1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * i.MX drm driver - parallel display implementation
4 *
5 * Copyright (C) 2012 Sascha Hauer, Pengutronix
6 */
7
8 #include <linux/component.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/videodev2.h>
12
13 #include <video/of_display_timing.h>
14
15 #include <drm/drm_atomic_helper.h>
16 #include <drm/drm_fb_helper.h>
17 #include <drm/drm_of.h>
18 #include <drm/drm_panel.h>
19 #include <drm/drm_probe_helper.h>
20
21 #include "imx-drm.h"
22
23 struct imx_parallel_display {
24 struct drm_connector connector;
25 struct drm_encoder encoder;
26 struct device *dev;
27 void *edid;
28 int edid_len;
29 u32 bus_format;
30 u32 bus_flags;
31 struct drm_display_mode mode;
32 struct drm_panel *panel;
33 struct drm_bridge *bridge;
34 };
35
con_to_imxpd(struct drm_connector * c)36 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
37 {
38 return container_of(c, struct imx_parallel_display, connector);
39 }
40
enc_to_imxpd(struct drm_encoder * e)41 static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
42 {
43 return container_of(e, struct imx_parallel_display, encoder);
44 }
45
imx_pd_connector_get_modes(struct drm_connector * connector)46 static int imx_pd_connector_get_modes(struct drm_connector *connector)
47 {
48 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
49 struct device_node *np = imxpd->dev->of_node;
50 int num_modes;
51
52 num_modes = drm_panel_get_modes(imxpd->panel);
53 if (num_modes > 0)
54 return num_modes;
55
56 if (imxpd->edid) {
57 drm_connector_update_edid_property(connector, imxpd->edid);
58 num_modes = drm_add_edid_modes(connector, imxpd->edid);
59 }
60
61 if (np) {
62 struct drm_display_mode *mode = drm_mode_create(connector->dev);
63 int ret;
64
65 if (!mode)
66 return -EINVAL;
67
68 ret = of_get_drm_display_mode(np, &imxpd->mode,
69 &imxpd->bus_flags,
70 OF_USE_NATIVE_MODE);
71 if (ret)
72 return ret;
73
74 drm_mode_copy(mode, &imxpd->mode);
75 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
76 drm_mode_probed_add(connector, mode);
77 num_modes++;
78 }
79
80 return num_modes;
81 }
82
imx_pd_connector_best_encoder(struct drm_connector * connector)83 static struct drm_encoder *imx_pd_connector_best_encoder(
84 struct drm_connector *connector)
85 {
86 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
87
88 return &imxpd->encoder;
89 }
90
imx_pd_encoder_enable(struct drm_encoder * encoder)91 static void imx_pd_encoder_enable(struct drm_encoder *encoder)
92 {
93 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
94
95 drm_panel_prepare(imxpd->panel);
96 drm_panel_enable(imxpd->panel);
97 }
98
imx_pd_encoder_disable(struct drm_encoder * encoder)99 static void imx_pd_encoder_disable(struct drm_encoder *encoder)
100 {
101 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
102
103 drm_panel_disable(imxpd->panel);
104 drm_panel_unprepare(imxpd->panel);
105 }
106
imx_pd_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)107 static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
108 struct drm_crtc_state *crtc_state,
109 struct drm_connector_state *conn_state)
110 {
111 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
112 struct drm_display_info *di = &conn_state->connector->display_info;
113 struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
114
115 if (!imxpd->bus_format && di->num_bus_formats) {
116 imx_crtc_state->bus_flags = di->bus_flags;
117 imx_crtc_state->bus_format = di->bus_formats[0];
118 } else {
119 imx_crtc_state->bus_flags = imxpd->bus_flags;
120 imx_crtc_state->bus_format = imxpd->bus_format;
121 }
122 imx_crtc_state->di_hsync_pin = 2;
123 imx_crtc_state->di_vsync_pin = 3;
124
125 return 0;
126 }
127
128 static const struct drm_connector_funcs imx_pd_connector_funcs = {
129 .fill_modes = drm_helper_probe_single_connector_modes,
130 .destroy = imx_drm_connector_destroy,
131 .reset = drm_atomic_helper_connector_reset,
132 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
133 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
134 };
135
136 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
137 .get_modes = imx_pd_connector_get_modes,
138 .best_encoder = imx_pd_connector_best_encoder,
139 };
140
141 static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
142 .destroy = imx_drm_encoder_destroy,
143 };
144
145 static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
146 .enable = imx_pd_encoder_enable,
147 .disable = imx_pd_encoder_disable,
148 .atomic_check = imx_pd_encoder_atomic_check,
149 };
150
imx_pd_register(struct drm_device * drm,struct imx_parallel_display * imxpd)151 static int imx_pd_register(struct drm_device *drm,
152 struct imx_parallel_display *imxpd)
153 {
154 struct drm_encoder *encoder = &imxpd->encoder;
155 int ret;
156
157 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
158 if (ret)
159 return ret;
160
161 /* set the connector's dpms to OFF so that
162 * drm_helper_connector_dpms() won't return
163 * immediately since the current state is ON
164 * at this point.
165 */
166 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
167
168 drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
169 drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
170 DRM_MODE_ENCODER_NONE, NULL);
171
172 if (!imxpd->bridge) {
173 drm_connector_helper_add(&imxpd->connector,
174 &imx_pd_connector_helper_funcs);
175 drm_connector_init(drm, &imxpd->connector,
176 &imx_pd_connector_funcs,
177 DRM_MODE_CONNECTOR_DPI);
178 }
179
180 if (imxpd->panel)
181 drm_panel_attach(imxpd->panel, &imxpd->connector);
182
183 if (imxpd->bridge) {
184 ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
185 if (ret < 0) {
186 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
187 ret);
188 return ret;
189 }
190 } else {
191 drm_connector_attach_encoder(&imxpd->connector, encoder);
192 }
193
194 return 0;
195 }
196
imx_pd_bind(struct device * dev,struct device * master,void * data)197 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
198 {
199 struct drm_device *drm = data;
200 struct device_node *np = dev->of_node;
201 const u8 *edidp;
202 struct imx_parallel_display *imxpd;
203 int ret;
204 u32 bus_format = 0;
205 const char *fmt;
206
207 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
208 if (!imxpd)
209 return -ENOMEM;
210
211 edidp = of_get_property(np, "edid", &imxpd->edid_len);
212 if (edidp)
213 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
214
215 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
216 if (!ret) {
217 if (!strcmp(fmt, "rgb24"))
218 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
219 else if (!strcmp(fmt, "rgb565"))
220 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
221 else if (!strcmp(fmt, "bgr666"))
222 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
223 else if (!strcmp(fmt, "lvds666"))
224 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
225 }
226 imxpd->bus_format = bus_format;
227
228 /* port@1 is the output port */
229 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
230 if (ret && ret != -ENODEV)
231 return ret;
232
233 imxpd->dev = dev;
234
235 ret = imx_pd_register(drm, imxpd);
236 if (ret)
237 return ret;
238
239 dev_set_drvdata(dev, imxpd);
240
241 return 0;
242 }
243
imx_pd_unbind(struct device * dev,struct device * master,void * data)244 static void imx_pd_unbind(struct device *dev, struct device *master,
245 void *data)
246 {
247 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
248
249 if (imxpd->panel)
250 drm_panel_detach(imxpd->panel);
251
252 kfree(imxpd->edid);
253 }
254
255 static const struct component_ops imx_pd_ops = {
256 .bind = imx_pd_bind,
257 .unbind = imx_pd_unbind,
258 };
259
imx_pd_probe(struct platform_device * pdev)260 static int imx_pd_probe(struct platform_device *pdev)
261 {
262 return component_add(&pdev->dev, &imx_pd_ops);
263 }
264
imx_pd_remove(struct platform_device * pdev)265 static int imx_pd_remove(struct platform_device *pdev)
266 {
267 component_del(&pdev->dev, &imx_pd_ops);
268
269 return 0;
270 }
271
272 static const struct of_device_id imx_pd_dt_ids[] = {
273 { .compatible = "fsl,imx-parallel-display", },
274 { /* sentinel */ }
275 };
276 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
277
278 static struct platform_driver imx_pd_driver = {
279 .probe = imx_pd_probe,
280 .remove = imx_pd_remove,
281 .driver = {
282 .of_match_table = imx_pd_dt_ids,
283 .name = "imx-parallel-display",
284 },
285 };
286
287 module_platform_driver(imx_pd_driver);
288
289 MODULE_DESCRIPTION("i.MX parallel display driver");
290 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
291 MODULE_LICENSE("GPL");
292 MODULE_ALIAS("platform:imx-parallel-display");
293
