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 struct device_node *
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi * p2d,u32 port_id)226 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
227 u32 port_id)
228 {
229 struct device_node *port, *ep;
230 int ep_cnt;
231
232 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
233 if (!port) {
234 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
235 return ERR_PTR(-ENODEV);
236 }
237
238 ep_cnt = of_get_available_child_count(port);
239 if (ep_cnt == 0) {
240 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
241 port_id);
242 ep = ERR_PTR(-ENODEV);
243 goto out;
244 } else if (ep_cnt > 1) {
245 DRM_DEV_ERROR(p2d->dev,
246 "invalid available endpoints of port@%u\n",
247 port_id);
248 ep = ERR_PTR(-EINVAL);
249 goto out;
250 }
251
252 ep = of_get_next_available_child(port, NULL);
253 if (!ep) {
254 DRM_DEV_ERROR(p2d->dev,
255 "failed to get available endpoint of port@%u\n",
256 port_id);
257 ep = ERR_PTR(-ENODEV);
258 goto out;
259 }
260 out:
261 of_node_put(port);
262 return ep;
263 }
264
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi * p2d)265 static int imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
266 {
267 struct device_node *ep __free(device_node) =
268 imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
269 if (IS_ERR(ep))
270 return PTR_ERR(ep);
271
272 struct device_node *remote __free(device_node) = 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 return -ENODEV;
276 } else if (!of_device_is_available(remote->parent)) {
277 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
278 return -ENODEV;
279 }
280
281 p2d->bridge.next_bridge = of_drm_find_and_get_bridge(remote);
282 if (!p2d->bridge.next_bridge)
283 return -EPROBE_DEFER;
284
285 return 0;
286 }
287
imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi * p2d)288 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
289 {
290 struct device_node *ep;
291 struct of_endpoint endpoint;
292 int ret;
293
294 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
295 if (IS_ERR(ep))
296 return PTR_ERR(ep);
297
298 ret = of_graph_parse_endpoint(ep, &endpoint);
299 if (ret) {
300 DRM_DEV_ERROR(p2d->dev,
301 "failed to parse endpoint of port@0: %d\n", ret);
302 goto out;
303 }
304
305 p2d->pl_sel = endpoint.id;
306 out:
307 of_node_put(ep);
308
309 return ret;
310 }
311
imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi * p2d)312 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
313 {
314 struct imx8qxp_pxl2dpi *companion_p2d;
315 struct device *dev = p2d->dev;
316 struct device_node *companion;
317 struct device_node *port1, *port2;
318 const struct of_device_id *match;
319 int dual_link;
320 int ret = 0;
321
322 /* Locate the companion PXL2DPI for dual-link operation, if any. */
323 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
324 if (!companion)
325 return 0;
326
327 if (!of_device_is_available(companion)) {
328 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
329 ret = -ENODEV;
330 goto out;
331 }
332
333 /*
334 * Sanity check: the companion bridge must have the same compatible
335 * string.
336 */
337 match = of_match_device(dev->driver->of_match_table, dev);
338 if (!of_device_is_compatible(companion, match->compatible)) {
339 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
340 ret = -ENXIO;
341 goto out;
342 }
343
344 p2d->companion = of_drm_find_and_get_bridge(companion);
345 if (!p2d->companion) {
346 ret = -EPROBE_DEFER;
347 DRM_DEV_DEBUG_DRIVER(p2d->dev,
348 "failed to find companion bridge: %d\n",
349 ret);
350 goto out;
351 }
352
353 companion_p2d = bridge_to_p2d(p2d->companion);
354
355 /*
356 * We need to work out if the sink is expecting us to function in
357 * dual-link mode. We do this by looking at the DT port nodes that
358 * the next bridges are connected to. If they are marked as expecting
359 * even pixels and odd pixels than we need to use the companion PXL2DPI.
360 */
361 port1 = of_graph_get_port_by_id(p2d->bridge.next_bridge->of_node, 1);
362 port2 = of_graph_get_port_by_id(companion_p2d->bridge.next_bridge->of_node, 1);
363 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
364 of_node_put(port1);
365 of_node_put(port2);
366
367 if (dual_link < 0) {
368 ret = dual_link;
369 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
370 ret);
371 goto out;
372 }
373
374 DRM_DEV_DEBUG_DRIVER(dev,
375 "dual-link configuration detected (companion bridge %pOF)\n",
376 companion);
377 out:
378 of_node_put(companion);
379 return ret;
380 }
381
imx8qxp_pxl2dpi_bridge_probe(struct platform_device * pdev)382 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
383 {
384 struct imx8qxp_pxl2dpi *p2d;
385 struct device *dev = &pdev->dev;
386 struct device_node *np = dev->of_node;
387 int ret;
388
389 p2d = devm_drm_bridge_alloc(dev, struct imx8qxp_pxl2dpi, bridge,
390 &imx8qxp_pxl2dpi_bridge_funcs);
391 if (IS_ERR(p2d))
392 return PTR_ERR(p2d);
393
394 p2d->regmap = syscon_node_to_regmap(np->parent);
395 if (IS_ERR(p2d->regmap)) {
396 ret = PTR_ERR(p2d->regmap);
397 if (ret != -EPROBE_DEFER)
398 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
399 return ret;
400 }
401
402 ret = imx_scu_get_handle(&p2d->ipc_handle);
403 if (ret) {
404 if (ret != -EPROBE_DEFER)
405 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
406 ret);
407 return ret;
408 }
409
410 p2d->dev = dev;
411
412 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
413 if (ret) {
414 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
415 return ret;
416 }
417
418 ret = imx8qxp_pxl2dpi_find_next_bridge(p2d);
419 if (ret)
420 return ret;
421
422 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
423 if (ret)
424 return ret;
425
426 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
427 if (ret)
428 return ret;
429
430 platform_set_drvdata(pdev, p2d);
431 pm_runtime_enable(dev);
432
433 p2d->bridge.driver_private = p2d;
434 p2d->bridge.of_node = np;
435
436 drm_bridge_add(&p2d->bridge);
437
438 return ret;
439 }
440
imx8qxp_pxl2dpi_bridge_remove(struct platform_device * pdev)441 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
442 {
443 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
444
445 drm_bridge_remove(&p2d->bridge);
446
447 pm_runtime_disable(&pdev->dev);
448 }
449
450 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
451 { .compatible = "fsl,imx8qxp-pxl2dpi", },
452 { /* sentinel */ }
453 };
454 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
455
456 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
457 .probe = imx8qxp_pxl2dpi_bridge_probe,
458 .remove = imx8qxp_pxl2dpi_bridge_remove,
459 .driver = {
460 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
461 .name = DRIVER_NAME,
462 },
463 };
464 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
465
466 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
467 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
468 MODULE_LICENSE("GPL v2");
469 MODULE_ALIAS("platform:" DRIVER_NAME);
470