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 *companion;
39 struct device *dev;
40 struct imx_sc_ipc *ipc_handle;
41 u32 sc_resource;
42 u32 in_bus_format;
43 u32 out_bus_format;
44 u32 pl_sel;
45 };
46
47 #define bridge_to_p2d(b) container_of(b, struct imx8qxp_pxl2dpi, bridge)
48
imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge * bridge,struct drm_encoder * encoder,enum drm_bridge_attach_flags flags)49 static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
50 struct drm_encoder *encoder,
51 enum drm_bridge_attach_flags flags)
52 {
53 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
54
55 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
56 DRM_DEV_ERROR(p2d->dev,
57 "do not support creating a drm_connector\n");
58 return -EINVAL;
59 }
60
61 return drm_bridge_attach(encoder,
62 p2d->bridge.next_bridge, bridge,
63 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
64 }
65
imx8qxp_pxl2dpi_bridge_destroy(struct drm_bridge * bridge)66 static void imx8qxp_pxl2dpi_bridge_destroy(struct drm_bridge *bridge)
67 {
68 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
69
70 if (!p2d)
71 return;
72
73 drm_bridge_put(p2d->companion);
74 }
75
76 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)77 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
78 struct drm_bridge_state *bridge_state,
79 struct drm_crtc_state *crtc_state,
80 struct drm_connector_state *conn_state)
81 {
82 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
83
84 p2d->in_bus_format = bridge_state->input_bus_cfg.format;
85 p2d->out_bus_format = bridge_state->output_bus_cfg.format;
86
87 return 0;
88 }
89
90 static void
imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)91 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
92 const struct drm_display_mode *mode,
93 const struct drm_display_mode *adjusted_mode)
94 {
95 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
96 struct imx8qxp_pxl2dpi *companion_p2d;
97 int ret;
98
99 ret = pm_runtime_get_sync(p2d->dev);
100 if (ret < 0)
101 DRM_DEV_ERROR(p2d->dev,
102 "failed to get runtime PM sync: %d\n", ret);
103
104 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
105 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
106 if (ret)
107 DRM_DEV_ERROR(p2d->dev,
108 "failed to set pixel link selection(%u): %d\n",
109 p2d->pl_sel, ret);
110
111 switch (p2d->out_bus_format) {
112 case MEDIA_BUS_FMT_RGB888_1X24:
113 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
114 break;
115 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
116 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
117 break;
118 default:
119 DRM_DEV_ERROR(p2d->dev,
120 "unsupported output bus format 0x%08x\n",
121 p2d->out_bus_format);
122 }
123
124 if (p2d->companion) {
125 companion_p2d = bridge_to_p2d(p2d->companion);
126
127 companion_p2d->in_bus_format = p2d->in_bus_format;
128 companion_p2d->out_bus_format = p2d->out_bus_format;
129
130 p2d->companion->funcs->mode_set(p2d->companion, mode,
131 adjusted_mode);
132 }
133 }
134
imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_atomic_state * state)135 static void imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
136 struct drm_atomic_state *state)
137 {
138 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
139
140 pm_runtime_put(p2d->dev);
141
142 if (p2d->companion)
143 p2d->companion->funcs->atomic_disable(p2d->companion, state);
144 }
145
146 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
147 MEDIA_BUS_FMT_RGB888_1X24,
148 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
149 };
150
imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)151 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
152 {
153 int i;
154
155 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
156 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
157 return true;
158 }
159
160 return false;
161 }
162
163 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)164 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
165 struct drm_bridge_state *bridge_state,
166 struct drm_crtc_state *crtc_state,
167 struct drm_connector_state *conn_state,
168 u32 output_fmt,
169 unsigned int *num_input_fmts)
170 {
171 u32 *input_fmts;
172
173 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
174 return NULL;
175
176 *num_input_fmts = 1;
177
178 input_fmts = kmalloc_obj(*input_fmts);
179 if (!input_fmts)
180 return NULL;
181
182 switch (output_fmt) {
183 case MEDIA_BUS_FMT_RGB888_1X24:
184 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
185 break;
186 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
187 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
188 break;
189 default:
190 kfree(input_fmts);
191 input_fmts = NULL;
192 break;
193 }
194
195 return input_fmts;
196 }
197
198 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)199 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
200 struct drm_bridge_state *bridge_state,
201 struct drm_crtc_state *crtc_state,
202 struct drm_connector_state *conn_state,
203 unsigned int *num_output_fmts)
204 {
205 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
206 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
207 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
208 }
209
210 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
211 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
212 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
213 .atomic_reset = drm_atomic_helper_bridge_reset,
214 .attach = imx8qxp_pxl2dpi_bridge_attach,
215 .destroy = imx8qxp_pxl2dpi_bridge_destroy,
216 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
217 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
218 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
219 .atomic_get_input_bus_fmts =
220 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
221 .atomic_get_output_bus_fmts =
222 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
223 };
224
225 static int
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi * p2d,u32 port_id,struct device_node ** ep)226 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
227 u32 port_id,
228 struct device_node **ep)
229 {
230 struct device_node *port;
231 int ret = 0;
232 int ep_cnt;
233
234 *ep = NULL;
235
236 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
237 if (!port) {
238 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
239 return -ENODEV;
240 }
241
242 ep_cnt = of_get_available_child_count(port);
243 if (ep_cnt == 0) {
244 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
245 port_id);
246 ret = -ENODEV;
247 goto out;
248 } else if (ep_cnt > 1) {
249 DRM_DEV_ERROR(p2d->dev,
250 "invalid available endpoints of port@%u\n",
251 port_id);
252 ret = -EINVAL;
253 goto out;
254 }
255
256 *ep = of_get_next_available_child(port, NULL);
257 if (!*ep) {
258 DRM_DEV_ERROR(p2d->dev,
259 "failed to get available endpoint of port@%u\n",
260 port_id);
261 ret = -ENODEV;
262 goto out;
263 }
264 out:
265 of_node_put(port);
266 return ret;
267 }
268
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi * p2d)269 static int imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
270 {
271 struct device_node *ep __free(device_node) = NULL;
272 int ret;
273
274 ret = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1, &ep);
275 if (ret)
276 return ret;
277
278 struct device_node *remote __free(device_node) = of_graph_get_remote_port_parent(ep);
279 if (!remote || !of_device_is_available(remote)) {
280 DRM_DEV_ERROR(p2d->dev, "no available remote\n");
281 return -ENODEV;
282 } else if (!of_device_is_available(remote->parent)) {
283 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
284 return -ENODEV;
285 }
286
287 p2d->bridge.next_bridge = of_drm_find_and_get_bridge(remote);
288 if (!p2d->bridge.next_bridge)
289 return -EPROBE_DEFER;
290
291 return 0;
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 ret = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0, &ep);
301 if (ret)
302 return ret;
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_and_get_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->bridge.next_bridge->of_node, 1);
368 port2 = of_graph_get_port_by_id(companion_p2d->bridge.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 ret = imx8qxp_pxl2dpi_find_next_bridge(p2d);
425 if (ret)
426 return ret;
427
428 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
429 if (ret)
430 return ret;
431
432 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
433 if (ret)
434 return ret;
435
436 platform_set_drvdata(pdev, p2d);
437 pm_runtime_enable(dev);
438
439 p2d->bridge.driver_private = p2d;
440 p2d->bridge.of_node = np;
441
442 drm_bridge_add(&p2d->bridge);
443
444 return ret;
445 }
446
imx8qxp_pxl2dpi_bridge_remove(struct platform_device * pdev)447 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
448 {
449 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
450
451 drm_bridge_remove(&p2d->bridge);
452
453 pm_runtime_disable(&pdev->dev);
454 }
455
456 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
457 { .compatible = "fsl,imx8qxp-pxl2dpi", },
458 { /* sentinel */ }
459 };
460 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
461
462 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
463 .probe = imx8qxp_pxl2dpi_bridge_probe,
464 .remove = imx8qxp_pxl2dpi_bridge_remove,
465 .driver = {
466 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
467 .name = DRIVER_NAME,
468 },
469 };
470 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
471
472 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
473 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
474 MODULE_LICENSE("GPL v2");
475 MODULE_ALIAS("platform:" DRIVER_NAME);
476