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08302c35 EA |
1 | /* |
2 | * Copyright (C) 2016 Broadcom Limited | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | /** | |
18 | * DOC: VC4 DPI module | |
19 | * | |
20 | * The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI | |
21 | * signals, which are routed out to GPIO0-27 with the ALT2 function. | |
22 | */ | |
23 | ||
24 | #include "drm_atomic_helper.h" | |
25 | #include "drm_crtc_helper.h" | |
26 | #include "drm_edid.h" | |
27 | #include "drm_panel.h" | |
28 | #include "linux/clk.h" | |
29 | #include "linux/component.h" | |
30 | #include "linux/of_graph.h" | |
31 | #include "linux/of_platform.h" | |
32 | #include "vc4_drv.h" | |
33 | #include "vc4_regs.h" | |
34 | ||
35 | #define DPI_C 0x00 | |
36 | # define DPI_OUTPUT_ENABLE_MODE BIT(16) | |
37 | ||
38 | /* The order field takes the incoming 24 bit RGB from the pixel valve | |
39 | * and shuffles the 3 channels. | |
40 | */ | |
41 | # define DPI_ORDER_MASK VC4_MASK(15, 14) | |
42 | # define DPI_ORDER_SHIFT 14 | |
43 | # define DPI_ORDER_RGB 0 | |
44 | # define DPI_ORDER_BGR 1 | |
45 | # define DPI_ORDER_GRB 2 | |
46 | # define DPI_ORDER_BRG 3 | |
47 | ||
48 | /* The format field takes the ORDER-shuffled pixel valve data and | |
49 | * formats it onto the output lines. | |
50 | */ | |
51 | # define DPI_FORMAT_MASK VC4_MASK(13, 11) | |
52 | # define DPI_FORMAT_SHIFT 11 | |
53 | /* This define is named in the hardware, but actually just outputs 0. */ | |
54 | # define DPI_FORMAT_9BIT_666_RGB 0 | |
55 | /* Outputs 00000000rrrrrggggggbbbbb */ | |
56 | # define DPI_FORMAT_16BIT_565_RGB_1 1 | |
57 | /* Outputs 000rrrrr00gggggg000bbbbb */ | |
58 | # define DPI_FORMAT_16BIT_565_RGB_2 2 | |
59 | /* Outputs 00rrrrr000gggggg00bbbbb0 */ | |
60 | # define DPI_FORMAT_16BIT_565_RGB_3 3 | |
61 | /* Outputs 000000rrrrrrggggggbbbbbb */ | |
62 | # define DPI_FORMAT_18BIT_666_RGB_1 4 | |
63 | /* Outputs 00rrrrrr00gggggg00bbbbbb */ | |
64 | # define DPI_FORMAT_18BIT_666_RGB_2 5 | |
65 | /* Outputs rrrrrrrrggggggggbbbbbbbb */ | |
66 | # define DPI_FORMAT_24BIT_888_RGB 6 | |
67 | ||
68 | /* Reverses the polarity of the corresponding signal */ | |
69 | # define DPI_PIXEL_CLK_INVERT BIT(10) | |
70 | # define DPI_HSYNC_INVERT BIT(9) | |
71 | # define DPI_VSYNC_INVERT BIT(8) | |
72 | # define DPI_OUTPUT_ENABLE_INVERT BIT(7) | |
73 | ||
74 | /* Outputs the signal the falling clock edge instead of rising. */ | |
75 | # define DPI_HSYNC_NEGATE BIT(6) | |
76 | # define DPI_VSYNC_NEGATE BIT(5) | |
77 | # define DPI_OUTPUT_ENABLE_NEGATE BIT(4) | |
78 | ||
79 | /* Disables the signal */ | |
80 | # define DPI_HSYNC_DISABLE BIT(3) | |
81 | # define DPI_VSYNC_DISABLE BIT(2) | |
82 | # define DPI_OUTPUT_ENABLE_DISABLE BIT(1) | |
83 | ||
84 | /* Power gate to the device, full reset at 0 -> 1 transition */ | |
85 | # define DPI_ENABLE BIT(0) | |
86 | ||
87 | /* All other registers besides DPI_C return the ID */ | |
88 | #define DPI_ID 0x04 | |
89 | # define DPI_ID_VALUE 0x00647069 | |
90 | ||
91 | /* General DPI hardware state. */ | |
92 | struct vc4_dpi { | |
93 | struct platform_device *pdev; | |
94 | ||
95 | struct drm_encoder *encoder; | |
96 | struct drm_connector *connector; | |
97 | struct drm_panel *panel; | |
98 | ||
99 | void __iomem *regs; | |
100 | ||
101 | struct clk *pixel_clock; | |
102 | struct clk *core_clock; | |
103 | }; | |
104 | ||
105 | #define DPI_READ(offset) readl(dpi->regs + (offset)) | |
106 | #define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset)) | |
107 | ||
108 | /* VC4 DPI encoder KMS struct */ | |
109 | struct vc4_dpi_encoder { | |
110 | struct vc4_encoder base; | |
111 | struct vc4_dpi *dpi; | |
112 | }; | |
113 | ||
114 | static inline struct vc4_dpi_encoder * | |
115 | to_vc4_dpi_encoder(struct drm_encoder *encoder) | |
116 | { | |
117 | return container_of(encoder, struct vc4_dpi_encoder, base.base); | |
118 | } | |
119 | ||
120 | /* VC4 DPI connector KMS struct */ | |
121 | struct vc4_dpi_connector { | |
122 | struct drm_connector base; | |
123 | struct vc4_dpi *dpi; | |
124 | ||
125 | /* Since the connector is attached to just the one encoder, | |
126 | * this is the reference to it so we can do the best_encoder() | |
127 | * hook. | |
128 | */ | |
129 | struct drm_encoder *encoder; | |
130 | }; | |
131 | ||
132 | static inline struct vc4_dpi_connector * | |
133 | to_vc4_dpi_connector(struct drm_connector *connector) | |
134 | { | |
135 | return container_of(connector, struct vc4_dpi_connector, base); | |
136 | } | |
137 | ||
138 | #define DPI_REG(reg) { reg, #reg } | |
139 | static const struct { | |
140 | u32 reg; | |
141 | const char *name; | |
142 | } dpi_regs[] = { | |
143 | DPI_REG(DPI_C), | |
144 | DPI_REG(DPI_ID), | |
145 | }; | |
146 | ||
147 | static void vc4_dpi_dump_regs(struct vc4_dpi *dpi) | |
148 | { | |
149 | int i; | |
150 | ||
151 | for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) { | |
152 | DRM_INFO("0x%04x (%s): 0x%08x\n", | |
153 | dpi_regs[i].reg, dpi_regs[i].name, | |
154 | DPI_READ(dpi_regs[i].reg)); | |
155 | } | |
156 | } | |
157 | ||
158 | #ifdef CONFIG_DEBUG_FS | |
159 | int vc4_dpi_debugfs_regs(struct seq_file *m, void *unused) | |
160 | { | |
161 | struct drm_info_node *node = (struct drm_info_node *)m->private; | |
162 | struct drm_device *dev = node->minor->dev; | |
163 | struct vc4_dev *vc4 = to_vc4_dev(dev); | |
164 | struct vc4_dpi *dpi = vc4->dpi; | |
165 | int i; | |
166 | ||
167 | if (!dpi) | |
168 | return 0; | |
169 | ||
170 | for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) { | |
171 | seq_printf(m, "%s (0x%04x): 0x%08x\n", | |
172 | dpi_regs[i].name, dpi_regs[i].reg, | |
173 | DPI_READ(dpi_regs[i].reg)); | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | #endif | |
179 | ||
180 | static enum drm_connector_status | |
181 | vc4_dpi_connector_detect(struct drm_connector *connector, bool force) | |
182 | { | |
183 | struct vc4_dpi_connector *vc4_connector = | |
184 | to_vc4_dpi_connector(connector); | |
185 | struct vc4_dpi *dpi = vc4_connector->dpi; | |
186 | ||
187 | if (dpi->panel) | |
188 | return connector_status_connected; | |
189 | else | |
190 | return connector_status_disconnected; | |
191 | } | |
192 | ||
193 | static void vc4_dpi_connector_destroy(struct drm_connector *connector) | |
194 | { | |
195 | drm_connector_unregister(connector); | |
196 | drm_connector_cleanup(connector); | |
197 | } | |
198 | ||
199 | static int vc4_dpi_connector_get_modes(struct drm_connector *connector) | |
200 | { | |
201 | struct vc4_dpi_connector *vc4_connector = | |
202 | to_vc4_dpi_connector(connector); | |
203 | struct vc4_dpi *dpi = vc4_connector->dpi; | |
204 | ||
205 | if (dpi->panel) | |
206 | return drm_panel_get_modes(dpi->panel); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
08302c35 EA |
211 | static const struct drm_connector_funcs vc4_dpi_connector_funcs = { |
212 | .dpms = drm_atomic_helper_connector_dpms, | |
213 | .detect = vc4_dpi_connector_detect, | |
214 | .fill_modes = drm_helper_probe_single_connector_modes, | |
215 | .destroy = vc4_dpi_connector_destroy, | |
216 | .reset = drm_atomic_helper_connector_reset, | |
217 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, | |
218 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, | |
219 | }; | |
220 | ||
221 | static const struct drm_connector_helper_funcs vc4_dpi_connector_helper_funcs = { | |
222 | .get_modes = vc4_dpi_connector_get_modes, | |
08302c35 EA |
223 | }; |
224 | ||
225 | static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev, | |
226 | struct vc4_dpi *dpi) | |
227 | { | |
228 | struct drm_connector *connector = NULL; | |
229 | struct vc4_dpi_connector *dpi_connector; | |
08302c35 EA |
230 | |
231 | dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector), | |
232 | GFP_KERNEL); | |
a9402dfe CIK |
233 | if (!dpi_connector) |
234 | return ERR_PTR(-ENOMEM); | |
235 | ||
08302c35 EA |
236 | connector = &dpi_connector->base; |
237 | ||
238 | dpi_connector->encoder = dpi->encoder; | |
239 | dpi_connector->dpi = dpi; | |
240 | ||
241 | drm_connector_init(dev, connector, &vc4_dpi_connector_funcs, | |
242 | DRM_MODE_CONNECTOR_DPI); | |
243 | drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs); | |
244 | ||
245 | connector->polled = 0; | |
246 | connector->interlace_allowed = 0; | |
247 | connector->doublescan_allowed = 0; | |
248 | ||
249 | drm_mode_connector_attach_encoder(connector, dpi->encoder); | |
250 | ||
251 | return connector; | |
08302c35 EA |
252 | } |
253 | ||
254 | static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = { | |
255 | .destroy = drm_encoder_cleanup, | |
256 | }; | |
257 | ||
258 | static void vc4_dpi_encoder_disable(struct drm_encoder *encoder) | |
259 | { | |
260 | struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder); | |
261 | struct vc4_dpi *dpi = vc4_encoder->dpi; | |
262 | ||
263 | drm_panel_disable(dpi->panel); | |
264 | ||
265 | clk_disable_unprepare(dpi->pixel_clock); | |
266 | ||
267 | drm_panel_unprepare(dpi->panel); | |
268 | } | |
269 | ||
270 | static void vc4_dpi_encoder_enable(struct drm_encoder *encoder) | |
271 | { | |
272 | struct drm_display_mode *mode = &encoder->crtc->mode; | |
273 | struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder); | |
274 | struct vc4_dpi *dpi = vc4_encoder->dpi; | |
275 | u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE; | |
276 | int ret; | |
277 | ||
278 | ret = drm_panel_prepare(dpi->panel); | |
279 | if (ret) { | |
280 | DRM_ERROR("Panel failed to prepare\n"); | |
281 | return; | |
282 | } | |
283 | ||
284 | if (dpi->connector->display_info.num_bus_formats) { | |
285 | u32 bus_format = dpi->connector->display_info.bus_formats[0]; | |
286 | ||
287 | switch (bus_format) { | |
288 | case MEDIA_BUS_FMT_RGB888_1X24: | |
289 | dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, | |
290 | DPI_FORMAT); | |
291 | break; | |
292 | case MEDIA_BUS_FMT_BGR888_1X24: | |
293 | dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, | |
294 | DPI_FORMAT); | |
295 | dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER); | |
296 | break; | |
297 | case MEDIA_BUS_FMT_RGB666_1X24_CPADHI: | |
298 | dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2, | |
299 | DPI_FORMAT); | |
300 | break; | |
301 | case MEDIA_BUS_FMT_RGB666_1X18: | |
302 | dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1, | |
303 | DPI_FORMAT); | |
304 | break; | |
305 | case MEDIA_BUS_FMT_RGB565_1X16: | |
306 | dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3, | |
307 | DPI_FORMAT); | |
308 | break; | |
309 | default: | |
310 | DRM_ERROR("Unknown media bus format %d\n", bus_format); | |
311 | break; | |
312 | } | |
313 | } | |
314 | ||
315 | if (mode->flags & DRM_MODE_FLAG_NHSYNC) | |
316 | dpi_c |= DPI_HSYNC_INVERT; | |
317 | else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC)) | |
318 | dpi_c |= DPI_HSYNC_DISABLE; | |
319 | ||
320 | if (mode->flags & DRM_MODE_FLAG_NVSYNC) | |
321 | dpi_c |= DPI_VSYNC_INVERT; | |
322 | else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC)) | |
323 | dpi_c |= DPI_VSYNC_DISABLE; | |
324 | ||
325 | DPI_WRITE(DPI_C, dpi_c); | |
326 | ||
327 | ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000); | |
328 | if (ret) | |
329 | DRM_ERROR("Failed to set clock rate: %d\n", ret); | |
330 | ||
331 | ret = clk_prepare_enable(dpi->pixel_clock); | |
332 | if (ret) | |
333 | DRM_ERROR("Failed to set clock rate: %d\n", ret); | |
334 | ||
335 | ret = drm_panel_enable(dpi->panel); | |
336 | if (ret) { | |
337 | DRM_ERROR("Panel failed to enable\n"); | |
338 | drm_panel_unprepare(dpi->panel); | |
339 | return; | |
340 | } | |
341 | } | |
342 | ||
e2298350 MK |
343 | static bool vc4_dpi_encoder_mode_fixup(struct drm_encoder *encoder, |
344 | const struct drm_display_mode *mode, | |
345 | struct drm_display_mode *adjusted_mode) | |
346 | { | |
347 | if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE) | |
348 | return false; | |
349 | ||
350 | return true; | |
351 | } | |
352 | ||
08302c35 EA |
353 | static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = { |
354 | .disable = vc4_dpi_encoder_disable, | |
355 | .enable = vc4_dpi_encoder_enable, | |
e2298350 | 356 | .mode_fixup = vc4_dpi_encoder_mode_fixup, |
08302c35 EA |
357 | }; |
358 | ||
359 | static const struct of_device_id vc4_dpi_dt_match[] = { | |
360 | { .compatible = "brcm,bcm2835-dpi", .data = NULL }, | |
361 | {} | |
362 | }; | |
363 | ||
364 | /* Walks the OF graph to find the panel node and then asks DRM to look | |
365 | * up the panel. | |
366 | */ | |
367 | static struct drm_panel *vc4_dpi_get_panel(struct device *dev) | |
368 | { | |
369 | struct device_node *endpoint, *panel_node; | |
370 | struct device_node *np = dev->of_node; | |
371 | struct drm_panel *panel; | |
372 | ||
373 | endpoint = of_graph_get_next_endpoint(np, NULL); | |
374 | if (!endpoint) { | |
375 | dev_err(dev, "no endpoint to fetch DPI panel\n"); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | /* don't proceed if we have an endpoint but no panel_node tied to it */ | |
380 | panel_node = of_graph_get_remote_port_parent(endpoint); | |
381 | of_node_put(endpoint); | |
382 | if (!panel_node) { | |
383 | dev_err(dev, "no valid panel node\n"); | |
384 | return NULL; | |
385 | } | |
386 | ||
387 | panel = of_drm_find_panel(panel_node); | |
388 | of_node_put(panel_node); | |
389 | ||
390 | return panel; | |
391 | } | |
392 | ||
393 | static int vc4_dpi_bind(struct device *dev, struct device *master, void *data) | |
394 | { | |
395 | struct platform_device *pdev = to_platform_device(dev); | |
396 | struct drm_device *drm = dev_get_drvdata(master); | |
397 | struct vc4_dev *vc4 = to_vc4_dev(drm); | |
398 | struct vc4_dpi *dpi; | |
399 | struct vc4_dpi_encoder *vc4_dpi_encoder; | |
400 | int ret; | |
401 | ||
402 | dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL); | |
403 | if (!dpi) | |
404 | return -ENOMEM; | |
405 | ||
406 | vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder), | |
407 | GFP_KERNEL); | |
408 | if (!vc4_dpi_encoder) | |
409 | return -ENOMEM; | |
410 | vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI; | |
411 | vc4_dpi_encoder->dpi = dpi; | |
412 | dpi->encoder = &vc4_dpi_encoder->base.base; | |
413 | ||
414 | dpi->pdev = pdev; | |
415 | dpi->regs = vc4_ioremap_regs(pdev, 0); | |
416 | if (IS_ERR(dpi->regs)) | |
417 | return PTR_ERR(dpi->regs); | |
418 | ||
419 | vc4_dpi_dump_regs(dpi); | |
420 | ||
421 | if (DPI_READ(DPI_ID) != DPI_ID_VALUE) { | |
422 | dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n", | |
423 | DPI_READ(DPI_ID), DPI_ID_VALUE); | |
424 | return -ENODEV; | |
425 | } | |
426 | ||
427 | dpi->core_clock = devm_clk_get(dev, "core"); | |
428 | if (IS_ERR(dpi->core_clock)) { | |
429 | ret = PTR_ERR(dpi->core_clock); | |
430 | if (ret != -EPROBE_DEFER) | |
431 | DRM_ERROR("Failed to get core clock: %d\n", ret); | |
432 | return ret; | |
433 | } | |
434 | dpi->pixel_clock = devm_clk_get(dev, "pixel"); | |
435 | if (IS_ERR(dpi->pixel_clock)) { | |
436 | ret = PTR_ERR(dpi->pixel_clock); | |
437 | if (ret != -EPROBE_DEFER) | |
438 | DRM_ERROR("Failed to get pixel clock: %d\n", ret); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | ret = clk_prepare_enable(dpi->core_clock); | |
443 | if (ret) | |
444 | DRM_ERROR("Failed to turn on core clock: %d\n", ret); | |
445 | ||
446 | dpi->panel = vc4_dpi_get_panel(dev); | |
447 | ||
448 | drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs, | |
449 | DRM_MODE_ENCODER_DPI, NULL); | |
450 | drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs); | |
451 | ||
452 | dpi->connector = vc4_dpi_connector_init(drm, dpi); | |
453 | if (IS_ERR(dpi->connector)) { | |
454 | ret = PTR_ERR(dpi->connector); | |
455 | goto err_destroy_encoder; | |
456 | } | |
457 | ||
458 | if (dpi->panel) | |
459 | drm_panel_attach(dpi->panel, dpi->connector); | |
460 | ||
461 | dev_set_drvdata(dev, dpi); | |
462 | ||
463 | vc4->dpi = dpi; | |
464 | ||
465 | return 0; | |
466 | ||
467 | err_destroy_encoder: | |
468 | drm_encoder_cleanup(dpi->encoder); | |
469 | clk_disable_unprepare(dpi->core_clock); | |
470 | return ret; | |
471 | } | |
472 | ||
473 | static void vc4_dpi_unbind(struct device *dev, struct device *master, | |
474 | void *data) | |
475 | { | |
476 | struct drm_device *drm = dev_get_drvdata(master); | |
477 | struct vc4_dev *vc4 = to_vc4_dev(drm); | |
478 | struct vc4_dpi *dpi = dev_get_drvdata(dev); | |
479 | ||
480 | if (dpi->panel) | |
481 | drm_panel_detach(dpi->panel); | |
482 | ||
483 | vc4_dpi_connector_destroy(dpi->connector); | |
484 | drm_encoder_cleanup(dpi->encoder); | |
485 | ||
486 | clk_disable_unprepare(dpi->core_clock); | |
487 | ||
488 | vc4->dpi = NULL; | |
489 | } | |
490 | ||
491 | static const struct component_ops vc4_dpi_ops = { | |
492 | .bind = vc4_dpi_bind, | |
493 | .unbind = vc4_dpi_unbind, | |
494 | }; | |
495 | ||
496 | static int vc4_dpi_dev_probe(struct platform_device *pdev) | |
497 | { | |
498 | return component_add(&pdev->dev, &vc4_dpi_ops); | |
499 | } | |
500 | ||
501 | static int vc4_dpi_dev_remove(struct platform_device *pdev) | |
502 | { | |
503 | component_del(&pdev->dev, &vc4_dpi_ops); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | struct platform_driver vc4_dpi_driver = { | |
508 | .probe = vc4_dpi_dev_probe, | |
509 | .remove = vc4_dpi_dev_remove, | |
510 | .driver = { | |
511 | .name = "vc4_dpi", | |
512 | .of_match_table = vc4_dpi_dt_match, | |
513 | }, | |
514 | }; |