1 // SPDX-License-Identifier: GPL-2.0+
2
3 /*
4 * Copyright 2020 NXP
5 */
6
7 #include <linux/firmware/imx/svc/misc.h>
8 #include <linux/media-bus-format.h>
9 #include <linux/mfd/syscon.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/of_device.h>
13 #include <linux/of_graph.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/regmap.h>
17
18 #include <drm/drm_atomic_state_helper.h>
19 #include <drm/drm_bridge.h>
20 #include <drm/drm_of.h>
21 #include <drm/drm_print.h>
22
23 #include <dt-bindings/firmware/imx/rsrc.h>
24
25 #define PXL2DPI_CTRL 0x40
26 #define CFG1_16BIT 0x0
27 #define CFG2_16BIT 0x1
28 #define CFG3_16BIT 0x2
29 #define CFG1_18BIT 0x3
30 #define CFG2_18BIT 0x4
31 #define CFG_24BIT 0x5
32
33 #define DRIVER_NAME "imx8qxp-pxl2dpi"
34
35 struct imx8qxp_pxl2dpi {
36 struct regmap *regmap;
37 struct drm_bridge bridge;
38 struct drm_bridge *next_bridge;
39 struct drm_bridge *companion;
40 struct device *dev;
41 struct imx_sc_ipc *ipc_handle;
42 u32 sc_resource;
43 u32 in_bus_format;
44 u32 out_bus_format;
45 u32 pl_sel;
46 };
47
48 #define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge)
49
imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge * bridge,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)50 static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
51 struct drm_encoder *encoder,
52 enum drm_bridge_attach_flags flags)
53 {
54 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
55
56 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
57 DRM_DEV_ERROR(p2d->dev,
58 "do not support creating a drm_connector\n");
59 return -EINVAL;
60 }
61
62 return drm_bridge_attach(encoder,
63 p2d->next_bridge, bridge,
64 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
65 }
66
67 static int
imx8qxp_pxl2dpi_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)68 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
69 struct drm_bridge_state *bridge_state,
70 struct drm_crtc_state *crtc_state,
71 struct drm_connector_state *conn_state)
72 {
73 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
74
75 p2d->in_bus_format = bridge_state->input_bus_cfg.format;
76 p2d->out_bus_format = bridge_state->output_bus_cfg.format;
77
78 return 0;
79 }
80
81 static void
imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)82 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
83 const struct drm_display_mode *mode,
84 const struct drm_display_mode *adjusted_mode)
85 {
86 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
87 struct imx8qxp_pxl2dpi *companion_p2d;
88 int ret;
89
90 ret = pm_runtime_get_sync(p2d->dev);
91 if (ret < 0)
92 DRM_DEV_ERROR(p2d->dev,
93 "failed to get runtime PM sync: %d\n", ret);
94
95 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
96 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
97 if (ret)
98 DRM_DEV_ERROR(p2d->dev,
99 "failed to set pixel link selection(%u): %d\n",
100 p2d->pl_sel, ret);
101
102 switch (p2d->out_bus_format) {
103 case MEDIA_BUS_FMT_RGB888_1X24:
104 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
105 break;
106 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
107 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
108 break;
109 default:
110 DRM_DEV_ERROR(p2d->dev,
111 "unsupported output bus format 0x%08x\n",
112 p2d->out_bus_format);
113 }
114
115 if (p2d->companion) {
116 companion_p2d = bridge_to_p2d(p2d->companion);
117
118 companion_p2d->in_bus_format = p2d->in_bus_format;
119 companion_p2d->out_bus_format = p2d->out_bus_format;
120
121 p2d->companion->funcs->mode_set(p2d->companion, mode,
122 adjusted_mode);
123 }
124 }
125
imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_atomic_state * state)126 static void imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
127 struct drm_atomic_state *state)
128 {
129 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
130 int ret;
131
132 ret = pm_runtime_put(p2d->dev);
133 if (ret < 0)
134 DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
135
136 if (p2d->companion)
137 p2d->companion->funcs->atomic_disable(p2d->companion, state);
138 }
139
140 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
141 MEDIA_BUS_FMT_RGB888_1X24,
142 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
143 };
144
imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)145 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
146 {
147 int i;
148
149 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
150 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
151 return true;
152 }
153
154 return false;
155 }
156
157 static u32 *
imx8qxp_pxl2dpi_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 imx8qxp_pxl2dpi_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 u32 *input_fmts;
166
167 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
168 return NULL;
169
170 *num_input_fmts = 1;
171
172 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
173 if (!input_fmts)
174 return NULL;
175
176 switch (output_fmt) {
177 case MEDIA_BUS_FMT_RGB888_1X24:
178 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
179 break;
180 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
181 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
182 break;
183 default:
184 kfree(input_fmts);
185 input_fmts = NULL;
186 break;
187 }
188
189 return input_fmts;
190 }
191
192 static u32 *
imx8qxp_pxl2dpi_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)193 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
194 struct drm_bridge_state *bridge_state,
195 struct drm_crtc_state *crtc_state,
196 struct drm_connector_state *conn_state,
197 unsigned int *num_output_fmts)
198 {
199 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
200 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
201 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
202 }
203
204 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
205 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
206 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
207 .atomic_reset = drm_atomic_helper_bridge_reset,
208 .attach = imx8qxp_pxl2dpi_bridge_attach,
209 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
210 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
211 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
212 .atomic_get_input_bus_fmts =
213 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
214 .atomic_get_output_bus_fmts =
215 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
216 };
217
218 static struct device_node *
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi * p2d,u32 port_id)219 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
220 u32 port_id)
221 {
222 struct device_node *port, *ep;
223 int ep_cnt;
224
225 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
226 if (!port) {
227 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
228 return ERR_PTR(-ENODEV);
229 }
230
231 ep_cnt = of_get_available_child_count(port);
232 if (ep_cnt == 0) {
233 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
234 port_id);
235 ep = ERR_PTR(-ENODEV);
236 goto out;
237 } else if (ep_cnt > 1) {
238 DRM_DEV_ERROR(p2d->dev,
239 "invalid available endpoints of port@%u\n",
240 port_id);
241 ep = ERR_PTR(-EINVAL);
242 goto out;
243 }
244
245 ep = of_get_next_available_child(port, NULL);
246 if (!ep) {
247 DRM_DEV_ERROR(p2d->dev,
248 "failed to get available endpoint of port@%u\n",
249 port_id);
250 ep = ERR_PTR(-ENODEV);
251 goto out;
252 }
253 out:
254 of_node_put(port);
255 return ep;
256 }
257
258 static struct drm_bridge *
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi * p2d)259 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
260 {
261 struct device_node *ep, *remote;
262 struct drm_bridge *next_bridge;
263 int ret;
264
265 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
266 if (IS_ERR(ep)) {
267 ret = PTR_ERR(ep);
268 return ERR_PTR(ret);
269 }
270
271 remote = of_graph_get_remote_port_parent(ep);
272 if (!remote || !of_device_is_available(remote)) {
273 DRM_DEV_ERROR(p2d->dev, "no available remote\n");
274 next_bridge = ERR_PTR(-ENODEV);
275 goto out;
276 } else if (!of_device_is_available(remote->parent)) {
277 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
278 next_bridge = ERR_PTR(-ENODEV);
279 goto out;
280 }
281
282 next_bridge = of_drm_find_bridge(remote);
283 if (!next_bridge) {
284 next_bridge = ERR_PTR(-EPROBE_DEFER);
285 goto out;
286 }
287 out:
288 of_node_put(remote);
289 of_node_put(ep);
290
291 return next_bridge;
292 }
293
imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi * p2d)294 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
295 {
296 struct device_node *ep;
297 struct of_endpoint endpoint;
298 int ret;
299
300 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
301 if (IS_ERR(ep))
302 return PTR_ERR(ep);
303
304 ret = of_graph_parse_endpoint(ep, &endpoint);
305 if (ret) {
306 DRM_DEV_ERROR(p2d->dev,
307 "failed to parse endpoint of port@0: %d\n", ret);
308 goto out;
309 }
310
311 p2d->pl_sel = endpoint.id;
312 out:
313 of_node_put(ep);
314
315 return ret;
316 }
317
imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi * p2d)318 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
319 {
320 struct imx8qxp_pxl2dpi *companion_p2d;
321 struct device *dev = p2d->dev;
322 struct device_node *companion;
323 struct device_node *port1, *port2;
324 const struct of_device_id *match;
325 int dual_link;
326 int ret = 0;
327
328 /* Locate the companion PXL2DPI for dual-link operation, if any. */
329 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
330 if (!companion)
331 return 0;
332
333 if (!of_device_is_available(companion)) {
334 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
335 ret = -ENODEV;
336 goto out;
337 }
338
339 /*
340 * Sanity check: the companion bridge must have the same compatible
341 * string.
342 */
343 match = of_match_device(dev->driver->of_match_table, dev);
344 if (!of_device_is_compatible(companion, match->compatible)) {
345 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
346 ret = -ENXIO;
347 goto out;
348 }
349
350 p2d->companion = of_drm_find_bridge(companion);
351 if (!p2d->companion) {
352 ret = -EPROBE_DEFER;
353 DRM_DEV_DEBUG_DRIVER(p2d->dev,
354 "failed to find companion bridge: %d\n",
355 ret);
356 goto out;
357 }
358
359 companion_p2d = bridge_to_p2d(p2d->companion);
360
361 /*
362 * We need to work out if the sink is expecting us to function in
363 * dual-link mode. We do this by looking at the DT port nodes that
364 * the next bridges are connected to. If they are marked as expecting
365 * even pixels and odd pixels than we need to use the companion PXL2DPI.
366 */
367 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
368 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
369 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
370 of_node_put(port1);
371 of_node_put(port2);
372
373 if (dual_link < 0) {
374 ret = dual_link;
375 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
376 ret);
377 goto out;
378 }
379
380 DRM_DEV_DEBUG_DRIVER(dev,
381 "dual-link configuration detected (companion bridge %pOF)\n",
382 companion);
383 out:
384 of_node_put(companion);
385 return ret;
386 }
387
imx8qxp_pxl2dpi_bridge_probe(struct platform_device * pdev)388 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
389 {
390 struct imx8qxp_pxl2dpi *p2d;
391 struct device *dev = &pdev->dev;
392 struct device_node *np = dev->of_node;
393 int ret;
394
395 p2d = devm_drm_bridge_alloc(dev, struct imx8qxp_pxl2dpi, bridge,
396 &imx8qxp_pxl2dpi_bridge_funcs);
397 if (IS_ERR(p2d))
398 return PTR_ERR(p2d);
399
400 p2d->regmap = syscon_node_to_regmap(np->parent);
401 if (IS_ERR(p2d->regmap)) {
402 ret = PTR_ERR(p2d->regmap);
403 if (ret != -EPROBE_DEFER)
404 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
405 return ret;
406 }
407
408 ret = imx_scu_get_handle(&p2d->ipc_handle);
409 if (ret) {
410 if (ret != -EPROBE_DEFER)
411 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
412 ret);
413 return ret;
414 }
415
416 p2d->dev = dev;
417
418 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
419 if (ret) {
420 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
421 return ret;
422 }
423
424 p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
425 if (IS_ERR(p2d->next_bridge)) {
426 ret = PTR_ERR(p2d->next_bridge);
427 if (ret != -EPROBE_DEFER)
428 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
429 ret);
430 return ret;
431 }
432
433 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
434 if (ret)
435 return ret;
436
437 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
438 if (ret)
439 return ret;
440
441 platform_set_drvdata(pdev, p2d);
442 pm_runtime_enable(dev);
443
444 p2d->bridge.driver_private = p2d;
445 p2d->bridge.of_node = np;
446
447 drm_bridge_add(&p2d->bridge);
448
449 return ret;
450 }
451
imx8qxp_pxl2dpi_bridge_remove(struct platform_device * pdev)452 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
453 {
454 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
455
456 drm_bridge_remove(&p2d->bridge);
457
458 pm_runtime_disable(&pdev->dev);
459 }
460
461 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
462 { .compatible = "fsl,imx8qxp-pxl2dpi", },
463 { /* sentinel */ }
464 };
465 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
466
467 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
468 .probe = imx8qxp_pxl2dpi_bridge_probe,
469 .remove = imx8qxp_pxl2dpi_bridge_remove,
470 .driver = {
471 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
472 .name = DRIVER_NAME,
473 },
474 };
475 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
476
477 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
478 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
479 MODULE_LICENSE("GPL v2");
480 MODULE_ALIAS("platform:" DRIVER_NAME);
481