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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_panel.h>
23#include <linux/videodev2.h>
24#include <video/of_display_timing.h>
25#include <linux/of_graph.h>
26
27#include "imx-drm.h"
28
29struct 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 struct drm_display_mode mode;
37 struct drm_panel *panel;
38 struct drm_bridge *bridge;
39};
40
41static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
42{
43 return container_of(c, struct imx_parallel_display, connector);
44}
45
46static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
47{
48 return container_of(e, struct imx_parallel_display, encoder);
49}
50
51static enum drm_connector_status imx_pd_connector_detect(
52 struct drm_connector *connector, bool force)
53{
54 return connector_status_connected;
55}
56
57static int imx_pd_connector_get_modes(struct drm_connector *connector)
58{
59 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
60 struct device_node *np = imxpd->dev->of_node;
61 int num_modes = 0;
62
63 if (imxpd->panel && imxpd->panel->funcs &&
64 imxpd->panel->funcs->get_modes) {
65 num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
66 if (num_modes > 0)
67 return num_modes;
68 }
69
70 if (imxpd->edid) {
71 drm_mode_connector_update_edid_property(connector, imxpd->edid);
72 num_modes = drm_add_edid_modes(connector, imxpd->edid);
73 }
74
75 if (np) {
76 struct drm_display_mode *mode = drm_mode_create(connector->dev);
77 int ret;
78
79 if (!mode)
80 return -EINVAL;
81
82 ret = of_get_drm_display_mode(np, &imxpd->mode,
83 OF_USE_NATIVE_MODE);
84 if (ret)
85 return ret;
86
87 drm_mode_copy(mode, &imxpd->mode);
88 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
89 drm_mode_probed_add(connector, mode);
90 num_modes++;
91 }
92
93 return num_modes;
94}
95
96static struct drm_encoder *imx_pd_connector_best_encoder(
97 struct drm_connector *connector)
98{
99 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
100
101 return &imxpd->encoder;
102}
103
104static void imx_pd_encoder_enable(struct drm_encoder *encoder)
105{
106 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
107
108 drm_panel_prepare(imxpd->panel);
109 drm_panel_enable(imxpd->panel);
110}
111
112static void imx_pd_encoder_disable(struct drm_encoder *encoder)
113{
114 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
115
116 drm_panel_disable(imxpd->panel);
117 drm_panel_unprepare(imxpd->panel);
118}
119
120static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
121 struct drm_crtc_state *crtc_state,
122 struct drm_connector_state *conn_state)
123{
124 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
125 struct drm_display_info *di = &conn_state->connector->display_info;
126 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
127
128 imx_crtc_state->bus_flags = di->bus_flags;
129 if (!imxpd->bus_format && di->num_bus_formats)
130 imx_crtc_state->bus_format = di->bus_formats[0];
131 else
132 imx_crtc_state->bus_format = imxpd->bus_format;
133 imx_crtc_state->di_hsync_pin = 2;
134 imx_crtc_state->di_vsync_pin = 3;
135
136 return 0;
137}
138
139static const struct drm_connector_funcs imx_pd_connector_funcs = {
140 .dpms = drm_atomic_helper_connector_dpms,
141 .fill_modes = drm_helper_probe_single_connector_modes,
142 .detect = imx_pd_connector_detect,
143 .destroy = imx_drm_connector_destroy,
144 .reset = drm_atomic_helper_connector_reset,
145 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
146 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
147};
148
149static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
150 .get_modes = imx_pd_connector_get_modes,
151 .best_encoder = imx_pd_connector_best_encoder,
152};
153
154static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
155 .destroy = imx_drm_encoder_destroy,
156};
157
158static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
159 .enable = imx_pd_encoder_enable,
160 .disable = imx_pd_encoder_disable,
161 .atomic_check = imx_pd_encoder_atomic_check,
162};
163
164static int imx_pd_register(struct drm_device *drm,
165 struct imx_parallel_display *imxpd)
166{
167 struct drm_encoder *encoder = &imxpd->encoder;
168 int ret;
169
170 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
171 if (ret)
172 return ret;
173
174
175
176
177
178
179 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
180
181 drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
182 drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
183 DRM_MODE_ENCODER_NONE, NULL);
184
185 if (!imxpd->bridge) {
186 drm_connector_helper_add(&imxpd->connector,
187 &imx_pd_connector_helper_funcs);
188 drm_connector_init(drm, &imxpd->connector,
189 &imx_pd_connector_funcs,
190 DRM_MODE_CONNECTOR_VGA);
191 }
192
193 if (imxpd->panel)
194 drm_panel_attach(imxpd->panel, &imxpd->connector);
195
196 if (imxpd->bridge) {
197 imxpd->bridge->encoder = encoder;
198 encoder->bridge = imxpd->bridge;
199 ret = drm_bridge_attach(drm, imxpd->bridge);
200 if (ret < 0) {
201 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
202 ret);
203 return ret;
204 }
205 } else {
206 drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
207 }
208
209 return 0;
210}
211
212static 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 *ep;
217 const u8 *edidp;
218 struct imx_parallel_display *imxpd;
219 int ret;
220 u32 bus_format = 0;
221 const char *fmt;
222
223 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
224 if (!imxpd)
225 return -ENOMEM;
226
227 edidp = of_get_property(np, "edid", &imxpd->edid_len);
228 if (edidp)
229 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
230
231 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
232 if (!ret) {
233 if (!strcmp(fmt, "rgb24"))
234 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
235 else if (!strcmp(fmt, "rgb565"))
236 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
237 else if (!strcmp(fmt, "bgr666"))
238 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
239 else if (!strcmp(fmt, "lvds666"))
240 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
241 }
242 imxpd->bus_format = bus_format;
243
244
245 ep = of_graph_get_endpoint_by_regs(np, 1, -1);
246 if (ep) {
247 struct device_node *remote;
248
249 remote = of_graph_get_remote_port_parent(ep);
250 if (!remote) {
251 dev_warn(dev, "endpoint %s not connected\n",
252 ep->full_name);
253 of_node_put(ep);
254 return -ENODEV;
255 }
256 of_node_put(ep);
257
258 imxpd->panel = of_drm_find_panel(remote);
259 if (imxpd->panel) {
260 dev_dbg(dev, "found panel %s\n", remote->full_name);
261 } else {
262 imxpd->bridge = of_drm_find_bridge(remote);
263 if (imxpd->bridge)
264 dev_dbg(dev, "found bridge %s\n",
265 remote->full_name);
266 }
267 if (!imxpd->panel && !imxpd->bridge) {
268 dev_dbg(dev, "waiting for panel or bridge %s\n",
269 remote->full_name);
270 of_node_put(remote);
271 return -EPROBE_DEFER;
272 }
273 of_node_put(remote);
274 }
275
276 imxpd->dev = dev;
277
278 ret = imx_pd_register(drm, imxpd);
279 if (ret)
280 return ret;
281
282 dev_set_drvdata(dev, imxpd);
283
284 return 0;
285}
286
287static void imx_pd_unbind(struct device *dev, struct device *master,
288 void *data)
289{
290 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
291
292 imxpd->encoder.funcs->destroy(&imxpd->encoder);
293 imxpd->connector.funcs->destroy(&imxpd->connector);
294
295 kfree(imxpd->edid);
296}
297
298static const struct component_ops imx_pd_ops = {
299 .bind = imx_pd_bind,
300 .unbind = imx_pd_unbind,
301};
302
303static int imx_pd_probe(struct platform_device *pdev)
304{
305 return component_add(&pdev->dev, &imx_pd_ops);
306}
307
308static int imx_pd_remove(struct platform_device *pdev)
309{
310 component_del(&pdev->dev, &imx_pd_ops);
311
312 return 0;
313}
314
315static const struct of_device_id imx_pd_dt_ids[] = {
316 { .compatible = "fsl,imx-parallel-display", },
317 { }
318};
319MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
320
321static struct platform_driver imx_pd_driver = {
322 .probe = imx_pd_probe,
323 .remove = imx_pd_remove,
324 .driver = {
325 .of_match_table = imx_pd_dt_ids,
326 .name = "imx-parallel-display",
327 },
328};
329
330module_platform_driver(imx_pd_driver);
331
332MODULE_DESCRIPTION("i.MX parallel display driver");
333MODULE_AUTHOR("Sascha Hauer, Pengutronix");
334MODULE_LICENSE("GPL");
335MODULE_ALIAS("platform:imx-parallel-display");
336
