imx_pd_probe(struct platform_device * pdev)269 static int imx_pd_probe(struct platform_device *pdev)
270 {
271 return component_add(&pdev->dev, &imx_pd_ops);
272 }
273
imx_pd_remove(struct platform_device * pdev)274 static int imx_pd_remove(struct platform_device *pdev)
275 {
276 component_del(&pdev->dev, &imx_pd_ops);
277
278 return 0;
279 }
280
281 static const struct of_device_id imx_pd_dt_ids[] = {
282 { .compatible = "fsl,imx-parallel-display", },
283 { /* sentinel */ }
284 };
285 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
286
287 static struct platform_driver imx_pd_driver = {
288 .probe = imx_pd_probe,
289 .remove = imx_pd_remove,
290 .driver = {
291 .of_match_table = imx_pd_dt_ids,
292 .name = "imx-parallel-display",
293 },
294 };
295
296 module_platform_driver(imx_pd_driver);
297
298 MODULE_DESCRIPTION("i.MX parallel display driver");
299 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
300 MODULE_LICENSE("GPL");
301 MODULE_ALIAS("platform:imx-parallel-display");
302