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_bridge.h>
17 #include <drm/drm_fb_helper.h>
18 #include <drm/drm_of.h>
19 #include <drm/drm_panel.h>
20 #include <drm/drm_probe_helper.h>
21 #include <drm/drm_simple_kms_helper.h>
22
23 #include "imx-drm.h"
24
25 struct imx_parallel_display {
26 struct drm_connector connector;
27 struct drm_encoder encoder;
28 struct drm_bridge bridge;
29 struct device *dev;
30 void *edid;
31 u32 bus_format;
32 u32 bus_flags;
33 struct drm_display_mode mode;
34 struct drm_panel *panel;
35 struct drm_bridge *next_bridge;
36 };
37
con_to_imxpd(struct drm_connector * c)38 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
39 {
40 return container_of(c, struct imx_parallel_display, connector);
41 }
42
bridge_to_imxpd(struct drm_bridge * b)43 static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
44 {
45 return container_of(b, struct imx_parallel_display, bridge);
46 }
47
imx_pd_connector_get_modes(struct drm_connector * connector)48 static int imx_pd_connector_get_modes(struct drm_connector *connector)
49 {
50 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
51 struct device_node *np = imxpd->dev->of_node;
52 int num_modes;
53
54 num_modes = drm_panel_get_modes(imxpd->panel, connector);
55 if (num_modes > 0)
56 return num_modes;
57
58 if (imxpd->edid) {
59 drm_connector_update_edid_property(connector, imxpd->edid);
60 num_modes = drm_add_edid_modes(connector, imxpd->edid);
61 }
62
63 if (np) {
64 struct drm_display_mode *mode = drm_mode_create(connector->dev);
65 int ret;
66
67 if (!mode)
68 return -EINVAL;
69
70 ret = of_get_drm_display_mode(np, &imxpd->mode,
71 &imxpd->bus_flags,
72 OF_USE_NATIVE_MODE);
73 if (ret)
74 return ret;
75
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 return num_modes;
83 }
84
imx_pd_bridge_enable(struct drm_bridge * bridge)85 static void imx_pd_bridge_enable(struct drm_bridge *bridge)
86 {
87 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
88
89 drm_panel_prepare(imxpd->panel);
90 drm_panel_enable(imxpd->panel);
91 }
92
imx_pd_bridge_disable(struct drm_bridge * bridge)93 static void imx_pd_bridge_disable(struct drm_bridge *bridge)
94 {
95 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
96
97 drm_panel_disable(imxpd->panel);
98 drm_panel_unprepare(imxpd->panel);
99 }
100
101 static const u32 imx_pd_bus_fmts[] = {
102 MEDIA_BUS_FMT_RGB888_1X24,
103 MEDIA_BUS_FMT_BGR888_1X24,
104 MEDIA_BUS_FMT_GBR888_1X24,
105 MEDIA_BUS_FMT_RGB666_1X18,
106 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
107 MEDIA_BUS_FMT_RGB565_1X16,
108 };
109
110 static u32 *
imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state,unsigned int * num_output_fmts)111 imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
112 struct drm_bridge_state *bridge_state,
113 struct drm_crtc_state *crtc_state,
114 struct drm_connector_state *conn_state,
115 unsigned int *num_output_fmts)
116 {
117 struct drm_display_info *di = &conn_state->connector->display_info;
118 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
119 u32 *output_fmts;
120
121 if (!imxpd->bus_format && !di->num_bus_formats) {
122 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
123 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
124 GFP_KERNEL);
125 }
126
127 *num_output_fmts = 1;
128 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
129 if (!output_fmts)
130 return NULL;
131
132 if (!imxpd->bus_format && di->num_bus_formats)
133 output_fmts[0] = di->bus_formats[0];
134 else
135 output_fmts[0] = imxpd->bus_format;
136
137 return output_fmts;
138 }
139
imx_pd_format_supported(u32 output_fmt)140 static bool imx_pd_format_supported(u32 output_fmt)
141 {
142 unsigned int i;
143
144 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
145 if (imx_pd_bus_fmts[i] == output_fmt)
146 return true;
147 }
148
149 return false;
150 }
151
152 static u32 *
imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state,u32 output_fmt,unsigned int * num_input_fmts)153 imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
154 struct drm_bridge_state *bridge_state,
155 struct drm_crtc_state *crtc_state,
156 struct drm_connector_state *conn_state,
157 u32 output_fmt,
158 unsigned int *num_input_fmts)
159 {
160 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
161 u32 *input_fmts;
162
163 /*
164 * If the next bridge does not support bus format negotiation, let's
165 * use the static bus format definition (imxpd->bus_format) if it's
166 * specified, RGB888 when it's not.
167 */
168 if (output_fmt == MEDIA_BUS_FMT_FIXED)
169 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
170
171 /* Now make sure the requested output format is supported. */
172 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
173 !imx_pd_format_supported(output_fmt)) {
174 *num_input_fmts = 0;
175 return NULL;
176 }
177
178 *num_input_fmts = 1;
179 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
180 if (!input_fmts)
181 return NULL;
182
183 input_fmts[0] = output_fmt;
184 return input_fmts;
185 }
186
imx_pd_bridge_atomic_check(struct drm_bridge * bridge,struct drm_bridge_state * bridge_state,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)187 static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
188 struct drm_bridge_state *bridge_state,
189 struct drm_crtc_state *crtc_state,
190 struct drm_connector_state *conn_state)
191 {
192 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
193 struct drm_display_info *di = &conn_state->connector->display_info;
194 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
195 struct drm_bridge_state *next_bridge_state = NULL;
196 struct drm_bridge *next_bridge;
197 u32 bus_flags, bus_fmt;
198
199 next_bridge = drm_bridge_get_next_bridge(bridge);
200 if (next_bridge)
201 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
202 next_bridge);
203
204 if (next_bridge_state)
205 bus_flags = next_bridge_state->input_bus_cfg.flags;
206 else if (di->num_bus_formats)
207 bus_flags = di->bus_flags;
208 else
209 bus_flags = imxpd->bus_flags;
210
211 bus_fmt = bridge_state->input_bus_cfg.format;
212 if (!imx_pd_format_supported(bus_fmt))
213 return -EINVAL;
214
215 if (bus_flags &
216 ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
217 DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
218 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
219 dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
220 return -EINVAL;
221 }
222
223 bridge_state->output_bus_cfg.flags = bus_flags;
224 bridge_state->input_bus_cfg.flags = bus_flags;
225 imx_crtc_state->bus_flags = bus_flags;
226 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
227 imx_crtc_state->di_hsync_pin = 2;
228 imx_crtc_state->di_vsync_pin = 3;
229
230 return 0;
231 }
232
233 static const struct drm_connector_funcs imx_pd_connector_funcs = {
234 .fill_modes = drm_helper_probe_single_connector_modes,
235 .destroy = imx_drm_connector_destroy,
236 .reset = drm_atomic_helper_connector_reset,
237 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
238 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
239 };
240
241 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
242 .get_modes = imx_pd_connector_get_modes,
243 };
244
245 static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
246 .enable = imx_pd_bridge_enable,
247 .disable = imx_pd_bridge_disable,
248 .atomic_reset = drm_atomic_helper_bridge_reset,
249 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
250 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
251 .atomic_check = imx_pd_bridge_atomic_check,
252 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
253 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
254 };
255
imx_pd_register(struct drm_device * drm,struct imx_parallel_display * imxpd)256 static int imx_pd_register(struct drm_device *drm,
257 struct imx_parallel_display *imxpd)
258 {
259 struct drm_encoder *encoder = &imxpd->encoder;
260 int ret;
261
262 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
263 if (ret)
264 return ret;
265
266 /* set the connector's dpms to OFF so that
267 * drm_helper_connector_dpms() won't return
268 * immediately since the current state is ON
269 * at this point.
270 */
271 imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
272
273 drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE);
274
275 imxpd->bridge.funcs = &imx_pd_bridge_funcs;
276 drm_bridge_attach(encoder, &imxpd->bridge, NULL, 0);
277
278 if (!imxpd->next_bridge) {
279 drm_connector_helper_add(&imxpd->connector,
280 &imx_pd_connector_helper_funcs);
281 drm_connector_init(drm, &imxpd->connector,
282 &imx_pd_connector_funcs,
283 DRM_MODE_CONNECTOR_DPI);
284 }
285
286 if (imxpd->next_bridge) {
287 ret = drm_bridge_attach(encoder, imxpd->next_bridge,
288 &imxpd->bridge, 0);
289 if (ret < 0) {
290 dev_err(imxpd->dev, "failed to attach bridge: %d\n",
291 ret);
292 return ret;
293 }
294 } else {
295 drm_connector_attach_encoder(&imxpd->connector, encoder);
296 }
297
298 return 0;
299 }
300
imx_pd_bind(struct device * dev,struct device * master,void * data)301 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
302 {
303 struct drm_device *drm = data;
304 struct device_node *np = dev->of_node;
305 const u8 *edidp;
306 struct imx_parallel_display *imxpd;
307 int edid_len;
308 int ret;
309 u32 bus_format = 0;
310 const char *fmt;
311
312 imxpd = dev_get_drvdata(dev);
313 memset(imxpd, 0, sizeof(*imxpd));
314
315 /* port@1 is the output port */
316 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
317 &imxpd->next_bridge);
318 if (ret && ret != -ENODEV)
319 return ret;
320
321 edidp = of_get_property(np, "edid", &edid_len);
322 if (edidp)
323 imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);
324
325 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
326 if (!ret) {
327 if (!strcmp(fmt, "rgb24"))
328 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
329 else if (!strcmp(fmt, "rgb565"))
330 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
331 else if (!strcmp(fmt, "bgr666"))
332 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
333 else if (!strcmp(fmt, "lvds666"))
334 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
335 }
336 imxpd->bus_format = bus_format;
337
338 imxpd->dev = dev;
339
340 ret = imx_pd_register(drm, imxpd);
341 if (ret)
342 return ret;
343
344 return 0;
345 }
346
347 static const struct component_ops imx_pd_ops = {
348 .bind = imx_pd_bind,
349 };
350
imx_pd_probe(struct platform_device * pdev)351 static int imx_pd_probe(struct platform_device *pdev)
352 {
353 struct imx_parallel_display *imxpd;
354
355 imxpd = devm_kzalloc(&pdev->dev, sizeof(*imxpd), GFP_KERNEL);
356 if (!imxpd)
357 return -ENOMEM;
358
359 platform_set_drvdata(pdev, imxpd);
360
361 return component_add(&pdev->dev, &imx_pd_ops);
362 }
363
imx_pd_remove(struct platform_device * pdev)364 static int imx_pd_remove(struct platform_device *pdev)
365 {
366 component_del(&pdev->dev, &imx_pd_ops);
367
368 return 0;
369 }
370
371 static const struct of_device_id imx_pd_dt_ids[] = {
372 { .compatible = "fsl,imx-parallel-display", },
373 { /* sentinel */ }
374 };
375 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
376
377 static struct platform_driver imx_pd_driver = {
378 .probe = imx_pd_probe,
379 .remove = imx_pd_remove,
380 .driver = {
381 .of_match_table = imx_pd_dt_ids,
382 .name = "imx-parallel-display",
383 },
384 };
385
386 module_platform_driver(imx_pd_driver);
387
388 MODULE_DESCRIPTION("i.MX parallel display driver");
389 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
390 MODULE_LICENSE("GPL");
391 MODULE_ALIAS("platform:imx-parallel-display");
392