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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_fb.h"
 28 #include "exynos_drm_plane.h"
 29 #include "exynos_drm_vidi.h"
 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 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 const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
 93         DRM_PLANE_TYPE_PRIMARY,
 94         DRM_PLANE_TYPE_OVERLAY,
 95         DRM_PLANE_TYPE_CURSOR,
 96 };
 97 
 98 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
 99 {
100         struct vidi_context *ctx = crtc->ctx;
101 
102         if (ctx->suspended)
103                 return -EPERM;
104 
105         if (!test_and_set_bit(0, &ctx->irq_flags))
106                 ctx->vblank_on = true;
107 
108         ctx->direct_vblank = true;
109 
110         /*
111          * in case of page flip request, vidi_finish_pageflip function
112          * will not be called because direct_vblank is true and then
113          * that function will be called by crtc_ops->update_plane callback
114          */
115         schedule_work(&ctx->work);
116 
117         return 0;
118 }
119 
120 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
121 {
122         struct vidi_context *ctx = crtc->ctx;
123 
124         if (ctx->suspended)
125                 return;
126 
127         if (test_and_clear_bit(0, &ctx->irq_flags))
128                 ctx->vblank_on = false;
129 }
130 
131 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
132                               struct exynos_drm_plane *plane)
133 {
134         struct drm_plane_state *state = plane->base.state;
135         struct vidi_context *ctx = crtc->ctx;
136         dma_addr_t addr;
137 
138         if (ctx->suspended)
139                 return;
140 
141         addr = exynos_drm_fb_dma_addr(state->fb, 0);
142         DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);
143 
144         if (ctx->vblank_on)
145                 schedule_work(&ctx->work);
146 }
147 
148 static void vidi_enable(struct exynos_drm_crtc *crtc)
149 {
150         struct vidi_context *ctx = crtc->ctx;
151 
152         mutex_lock(&ctx->lock);
153 
154         ctx->suspended = false;
155 
156         /* if vblank was enabled status, enable it again. */
157         if (test_and_clear_bit(0, &ctx->irq_flags))
158                 vidi_enable_vblank(ctx->crtc);
159 
160         mutex_unlock(&ctx->lock);
161 }
162 
163 static void vidi_disable(struct exynos_drm_crtc *crtc)
164 {
165         struct vidi_context *ctx = crtc->ctx;
166 
167         mutex_lock(&ctx->lock);
168 
169         ctx->suspended = true;
170 
171         mutex_unlock(&ctx->lock);
172 }
173 
174 static int vidi_ctx_initialize(struct vidi_context *ctx,
175                         struct drm_device *drm_dev)
176 {
177         struct exynos_drm_private *priv = drm_dev->dev_private;
178 
179         ctx->drm_dev = drm_dev;
180         ctx->pipe = priv->pipe++;
181 
182         return 0;
183 }
184 
185 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
186         .enable = vidi_enable,
187         .disable = vidi_disable,
188         .enable_vblank = vidi_enable_vblank,
189         .disable_vblank = vidi_disable_vblank,
190         .update_plane = vidi_update_plane,
191 };
192 
193 static void vidi_fake_vblank_handler(struct work_struct *work)
194 {
195         struct vidi_context *ctx = container_of(work, struct vidi_context,
196                                         work);
197         int win;
198 
199         if (ctx->pipe < 0)
200                 return;
201 
202         /* refresh rate is about 50Hz. */
203         usleep_range(16000, 20000);
204 
205         mutex_lock(&ctx->lock);
206 
207         if (ctx->direct_vblank) {
208                 drm_crtc_handle_vblank(&ctx->crtc->base);
209                 ctx->direct_vblank = false;
210                 mutex_unlock(&ctx->lock);
211                 return;
212         }
213 
214         mutex_unlock(&ctx->lock);
215 
216         for (win = 0 ; win < WINDOWS_NR ; win++) {
217                 struct exynos_drm_plane *plane = &ctx->planes[win];
218 
219                 if (!plane->pending_fb)
220                         continue;
221 
222                 exynos_drm_crtc_finish_update(ctx->crtc, plane);
223         }
224 }
225 
226 static ssize_t vidi_show_connection(struct device *dev,
227                                 struct device_attribute *attr, char *buf)
228 {
229         struct vidi_context *ctx = dev_get_drvdata(dev);
230         int rc;
231 
232         mutex_lock(&ctx->lock);
233 
234         rc = sprintf(buf, "%d\n", ctx->connected);
235 
236         mutex_unlock(&ctx->lock);
237 
238         return rc;
239 }
240 
241 static ssize_t vidi_store_connection(struct device *dev,
242                                 struct device_attribute *attr,
243                                 const char *buf, size_t len)
244 {
245         struct vidi_context *ctx = dev_get_drvdata(dev);
246         int ret;
247 
248         ret = kstrtoint(buf, 0, &ctx->connected);
249         if (ret)
250                 return ret;
251 
252         if (ctx->connected > 1)
253                 return -EINVAL;
254 
255         /* use fake edid data for test. */
256         if (!ctx->raw_edid)
257                 ctx->raw_edid = (struct edid *)fake_edid_info;
258 
259         /* if raw_edid isn't same as fake data then it can't be tested. */
260         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
261                 DRM_DEBUG_KMS("edid data is not fake data.\n");
262                 return -EINVAL;
263         }
264 
265         DRM_DEBUG_KMS("requested connection.\n");
266 
267         drm_helper_hpd_irq_event(ctx->drm_dev);
268 
269         return len;
270 }
271 
272 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
273                         vidi_store_connection);
274 
275 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
276                                 struct drm_file *file_priv)
277 {
278         struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
279         struct drm_exynos_vidi_connection *vidi = data;
280 
281         if (!vidi) {
282                 DRM_DEBUG_KMS("user data for vidi is null.\n");
283                 return -EINVAL;
284         }
285 
286         if (vidi->connection > 1) {
287                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
288                 return -EINVAL;
289         }
290 
291         if (ctx->connected == vidi->connection) {
292                 DRM_DEBUG_KMS("same connection request.\n");
293                 return -EINVAL;
294         }
295 
296         if (vidi->connection) {
297                 struct edid *raw_edid;
298 
299                 raw_edid = (struct edid *)(unsigned long)vidi->edid;
300                 if (!drm_edid_is_valid(raw_edid)) {
301                         DRM_DEBUG_KMS("edid data is invalid.\n");
302                         return -EINVAL;
303                 }
304                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
305                 if (!ctx->raw_edid) {
306                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
307                         return -ENOMEM;
308                 }
309         } else {
310                 /*
311                  * with connection = 0, free raw_edid
312                  * only if raw edid data isn't same as fake data.
313                  */
314                 if (ctx->raw_edid && ctx->raw_edid !=
315                                 (struct edid *)fake_edid_info) {
316                         kfree(ctx->raw_edid);
317                         ctx->raw_edid = NULL;
318                 }
319         }
320 
321         ctx->connected = vidi->connection;
322         drm_helper_hpd_irq_event(ctx->drm_dev);
323 
324         return 0;
325 }
326 
327 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
328                         bool force)
329 {
330         struct vidi_context *ctx = ctx_from_connector(connector);
331 
332         /*
333          * connection request would come from user side
334          * to do hotplug through specific ioctl.
335          */
336         return ctx->connected ? connector_status_connected :
337                         connector_status_disconnected;
338 }
339 
340 static void vidi_connector_destroy(struct drm_connector *connector)
341 {
342 }
343 
344 static const struct drm_connector_funcs vidi_connector_funcs = {
345         .dpms = drm_atomic_helper_connector_dpms,
346         .fill_modes = drm_helper_probe_single_connector_modes,
347         .detect = vidi_detect,
348         .destroy = vidi_connector_destroy,
349         .reset = drm_atomic_helper_connector_reset,
350         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
351         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
352 };
353 
354 static int vidi_get_modes(struct drm_connector *connector)
355 {
356         struct vidi_context *ctx = ctx_from_connector(connector);
357         struct edid *edid;
358         int edid_len;
359 
360         /*
361          * the edid data comes from user side and it would be set
362          * to ctx->raw_edid through specific ioctl.
363          */
364         if (!ctx->raw_edid) {
365                 DRM_DEBUG_KMS("raw_edid is null.\n");
366                 return -EFAULT;
367         }
368 
369         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
370         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
371         if (!edid) {
372                 DRM_DEBUG_KMS("failed to allocate edid\n");
373                 return -ENOMEM;
374         }
375 
376         drm_mode_connector_update_edid_property(connector, edid);
377 
378         return drm_add_edid_modes(connector, edid);
379 }
380 
381 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
382 {
383         struct vidi_context *ctx = ctx_from_connector(connector);
384 
385         return &ctx->encoder;
386 }
387 
388 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
389         .get_modes = vidi_get_modes,
390         .best_encoder = vidi_best_encoder,
391 };
392 
393 static int vidi_create_connector(struct drm_encoder *encoder)
394 {
395         struct vidi_context *ctx = encoder_to_vidi(encoder);
396         struct drm_connector *connector = &ctx->connector;
397         int ret;
398 
399         connector->polled = DRM_CONNECTOR_POLL_HPD;
400 
401         ret = drm_connector_init(ctx->drm_dev, connector,
402                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
403         if (ret) {
404                 DRM_ERROR("Failed to initialize connector with drm\n");
405                 return ret;
406         }
407 
408         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
409         drm_connector_register(connector);
410         drm_mode_connector_attach_encoder(connector, encoder);
411 
412         return 0;
413 }
414 
415 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
416                                struct drm_display_mode *mode,
417                                struct drm_display_mode *adjusted_mode)
418 {
419 }
420 
421 static void exynos_vidi_enable(struct drm_encoder *encoder)
422 {
423 }
424 
425 static void exynos_vidi_disable(struct drm_encoder *encoder)
426 {
427 }
428 
429 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
430         .mode_set = exynos_vidi_mode_set,
431         .enable = exynos_vidi_enable,
432         .disable = exynos_vidi_disable,
433 };
434 
435 static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
436         .destroy = drm_encoder_cleanup,
437 };
438 
439 static int vidi_bind(struct device *dev, struct device *master, void *data)
440 {
441         struct vidi_context *ctx = dev_get_drvdata(dev);
442         struct drm_device *drm_dev = data;
443         struct drm_encoder *encoder = &ctx->encoder;
444         struct exynos_drm_plane *exynos_plane;
445         struct exynos_drm_plane_config plane_config = { 0 };
446         unsigned int i;
447         int pipe, ret;
448 
449         vidi_ctx_initialize(ctx, drm_dev);
450 
451         plane_config.pixel_formats = formats;
452         plane_config.num_pixel_formats = ARRAY_SIZE(formats);
453 
454         for (i = 0; i < WINDOWS_NR; i++) {
455                 plane_config.zpos = i;
456                 plane_config.type = vidi_win_types[i];
457 
458                 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
459                                         1 << ctx->pipe, &plane_config);
460                 if (ret)
461                         return ret;
462         }
463 
464         exynos_plane = &ctx->planes[DEFAULT_WIN];
465         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
466                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
467                                            &vidi_crtc_ops, ctx);
468         if (IS_ERR(ctx->crtc)) {
469                 DRM_ERROR("failed to create crtc.\n");
470                 return PTR_ERR(ctx->crtc);
471         }
472 
473         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
474                                                   EXYNOS_DISPLAY_TYPE_VIDI);
475         if (pipe < 0)
476                 return pipe;
477 
478         encoder->possible_crtcs = 1 << pipe;
479 
480         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
481 
482         drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
483                          DRM_MODE_ENCODER_TMDS, NULL);
484 
485         drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
486 
487         ret = vidi_create_connector(encoder);
488         if (ret) {
489                 DRM_ERROR("failed to create connector ret = %d\n", ret);
490                 drm_encoder_cleanup(encoder);
491                 return ret;
492         }
493 
494         return 0;
495 }
496 
497 
498 static void vidi_unbind(struct device *dev, struct device *master, void *data)
499 {
500 }
501 
502 static const struct component_ops vidi_component_ops = {
503         .bind   = vidi_bind,
504         .unbind = vidi_unbind,
505 };
506 
507 static int vidi_probe(struct platform_device *pdev)
508 {
509         struct vidi_context *ctx;
510         int ret;
511 
512         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
513         if (!ctx)
514                 return -ENOMEM;
515 
516         ctx->pdev = pdev;
517 
518         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
519 
520         mutex_init(&ctx->lock);
521 
522         platform_set_drvdata(pdev, ctx);
523 
524         ret = device_create_file(&pdev->dev, &dev_attr_connection);
525         if (ret < 0) {
526                 DRM_ERROR("failed to create connection sysfs.\n");
527                 return ret;
528         }
529 
530         ret = component_add(&pdev->dev, &vidi_component_ops);
531         if (ret)
532                 goto err_remove_file;
533 
534         return ret;
535 
536 err_remove_file:
537         device_remove_file(&pdev->dev, &dev_attr_connection);
538 
539         return ret;
540 }
541 
542 static int vidi_remove(struct platform_device *pdev)
543 {
544         struct vidi_context *ctx = platform_get_drvdata(pdev);
545 
546         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
547                 kfree(ctx->raw_edid);
548                 ctx->raw_edid = NULL;
549 
550                 return -EINVAL;
551         }
552 
553         component_del(&pdev->dev, &vidi_component_ops);
554 
555         return 0;
556 }
557 
558 struct platform_driver vidi_driver = {
559         .probe          = vidi_probe,
560         .remove         = vidi_remove,
561         .driver         = {
562                 .name   = "exynos-drm-vidi",
563                 .owner  = THIS_MODULE,
564         },
565 };
566 

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