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
imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_atomic_state * state)125 static void imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
126 struct drm_atomic_state *state)
127 {
128 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
129 int ret;
130
131 ret = pm_runtime_put(p2d->dev);
132 if (ret < 0)
133 DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
134
135 if (p2d->companion)
136 p2d->companion->funcs->atomic_disable(p2d->companion, state);
137 }
138
139 static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
140 MEDIA_BUS_FMT_RGB888_1X24,
141 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
142 };
143
imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)144 static bool imx8qxp_pxl2dpi_bus_output_fmt_supported(u32 fmt)
145 {
146 int i;
147
148 for (i = 0; i < ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts); i++) {
149 if (imx8qxp_pxl2dpi_bus_output_fmts[i] == fmt)
150 return true;
151 }
152
153 return false;
154 }
155
156 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)157 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
158 struct drm_bridge_state *bridge_state,
159 struct drm_crtc_state *crtc_state,
160 struct drm_connector_state *conn_state,
161 u32 output_fmt,
162 unsigned int *num_input_fmts)
163 {
164 u32 *input_fmts;
165
166 if (!imx8qxp_pxl2dpi_bus_output_fmt_supported(output_fmt))
167 return NULL;
168
169 *num_input_fmts = 1;
170
171 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
172 if (!input_fmts)
173 return NULL;
174
175 switch (output_fmt) {
176 case MEDIA_BUS_FMT_RGB888_1X24:
177 input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X36_CPADLO;
178 break;
179 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
180 input_fmts[0] = MEDIA_BUS_FMT_RGB666_1X36_CPADLO;
181 break;
182 default:
183 kfree(input_fmts);
184 input_fmts = NULL;
185 break;
186 }
187
188 return input_fmts;
189 }
190
191 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)192 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts(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 unsigned int *num_output_fmts)
197 {
198 *num_output_fmts = ARRAY_SIZE(imx8qxp_pxl2dpi_bus_output_fmts);
199 return kmemdup(imx8qxp_pxl2dpi_bus_output_fmts,
200 sizeof(imx8qxp_pxl2dpi_bus_output_fmts), GFP_KERNEL);
201 }
202
203 static const struct drm_bridge_funcs imx8qxp_pxl2dpi_bridge_funcs = {
204 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
205 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
206 .atomic_reset = drm_atomic_helper_bridge_reset,
207 .attach = imx8qxp_pxl2dpi_bridge_attach,
208 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
209 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
210 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
211 .atomic_get_input_bus_fmts =
212 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
213 .atomic_get_output_bus_fmts =
214 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
215 };
216
217 static struct device_node *
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi * p2d,u32 port_id)218 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
219 u32 port_id)
220 {
221 struct device_node *port, *ep;
222 int ep_cnt;
223
224 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
225 if (!port) {
226 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
227 return ERR_PTR(-ENODEV);
228 }
229
230 ep_cnt = of_get_available_child_count(port);
231 if (ep_cnt == 0) {
232 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
233 port_id);
234 ep = ERR_PTR(-ENODEV);
235 goto out;
236 } else if (ep_cnt > 1) {
237 DRM_DEV_ERROR(p2d->dev,
238 "invalid available endpoints of port@%u\n",
239 port_id);
240 ep = ERR_PTR(-EINVAL);
241 goto out;
242 }
243
244 ep = of_get_next_available_child(port, NULL);
245 if (!ep) {
246 DRM_DEV_ERROR(p2d->dev,
247 "failed to get available endpoint of port@%u\n",
248 port_id);
249 ep = ERR_PTR(-ENODEV);
250 goto out;
251 }
252 out:
253 of_node_put(port);
254 return ep;
255 }
256
257 static struct drm_bridge *
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi * p2d)258 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
259 {
260 struct device_node *ep, *remote;
261 struct drm_bridge *next_bridge;
262 int ret;
263
264 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
265 if (IS_ERR(ep)) {
266 ret = PTR_ERR(ep);
267 return ERR_PTR(ret);
268 }
269
270 remote = of_graph_get_remote_port_parent(ep);
271 if (!remote || !of_device_is_available(remote)) {
272 DRM_DEV_ERROR(p2d->dev, "no available remote\n");
273 next_bridge = ERR_PTR(-ENODEV);
274 goto out;
275 } else if (!of_device_is_available(remote->parent)) {
276 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
277 next_bridge = ERR_PTR(-ENODEV);
278 goto out;
279 }
280
281 next_bridge = of_drm_find_bridge(remote);
282 if (!next_bridge) {
283 next_bridge = ERR_PTR(-EPROBE_DEFER);
284 goto out;
285 }
286 out:
287 of_node_put(remote);
288 of_node_put(ep);
289
290 return next_bridge;
291 }
292
imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi * p2d)293 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
294 {
295 struct device_node *ep;
296 struct of_endpoint endpoint;
297 int ret;
298
299 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
300 if (IS_ERR(ep))
301 return PTR_ERR(ep);
302
303 ret = of_graph_parse_endpoint(ep, &endpoint);
304 if (ret) {
305 DRM_DEV_ERROR(p2d->dev,
306 "failed to parse endpoint of port@0: %d\n", ret);
307 goto out;
308 }
309
310 p2d->pl_sel = endpoint.id;
311 out:
312 of_node_put(ep);
313
314 return ret;
315 }
316
imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi * p2d)317 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
318 {
319 struct imx8qxp_pxl2dpi *companion_p2d;
320 struct device *dev = p2d->dev;
321 struct device_node *companion;
322 struct device_node *port1, *port2;
323 const struct of_device_id *match;
324 int dual_link;
325 int ret = 0;
326
327 /* Locate the companion PXL2DPI for dual-link operation, if any. */
328 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
329 if (!companion)
330 return 0;
331
332 if (!of_device_is_available(companion)) {
333 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
334 ret = -ENODEV;
335 goto out;
336 }
337
338 /*
339 * Sanity check: the companion bridge must have the same compatible
340 * string.
341 */
342 match = of_match_device(dev->driver->of_match_table, dev);
343 if (!of_device_is_compatible(companion, match->compatible)) {
344 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
345 ret = -ENXIO;
346 goto out;
347 }
348
349 p2d->companion = of_drm_find_bridge(companion);
350 if (!p2d->companion) {
351 ret = -EPROBE_DEFER;
352 DRM_DEV_DEBUG_DRIVER(p2d->dev,
353 "failed to find companion bridge: %d\n",
354 ret);
355 goto out;
356 }
357
358 companion_p2d = bridge_to_p2d(p2d->companion);
359
360 /*
361 * We need to work out if the sink is expecting us to function in
362 * dual-link mode. We do this by looking at the DT port nodes that
363 * the next bridges are connected to. If they are marked as expecting
364 * even pixels and odd pixels than we need to use the companion PXL2DPI.
365 */
366 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
367 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
368 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
369 of_node_put(port1);
370 of_node_put(port2);
371
372 if (dual_link < 0) {
373 ret = dual_link;
374 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
375 ret);
376 goto out;
377 }
378
379 DRM_DEV_DEBUG_DRIVER(dev,
380 "dual-link configuration detected (companion bridge %pOF)\n",
381 companion);
382 out:
383 of_node_put(companion);
384 return ret;
385 }
386
imx8qxp_pxl2dpi_bridge_probe(struct platform_device * pdev)387 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
388 {
389 struct imx8qxp_pxl2dpi *p2d;
390 struct device *dev = &pdev->dev;
391 struct device_node *np = dev->of_node;
392 int ret;
393
394 p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
395 if (!p2d)
396 return -ENOMEM;
397
398 p2d->regmap = syscon_node_to_regmap(np->parent);
399 if (IS_ERR(p2d->regmap)) {
400 ret = PTR_ERR(p2d->regmap);
401 if (ret != -EPROBE_DEFER)
402 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
403 return ret;
404 }
405
406 ret = imx_scu_get_handle(&p2d->ipc_handle);
407 if (ret) {
408 if (ret != -EPROBE_DEFER)
409 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
410 ret);
411 return ret;
412 }
413
414 p2d->dev = dev;
415
416 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
417 if (ret) {
418 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
419 return ret;
420 }
421
422 p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
423 if (IS_ERR(p2d->next_bridge)) {
424 ret = PTR_ERR(p2d->next_bridge);
425 if (ret != -EPROBE_DEFER)
426 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
427 ret);
428 return ret;
429 }
430
431 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
432 if (ret)
433 return ret;
434
435 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
436 if (ret)
437 return ret;
438
439 platform_set_drvdata(pdev, p2d);
440 pm_runtime_enable(dev);
441
442 p2d->bridge.driver_private = p2d;
443 p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
444 p2d->bridge.of_node = np;
445
446 drm_bridge_add(&p2d->bridge);
447
448 return ret;
449 }
450
imx8qxp_pxl2dpi_bridge_remove(struct platform_device * pdev)451 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
452 {
453 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
454
455 drm_bridge_remove(&p2d->bridge);
456
457 pm_runtime_disable(&pdev->dev);
458 }
459
460 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
461 { .compatible = "fsl,imx8qxp-pxl2dpi", },
462 { /* sentinel */ }
463 };
464 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
465
466 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
467 .probe = imx8qxp_pxl2dpi_bridge_probe,
468 .remove = imx8qxp_pxl2dpi_bridge_remove,
469 .driver = {
470 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
471 .name = DRIVER_NAME,
472 },
473 };
474 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
475
476 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
477 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
478 MODULE_LICENSE("GPL v2");
479 MODULE_ALIAS("platform:" DRIVER_NAME);
480