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Linux/drivers/gpu/drm/exynos/exynos_drm_vidi.c

  1 /* exynos_drm_vidi.c
  2  *
  3  * Copyright (C) 2012 Samsung Electronics Co.Ltd
  4  * Authors:
  5  *      Inki Dae <inki.dae@samsung.com>
  6  *
  7  * This program is free software; you can redistribute  it and/or modify it
  8  * under  the terms of  the GNU General  Public License as published by the
  9  * Free Software Foundation;  either version 2 of the  License, or (at your
 10  * option) any later version.
 11  *
 12  */
 13 #include <drm/drmP.h>
 14 
 15 #include <linux/kernel.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/component.h>
 18 
 19 #include <drm/exynos_drm.h>
 20 
 21 #include <drm/drm_edid.h>
 22 #include <drm/drm_crtc_helper.h>
 23 #include <drm/drm_atomic_helper.h>
 24 
 25 #include "exynos_drm_drv.h"
 26 #include "exynos_drm_crtc.h"
 27 #include "exynos_drm_plane.h"
 28 #include "exynos_drm_vidi.h"
 29 
 30 /* vidi has totally three virtual windows. */
 31 #define WINDOWS_NR              3
 32 #define CURSOR_WIN              2
 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 platform_device          *pdev;
 40         struct drm_device               *drm_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 long                   irq_flags;
 47         unsigned int                    connected;
 48         bool                            vblank_on;
 49         bool                            suspended;
 50         bool                            direct_vblank;
 51         struct work_struct              work;
 52         struct mutex                    lock;
 53         int                             pipe;
 54 };
 55 
 56 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
 57 {
 58         return container_of(e, struct vidi_context, encoder);
 59 }
 60 
 61 static const char fake_edid_info[] = {
 62         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
 63         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
 64         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
 65         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 66         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
 67         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
 68         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
 69         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
 70         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 71         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
 72         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
 73         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
 74         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
 75         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
 76         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
 77         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
 78         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
 79         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
 80         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 81         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 82         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 83         0x00, 0x00, 0x00, 0x06
 84 };
 85 
 86 static const uint32_t formats[] = {
 87         DRM_FORMAT_XRGB8888,
 88         DRM_FORMAT_ARGB8888,
 89         DRM_FORMAT_NV12,
 90 };
 91 
 92 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
 93 {
 94         struct vidi_context *ctx = crtc->ctx;
 95 
 96         if (ctx->suspended)
 97                 return -EPERM;
 98 
 99         if (!test_and_set_bit(0, &ctx->irq_flags))
100                 ctx->vblank_on = true;
101 
102         ctx->direct_vblank = true;
103 
104         /*
105          * in case of page flip request, vidi_finish_pageflip function
106          * will not be called because direct_vblank is true and then
107          * that function will be called by crtc_ops->update_plane callback
108          */
109         schedule_work(&ctx->work);
110 
111         return 0;
112 }
113 
114 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
115 {
116         struct vidi_context *ctx = crtc->ctx;
117 
118         if (ctx->suspended)
119                 return;
120 
121         if (test_and_clear_bit(0, &ctx->irq_flags))
122                 ctx->vblank_on = false;
123 }
124 
125 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
126                               struct exynos_drm_plane *plane)
127 {
128         struct vidi_context *ctx = crtc->ctx;
129 
130         if (ctx->suspended)
131                 return;
132 
133         DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr);
134 
135         if (ctx->vblank_on)
136                 schedule_work(&ctx->work);
137 }
138 
139 static void vidi_enable(struct exynos_drm_crtc *crtc)
140 {
141         struct vidi_context *ctx = crtc->ctx;
142 
143         mutex_lock(&ctx->lock);
144 
145         ctx->suspended = false;
146 
147         /* if vblank was enabled status, enable it again. */
148         if (test_and_clear_bit(0, &ctx->irq_flags))
149                 vidi_enable_vblank(ctx->crtc);
150 
151         mutex_unlock(&ctx->lock);
152 }
153 
154 static void vidi_disable(struct exynos_drm_crtc *crtc)
155 {
156         struct vidi_context *ctx = crtc->ctx;
157 
158         mutex_lock(&ctx->lock);
159 
160         ctx->suspended = true;
161 
162         mutex_unlock(&ctx->lock);
163 }
164 
165 static int vidi_ctx_initialize(struct vidi_context *ctx,
166                         struct drm_device *drm_dev)
167 {
168         struct exynos_drm_private *priv = drm_dev->dev_private;
169 
170         ctx->drm_dev = drm_dev;
171         ctx->pipe = priv->pipe++;
172 
173         return 0;
174 }
175 
176 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
177         .enable = vidi_enable,
178         .disable = vidi_disable,
179         .enable_vblank = vidi_enable_vblank,
180         .disable_vblank = vidi_disable_vblank,
181         .update_plane = vidi_update_plane,
182 };
183 
184 static void vidi_fake_vblank_handler(struct work_struct *work)
185 {
186         struct vidi_context *ctx = container_of(work, struct vidi_context,
187                                         work);
188         int win;
189 
190         if (ctx->pipe < 0)
191                 return;
192 
193         /* refresh rate is about 50Hz. */
194         usleep_range(16000, 20000);
195 
196         mutex_lock(&ctx->lock);
197 
198         if (ctx->direct_vblank) {
199                 drm_crtc_handle_vblank(&ctx->crtc->base);
200                 ctx->direct_vblank = false;
201                 mutex_unlock(&ctx->lock);
202                 return;
203         }
204 
205         mutex_unlock(&ctx->lock);
206 
207         for (win = 0 ; win < WINDOWS_NR ; win++) {
208                 struct exynos_drm_plane *plane = &ctx->planes[win];
209 
210                 if (!plane->pending_fb)
211                         continue;
212 
213                 exynos_drm_crtc_finish_update(ctx->crtc, plane);
214         }
215 }
216 
217 static int vidi_show_connection(struct device *dev,
218                                 struct device_attribute *attr, char *buf)
219 {
220         struct vidi_context *ctx = dev_get_drvdata(dev);
221         int rc;
222 
223         mutex_lock(&ctx->lock);
224 
225         rc = sprintf(buf, "%d\n", ctx->connected);
226 
227         mutex_unlock(&ctx->lock);
228 
229         return rc;
230 }
231 
232 static int vidi_store_connection(struct device *dev,
233                                 struct device_attribute *attr,
234                                 const char *buf, size_t len)
235 {
236         struct vidi_context *ctx = dev_get_drvdata(dev);
237         int ret;
238 
239         ret = kstrtoint(buf, 0, &ctx->connected);
240         if (ret)
241                 return ret;
242 
243         if (ctx->connected > 1)
244                 return -EINVAL;
245 
246         /* use fake edid data for test. */
247         if (!ctx->raw_edid)
248                 ctx->raw_edid = (struct edid *)fake_edid_info;
249 
250         /* if raw_edid isn't same as fake data then it can't be tested. */
251         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
252                 DRM_DEBUG_KMS("edid data is not fake data.\n");
253                 return -EINVAL;
254         }
255 
256         DRM_DEBUG_KMS("requested connection.\n");
257 
258         drm_helper_hpd_irq_event(ctx->drm_dev);
259 
260         return len;
261 }
262 
263 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
264                         vidi_store_connection);
265 
266 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
267                                 struct drm_file *file_priv)
268 {
269         struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
270         struct drm_exynos_vidi_connection *vidi = data;
271 
272         if (!vidi) {
273                 DRM_DEBUG_KMS("user data for vidi is null.\n");
274                 return -EINVAL;
275         }
276 
277         if (vidi->connection > 1) {
278                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
279                 return -EINVAL;
280         }
281 
282         if (ctx->connected == vidi->connection) {
283                 DRM_DEBUG_KMS("same connection request.\n");
284                 return -EINVAL;
285         }
286 
287         if (vidi->connection) {
288                 struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
289                 if (!drm_edid_is_valid(raw_edid)) {
290                         DRM_DEBUG_KMS("edid data is invalid.\n");
291                         return -EINVAL;
292                 }
293                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
294                 if (!ctx->raw_edid) {
295                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
296                         return -ENOMEM;
297                 }
298         } else {
299                 /*
300                  * with connection = 0, free raw_edid
301                  * only if raw edid data isn't same as fake data.
302                  */
303                 if (ctx->raw_edid && ctx->raw_edid !=
304                                 (struct edid *)fake_edid_info) {
305                         kfree(ctx->raw_edid);
306                         ctx->raw_edid = NULL;
307                 }
308         }
309 
310         ctx->connected = vidi->connection;
311         drm_helper_hpd_irq_event(ctx->drm_dev);
312 
313         return 0;
314 }
315 
316 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
317                         bool force)
318 {
319         struct vidi_context *ctx = ctx_from_connector(connector);
320 
321         /*
322          * connection request would come from user side
323          * to do hotplug through specific ioctl.
324          */
325         return ctx->connected ? connector_status_connected :
326                         connector_status_disconnected;
327 }
328 
329 static void vidi_connector_destroy(struct drm_connector *connector)
330 {
331 }
332 
333 static struct drm_connector_funcs vidi_connector_funcs = {
334         .dpms = drm_atomic_helper_connector_dpms,
335         .fill_modes = drm_helper_probe_single_connector_modes,
336         .detect = vidi_detect,
337         .destroy = vidi_connector_destroy,
338         .reset = drm_atomic_helper_connector_reset,
339         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
340         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
341 };
342 
343 static int vidi_get_modes(struct drm_connector *connector)
344 {
345         struct vidi_context *ctx = ctx_from_connector(connector);
346         struct edid *edid;
347         int edid_len;
348 
349         /*
350          * the edid data comes from user side and it would be set
351          * to ctx->raw_edid through specific ioctl.
352          */
353         if (!ctx->raw_edid) {
354                 DRM_DEBUG_KMS("raw_edid is null.\n");
355                 return -EFAULT;
356         }
357 
358         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
359         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
360         if (!edid) {
361                 DRM_DEBUG_KMS("failed to allocate edid\n");
362                 return -ENOMEM;
363         }
364 
365         drm_mode_connector_update_edid_property(connector, edid);
366 
367         return drm_add_edid_modes(connector, edid);
368 }
369 
370 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
371 {
372         struct vidi_context *ctx = ctx_from_connector(connector);
373 
374         return &ctx->encoder;
375 }
376 
377 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
378         .get_modes = vidi_get_modes,
379         .best_encoder = vidi_best_encoder,
380 };
381 
382 static int vidi_create_connector(struct drm_encoder *encoder)
383 {
384         struct vidi_context *ctx = encoder_to_vidi(encoder);
385         struct drm_connector *connector = &ctx->connector;
386         int ret;
387 
388         connector->polled = DRM_CONNECTOR_POLL_HPD;
389 
390         ret = drm_connector_init(ctx->drm_dev, connector,
391                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
392         if (ret) {
393                 DRM_ERROR("Failed to initialize connector with drm\n");
394                 return ret;
395         }
396 
397         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
398         drm_connector_register(connector);
399         drm_mode_connector_attach_encoder(connector, encoder);
400 
401         return 0;
402 }
403 
404 static bool exynos_vidi_mode_fixup(struct drm_encoder *encoder,
405                                  const struct drm_display_mode *mode,
406                                  struct drm_display_mode *adjusted_mode)
407 {
408         return true;
409 }
410 
411 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
412                                struct drm_display_mode *mode,
413                                struct drm_display_mode *adjusted_mode)
414 {
415 }
416 
417 static void exynos_vidi_enable(struct drm_encoder *encoder)
418 {
419 }
420 
421 static void exynos_vidi_disable(struct drm_encoder *encoder)
422 {
423 }
424 
425 static struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
426         .mode_fixup = exynos_vidi_mode_fixup,
427         .mode_set = exynos_vidi_mode_set,
428         .enable = exynos_vidi_enable,
429         .disable = exynos_vidi_disable,
430 };
431 
432 static struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
433         .destroy = drm_encoder_cleanup,
434 };
435 
436 static int vidi_bind(struct device *dev, struct device *master, void *data)
437 {
438         struct vidi_context *ctx = dev_get_drvdata(dev);
439         struct drm_device *drm_dev = data;
440         struct drm_encoder *encoder = &ctx->encoder;
441         struct exynos_drm_plane *exynos_plane;
442         enum drm_plane_type type;
443         unsigned int zpos;
444         int pipe, ret;
445 
446         vidi_ctx_initialize(ctx, drm_dev);
447 
448         for (zpos = 0; zpos < WINDOWS_NR; zpos++) {
449                 type = exynos_plane_get_type(zpos, CURSOR_WIN);
450                 ret = exynos_plane_init(drm_dev, &ctx->planes[zpos],
451                                         1 << ctx->pipe, type, formats,
452                                         ARRAY_SIZE(formats), zpos);
453                 if (ret)
454                         return ret;
455         }
456 
457         exynos_plane = &ctx->planes[DEFAULT_WIN];
458         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
459                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
460                                            &vidi_crtc_ops, ctx);
461         if (IS_ERR(ctx->crtc)) {
462                 DRM_ERROR("failed to create crtc.\n");
463                 return PTR_ERR(ctx->crtc);
464         }
465 
466         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
467                                                   EXYNOS_DISPLAY_TYPE_VIDI);
468         if (pipe < 0)
469                 return pipe;
470 
471         encoder->possible_crtcs = 1 << pipe;
472 
473         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
474 
475         drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
476                          DRM_MODE_ENCODER_TMDS);
477 
478         drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
479 
480         ret = vidi_create_connector(encoder);
481         if (ret) {
482                 DRM_ERROR("failed to create connector ret = %d\n", ret);
483                 drm_encoder_cleanup(encoder);
484                 return ret;
485         }
486 
487         return 0;
488 }
489 
490 
491 static void vidi_unbind(struct device *dev, struct device *master, void *data)
492 {
493 }
494 
495 static const struct component_ops vidi_component_ops = {
496         .bind   = vidi_bind,
497         .unbind = vidi_unbind,
498 };
499 
500 static int vidi_probe(struct platform_device *pdev)
501 {
502         struct vidi_context *ctx;
503         int ret;
504 
505         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
506         if (!ctx)
507                 return -ENOMEM;
508 
509         ctx->pdev = pdev;
510 
511         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
512 
513         mutex_init(&ctx->lock);
514 
515         platform_set_drvdata(pdev, ctx);
516 
517         ret = device_create_file(&pdev->dev, &dev_attr_connection);
518         if (ret < 0) {
519                 DRM_ERROR("failed to create connection sysfs.\n");
520                 return ret;
521         }
522 
523         ret = component_add(&pdev->dev, &vidi_component_ops);
524         if (ret)
525                 goto err_remove_file;
526 
527         return ret;
528 
529 err_remove_file:
530         device_remove_file(&pdev->dev, &dev_attr_connection);
531 
532         return ret;
533 }
534 
535 static int vidi_remove(struct platform_device *pdev)
536 {
537         struct vidi_context *ctx = platform_get_drvdata(pdev);
538 
539         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
540                 kfree(ctx->raw_edid);
541                 ctx->raw_edid = NULL;
542 
543                 return -EINVAL;
544         }
545 
546         component_del(&pdev->dev, &vidi_component_ops);
547 
548         return 0;
549 }
550 
551 struct platform_driver vidi_driver = {
552         .probe          = vidi_probe,
553         .remove         = vidi_remove,
554         .driver         = {
555                 .name   = "exynos-drm-vidi",
556                 .owner  = THIS_MODULE,
557         },
558 };
559 

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