1 // SPDX-License-Identifier: GPL-2.0+
2
3 /*
4 * Copyright 2020,2022 NXP
5 */
6
7 #include <linux/firmware/imx/svc/misc.h>
8 #include <linux/media-bus-format.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/of_graph.h>
12 #include <linux/platform_device.h>
13
14 #include <drm/drm_atomic_state_helper.h>
15 #include <drm/drm_bridge.h>
16 #include <drm/drm_print.h>
17
18 #include <dt-bindings/firmware/imx/rsrc.h>
19
20 #define DRIVER_NAME "imx8qxp-display-pixel-link"
21 #define PL_MAX_MST_ADDR 3
22 #define PL_MAX_NEXT_BRIDGES 2
23
24 struct imx8qxp_pixel_link {
25 struct drm_bridge bridge;
26 struct drm_bridge *next_bridge;
27 struct device *dev;
28 struct imx_sc_ipc *ipc_handle;
29 u8 stream_id;
30 u8 dc_id;
31 u32 sink_rsc;
32 u32 mst_addr;
33 u8 mst_addr_ctrl;
34 u8 mst_en_ctrl;
35 u8 mst_vld_ctrl;
36 u8 sync_ctrl;
37 };
38
imx8qxp_pixel_link_enable_mst_en(struct imx8qxp_pixel_link * pl)39 static void imx8qxp_pixel_link_enable_mst_en(struct imx8qxp_pixel_link *pl)
40 {
41 int ret;
42
43 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc,
44 pl->mst_en_ctrl, true);
45 if (ret)
46 DRM_DEV_ERROR(pl->dev,
47 "failed to enable DC%u stream%u pixel link mst_en: %d\n",
48 pl->dc_id, pl->stream_id, ret);
49 }
50
imx8qxp_pixel_link_enable_mst_vld(struct imx8qxp_pixel_link * pl)51 static void imx8qxp_pixel_link_enable_mst_vld(struct imx8qxp_pixel_link *pl)
52 {
53 int ret;
54
55 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc,
56 pl->mst_vld_ctrl, true);
57 if (ret)
58 DRM_DEV_ERROR(pl->dev,
59 "failed to enable DC%u stream%u pixel link mst_vld: %d\n",
60 pl->dc_id, pl->stream_id, ret);
61 }
62
imx8qxp_pixel_link_enable_sync(struct imx8qxp_pixel_link * pl)63 static void imx8qxp_pixel_link_enable_sync(struct imx8qxp_pixel_link *pl)
64 {
65 int ret;
66
67 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc,
68 pl->sync_ctrl, true);
69 if (ret)
70 DRM_DEV_ERROR(pl->dev,
71 "failed to enable DC%u stream%u pixel link sync: %d\n",
72 pl->dc_id, pl->stream_id, ret);
73 }
74
imx8qxp_pixel_link_disable_mst_en(struct imx8qxp_pixel_link * pl)75 static int imx8qxp_pixel_link_disable_mst_en(struct imx8qxp_pixel_link *pl)
76 {
77 int ret;
78
79 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc,
80 pl->mst_en_ctrl, false);
81 if (ret)
82 DRM_DEV_ERROR(pl->dev,
83 "failed to disable DC%u stream%u pixel link mst_en: %d\n",
84 pl->dc_id, pl->stream_id, ret);
85
86 return ret;
87 }
88
imx8qxp_pixel_link_disable_mst_vld(struct imx8qxp_pixel_link * pl)89 static int imx8qxp_pixel_link_disable_mst_vld(struct imx8qxp_pixel_link *pl)
90 {
91 int ret;
92
93 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc,
94 pl->mst_vld_ctrl, false);
95 if (ret)
96 DRM_DEV_ERROR(pl->dev,
97 "failed to disable DC%u stream%u pixel link mst_vld: %d\n",
98 pl->dc_id, pl->stream_id, ret);
99
100 return ret;
101 }
102
imx8qxp_pixel_link_disable_sync(struct imx8qxp_pixel_link * pl)103 static int imx8qxp_pixel_link_disable_sync(struct imx8qxp_pixel_link *pl)
104 {
105 int ret;
106
107 ret = imx_sc_misc_set_control(pl->ipc_handle, pl->sink_rsc,
108 pl->sync_ctrl, false);
109 if (ret)
110 DRM_DEV_ERROR(pl->dev,
111 "failed to disable DC%u stream%u pixel link sync: %d\n",
112 pl->dc_id, pl->stream_id, ret);
113
114 return ret;
115 }
116
imx8qxp_pixel_link_set_mst_addr(struct imx8qxp_pixel_link * pl)117 static void imx8qxp_pixel_link_set_mst_addr(struct imx8qxp_pixel_link *pl)
118 {
119 int ret;
120
121 ret = imx_sc_misc_set_control(pl->ipc_handle,
122 pl->sink_rsc, pl->mst_addr_ctrl,
123 pl->mst_addr);
124 if (ret)
125 DRM_DEV_ERROR(pl->dev,
126 "failed to set DC%u stream%u pixel link mst addr(%u): %d\n",
127 pl->dc_id, pl->stream_id, pl->mst_addr, ret);
128 }
129
imx8qxp_pixel_link_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)130 static int imx8qxp_pixel_link_bridge_attach(struct drm_bridge *bridge,
131 enum drm_bridge_attach_flags flags)
132 {
133 struct imx8qxp_pixel_link *pl = bridge->driver_private;
134
135 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
136 DRM_DEV_ERROR(pl->dev,
137 "do not support creating a drm_connector\n");
138 return -EINVAL;
139 }
140
141 if (!bridge->encoder) {
142 DRM_DEV_ERROR(pl->dev, "missing encoder\n");
143 return -ENODEV;
144 }
145
146 return drm_bridge_attach(bridge->encoder,
147 pl->next_bridge, bridge,
148 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
149 }
150
151 static void
imx8qxp_pixel_link_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adjusted_mode)152 imx8qxp_pixel_link_bridge_mode_set(struct drm_bridge *bridge,
153 const struct drm_display_mode *mode,
154 const struct drm_display_mode *adjusted_mode)
155 {
156 struct imx8qxp_pixel_link *pl = bridge->driver_private;
157
158 imx8qxp_pixel_link_set_mst_addr(pl);
159 }
160
161 static void
imx8qxp_pixel_link_bridge_atomic_enable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)162 imx8qxp_pixel_link_bridge_atomic_enable(struct drm_bridge *bridge,
163 struct drm_bridge_state *old_bridge_state)
164 {
165 struct imx8qxp_pixel_link *pl = bridge->driver_private;
166
167 imx8qxp_pixel_link_enable_mst_en(pl);
168 imx8qxp_pixel_link_enable_mst_vld(pl);
169 imx8qxp_pixel_link_enable_sync(pl);
170 }
171
172 static void
imx8qxp_pixel_link_bridge_atomic_disable(struct drm_bridge * bridge,struct drm_bridge_state * old_bridge_state)173 imx8qxp_pixel_link_bridge_atomic_disable(struct drm_bridge *bridge,
174 struct drm_bridge_state *old_bridge_state)
175 {
176 struct imx8qxp_pixel_link *pl = bridge->driver_private;
177
178 imx8qxp_pixel_link_disable_mst_en(pl);
179 imx8qxp_pixel_link_disable_mst_vld(pl);
180 imx8qxp_pixel_link_disable_sync(pl);
181 }
182
183 static const u32 imx8qxp_pixel_link_bus_output_fmts[] = {
184 MEDIA_BUS_FMT_RGB888_1X36_CPADLO,
185 MEDIA_BUS_FMT_RGB666_1X36_CPADLO,
186 };
187
imx8qxp_pixel_link_bus_output_fmt_supported(u32 fmt)188 static bool imx8qxp_pixel_link_bus_output_fmt_supported(u32 fmt)
189 {
190 int i;
191
192 for (i = 0; i < ARRAY_SIZE(imx8qxp_pixel_link_bus_output_fmts); i++) {
193 if (imx8qxp_pixel_link_bus_output_fmts[i] == fmt)
194 return true;
195 }
196
197 return false;
198 }
199
200 static u32 *
imx8qxp_pixel_link_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)201 imx8qxp_pixel_link_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
202 struct drm_bridge_state *bridge_state,
203 struct drm_crtc_state *crtc_state,
204 struct drm_connector_state *conn_state,
205 u32 output_fmt,
206 unsigned int *num_input_fmts)
207 {
208 u32 *input_fmts;
209
210 if (!imx8qxp_pixel_link_bus_output_fmt_supported(output_fmt))
211 return NULL;
212
213 *num_input_fmts = 1;
214
215 input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
216 if (!input_fmts)
217 return NULL;
218
219 input_fmts[0] = output_fmt;
220
221 return input_fmts;
222 }
223
224 static u32 *
imx8qxp_pixel_link_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)225 imx8qxp_pixel_link_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
226 struct drm_bridge_state *bridge_state,
227 struct drm_crtc_state *crtc_state,
228 struct drm_connector_state *conn_state,
229 unsigned int *num_output_fmts)
230 {
231 *num_output_fmts = ARRAY_SIZE(imx8qxp_pixel_link_bus_output_fmts);
232 return kmemdup(imx8qxp_pixel_link_bus_output_fmts,
233 sizeof(imx8qxp_pixel_link_bus_output_fmts), GFP_KERNEL);
234 }
235
236 static const struct drm_bridge_funcs imx8qxp_pixel_link_bridge_funcs = {
237 .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
238 .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
239 .atomic_reset = drm_atomic_helper_bridge_reset,
240 .attach = imx8qxp_pixel_link_bridge_attach,
241 .mode_set = imx8qxp_pixel_link_bridge_mode_set,
242 .atomic_enable = imx8qxp_pixel_link_bridge_atomic_enable,
243 .atomic_disable = imx8qxp_pixel_link_bridge_atomic_disable,
244 .atomic_get_input_bus_fmts =
245 imx8qxp_pixel_link_bridge_atomic_get_input_bus_fmts,
246 .atomic_get_output_bus_fmts =
247 imx8qxp_pixel_link_bridge_atomic_get_output_bus_fmts,
248 };
249
imx8qxp_pixel_link_disable_all_controls(struct imx8qxp_pixel_link * pl)250 static int imx8qxp_pixel_link_disable_all_controls(struct imx8qxp_pixel_link *pl)
251 {
252 int ret;
253
254 ret = imx8qxp_pixel_link_disable_mst_en(pl);
255 if (ret)
256 return ret;
257
258 ret = imx8qxp_pixel_link_disable_mst_vld(pl);
259 if (ret)
260 return ret;
261
262 return imx8qxp_pixel_link_disable_sync(pl);
263 }
264
265 static struct drm_bridge *
imx8qxp_pixel_link_find_next_bridge(struct imx8qxp_pixel_link * pl)266 imx8qxp_pixel_link_find_next_bridge(struct imx8qxp_pixel_link *pl)
267 {
268 struct device_node *np = pl->dev->of_node;
269 struct device_node *port, *remote;
270 struct drm_bridge *next_bridge[PL_MAX_NEXT_BRIDGES];
271 u32 port_id;
272 bool found_port = false;
273 int reg, ep_cnt = 0;
274 /* select the first next bridge by default */
275 int bridge_sel = 0;
276
277 for (port_id = 1; port_id <= PL_MAX_MST_ADDR + 1; port_id++) {
278 port = of_graph_get_port_by_id(np, port_id);
279 if (!port)
280 continue;
281
282 if (of_device_is_available(port)) {
283 found_port = true;
284 of_node_put(port);
285 break;
286 }
287
288 of_node_put(port);
289 }
290
291 if (!found_port) {
292 DRM_DEV_ERROR(pl->dev, "no available output port\n");
293 return ERR_PTR(-ENODEV);
294 }
295
296 for (reg = 0; reg < PL_MAX_NEXT_BRIDGES; reg++) {
297 remote = of_graph_get_remote_node(np, port_id, reg);
298 if (!remote)
299 continue;
300
301 if (!of_device_is_available(remote->parent)) {
302 DRM_DEV_DEBUG(pl->dev,
303 "port%u endpoint%u remote parent is not available\n",
304 port_id, reg);
305 of_node_put(remote);
306 continue;
307 }
308
309 next_bridge[ep_cnt] = of_drm_find_bridge(remote);
310 if (!next_bridge[ep_cnt]) {
311 of_node_put(remote);
312 return ERR_PTR(-EPROBE_DEFER);
313 }
314
315 /* specially select the next bridge with companion PXL2DPI */
316 if (of_property_present(remote, "fsl,companion-pxl2dpi"))
317 bridge_sel = ep_cnt;
318
319 ep_cnt++;
320
321 of_node_put(remote);
322 }
323
324 pl->mst_addr = port_id - 1;
325
326 return next_bridge[bridge_sel];
327 }
328
imx8qxp_pixel_link_bridge_probe(struct platform_device * pdev)329 static int imx8qxp_pixel_link_bridge_probe(struct platform_device *pdev)
330 {
331 struct imx8qxp_pixel_link *pl;
332 struct device *dev = &pdev->dev;
333 struct device_node *np = dev->of_node;
334 int ret;
335
336 pl = devm_kzalloc(dev, sizeof(*pl), GFP_KERNEL);
337 if (!pl)
338 return -ENOMEM;
339
340 ret = imx_scu_get_handle(&pl->ipc_handle);
341 if (ret) {
342 if (ret != -EPROBE_DEFER)
343 DRM_DEV_ERROR(dev, "failed to get SCU ipc handle: %d\n",
344 ret);
345 return ret;
346 }
347
348 ret = of_property_read_u8(np, "fsl,dc-id", &pl->dc_id);
349 if (ret) {
350 DRM_DEV_ERROR(dev, "failed to get DC index: %d\n", ret);
351 return ret;
352 }
353
354 ret = of_property_read_u8(np, "fsl,dc-stream-id", &pl->stream_id);
355 if (ret) {
356 DRM_DEV_ERROR(dev, "failed to get DC stream index: %d\n", ret);
357 return ret;
358 }
359
360 pl->dev = dev;
361
362 pl->sink_rsc = pl->dc_id ? IMX_SC_R_DC_1 : IMX_SC_R_DC_0;
363
364 if (pl->stream_id == 0) {
365 pl->mst_addr_ctrl = IMX_SC_C_PXL_LINK_MST1_ADDR;
366 pl->mst_en_ctrl = IMX_SC_C_PXL_LINK_MST1_ENB;
367 pl->mst_vld_ctrl = IMX_SC_C_PXL_LINK_MST1_VLD;
368 pl->sync_ctrl = IMX_SC_C_SYNC_CTRL0;
369 } else {
370 pl->mst_addr_ctrl = IMX_SC_C_PXL_LINK_MST2_ADDR;
371 pl->mst_en_ctrl = IMX_SC_C_PXL_LINK_MST2_ENB;
372 pl->mst_vld_ctrl = IMX_SC_C_PXL_LINK_MST2_VLD;
373 pl->sync_ctrl = IMX_SC_C_SYNC_CTRL1;
374 }
375
376 /* disable all controls to POR default */
377 ret = imx8qxp_pixel_link_disable_all_controls(pl);
378 if (ret)
379 return ret;
380
381 pl->next_bridge = imx8qxp_pixel_link_find_next_bridge(pl);
382 if (IS_ERR(pl->next_bridge)) {
383 ret = PTR_ERR(pl->next_bridge);
384 if (ret != -EPROBE_DEFER)
385 DRM_DEV_ERROR(dev, "failed to find next bridge: %d\n",
386 ret);
387 return ret;
388 }
389
390 platform_set_drvdata(pdev, pl);
391
392 pl->bridge.driver_private = pl;
393 pl->bridge.funcs = &imx8qxp_pixel_link_bridge_funcs;
394 pl->bridge.of_node = np;
395
396 drm_bridge_add(&pl->bridge);
397
398 return ret;
399 }
400
imx8qxp_pixel_link_bridge_remove(struct platform_device * pdev)401 static void imx8qxp_pixel_link_bridge_remove(struct platform_device *pdev)
402 {
403 struct imx8qxp_pixel_link *pl = platform_get_drvdata(pdev);
404
405 drm_bridge_remove(&pl->bridge);
406 }
407
408 static const struct of_device_id imx8qxp_pixel_link_dt_ids[] = {
409 { .compatible = "fsl,imx8qm-dc-pixel-link", },
410 { .compatible = "fsl,imx8qxp-dc-pixel-link", },
411 { /* sentinel */ }
412 };
413 MODULE_DEVICE_TABLE(of, imx8qxp_pixel_link_dt_ids);
414
415 static struct platform_driver imx8qxp_pixel_link_bridge_driver = {
416 .probe = imx8qxp_pixel_link_bridge_probe,
417 .remove_new = imx8qxp_pixel_link_bridge_remove,
418 .driver = {
419 .of_match_table = imx8qxp_pixel_link_dt_ids,
420 .name = DRIVER_NAME,
421 },
422 };
423 module_platform_driver(imx8qxp_pixel_link_bridge_driver);
424
425 MODULE_DESCRIPTION("i.MX8QXP/QM display pixel link bridge driver");
426 MODULE_AUTHOR("Liu Ying <victor.liu@nxp.com>");
427 MODULE_LICENSE("GPL v2");
428 MODULE_ALIAS("platform:" DRIVER_NAME);
429