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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 #include <linux/timer.h>
 19 
 20 #include <drm/exynos_drm.h>
 21 
 22 #include <drm/drm_edid.h>
 23 #include <drm/drm_crtc_helper.h>
 24 #include <drm/drm_atomic_helper.h>
 25 
 26 #include "exynos_drm_drv.h"
 27 #include "exynos_drm_crtc.h"
 28 #include "exynos_drm_fb.h"
 29 #include "exynos_drm_plane.h"
 30 #include "exynos_drm_vidi.h"
 31 
 32 /* VIDI uses fixed refresh rate of 50Hz */
 33 #define VIDI_REFRESH_TIME (1000 / 50)
 34 
 35 /* vidi has totally three virtual windows. */
 36 #define WINDOWS_NR              3
 37 
 38 #define ctx_from_connector(c)   container_of(c, struct vidi_context, \
 39                                         connector)
 40 
 41 struct vidi_context {
 42         struct drm_encoder              encoder;
 43         struct platform_device          *pdev;
 44         struct drm_device               *drm_dev;
 45         struct exynos_drm_crtc          *crtc;
 46         struct drm_connector            connector;
 47         struct exynos_drm_plane         planes[WINDOWS_NR];
 48         struct edid                     *raw_edid;
 49         unsigned int                    clkdiv;
 50         unsigned int                    connected;
 51         bool                            suspended;
 52         struct timer_list               timer;
 53         struct mutex                    lock;
 54         int                             pipe;
 55 };
 56 
 57 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
 58 {
 59         return container_of(e, struct vidi_context, encoder);
 60 }
 61 
 62 static const char fake_edid_info[] = {
 63         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
 64         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
 65         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
 66         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 67         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
 68         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
 69         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
 70         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
 71         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 72         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
 73         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
 74         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
 75         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
 76         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
 77         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
 78         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
 79         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
 80         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 84         0x00, 0x00, 0x00, 0x06
 85 };
 86 
 87 static const uint32_t formats[] = {
 88         DRM_FORMAT_XRGB8888,
 89         DRM_FORMAT_ARGB8888,
 90         DRM_FORMAT_NV12,
 91 };
 92 
 93 static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
 94         DRM_PLANE_TYPE_PRIMARY,
 95         DRM_PLANE_TYPE_OVERLAY,
 96         DRM_PLANE_TYPE_CURSOR,
 97 };
 98 
 99 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
100 {
101         struct vidi_context *ctx = crtc->ctx;
102 
103         if (ctx->suspended)
104                 return -EPERM;
105 
106         mod_timer(&ctx->timer,
107                 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
108 
109         return 0;
110 }
111 
112 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
113 {
114 }
115 
116 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
117                               struct exynos_drm_plane *plane)
118 {
119         struct drm_plane_state *state = plane->base.state;
120         struct vidi_context *ctx = crtc->ctx;
121         dma_addr_t addr;
122 
123         if (ctx->suspended)
124                 return;
125 
126         addr = exynos_drm_fb_dma_addr(state->fb, 0);
127         DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);
128 }
129 
130 static void vidi_enable(struct exynos_drm_crtc *crtc)
131 {
132         struct vidi_context *ctx = crtc->ctx;
133 
134         mutex_lock(&ctx->lock);
135 
136         ctx->suspended = false;
137 
138         mutex_unlock(&ctx->lock);
139 
140         drm_crtc_vblank_on(&crtc->base);
141 }
142 
143 static void vidi_disable(struct exynos_drm_crtc *crtc)
144 {
145         struct vidi_context *ctx = crtc->ctx;
146 
147         drm_crtc_vblank_off(&crtc->base);
148 
149         mutex_lock(&ctx->lock);
150 
151         ctx->suspended = true;
152 
153         mutex_unlock(&ctx->lock);
154 }
155 
156 static int vidi_ctx_initialize(struct vidi_context *ctx,
157                         struct drm_device *drm_dev)
158 {
159         struct exynos_drm_private *priv = drm_dev->dev_private;
160 
161         ctx->drm_dev = drm_dev;
162         ctx->pipe = priv->pipe++;
163 
164         return 0;
165 }
166 
167 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
168         .enable = vidi_enable,
169         .disable = vidi_disable,
170         .enable_vblank = vidi_enable_vblank,
171         .disable_vblank = vidi_disable_vblank,
172         .update_plane = vidi_update_plane,
173 };
174 
175 static void vidi_fake_vblank_timer(unsigned long arg)
176 {
177         struct vidi_context *ctx = (void *)arg;
178 
179         if (ctx->pipe < 0)
180                 return;
181 
182         if (drm_crtc_handle_vblank(&ctx->crtc->base))
183                 mod_timer(&ctx->timer,
184                         jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
185 }
186 
187 static ssize_t vidi_show_connection(struct device *dev,
188                                 struct device_attribute *attr, char *buf)
189 {
190         struct vidi_context *ctx = dev_get_drvdata(dev);
191         int rc;
192 
193         mutex_lock(&ctx->lock);
194 
195         rc = sprintf(buf, "%d\n", ctx->connected);
196 
197         mutex_unlock(&ctx->lock);
198 
199         return rc;
200 }
201 
202 static ssize_t vidi_store_connection(struct device *dev,
203                                 struct device_attribute *attr,
204                                 const char *buf, size_t len)
205 {
206         struct vidi_context *ctx = dev_get_drvdata(dev);
207         int ret;
208 
209         ret = kstrtoint(buf, 0, &ctx->connected);
210         if (ret)
211                 return ret;
212 
213         if (ctx->connected > 1)
214                 return -EINVAL;
215 
216         /* use fake edid data for test. */
217         if (!ctx->raw_edid)
218                 ctx->raw_edid = (struct edid *)fake_edid_info;
219 
220         /* if raw_edid isn't same as fake data then it can't be tested. */
221         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
222                 DRM_DEBUG_KMS("edid data is not fake data.\n");
223                 return -EINVAL;
224         }
225 
226         DRM_DEBUG_KMS("requested connection.\n");
227 
228         drm_helper_hpd_irq_event(ctx->drm_dev);
229 
230         return len;
231 }
232 
233 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
234                         vidi_store_connection);
235 
236 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
237                                 struct drm_file *file_priv)
238 {
239         struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
240         struct drm_exynos_vidi_connection *vidi = data;
241 
242         if (!vidi) {
243                 DRM_DEBUG_KMS("user data for vidi is null.\n");
244                 return -EINVAL;
245         }
246 
247         if (vidi->connection > 1) {
248                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
249                 return -EINVAL;
250         }
251 
252         if (ctx->connected == vidi->connection) {
253                 DRM_DEBUG_KMS("same connection request.\n");
254                 return -EINVAL;
255         }
256 
257         if (vidi->connection) {
258                 struct edid *raw_edid;
259 
260                 raw_edid = (struct edid *)(unsigned long)vidi->edid;
261                 if (!drm_edid_is_valid(raw_edid)) {
262                         DRM_DEBUG_KMS("edid data is invalid.\n");
263                         return -EINVAL;
264                 }
265                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
266                 if (!ctx->raw_edid) {
267                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
268                         return -ENOMEM;
269                 }
270         } else {
271                 /*
272                  * with connection = 0, free raw_edid
273                  * only if raw edid data isn't same as fake data.
274                  */
275                 if (ctx->raw_edid && ctx->raw_edid !=
276                                 (struct edid *)fake_edid_info) {
277                         kfree(ctx->raw_edid);
278                         ctx->raw_edid = NULL;
279                 }
280         }
281 
282         ctx->connected = vidi->connection;
283         drm_helper_hpd_irq_event(ctx->drm_dev);
284 
285         return 0;
286 }
287 
288 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
289                         bool force)
290 {
291         struct vidi_context *ctx = ctx_from_connector(connector);
292 
293         /*
294          * connection request would come from user side
295          * to do hotplug through specific ioctl.
296          */
297         return ctx->connected ? connector_status_connected :
298                         connector_status_disconnected;
299 }
300 
301 static void vidi_connector_destroy(struct drm_connector *connector)
302 {
303 }
304 
305 static const struct drm_connector_funcs vidi_connector_funcs = {
306         .dpms = drm_atomic_helper_connector_dpms,
307         .fill_modes = drm_helper_probe_single_connector_modes,
308         .detect = vidi_detect,
309         .destroy = vidi_connector_destroy,
310         .reset = drm_atomic_helper_connector_reset,
311         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
312         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
313 };
314 
315 static int vidi_get_modes(struct drm_connector *connector)
316 {
317         struct vidi_context *ctx = ctx_from_connector(connector);
318         struct edid *edid;
319         int edid_len;
320 
321         /*
322          * the edid data comes from user side and it would be set
323          * to ctx->raw_edid through specific ioctl.
324          */
325         if (!ctx->raw_edid) {
326                 DRM_DEBUG_KMS("raw_edid is null.\n");
327                 return -EFAULT;
328         }
329 
330         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
331         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
332         if (!edid) {
333                 DRM_DEBUG_KMS("failed to allocate edid\n");
334                 return -ENOMEM;
335         }
336 
337         drm_mode_connector_update_edid_property(connector, edid);
338 
339         return drm_add_edid_modes(connector, edid);
340 }
341 
342 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
343         .get_modes = vidi_get_modes,
344 };
345 
346 static int vidi_create_connector(struct drm_encoder *encoder)
347 {
348         struct vidi_context *ctx = encoder_to_vidi(encoder);
349         struct drm_connector *connector = &ctx->connector;
350         int ret;
351 
352         connector->polled = DRM_CONNECTOR_POLL_HPD;
353 
354         ret = drm_connector_init(ctx->drm_dev, connector,
355                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
356         if (ret) {
357                 DRM_ERROR("Failed to initialize connector with drm\n");
358                 return ret;
359         }
360 
361         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
362         drm_connector_register(connector);
363         drm_mode_connector_attach_encoder(connector, encoder);
364 
365         return 0;
366 }
367 
368 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
369                                struct drm_display_mode *mode,
370                                struct drm_display_mode *adjusted_mode)
371 {
372 }
373 
374 static void exynos_vidi_enable(struct drm_encoder *encoder)
375 {
376 }
377 
378 static void exynos_vidi_disable(struct drm_encoder *encoder)
379 {
380 }
381 
382 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
383         .mode_set = exynos_vidi_mode_set,
384         .enable = exynos_vidi_enable,
385         .disable = exynos_vidi_disable,
386 };
387 
388 static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
389         .destroy = drm_encoder_cleanup,
390 };
391 
392 static int vidi_bind(struct device *dev, struct device *master, void *data)
393 {
394         struct vidi_context *ctx = dev_get_drvdata(dev);
395         struct drm_device *drm_dev = data;
396         struct drm_encoder *encoder = &ctx->encoder;
397         struct exynos_drm_plane *exynos_plane;
398         struct exynos_drm_plane_config plane_config = { 0 };
399         unsigned int i;
400         int pipe, ret;
401 
402         vidi_ctx_initialize(ctx, drm_dev);
403 
404         plane_config.pixel_formats = formats;
405         plane_config.num_pixel_formats = ARRAY_SIZE(formats);
406 
407         for (i = 0; i < WINDOWS_NR; i++) {
408                 plane_config.zpos = i;
409                 plane_config.type = vidi_win_types[i];
410 
411                 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
412                                         1 << ctx->pipe, &plane_config);
413                 if (ret)
414                         return ret;
415         }
416 
417         exynos_plane = &ctx->planes[DEFAULT_WIN];
418         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
419                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
420                                            &vidi_crtc_ops, ctx);
421         if (IS_ERR(ctx->crtc)) {
422                 DRM_ERROR("failed to create crtc.\n");
423                 return PTR_ERR(ctx->crtc);
424         }
425 
426         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
427                                                   EXYNOS_DISPLAY_TYPE_VIDI);
428         if (pipe < 0)
429                 return pipe;
430 
431         encoder->possible_crtcs = 1 << pipe;
432 
433         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
434 
435         drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
436                          DRM_MODE_ENCODER_TMDS, NULL);
437 
438         drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
439 
440         ret = vidi_create_connector(encoder);
441         if (ret) {
442                 DRM_ERROR("failed to create connector ret = %d\n", ret);
443                 drm_encoder_cleanup(encoder);
444                 return ret;
445         }
446 
447         return 0;
448 }
449 
450 
451 static void vidi_unbind(struct device *dev, struct device *master, void *data)
452 {
453         struct vidi_context *ctx = dev_get_drvdata(dev);
454 
455         del_timer_sync(&ctx->timer);
456 }
457 
458 static const struct component_ops vidi_component_ops = {
459         .bind   = vidi_bind,
460         .unbind = vidi_unbind,
461 };
462 
463 static int vidi_probe(struct platform_device *pdev)
464 {
465         struct vidi_context *ctx;
466         int ret;
467 
468         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
469         if (!ctx)
470                 return -ENOMEM;
471 
472         ctx->pdev = pdev;
473 
474         setup_timer(&ctx->timer, vidi_fake_vblank_timer, (unsigned long)ctx);
475 
476         mutex_init(&ctx->lock);
477 
478         platform_set_drvdata(pdev, ctx);
479 
480         ret = device_create_file(&pdev->dev, &dev_attr_connection);
481         if (ret < 0) {
482                 DRM_ERROR("failed to create connection sysfs.\n");
483                 return ret;
484         }
485 
486         ret = component_add(&pdev->dev, &vidi_component_ops);
487         if (ret)
488                 goto err_remove_file;
489 
490         return ret;
491 
492 err_remove_file:
493         device_remove_file(&pdev->dev, &dev_attr_connection);
494 
495         return ret;
496 }
497 
498 static int vidi_remove(struct platform_device *pdev)
499 {
500         struct vidi_context *ctx = platform_get_drvdata(pdev);
501 
502         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
503                 kfree(ctx->raw_edid);
504                 ctx->raw_edid = NULL;
505 
506                 return -EINVAL;
507         }
508 
509         component_del(&pdev->dev, &vidi_component_ops);
510 
511         return 0;
512 }
513 
514 struct platform_driver vidi_driver = {
515         .probe          = vidi_probe,
516         .remove         = vidi_remove,
517         .driver         = {
518                 .name   = "exynos-drm-vidi",
519                 .owner  = THIS_MODULE,
520         },
521 };
522 

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