1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* exynos_drm_vidi.c |
3 | * |
4 | * Copyright (C) 2012 Samsung Electronics Co.Ltd |
5 | * Authors: |
6 | * Inki Dae <inki.dae@samsung.com> |
7 | */ |
8 | |
9 | #include <linux/component.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/platform_device.h> |
12 | #include <linux/timer.h> |
13 | |
14 | #include <drm/drm_atomic_helper.h> |
15 | #include <drm/drm_edid.h> |
16 | #include <drm/drm_framebuffer.h> |
17 | #include <drm/drm_probe_helper.h> |
18 | #include <drm/drm_simple_kms_helper.h> |
19 | #include <drm/drm_vblank.h> |
20 | #include <drm/exynos_drm.h> |
21 | |
22 | #include "exynos_drm_crtc.h" |
23 | #include "exynos_drm_drv.h" |
24 | #include "exynos_drm_fb.h" |
25 | #include "exynos_drm_plane.h" |
26 | #include "exynos_drm_vidi.h" |
27 | |
28 | /* VIDI uses fixed refresh rate of 50Hz */ |
29 | #define VIDI_REFRESH_TIME (1000 / 50) |
30 | |
31 | /* vidi has totally three virtual windows. */ |
32 | #define WINDOWS_NR 3 |
33 | |
34 | #define ctx_from_connector(c) container_of(c, struct vidi_context, \ |
35 | connector) |
36 | |
37 | struct vidi_context { |
38 | struct drm_encoder encoder; |
39 | struct drm_device *drm_dev; |
40 | struct device *dev; |
41 | struct exynos_drm_crtc *crtc; |
42 | struct drm_connector connector; |
43 | struct exynos_drm_plane planes[WINDOWS_NR]; |
44 | struct edid *raw_edid; |
45 | unsigned int clkdiv; |
46 | unsigned int connected; |
47 | bool suspended; |
48 | struct timer_list timer; |
49 | struct mutex lock; |
50 | }; |
51 | |
52 | static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e) |
53 | { |
54 | return container_of(e, struct vidi_context, encoder); |
55 | } |
56 | |
57 | static const char fake_edid_info[] = { |
58 | 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05, |
59 | 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78, |
60 | 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd, |
61 | 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
62 | 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00, |
63 | 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, |
64 | 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00, |
65 | 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18, |
66 | 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, |
67 | 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, |
68 | 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1, |
69 | 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83, |
70 | 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00, |
71 | 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c, |
72 | 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a, |
73 | 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00, |
74 | 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c, |
75 | 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00, |
76 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
77 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
78 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
79 | 0x00, 0x00, 0x00, 0x06 |
80 | }; |
81 | |
82 | static const uint32_t formats[] = { |
83 | DRM_FORMAT_XRGB8888, |
84 | DRM_FORMAT_ARGB8888, |
85 | DRM_FORMAT_NV12, |
86 | }; |
87 | |
88 | static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = { |
89 | DRM_PLANE_TYPE_PRIMARY, |
90 | DRM_PLANE_TYPE_OVERLAY, |
91 | DRM_PLANE_TYPE_CURSOR, |
92 | }; |
93 | |
94 | static int vidi_enable_vblank(struct exynos_drm_crtc *crtc) |
95 | { |
96 | struct vidi_context *ctx = crtc->ctx; |
97 | |
98 | if (ctx->suspended) |
99 | return -EPERM; |
100 | |
101 | mod_timer(timer: &ctx->timer, |
102 | expires: jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1); |
103 | |
104 | return 0; |
105 | } |
106 | |
107 | static void vidi_disable_vblank(struct exynos_drm_crtc *crtc) |
108 | { |
109 | } |
110 | |
111 | static void vidi_update_plane(struct exynos_drm_crtc *crtc, |
112 | struct exynos_drm_plane *plane) |
113 | { |
114 | struct drm_plane_state *state = plane->base.state; |
115 | struct vidi_context *ctx = crtc->ctx; |
116 | dma_addr_t addr; |
117 | |
118 | if (ctx->suspended) |
119 | return; |
120 | |
121 | addr = exynos_drm_fb_dma_addr(fb: state->fb, index: 0); |
122 | DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n" , &addr); |
123 | } |
124 | |
125 | static void vidi_atomic_enable(struct exynos_drm_crtc *crtc) |
126 | { |
127 | struct vidi_context *ctx = crtc->ctx; |
128 | |
129 | mutex_lock(&ctx->lock); |
130 | |
131 | ctx->suspended = false; |
132 | |
133 | mutex_unlock(lock: &ctx->lock); |
134 | |
135 | drm_crtc_vblank_on(crtc: &crtc->base); |
136 | } |
137 | |
138 | static void vidi_atomic_disable(struct exynos_drm_crtc *crtc) |
139 | { |
140 | struct vidi_context *ctx = crtc->ctx; |
141 | |
142 | drm_crtc_vblank_off(crtc: &crtc->base); |
143 | |
144 | mutex_lock(&ctx->lock); |
145 | |
146 | ctx->suspended = true; |
147 | |
148 | mutex_unlock(lock: &ctx->lock); |
149 | } |
150 | |
151 | static const struct exynos_drm_crtc_ops vidi_crtc_ops = { |
152 | .atomic_enable = vidi_atomic_enable, |
153 | .atomic_disable = vidi_atomic_disable, |
154 | .enable_vblank = vidi_enable_vblank, |
155 | .disable_vblank = vidi_disable_vblank, |
156 | .update_plane = vidi_update_plane, |
157 | .atomic_flush = exynos_crtc_handle_event, |
158 | }; |
159 | |
160 | static void vidi_fake_vblank_timer(struct timer_list *t) |
161 | { |
162 | struct vidi_context *ctx = from_timer(ctx, t, timer); |
163 | |
164 | if (drm_crtc_handle_vblank(crtc: &ctx->crtc->base)) |
165 | mod_timer(timer: &ctx->timer, |
166 | expires: jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1); |
167 | } |
168 | |
169 | static ssize_t vidi_show_connection(struct device *dev, |
170 | struct device_attribute *attr, char *buf) |
171 | { |
172 | struct vidi_context *ctx = dev_get_drvdata(dev); |
173 | int rc; |
174 | |
175 | mutex_lock(&ctx->lock); |
176 | |
177 | rc = sprintf(buf, fmt: "%d\n" , ctx->connected); |
178 | |
179 | mutex_unlock(lock: &ctx->lock); |
180 | |
181 | return rc; |
182 | } |
183 | |
184 | static ssize_t vidi_store_connection(struct device *dev, |
185 | struct device_attribute *attr, |
186 | const char *buf, size_t len) |
187 | { |
188 | struct vidi_context *ctx = dev_get_drvdata(dev); |
189 | int ret; |
190 | |
191 | ret = kstrtoint(s: buf, base: 0, res: &ctx->connected); |
192 | if (ret) |
193 | return ret; |
194 | |
195 | if (ctx->connected > 1) |
196 | return -EINVAL; |
197 | |
198 | /* use fake edid data for test. */ |
199 | if (!ctx->raw_edid) |
200 | ctx->raw_edid = (struct edid *)fake_edid_info; |
201 | |
202 | /* if raw_edid isn't same as fake data then it can't be tested. */ |
203 | if (ctx->raw_edid != (struct edid *)fake_edid_info) { |
204 | DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n" ); |
205 | return -EINVAL; |
206 | } |
207 | |
208 | DRM_DEV_DEBUG_KMS(dev, "requested connection.\n" ); |
209 | |
210 | drm_helper_hpd_irq_event(dev: ctx->drm_dev); |
211 | |
212 | return len; |
213 | } |
214 | |
215 | static DEVICE_ATTR(connection, 0644, vidi_show_connection, |
216 | vidi_store_connection); |
217 | |
218 | static struct attribute *vidi_attrs[] = { |
219 | &dev_attr_connection.attr, |
220 | NULL, |
221 | }; |
222 | ATTRIBUTE_GROUPS(vidi); |
223 | |
224 | int vidi_connection_ioctl(struct drm_device *drm_dev, void *data, |
225 | struct drm_file *file_priv) |
226 | { |
227 | struct vidi_context *ctx = dev_get_drvdata(dev: drm_dev->dev); |
228 | struct drm_exynos_vidi_connection *vidi = data; |
229 | |
230 | if (!vidi) { |
231 | DRM_DEV_DEBUG_KMS(ctx->dev, |
232 | "user data for vidi is null.\n" ); |
233 | return -EINVAL; |
234 | } |
235 | |
236 | if (vidi->connection > 1) { |
237 | DRM_DEV_DEBUG_KMS(ctx->dev, |
238 | "connection should be 0 or 1.\n" ); |
239 | return -EINVAL; |
240 | } |
241 | |
242 | if (ctx->connected == vidi->connection) { |
243 | DRM_DEV_DEBUG_KMS(ctx->dev, |
244 | "same connection request.\n" ); |
245 | return -EINVAL; |
246 | } |
247 | |
248 | if (vidi->connection) { |
249 | struct edid *raw_edid; |
250 | |
251 | raw_edid = (struct edid *)(unsigned long)vidi->edid; |
252 | if (!drm_edid_is_valid(edid: raw_edid)) { |
253 | DRM_DEV_DEBUG_KMS(ctx->dev, |
254 | "edid data is invalid.\n" ); |
255 | return -EINVAL; |
256 | } |
257 | ctx->raw_edid = drm_edid_duplicate(edid: raw_edid); |
258 | if (!ctx->raw_edid) { |
259 | DRM_DEV_DEBUG_KMS(ctx->dev, |
260 | "failed to allocate raw_edid.\n" ); |
261 | return -ENOMEM; |
262 | } |
263 | } else { |
264 | /* |
265 | * with connection = 0, free raw_edid |
266 | * only if raw edid data isn't same as fake data. |
267 | */ |
268 | if (ctx->raw_edid && ctx->raw_edid != |
269 | (struct edid *)fake_edid_info) { |
270 | kfree(objp: ctx->raw_edid); |
271 | ctx->raw_edid = NULL; |
272 | } |
273 | } |
274 | |
275 | ctx->connected = vidi->connection; |
276 | drm_helper_hpd_irq_event(dev: ctx->drm_dev); |
277 | |
278 | return 0; |
279 | } |
280 | |
281 | static enum drm_connector_status vidi_detect(struct drm_connector *connector, |
282 | bool force) |
283 | { |
284 | struct vidi_context *ctx = ctx_from_connector(connector); |
285 | |
286 | /* |
287 | * connection request would come from user side |
288 | * to do hotplug through specific ioctl. |
289 | */ |
290 | return ctx->connected ? connector_status_connected : |
291 | connector_status_disconnected; |
292 | } |
293 | |
294 | static void vidi_connector_destroy(struct drm_connector *connector) |
295 | { |
296 | } |
297 | |
298 | static const struct drm_connector_funcs vidi_connector_funcs = { |
299 | .fill_modes = drm_helper_probe_single_connector_modes, |
300 | .detect = vidi_detect, |
301 | .destroy = vidi_connector_destroy, |
302 | .reset = drm_atomic_helper_connector_reset, |
303 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
304 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
305 | }; |
306 | |
307 | static int vidi_get_modes(struct drm_connector *connector) |
308 | { |
309 | struct vidi_context *ctx = ctx_from_connector(connector); |
310 | struct edid *edid; |
311 | int edid_len; |
312 | |
313 | /* |
314 | * the edid data comes from user side and it would be set |
315 | * to ctx->raw_edid through specific ioctl. |
316 | */ |
317 | if (!ctx->raw_edid) { |
318 | DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n" ); |
319 | return 0; |
320 | } |
321 | |
322 | edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH; |
323 | edid = kmemdup(p: ctx->raw_edid, size: edid_len, GFP_KERNEL); |
324 | if (!edid) { |
325 | DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n" ); |
326 | return 0; |
327 | } |
328 | |
329 | drm_connector_update_edid_property(connector, edid); |
330 | |
331 | return drm_add_edid_modes(connector, edid); |
332 | } |
333 | |
334 | static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = { |
335 | .get_modes = vidi_get_modes, |
336 | }; |
337 | |
338 | static int vidi_create_connector(struct drm_encoder *encoder) |
339 | { |
340 | struct vidi_context *ctx = encoder_to_vidi(e: encoder); |
341 | struct drm_connector *connector = &ctx->connector; |
342 | int ret; |
343 | |
344 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
345 | |
346 | ret = drm_connector_init(dev: ctx->drm_dev, connector, |
347 | funcs: &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL); |
348 | if (ret) { |
349 | DRM_DEV_ERROR(ctx->dev, |
350 | "Failed to initialize connector with drm\n" ); |
351 | return ret; |
352 | } |
353 | |
354 | drm_connector_helper_add(connector, funcs: &vidi_connector_helper_funcs); |
355 | drm_connector_attach_encoder(connector, encoder); |
356 | |
357 | return 0; |
358 | } |
359 | |
360 | static void exynos_vidi_mode_set(struct drm_encoder *encoder, |
361 | struct drm_display_mode *mode, |
362 | struct drm_display_mode *adjusted_mode) |
363 | { |
364 | } |
365 | |
366 | static void exynos_vidi_enable(struct drm_encoder *encoder) |
367 | { |
368 | } |
369 | |
370 | static void exynos_vidi_disable(struct drm_encoder *encoder) |
371 | { |
372 | } |
373 | |
374 | static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = { |
375 | .mode_set = exynos_vidi_mode_set, |
376 | .enable = exynos_vidi_enable, |
377 | .disable = exynos_vidi_disable, |
378 | }; |
379 | |
380 | static int vidi_bind(struct device *dev, struct device *master, void *data) |
381 | { |
382 | struct vidi_context *ctx = dev_get_drvdata(dev); |
383 | struct drm_device *drm_dev = data; |
384 | struct drm_encoder *encoder = &ctx->encoder; |
385 | struct exynos_drm_plane *exynos_plane; |
386 | struct exynos_drm_plane_config plane_config = { 0 }; |
387 | unsigned int i; |
388 | int ret; |
389 | |
390 | ctx->drm_dev = drm_dev; |
391 | |
392 | plane_config.pixel_formats = formats; |
393 | plane_config.num_pixel_formats = ARRAY_SIZE(formats); |
394 | |
395 | for (i = 0; i < WINDOWS_NR; i++) { |
396 | plane_config.zpos = i; |
397 | plane_config.type = vidi_win_types[i]; |
398 | |
399 | ret = exynos_plane_init(dev: drm_dev, exynos_plane: &ctx->planes[i], index: i, |
400 | config: &plane_config); |
401 | if (ret) |
402 | return ret; |
403 | } |
404 | |
405 | exynos_plane = &ctx->planes[DEFAULT_WIN]; |
406 | ctx->crtc = exynos_drm_crtc_create(drm_dev, plane: &exynos_plane->base, |
407 | out_type: EXYNOS_DISPLAY_TYPE_VIDI, ops: &vidi_crtc_ops, context: ctx); |
408 | if (IS_ERR(ptr: ctx->crtc)) { |
409 | DRM_DEV_ERROR(dev, "failed to create crtc.\n" ); |
410 | return PTR_ERR(ptr: ctx->crtc); |
411 | } |
412 | |
413 | drm_simple_encoder_init(dev: drm_dev, encoder, DRM_MODE_ENCODER_TMDS); |
414 | |
415 | drm_encoder_helper_add(encoder, funcs: &exynos_vidi_encoder_helper_funcs); |
416 | |
417 | ret = exynos_drm_set_possible_crtcs(encoder, out_type: EXYNOS_DISPLAY_TYPE_VIDI); |
418 | if (ret < 0) |
419 | return ret; |
420 | |
421 | ret = vidi_create_connector(encoder); |
422 | if (ret) { |
423 | DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n" , |
424 | ret); |
425 | drm_encoder_cleanup(encoder); |
426 | return ret; |
427 | } |
428 | |
429 | return 0; |
430 | } |
431 | |
432 | |
433 | static void vidi_unbind(struct device *dev, struct device *master, void *data) |
434 | { |
435 | struct vidi_context *ctx = dev_get_drvdata(dev); |
436 | |
437 | del_timer_sync(timer: &ctx->timer); |
438 | } |
439 | |
440 | static const struct component_ops vidi_component_ops = { |
441 | .bind = vidi_bind, |
442 | .unbind = vidi_unbind, |
443 | }; |
444 | |
445 | static int vidi_probe(struct platform_device *pdev) |
446 | { |
447 | struct vidi_context *ctx; |
448 | struct device *dev = &pdev->dev; |
449 | |
450 | ctx = devm_kzalloc(dev, size: sizeof(*ctx), GFP_KERNEL); |
451 | if (!ctx) |
452 | return -ENOMEM; |
453 | |
454 | ctx->dev = dev; |
455 | |
456 | timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0); |
457 | |
458 | mutex_init(&ctx->lock); |
459 | |
460 | platform_set_drvdata(pdev, data: ctx); |
461 | |
462 | return component_add(dev, &vidi_component_ops); |
463 | } |
464 | |
465 | static void vidi_remove(struct platform_device *pdev) |
466 | { |
467 | struct vidi_context *ctx = platform_get_drvdata(pdev); |
468 | |
469 | if (ctx->raw_edid != (struct edid *)fake_edid_info) { |
470 | kfree(objp: ctx->raw_edid); |
471 | ctx->raw_edid = NULL; |
472 | } |
473 | |
474 | component_del(&pdev->dev, &vidi_component_ops); |
475 | } |
476 | |
477 | struct platform_driver vidi_driver = { |
478 | .probe = vidi_probe, |
479 | .remove_new = vidi_remove, |
480 | .driver = { |
481 | .name = "exynos-drm-vidi" , |
482 | .owner = THIS_MODULE, |
483 | .dev_groups = vidi_groups, |
484 | }, |
485 | }; |
486 | |