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,enum drm_bridge_attach_flags flags)50 static int imx8qxp_pxl2dpi_bridge_attach(struct drm_bridge *bridge,
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(bridge->encoder,
62 p2d->next_bridge, bridge,
63 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
64 }
65
66 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)67 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
68 struct drm_bridge_state *bridge_state,
69 struct drm_crtc_state *crtc_state,
70 struct drm_connector_state *conn_state)
71 {
72 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
73
74 p2d->in_bus_format = bridge_state->input_bus_cfg.format;
75 p2d->out_bus_format = bridge_state->output_bus_cfg.format;
76
77 return 0;
78 }
79
80 static void
imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)81 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
82 const struct drm_display_mode *mode,
83 const struct drm_display_mode *adjusted_mode)
84 {
85 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
86 struct imx8qxp_pxl2dpi *companion_p2d;
87 int ret;
88
89 ret = pm_runtime_get_sync(p2d->dev);
90 if (ret < 0)
91 DRM_DEV_ERROR(p2d->dev,
92 "failed to get runtime PM sync: %d\n", ret);
93
94 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
95 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
96 if (ret)
97 DRM_DEV_ERROR(p2d->dev,
98 "failed to set pixel link selection(%u): %d\n",
99 p2d->pl_sel, ret);
100
101 switch (p2d->out_bus_format) {
102 case MEDIA_BUS_FMT_RGB888_1X24:
103 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
104 break;
105 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
106 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
107 break;
108 default:
109 DRM_DEV_ERROR(p2d->dev,
110 "unsupported output bus format 0x%08x\n",
111 p2d->out_bus_format);
112 }
113
114 if (p2d->companion) {
115 companion_p2d = bridge_to_p2d(p2d->companion);
116
117 companion_p2d->in_bus_format = p2d->in_bus_format;
118 companion_p2d->out_bus_format = p2d->out_bus_format;
119
120 p2d->companion->funcs->mode_set(p2d->companion, mode,
121 adjusted_mode);
122 }
123 }
124
125 static void
imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)126 imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
127 struct drm_bridge_state *old_bridge_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,
138 old_bridge_state);
139 }
140
141 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
142 MEDIA_BUS_FMT_RGB888_1X24,
143 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
144 };
145
imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)146 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
147 {
148 int i;
149
150 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
151 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
152 return true;
153 }
154
155 return false;
156 }
157
158 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)159 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
160 struct drm_bridge_state *bridge_state,
161 struct drm_crtc_state *crtc_state,
162 struct drm_connector_state *conn_state,
163 u32 output_fmt,
164 unsigned int *num_input_fmts)
165 {
166 u32 *input_fmts;
167
168 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
169 return NULL;
170
171 *num_input_fmts = 1;
172
173 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
174 if (!input_fmts)
175 return NULL;
176
177 switch (output_fmt) {
178 case MEDIA_BUS_FMT_RGB888_1X24:
179 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
180 break;
181 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
182 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
183 break;
184 default:
185 kfree(input_fmts);
186 input_fmts = NULL;
187 break;
188 }
189
190 return input_fmts;
191 }
192
193 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)194 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
195 struct drm_bridge_state *bridge_state,
196 struct drm_crtc_state *crtc_state,
197 struct drm_connector_state *conn_state,
198 unsigned int *num_output_fmts)
199 {
200 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
201 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
202 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
203 }
204
205 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
206 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
207 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
208 .atomic_reset = drm_atomic_helper_bridge_reset,
209 .attach = imx8qxp_pxl2dpi_bridge_attach,
210 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
211 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
212 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
213 .atomic_get_input_bus_fmts =
214 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
215 .atomic_get_output_bus_fmts =
216 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
217 };
218
219 static struct device_node *
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi * p2d,u32 port_id)220 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
221 u32 port_id)
222 {
223 struct device_node *port, *ep;
224 int ep_cnt;
225
226 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
227 if (!port) {
228 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
229 return ERR_PTR(-ENODEV);
230 }
231
232 ep_cnt = of_get_available_child_count(port);
233 if (ep_cnt == 0) {
234 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
235 port_id);
236 ep = ERR_PTR(-ENODEV);
237 goto out;
238 } else if (ep_cnt > 1) {
239 DRM_DEV_ERROR(p2d->dev,
240 "invalid available endpoints of port@%u\n",
241 port_id);
242 ep = ERR_PTR(-EINVAL);
243 goto out;
244 }
245
246 ep = of_get_next_available_child(port, NULL);
247 if (!ep) {
248 DRM_DEV_ERROR(p2d->dev,
249 "failed to get available endpoint of port@%u\n",
250 port_id);
251 ep = ERR_PTR(-ENODEV);
252 goto out;
253 }
254 out:
255 of_node_put(port);
256 return ep;
257 }
258
259 static struct drm_bridge *
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi * p2d)260 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
261 {
262 struct device_node *ep, *remote;
263 struct drm_bridge *next_bridge;
264 int ret;
265
266 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
267 if (IS_ERR(ep)) {
268 ret = PTR_ERR(ep);
269 return ERR_PTR(ret);
270 }
271
272 remote = of_graph_get_remote_port_parent(ep);
273 if (!remote || !of_device_is_available(remote)) {
274 DRM_DEV_ERROR(p2d->dev, "no available remote\n");
275 next_bridge = ERR_PTR(-ENODEV);
276 goto out;
277 } else if (!of_device_is_available(remote->parent)) {
278 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
279 next_bridge = ERR_PTR(-ENODEV);
280 goto out;
281 }
282
283 next_bridge = of_drm_find_bridge(remote);
284 if (!next_bridge) {
285 next_bridge = ERR_PTR(-EPROBE_DEFER);
286 goto out;
287 }
288 out:
289 of_node_put(remote);
290 of_node_put(ep);
291
292 return next_bridge;
293 }
294
imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi * p2d)295 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
296 {
297 struct device_node *ep;
298 struct of_endpoint endpoint;
299 int ret;
300
301 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
302 if (IS_ERR(ep))
303 return PTR_ERR(ep);
304
305 ret = of_graph_parse_endpoint(ep, &endpoint);
306 if (ret) {
307 DRM_DEV_ERROR(p2d->dev,
308 "failed to parse endpoint of port@0: %d\n", ret);
309 goto out;
310 }
311
312 p2d->pl_sel = endpoint.id;
313 out:
314 of_node_put(ep);
315
316 return ret;
317 }
318
imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi * p2d)319 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
320 {
321 struct imx8qxp_pxl2dpi *companion_p2d;
322 struct device *dev = p2d->dev;
323 struct device_node *companion;
324 struct device_node *port1, *port2;
325 const struct of_device_id *match;
326 int dual_link;
327 int ret = 0;
328
329 /* Locate the companion PXL2DPI for dual-link operation, if any. */
330 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
331 if (!companion)
332 return 0;
333
334 if (!of_device_is_available(companion)) {
335 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
336 ret = -ENODEV;
337 goto out;
338 }
339
340 /*
341 * Sanity check: the companion bridge must have the same compatible
342 * string.
343 */
344 match = of_match_device(dev->driver->of_match_table, dev);
345 if (!of_device_is_compatible(companion, match->compatible)) {
346 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
347 ret = -ENXIO;
348 goto out;
349 }
350
351 p2d->companion = of_drm_find_bridge(companion);
352 if (!p2d->companion) {
353 ret = -EPROBE_DEFER;
354 DRM_DEV_DEBUG_DRIVER(p2d->dev,
355 "failed to find companion bridge: %d\n",
356 ret);
357 goto out;
358 }
359
360 companion_p2d = bridge_to_p2d(p2d->companion);
361
362 /*
363 * We need to work out if the sink is expecting us to function in
364 * dual-link mode. We do this by looking at the DT port nodes that
365 * the next bridges are connected to. If they are marked as expecting
366 * even pixels and odd pixels than we need to use the companion PXL2DPI.
367 */
368 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
369 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
370 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
371 of_node_put(port1);
372 of_node_put(port2);
373
374 if (dual_link < 0) {
375 ret = dual_link;
376 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
377 ret);
378 goto out;
379 }
380
381 DRM_DEV_DEBUG_DRIVER(dev,
382 "dual-link configuration detected (companion bridge %pOF)\n",
383 companion);
384 out:
385 of_node_put(companion);
386 return ret;
387 }
388
imx8qxp_pxl2dpi_bridge_probe(struct platform_device * pdev)389 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
390 {
391 struct imx8qxp_pxl2dpi *p2d;
392 struct device *dev = &pdev->dev;
393 struct device_node *np = dev->of_node;
394 int ret;
395
396 p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
397 if (!p2d)
398 return -ENOMEM;
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.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
446 p2d->bridge.of_node = np;
447
448 drm_bridge_add(&p2d->bridge);
449
450 return ret;
451 }
452
imx8qxp_pxl2dpi_bridge_remove(struct platform_device * pdev)453 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
454 {
455 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
456
457 drm_bridge_remove(&p2d->bridge);
458
459 pm_runtime_disable(&pdev->dev);
460 }
461
462 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
463 { .compatible = "fsl,imx8qxp-pxl2dpi", },
464 { /* sentinel */ }
465 };
466 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
467
468 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
469 .probe = imx8qxp_pxl2dpi_bridge_probe,
470 .remove_new = imx8qxp_pxl2dpi_bridge_remove,
471 .driver = {
472 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
473 .name = DRIVER_NAME,
474 },
475 };
476 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
477
478 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
479 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
480 MODULE_LICENSE("GPL v2");
481 MODULE_ALIAS("platform:" DRIVER_NAME);
482