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 if (!bridge->encoder) {
62 DRM_DEV_ERROR(p2d->dev, "missing encoder\n");
63 return -ENODEV;
64 }
65
66 return drm_bridge_attach(bridge->encoder,
67 p2d->next_bridge, bridge,
68 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
69 }
70
71 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)72 imx8qxp_pxl2dpi_bridge_atomic_check(struct drm_bridge *bridge,
73 struct drm_bridge_state *bridge_state,
74 struct drm_crtc_state *crtc_state,
75 struct drm_connector_state *conn_state)
76 {
77 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
78
79 p2d->in_bus_format = bridge_state->input_bus_cfg.format;
80 p2d->out_bus_format = bridge_state->output_bus_cfg.format;
81
82 return 0;
83 }
84
85 static void
imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)86 imx8qxp_pxl2dpi_bridge_mode_set(struct drm_bridge *bridge,
87 const struct drm_display_mode *mode,
88 const struct drm_display_mode *adjusted_mode)
89 {
90 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
91 struct imx8qxp_pxl2dpi *companion_p2d;
92 int ret;
93
94 ret = pm_runtime_get_sync(p2d->dev);
95 if (ret < 0)
96 DRM_DEV_ERROR(p2d->dev,
97 "failed to get runtime PM sync: %d\n", ret);
98
99 ret = imx_sc_misc_set_control(p2d->ipc_handle, p2d->sc_resource,
100 IMX_SC_C_PXL_LINK_SEL, p2d->pl_sel);
101 if (ret)
102 DRM_DEV_ERROR(p2d->dev,
103 "failed to set pixel link selection(%u): %d\n",
104 p2d->pl_sel, ret);
105
106 switch (p2d->out_bus_format) {
107 case MEDIA_BUS_FMT_RGB888_1X24:
108 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG_24BIT);
109 break;
110 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
111 regmap_write(p2d->regmap, PXL2DPI_CTRL, CFG2_18BIT);
112 break;
113 default:
114 DRM_DEV_ERROR(p2d->dev,
115 "unsupported output bus format 0x%08x\n",
116 p2d->out_bus_format);
117 }
118
119 if (p2d->companion) {
120 companion_p2d = bridge_to_p2d(p2d->companion);
121
122 companion_p2d->in_bus_format = p2d->in_bus_format;
123 companion_p2d->out_bus_format = p2d->out_bus_format;
124
125 p2d->companion->funcs->mode_set(p2d->companion, mode,
126 adjusted_mode);
127 }
128 }
129
130 static void
imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)131 imx8qxp_pxl2dpi_bridge_atomic_disable(struct drm_bridge *bridge,
132 struct drm_bridge_state *old_bridge_state)
133 {
134 struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
135 int ret;
136
137 ret = pm_runtime_put(p2d->dev);
138 if (ret < 0)
139 DRM_DEV_ERROR(p2d->dev, "failed to put runtime PM: %d\n", ret);
140
141 if (p2d->companion)
142 p2d->companion->funcs->atomic_disable(p2d->companion,
143 old_bridge_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(sizeof(*input_fmts), GFP_KERNEL);
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 .atomic_check = imx8qxp_pxl2dpi_bridge_atomic_check,
216 .mode_set = imx8qxp_pxl2dpi_bridge_mode_set,
217 .atomic_disable = imx8qxp_pxl2dpi_bridge_atomic_disable,
218 .atomic_get_input_bus_fmts =
219 imx8qxp_pxl2dpi_bridge_atomic_get_input_bus_fmts,
220 .atomic_get_output_bus_fmts =
221 imx8qxp_pxl2dpi_bridge_atomic_get_output_bus_fmts,
222 };
223
224 static struct device_node *
imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi * p2d,u32 port_id)225 imx8qxp_pxl2dpi_get_available_ep_from_port(struct imx8qxp_pxl2dpi *p2d,
226 u32 port_id)
227 {
228 struct device_node *port, *ep;
229 int ep_cnt;
230
231 port = of_graph_get_port_by_id(p2d->dev->of_node, port_id);
232 if (!port) {
233 DRM_DEV_ERROR(p2d->dev, "failed to get port@%u\n", port_id);
234 return ERR_PTR(-ENODEV);
235 }
236
237 ep_cnt = of_get_available_child_count(port);
238 if (ep_cnt == 0) {
239 DRM_DEV_ERROR(p2d->dev, "no available endpoints of port@%u\n",
240 port_id);
241 ep = ERR_PTR(-ENODEV);
242 goto out;
243 } else if (ep_cnt > 1) {
244 DRM_DEV_ERROR(p2d->dev,
245 "invalid available endpoints of port@%u\n",
246 port_id);
247 ep = ERR_PTR(-EINVAL);
248 goto out;
249 }
250
251 ep = of_get_next_available_child(port, NULL);
252 if (!ep) {
253 DRM_DEV_ERROR(p2d->dev,
254 "failed to get available endpoint of port@%u\n",
255 port_id);
256 ep = ERR_PTR(-ENODEV);
257 goto out;
258 }
259 out:
260 of_node_put(port);
261 return ep;
262 }
263
264 static struct drm_bridge *
imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi * p2d)265 imx8qxp_pxl2dpi_find_next_bridge(struct imx8qxp_pxl2dpi *p2d)
266 {
267 struct device_node *ep, *remote;
268 struct drm_bridge *next_bridge;
269 int ret;
270
271 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 1);
272 if (IS_ERR(ep)) {
273 ret = PTR_ERR(ep);
274 return ERR_PTR(ret);
275 }
276
277 remote = of_graph_get_remote_port_parent(ep);
278 if (!remote || !of_device_is_available(remote)) {
279 DRM_DEV_ERROR(p2d->dev, "no available remote\n");
280 next_bridge = ERR_PTR(-ENODEV);
281 goto out;
282 } else if (!of_device_is_available(remote->parent)) {
283 DRM_DEV_ERROR(p2d->dev, "remote parent is not available\n");
284 next_bridge = ERR_PTR(-ENODEV);
285 goto out;
286 }
287
288 next_bridge = of_drm_find_bridge(remote);
289 if (!next_bridge) {
290 next_bridge = ERR_PTR(-EPROBE_DEFER);
291 goto out;
292 }
293 out:
294 of_node_put(remote);
295 of_node_put(ep);
296
297 return next_bridge;
298 }
299
imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi * p2d)300 static int imx8qxp_pxl2dpi_set_pixel_link_sel(struct imx8qxp_pxl2dpi *p2d)
301 {
302 struct device_node *ep;
303 struct of_endpoint endpoint;
304 int ret;
305
306 ep = imx8qxp_pxl2dpi_get_available_ep_from_port(p2d, 0);
307 if (IS_ERR(ep))
308 return PTR_ERR(ep);
309
310 ret = of_graph_parse_endpoint(ep, &endpoint);
311 if (ret) {
312 DRM_DEV_ERROR(p2d->dev,
313 "failed to parse endpoint of port@0: %d\n", ret);
314 goto out;
315 }
316
317 p2d->pl_sel = endpoint.id;
318 out:
319 of_node_put(ep);
320
321 return ret;
322 }
323
imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi * p2d)324 static int imx8qxp_pxl2dpi_parse_dt_companion(struct imx8qxp_pxl2dpi *p2d)
325 {
326 struct imx8qxp_pxl2dpi *companion_p2d;
327 struct device *dev = p2d->dev;
328 struct device_node *companion;
329 struct device_node *port1, *port2;
330 const struct of_device_id *match;
331 int dual_link;
332 int ret = 0;
333
334 /* Locate the companion PXL2DPI for dual-link operation, if any. */
335 companion = of_parse_phandle(dev->of_node, "fsl,companion-pxl2dpi", 0);
336 if (!companion)
337 return 0;
338
339 if (!of_device_is_available(companion)) {
340 DRM_DEV_ERROR(dev, "companion PXL2DPI is not available\n");
341 ret = -ENODEV;
342 goto out;
343 }
344
345 /*
346 * Sanity check: the companion bridge must have the same compatible
347 * string.
348 */
349 match = of_match_device(dev->driver->of_match_table, dev);
350 if (!of_device_is_compatible(companion, match->compatible)) {
351 DRM_DEV_ERROR(dev, "companion PXL2DPI is incompatible\n");
352 ret = -ENXIO;
353 goto out;
354 }
355
356 p2d->companion = of_drm_find_bridge(companion);
357 if (!p2d->companion) {
358 ret = -EPROBE_DEFER;
359 DRM_DEV_DEBUG_DRIVER(p2d->dev,
360 "failed to find companion bridge: %d\n",
361 ret);
362 goto out;
363 }
364
365 companion_p2d = bridge_to_p2d(p2d->companion);
366
367 /*
368 * We need to work out if the sink is expecting us to function in
369 * dual-link mode. We do this by looking at the DT port nodes that
370 * the next bridges are connected to. If they are marked as expecting
371 * even pixels and odd pixels than we need to use the companion PXL2DPI.
372 */
373 port1 = of_graph_get_port_by_id(p2d->next_bridge->of_node, 1);
374 port2 = of_graph_get_port_by_id(companion_p2d->next_bridge->of_node, 1);
375 dual_link = drm_of_lvds_get_dual_link_pixel_order(port1, port2);
376 of_node_put(port1);
377 of_node_put(port2);
378
379 if (dual_link < 0) {
380 ret = dual_link;
381 DRM_DEV_ERROR(dev, "failed to get dual link pixel order: %d\n",
382 ret);
383 goto out;
384 }
385
386 DRM_DEV_DEBUG_DRIVER(dev,
387 "dual-link configuration detected (companion bridge %pOF)\n",
388 companion);
389 out:
390 of_node_put(companion);
391 return ret;
392 }
393
imx8qxp_pxl2dpi_bridge_probe(struct platform_device * pdev)394 static int imx8qxp_pxl2dpi_bridge_probe(struct platform_device *pdev)
395 {
396 struct imx8qxp_pxl2dpi *p2d;
397 struct device *dev = &pdev->dev;
398 struct device_node *np = dev->of_node;
399 int ret;
400
401 p2d = devm_kzalloc(dev, sizeof(*p2d), GFP_KERNEL);
402 if (!p2d)
403 return -ENOMEM;
404
405 p2d->regmap = syscon_node_to_regmap(np->parent);
406 if (IS_ERR(p2d->regmap)) {
407 ret = PTR_ERR(p2d->regmap);
408 if (ret != -EPROBE_DEFER)
409 DRM_DEV_ERROR(dev, "failed to get regmap: %d\n", ret);
410 return ret;
411 }
412
413 ret = imx_scu_get_handle(&p2d->ipc_handle);
414 if (ret) {
415 if (ret != -EPROBE_DEFER)
416 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
417 ret);
418 return ret;
419 }
420
421 p2d->dev = dev;
422
423 ret = of_property_read_u32(np, "fsl,sc-resource", &p2d->sc_resource);
424 if (ret) {
425 DRM_DEV_ERROR(dev, "failed to get SC resource %d\n", ret);
426 return ret;
427 }
428
429 p2d->next_bridge = imx8qxp_pxl2dpi_find_next_bridge(p2d);
430 if (IS_ERR(p2d->next_bridge)) {
431 ret = PTR_ERR(p2d->next_bridge);
432 if (ret != -EPROBE_DEFER)
433 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
434 ret);
435 return ret;
436 }
437
438 ret = imx8qxp_pxl2dpi_set_pixel_link_sel(p2d);
439 if (ret)
440 return ret;
441
442 ret = imx8qxp_pxl2dpi_parse_dt_companion(p2d);
443 if (ret)
444 return ret;
445
446 platform_set_drvdata(pdev, p2d);
447 pm_runtime_enable(dev);
448
449 p2d->bridge.driver_private = p2d;
450 p2d->bridge.funcs = &imx8qxp_pxl2dpi_bridge_funcs;
451 p2d->bridge.of_node = np;
452
453 drm_bridge_add(&p2d->bridge);
454
455 return ret;
456 }
457
imx8qxp_pxl2dpi_bridge_remove(struct platform_device * pdev)458 static void imx8qxp_pxl2dpi_bridge_remove(struct platform_device *pdev)
459 {
460 struct imx8qxp_pxl2dpi *p2d = platform_get_drvdata(pdev);
461
462 drm_bridge_remove(&p2d->bridge);
463
464 pm_runtime_disable(&pdev->dev);
465 }
466
467 static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
468 { .compatible = "fsl,imx8qxp-pxl2dpi", },
469 { /* sentinel */ }
470 };
471 MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
472
473 static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
474 .probe = imx8qxp_pxl2dpi_bridge_probe,
475 .remove_new = imx8qxp_pxl2dpi_bridge_remove,
476 .driver = {
477 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
478 .name = DRIVER_NAME,
479 },
480 };
481 module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
482
483 MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
484 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
485 MODULE_LICENSE("GPL v2");
486 MODULE_ALIAS("platform:" DRIVER_NAME);
487