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_managed.h>
19 #include <drm/drm_of.h>
20 #include <drm/drm_panel.h>
21 #include <drm/drm_probe_helper.h>
22 #include <drm/drm_simple_kms_helper.h>
23
24 #include "imx-drm.h"
25
26 struct imx_parallel_display_encoder {
27 struct drm_connector connector;
28 struct drm_encoder encoder;
29 struct drm_bridge bridge;
30 struct imx_parallel_display *pd;
31 };
32
33 struct imx_parallel_display {
34 struct device *dev;
35 void *edid;
36 u32 bus_format;
37 u32 bus_flags;
38 struct drm_display_mode mode;
39 struct drm_panel *panel;
40 struct drm_bridge *next_bridge;
41 };
42
con_to_imxpd(struct drm_connector * c)43 static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
44 {
45 return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
46 }
47
bridge_to_imxpd(struct drm_bridge * b)48 static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
49 {
50 return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
51 }
52
imx_pd_connector_get_modes(struct drm_connector * connector)53 static int imx_pd_connector_get_modes(struct drm_connector *connector)
54 {
55 struct imx_parallel_display *imxpd = con_to_imxpd(connector);
56 struct device_node *np = imxpd->dev->of_node;
57 int num_modes;
58
59 num_modes = drm_panel_get_modes(imxpd->panel, connector);
60 if (num_modes > 0)
61 return num_modes;
62
63 if (imxpd->edid) {
64 drm_connector_update_edid_property(connector, imxpd->edid);
65 num_modes = drm_add_edid_modes(connector, imxpd->edid);
66 }
67
68 if (np) {
69 struct drm_display_mode *mode = drm_mode_create(connector->dev);
70 int ret;
71
72 if (!mode)
73 return -EINVAL;
74
75 ret = of_get_drm_display_mode(np, &imxpd->mode,
76 &imxpd->bus_flags,
77 OF_USE_NATIVE_MODE);
78 if (ret)
79 return ret;
80
81 drm_mode_copy(mode, &imxpd->mode);
82 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
83 drm_mode_probed_add(connector, mode);
84 num_modes++;
85 }
86
87 return num_modes;
88 }
89
imx_pd_bridge_enable(struct drm_bridge * bridge)90 static void imx_pd_bridge_enable(struct drm_bridge *bridge)
91 {
92 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
93
94 drm_panel_prepare(imxpd->panel);
95 drm_panel_enable(imxpd->panel);
96 }
97
imx_pd_bridge_disable(struct drm_bridge * bridge)98 static void imx_pd_bridge_disable(struct drm_bridge *bridge)
99 {
100 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
101
102 drm_panel_disable(imxpd->panel);
103 drm_panel_unprepare(imxpd->panel);
104 }
105
106 static const u32 imx_pd_bus_fmts[] = {
107 MEDIA_BUS_FMT_RGB888_1X24,
108 MEDIA_BUS_FMT_BGR888_1X24,
109 MEDIA_BUS_FMT_GBR888_1X24,
110 MEDIA_BUS_FMT_RGB666_1X18,
111 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
112 MEDIA_BUS_FMT_RGB565_1X16,
113 };
114
115 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)116 imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
117 struct drm_bridge_state *bridge_state,
118 struct drm_crtc_state *crtc_state,
119 struct drm_connector_state *conn_state,
120 unsigned int *num_output_fmts)
121 {
122 struct drm_display_info *di = &conn_state->connector->display_info;
123 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
124 u32 *output_fmts;
125
126 if (!imxpd->bus_format && !di->num_bus_formats) {
127 *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
128 return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
129 GFP_KERNEL);
130 }
131
132 *num_output_fmts = 1;
133 output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
134 if (!output_fmts)
135 return NULL;
136
137 if (!imxpd->bus_format && di->num_bus_formats)
138 output_fmts[0] = di->bus_formats[0];
139 else
140 output_fmts[0] = imxpd->bus_format;
141
142 return output_fmts;
143 }
144
imx_pd_format_supported(u32 output_fmt)145 static bool imx_pd_format_supported(u32 output_fmt)
146 {
147 unsigned int i;
148
149 for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
150 if (imx_pd_bus_fmts[i] == output_fmt)
151 return true;
152 }
153
154 return false;
155 }
156
157 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)158 imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
159 struct drm_bridge_state *bridge_state,
160 struct drm_crtc_state *crtc_state,
161 struct drm_connector_state *conn_state,
162 u32 output_fmt,
163 unsigned int *num_input_fmts)
164 {
165 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
166 u32 *input_fmts;
167
168 /*
169 * If the next bridge does not support bus format negotiation, let's
170 * use the static bus format definition (imxpd->bus_format) if it's
171 * specified, RGB888 when it's not.
172 */
173 if (output_fmt == MEDIA_BUS_FMT_FIXED)
174 output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
175
176 /* Now make sure the requested output format is supported. */
177 if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
178 !imx_pd_format_supported(output_fmt)) {
179 *num_input_fmts = 0;
180 return NULL;
181 }
182
183 *num_input_fmts = 1;
184 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
185 if (!input_fmts)
186 return NULL;
187
188 input_fmts[0] = output_fmt;
189 return input_fmts;
190 }
191
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)192 static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
193 struct drm_bridge_state *bridge_state,
194 struct drm_crtc_state *crtc_state,
195 struct drm_connector_state *conn_state)
196 {
197 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
198 struct drm_display_info *di = &conn_state->connector->display_info;
199 struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
200 struct drm_bridge_state *next_bridge_state = NULL;
201 struct drm_bridge *next_bridge;
202 u32 bus_flags, bus_fmt;
203
204 next_bridge = drm_bridge_get_next_bridge(bridge);
205 if (next_bridge)
206 next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
207 next_bridge);
208
209 if (next_bridge_state)
210 bus_flags = next_bridge_state->input_bus_cfg.flags;
211 else if (di->num_bus_formats)
212 bus_flags = di->bus_flags;
213 else
214 bus_flags = imxpd->bus_flags;
215
216 bus_fmt = bridge_state->input_bus_cfg.format;
217 if (!imx_pd_format_supported(bus_fmt))
218 return -EINVAL;
219
220 if (bus_flags &
221 ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
222 DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
223 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
224 dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
225 return -EINVAL;
226 }
227
228 bridge_state->output_bus_cfg.flags = bus_flags;
229 bridge_state->input_bus_cfg.flags = bus_flags;
230 imx_crtc_state->bus_flags = bus_flags;
231 imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
232 imx_crtc_state->di_hsync_pin = 2;
233 imx_crtc_state->di_vsync_pin = 3;
234
235 return 0;
236 }
237
238 static const struct drm_connector_funcs imx_pd_connector_funcs = {
239 .fill_modes = drm_helper_probe_single_connector_modes,
240 .destroy = imx_drm_connector_destroy,
241 .reset = drm_atomic_helper_connector_reset,
242 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
243 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
244 };
245
246 static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
247 .get_modes = imx_pd_connector_get_modes,
248 };
249
250 static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
251 .enable = imx_pd_bridge_enable,
252 .disable = imx_pd_bridge_disable,
253 .atomic_reset = drm_atomic_helper_bridge_reset,
254 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
255 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
256 .atomic_check = imx_pd_bridge_atomic_check,
257 .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
258 .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
259 };
260
imx_pd_bind(struct device * dev,struct device * master,void * data)261 static int imx_pd_bind(struct device *dev, struct device *master, void *data)
262 {
263 struct drm_device *drm = data;
264 struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
265 struct imx_parallel_display_encoder *imxpd_encoder;
266 struct drm_connector *connector;
267 struct drm_encoder *encoder;
268 struct drm_bridge *bridge;
269 int ret;
270
271 imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
272 encoder, DRM_MODE_ENCODER_NONE);
273 if (IS_ERR(imxpd_encoder))
274 return PTR_ERR(imxpd_encoder);
275
276 imxpd_encoder->pd = imxpd;
277 connector = &imxpd_encoder->connector;
278 encoder = &imxpd_encoder->encoder;
279 bridge = &imxpd_encoder->bridge;
280
281 ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
282 if (ret)
283 return ret;
284
285 /* set the connector's dpms to OFF so that
286 * drm_helper_connector_dpms() won't return
287 * immediately since the current state is ON
288 * at this point.
289 */
290 connector->dpms = DRM_MODE_DPMS_OFF;
291
292 bridge->funcs = &imx_pd_bridge_funcs;
293 drm_bridge_attach(encoder, bridge, NULL, 0);
294
295 if (imxpd->next_bridge) {
296 ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
297 if (ret < 0)
298 return ret;
299 } else {
300 drm_connector_helper_add(connector,
301 &imx_pd_connector_helper_funcs);
302 drm_connector_init(drm, connector, &imx_pd_connector_funcs,
303 DRM_MODE_CONNECTOR_DPI);
304
305 drm_connector_attach_encoder(connector, encoder);
306 }
307
308 return 0;
309 }
310
311 static const struct component_ops imx_pd_ops = {
312 .bind = imx_pd_bind,
313 };
314
imx_pd_probe(struct platform_device * pdev)315 static int imx_pd_probe(struct platform_device *pdev)
316 {
317 struct device *dev = &pdev->dev;
318 struct device_node *np = dev->of_node;
319 const u8 *edidp;
320 struct imx_parallel_display *imxpd;
321 int edid_len;
322 int ret;
323 u32 bus_format = 0;
324 const char *fmt;
325
326 imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
327 if (!imxpd)
328 return -ENOMEM;
329
330 /* port@1 is the output port */
331 ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
332 &imxpd->next_bridge);
333 if (ret && ret != -ENODEV)
334 return ret;
335
336 edidp = of_get_property(np, "edid", &edid_len);
337 if (edidp)
338 imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);
339
340 ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
341 if (!ret) {
342 if (!strcmp(fmt, "rgb24"))
343 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
344 else if (!strcmp(fmt, "rgb565"))
345 bus_format = MEDIA_BUS_FMT_RGB565_1X16;
346 else if (!strcmp(fmt, "bgr666"))
347 bus_format = MEDIA_BUS_FMT_RGB666_1X18;
348 else if (!strcmp(fmt, "lvds666"))
349 bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
350 }
351 imxpd->bus_format = bus_format;
352
353 imxpd->dev = dev;
354
355 platform_set_drvdata(pdev, imxpd);
356
357 return component_add(dev, &imx_pd_ops);
358 }
359
imx_pd_remove(struct platform_device * pdev)360 static int imx_pd_remove(struct platform_device *pdev)
361 {
362 component_del(&pdev->dev, &imx_pd_ops);
363
364 return 0;
365 }
366
367 static const struct of_device_id imx_pd_dt_ids[] = {
368 { .compatible = "fsl,imx-parallel-display", },
369 { /* sentinel */ }
370 };
371 MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
372
373 static struct platform_driver imx_pd_driver = {
374 .probe = imx_pd_probe,
375 .remove = imx_pd_remove,
376 .driver = {
377 .of_match_table = imx_pd_dt_ids,
378 .name = "imx-parallel-display",
379 },
380 };
381
382 module_platform_driver(imx_pd_driver);
383
384 MODULE_DESCRIPTION("i.MX parallel display driver");
385 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
386 MODULE_LICENSE("GPL");
387 MODULE_ALIAS("platform:imx-parallel-display");
388