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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
35struct 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
50static 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
71static int
72imx8qxp_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
85static void
86imx8qxp_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
130static void
131imx8qxp_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
146static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
147 MEDIA_BUS_FMT_RGB888_1X24,
148 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
149};
150
151static 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
163static u32 *
164imx8qxp_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
198static u32 *
199imx8qxp_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
210static 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
224static struct device_node *
225imx8qxp_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 }
259out:
260 of_node_put(port);
261 return ep;
262}
263
264static struct drm_bridge *
265imx8qxp_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 }
293out:
294 of_node_put(remote);
295 of_node_put(ep);
296
297 return next_bridge;
298}
299
300static 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;
318out:
319 of_node_put(ep);
320
321 return ret;
322}
323
324static 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);
389out:
390 of_node_put(companion);
391 return ret;
392}
393
394static 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
458static int 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 return 0;
467}
468
469static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
470 { .compatible = "fsl,imx8qxp-pxl2dpi", },
471 { /* sentinel */ }
472};
473MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
474
475static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
476 .probe = imx8qxp_pxl2dpi_bridge_probe,
477 .remove = imx8qxp_pxl2dpi_bridge_remove,
478 .driver = {
479 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
480 .name = DRIVER_NAME,
481 },
482};
483module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
484
485MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
486MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
487MODULE_LICENSE("GPL v2");
488MODULE_ALIAS("platform:" DRIVER_NAME);
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
35struct 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
50static 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
66static int
67imx8qxp_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
80static void
81imx8qxp_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
125static void
126imx8qxp_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
141static const u32 imx8qxp_pxl2dpi_bus_output_fmts[] = {
142 MEDIA_BUS_FMT_RGB888_1X24,
143 MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
144};
145
146static 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
158static u32 *
159imx8qxp_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
193static u32 *
194imx8qxp_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
205static 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
219static struct device_node *
220imx8qxp_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 }
254out:
255 of_node_put(port);
256 return ep;
257}
258
259static struct drm_bridge *
260imx8qxp_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 }
288out:
289 of_node_put(remote);
290 of_node_put(ep);
291
292 return next_bridge;
293}
294
295static 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;
313out:
314 of_node_put(ep);
315
316 return ret;
317}
318
319static 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);
384out:
385 of_node_put(companion);
386 return ret;
387}
388
389static 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
453static 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
462static const struct of_device_id imx8qxp_pxl2dpi_dt_ids[] = {
463 { .compatible = "fsl,imx8qxp-pxl2dpi", },
464 { /* sentinel */ }
465};
466MODULE_DEVICE_TABLE(of, imx8qxp_pxl2dpi_dt_ids);
467
468static struct platform_driver imx8qxp_pxl2dpi_bridge_driver = {
469 .probe = imx8qxp_pxl2dpi_bridge_probe,
470 .remove = imx8qxp_pxl2dpi_bridge_remove,
471 .driver = {
472 .of_match_table = imx8qxp_pxl2dpi_dt_ids,
473 .name = DRIVER_NAME,
474 },
475};
476module_platform_driver(imx8qxp_pxl2dpi_bridge_driver);
477
478MODULE_DESCRIPTION("i.MX8QXP pixel link to DPI bridge driver");
479MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
480MODULE_LICENSE("GPL v2");
481MODULE_ALIAS("platform:" DRIVER_NAME);