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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
23struct 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
36static 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
41static 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
46static 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
83static 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
91static 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
99static 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
107static 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
128static 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
136static 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
141static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
142 .destroy = imx_drm_encoder_destroy,
143};
144
145static 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
151static 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
197static 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
244static 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
255static const struct component_ops imx_pd_ops = {
256 .bind = imx_pd_bind,
257 .unbind = imx_pd_unbind,
258};
259
260static int imx_pd_probe(struct platform_device *pdev)
261{
262 return component_add(&pdev->dev, &imx_pd_ops);
263}
264
265static int imx_pd_remove(struct platform_device *pdev)
266{
267 component_del(&pdev->dev, &imx_pd_ops);
268
269 return 0;
270}
271
272static const struct of_device_id imx_pd_dt_ids[] = {
273 { .compatible = "fsl,imx-parallel-display", },
274 { /* sentinel */ }
275};
276MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
277
278static 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
287module_platform_driver(imx_pd_driver);
288
289MODULE_DESCRIPTION("i.MX parallel display driver");
290MODULE_AUTHOR("Sascha Hauer, Pengutronix");
291MODULE_LICENSE("GPL");
292MODULE_ALIAS("platform:imx-parallel-display");
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_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 u32 bus_flags;
37 struct drm_display_mode mode;
38 struct drm_panel *panel;
39 struct drm_bridge *bridge;
40};
41
42static 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
47static 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
52static 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_mode_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
92static 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
100static 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
108static 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
116static 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
137static const struct drm_connector_funcs imx_pd_connector_funcs = {
138 .dpms = drm_atomic_helper_connector_dpms,
139 .fill_modes = drm_helper_probe_single_connector_modes,
140 .destroy = imx_drm_connector_destroy,
141 .reset = drm_atomic_helper_connector_reset,
142 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
143 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
144};
145
146static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
147 .get_modes = imx_pd_connector_get_modes,
148 .best_encoder = imx_pd_connector_best_encoder,
149};
150
151static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
152 .destroy = imx_drm_encoder_destroy,
153};
154
155static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
156 .enable = imx_pd_encoder_enable,
157 .disable = imx_pd_encoder_disable,
158 .atomic_check = imx_pd_encoder_atomic_check,
159};
160
161static int imx_pd_register(struct drm_device *drm,
162 struct imx_parallel_display *imxpd)
163{
164 struct drm_encoder *encoder = &imxpd->encoder;
165 int ret;
166
167 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
168 if (ret)
169 return ret;
170
171 /* set the connector's dpms to OFF so that
172 * drm_helper_connector_dpms() won't return
173 * immediately since the current state is ON
174 * at this point.
175 */
176 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
177
178 drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
179 drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
180 DRM_MODE_ENCODER_NONE, NULL);
181
182 if (!imxpd->bridge) {
183 drm_connector_helper_add(&imxpd->connector,
184 &imx_pd_connector_helper_funcs);
185 drm_connector_init(drm, &imxpd->connector,
186 &imx_pd_connector_funcs,
187 DRM_MODE_CONNECTOR_VGA);
188 }
189
190 if (imxpd->panel)
191 drm_panel_attach(imxpd->panel, &imxpd->connector);
192
193 if (imxpd->bridge) {
194 imxpd->bridge->encoder = encoder;
195 encoder->bridge = imxpd->bridge;
196 ret = drm_bridge_attach(drm, imxpd->bridge);
197 if (ret < 0) {
198 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
199 ret);
200 return ret;
201 }
202 } else {
203 drm_mode_connector_attach_encoder(&imxpd->connector, encoder);
204 }
205
206 return 0;
207}
208
209static int imx_pd_bind(struct device *dev, struct device *master, void *data)
210{
211 struct drm_device *drm = data;
212 struct device_node *np = dev->of_node;
213 struct device_node *ep;
214 const u8 *edidp;
215 struct imx_parallel_display *imxpd;
216 int ret;
217 u32 bus_format = 0;
218 const char *fmt;
219
220 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
221 if (!imxpd)
222 return -ENOMEM;
223
224 edidp = of_get_property(np, "edid", &imxpd->edid_len);
225 if (edidp)
226 imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
227
228 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
229 if (!ret) {
230 if (!strcmp(fmt, "rgb24"))
231 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
232 else if (!strcmp(fmt, "rgb565"))
233 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
234 else if (!strcmp(fmt, "bgr666"))
235 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
236 else if (!strcmp(fmt, "lvds666"))
237 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
238 }
239 imxpd->bus_format = bus_format;
240
241 /* port@1 is the output port */
242 ep = of_graph_get_endpoint_by_regs(np, 1, -1);
243 if (ep) {
244 struct device_node *remote;
245
246 remote = of_graph_get_remote_port_parent(ep);
247 if (!remote) {
248 dev_warn(dev, "endpoint %s not connected\n",
249 ep->full_name);
250 of_node_put(ep);
251 return -ENODEV;
252 }
253 of_node_put(ep);
254
255 imxpd->panel = of_drm_find_panel(remote);
256 if (imxpd->panel) {
257 dev_dbg(dev, "found panel %s\n", remote->full_name);
258 } else {
259 imxpd->bridge = of_drm_find_bridge(remote);
260 if (imxpd->bridge)
261 dev_dbg(dev, "found bridge %s\n",
262 remote->full_name);
263 }
264 if (!imxpd->panel && !imxpd->bridge) {
265 dev_dbg(dev, "waiting for panel or bridge %s\n",
266 remote->full_name);
267 of_node_put(remote);
268 return -EPROBE_DEFER;
269 }
270 of_node_put(remote);
271 }
272
273 imxpd->dev = dev;
274
275 ret = imx_pd_register(drm, imxpd);
276 if (ret)
277 return ret;
278
279 dev_set_drvdata(dev, imxpd);
280
281 return 0;
282}
283
284static void imx_pd_unbind(struct device *dev, struct device *master,
285 void *data)
286{
287 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
288
289 if (imxpd->bridge)
290 drm_bridge_detach(imxpd->bridge);
291 if (imxpd->panel)
292 drm_panel_detach(imxpd->panel);
293
294 kfree(imxpd->edid);
295}
296
297static const struct component_ops imx_pd_ops = {
298 .bind = imx_pd_bind,
299 .unbind = imx_pd_unbind,
300};
301
302static int imx_pd_probe(struct platform_device *pdev)
303{
304 return component_add(&pdev->dev, &imx_pd_ops);
305}
306
307static int imx_pd_remove(struct platform_device *pdev)
308{
309 component_del(&pdev->dev, &imx_pd_ops);
310
311 return 0;
312}
313
314static const struct of_device_id imx_pd_dt_ids[] = {
315 { .compatible = "fsl,imx-parallel-display", },
316 { /* sentinel */ }
317};
318MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
319
320static struct platform_driver imx_pd_driver = {
321 .probe = imx_pd_probe,
322 .remove = imx_pd_remove,
323 .driver = {
324 .of_match_table = imx_pd_dt_ids,
325 .name = "imx-parallel-display",
326 },
327};
328
329module_platform_driver(imx_pd_driver);
330
331MODULE_DESCRIPTION("i.MX parallel display driver");
332MODULE_AUTHOR("Sascha Hauer, Pengutronix");
333MODULE_LICENSE("GPL");
334MODULE_ALIAS("platform:imx-parallel-display");