exynos_drm_vidi.c

  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_print.h>
 18#include <drm/drm_probe_helper.h>
 19#include <drm/drm_simple_kms_helper.h>
 20#include <drm/drm_vblank.h>
 21#include <drm/exynos_drm.h>
 22
 23#include "exynos_drm_crtc.h"
 24#include "exynos_drm_drv.h"
 25#include "exynos_drm_fb.h"
 26#include "exynos_drm_plane.h"
 27#include "exynos_drm_vidi.h"
 28
 29/* VIDI uses fixed refresh rate of 50Hz */
 30#define VIDI_REFRESH_TIME (1000 / 50)
 31
 32/* vidi has totally three virtual windows. */
 33#define WINDOWS_NR		3
 34
 35#define ctx_from_connector(c)	container_of(c, struct vidi_context, \
 36					connector)
 37
 38struct vidi_context {
 39	struct drm_encoder		encoder;
 40	struct drm_device		*drm_dev;
 41	struct device			*dev;
 42	struct exynos_drm_crtc		*crtc;
 43	struct drm_connector		connector;
 44	struct exynos_drm_plane		planes[WINDOWS_NR];
 45	const struct drm_edid		*raw_edid;
 46	unsigned int			clkdiv;
 47	unsigned int			connected;
 48	bool				suspended;
 49	struct timer_list		timer;
 50	struct mutex			lock;
 51};
 52
 53static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
 54{
 55	return container_of(e, struct vidi_context, encoder);
 56}
 57
 58static const char fake_edid_info[] = {
 59	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
 60	0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
 61	0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
 62	0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 63	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
 64	0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
 65	0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
 66	0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
 67	0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 68	0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
 69	0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
 70	0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
 71	0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
 72	0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
 73	0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
 74	0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
 75	0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
 76	0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 80	0x00, 0x00, 0x00, 0x06
 81};
 82
 83static const uint32_t formats[] = {
 84	DRM_FORMAT_XRGB8888,
 85	DRM_FORMAT_ARGB8888,
 86	DRM_FORMAT_NV12,
 87};
 88
 89static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
 90	DRM_PLANE_TYPE_PRIMARY,
 91	DRM_PLANE_TYPE_OVERLAY,
 92	DRM_PLANE_TYPE_CURSOR,
 93};
 94
 95static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
 96{
 97	struct vidi_context *ctx = crtc->ctx;
 98
 99	if (ctx->suspended)
100		return -EPERM;
101
102	mod_timer(&ctx->timer,
103		jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
104
105	return 0;
106}
107
108static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
109{
110}
111
112static void vidi_update_plane(struct exynos_drm_crtc *crtc,
113			      struct exynos_drm_plane *plane)
114{
115	struct drm_plane_state *state = plane->base.state;
116	struct vidi_context *ctx = crtc->ctx;
117	dma_addr_t addr;
118
119	if (ctx->suspended)
120		return;
121
122	addr = exynos_drm_fb_dma_addr(state->fb, 0);
123	DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr);
124}
125
126static void vidi_atomic_enable(struct exynos_drm_crtc *crtc)
127{
128	struct vidi_context *ctx = crtc->ctx;
129
130	mutex_lock(&ctx->lock);
131
132	ctx->suspended = false;
133
134	mutex_unlock(&ctx->lock);
135
136	drm_crtc_vblank_on(&crtc->base);
137}
138
139static void vidi_atomic_disable(struct exynos_drm_crtc *crtc)
140{
141	struct vidi_context *ctx = crtc->ctx;
142
143	drm_crtc_vblank_off(&crtc->base);
144
145	mutex_lock(&ctx->lock);
146
147	ctx->suspended = true;
148
149	mutex_unlock(&ctx->lock);
150}
151
152static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
153	.atomic_enable = vidi_atomic_enable,
154	.atomic_disable = vidi_atomic_disable,
155	.enable_vblank = vidi_enable_vblank,
156	.disable_vblank = vidi_disable_vblank,
157	.update_plane = vidi_update_plane,
158	.atomic_flush = exynos_crtc_handle_event,
159};
160
161static void vidi_fake_vblank_timer(struct timer_list *t)
162{
163	struct vidi_context *ctx = timer_container_of(ctx, t, timer);
164
165	if (drm_crtc_handle_vblank(&ctx->crtc->base))
166		mod_timer(&ctx->timer,
167			jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
168}
169
170static ssize_t vidi_show_connection(struct device *dev,
171				struct device_attribute *attr, char *buf)
172{
173	struct vidi_context *ctx = dev_get_drvdata(dev);
174	int rc;
175
176	mutex_lock(&ctx->lock);
177
178	rc = sprintf(buf, "%d\n", ctx->connected);
179
180	mutex_unlock(&ctx->lock);
181
182	return rc;
183}
184
185static ssize_t vidi_store_connection(struct device *dev,
186				struct device_attribute *attr,
187				const char *buf, size_t len)
188{
189	struct vidi_context *ctx = dev_get_drvdata(dev);
190	int ret, new_connected;
191
192	ret = kstrtoint(buf, 0, &new_connected);
193	if (ret)
194		return ret;
195	if (new_connected > 1)
196		return -EINVAL;
197
198	mutex_lock(&ctx->lock);
199
200	/*
201	 * Use fake edid data for test. If raw_edid is set then it can't be
202	 * tested.
203	 */
204	if (ctx->raw_edid) {
205		DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
206		ret = -EINVAL;
207		goto fail;
208	}
209
210	ctx->connected = new_connected;
211	mutex_unlock(&ctx->lock);
212
213	DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");
214
215	drm_helper_hpd_irq_event(ctx->drm_dev);
216
217	return len;
218fail:
219	mutex_unlock(&ctx->lock);
220	return ret;
221}
222
223static DEVICE_ATTR(connection, 0644, vidi_show_connection,
224			vidi_store_connection);
225
226static struct attribute *vidi_attrs[] = {
227	&dev_attr_connection.attr,
228	NULL,
229};
230ATTRIBUTE_GROUPS(vidi);
231
232int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
233				struct drm_file *file_priv)
234{
235	struct exynos_drm_private *priv = drm_dev->dev_private;
236	struct device *dev = priv ? priv->vidi_dev : NULL;
237	struct vidi_context *ctx = dev ? dev_get_drvdata(dev) : NULL;
238	struct drm_exynos_vidi_connection *vidi = data;
239
240	if (!ctx)
241		return -ENODEV;
242
243	if (!vidi) {
244		DRM_DEV_DEBUG_KMS(ctx->dev,
245				  "user data for vidi is null.\n");
246		return -EINVAL;
247	}
248
249	if (vidi->connection > 1) {
250		DRM_DEV_DEBUG_KMS(ctx->dev,
251				  "connection should be 0 or 1.\n");
252		return -EINVAL;
253	}
254
255	mutex_lock(&ctx->lock);
256	if (ctx->connected == vidi->connection) {
257		mutex_unlock(&ctx->lock);
258		DRM_DEV_DEBUG_KMS(ctx->dev,
259				  "same connection request.\n");
260		return -EINVAL;
261	}
262	mutex_unlock(&ctx->lock);
263
264	if (vidi->connection) {
265		const struct drm_edid *drm_edid;
266		const void __user *edid_userptr = u64_to_user_ptr(vidi->edid);
267		void *edid_buf;
268		struct edid hdr;
269		size_t size;
270
271		if (copy_from_user(&hdr, edid_userptr, sizeof(hdr)))
272			return -EFAULT;
273
274		size = (hdr.extensions + 1) * EDID_LENGTH;
275
276		edid_buf = kmalloc(size, GFP_KERNEL);
277		if (!edid_buf)
278			return -ENOMEM;
279
280		if (copy_from_user(edid_buf, edid_userptr, size)) {
281			kfree(edid_buf);
282			return -EFAULT;
283		}
284
285		drm_edid = drm_edid_alloc(edid_buf, size);
286		kfree(edid_buf);
287		if (!drm_edid)
288			return -ENOMEM;
289
290		if (!drm_edid_valid(drm_edid)) {
291			drm_edid_free(drm_edid);
292			DRM_DEV_DEBUG_KMS(ctx->dev,
293					  "edid data is invalid.\n");
294			return -EINVAL;
295		}
296		mutex_lock(&ctx->lock);
297		ctx->raw_edid = drm_edid;
298		mutex_unlock(&ctx->lock);
299	} else {
300		/* with connection = 0, free raw_edid */
301		mutex_lock(&ctx->lock);
302		drm_edid_free(ctx->raw_edid);
303		ctx->raw_edid = NULL;
304		mutex_unlock(&ctx->lock);
305	}
306
307	mutex_lock(&ctx->lock);
308	ctx->connected = vidi->connection;
309	mutex_unlock(&ctx->lock);
310
311	drm_helper_hpd_irq_event(ctx->drm_dev);
312
313	return 0;
314}
315
316static 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 READ_ONCE(ctx->connected) ? connector_status_connected :
326			connector_status_disconnected;
327}
328
329static void vidi_connector_destroy(struct drm_connector *connector)
330{
331}
332
333static const struct drm_connector_funcs vidi_connector_funcs = {
334	.fill_modes = drm_helper_probe_single_connector_modes,
335	.detect = vidi_detect,
336	.destroy = vidi_connector_destroy,
337	.reset = drm_atomic_helper_connector_reset,
338	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
339	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
340};
341
342static int vidi_get_modes(struct drm_connector *connector)
343{
344	struct vidi_context *ctx = ctx_from_connector(connector);
345	const struct drm_edid *drm_edid;
346	int count;
347
348	mutex_lock(&ctx->lock);
349
350	if (ctx->raw_edid)
351		drm_edid = drm_edid_dup(ctx->raw_edid);
352	else
353		drm_edid = drm_edid_alloc(fake_edid_info, sizeof(fake_edid_info));
354
355	mutex_unlock(&ctx->lock);
356
357	drm_edid_connector_update(connector, drm_edid);
358
359	count = drm_edid_connector_add_modes(connector);
360
361	drm_edid_free(drm_edid);
362
363	return count;
364}
365
366static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
367	.get_modes = vidi_get_modes,
368};
369
370static int vidi_create_connector(struct drm_encoder *encoder)
371{
372	struct vidi_context *ctx = encoder_to_vidi(encoder);
373	struct drm_connector *connector = &ctx->connector;
374	int ret;
375
376	connector->polled = DRM_CONNECTOR_POLL_HPD;
377
378	ret = drm_connector_init(ctx->drm_dev, connector,
379			&vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
380	if (ret) {
381		DRM_DEV_ERROR(ctx->dev,
382			      "Failed to initialize connector with drm\n");
383		return ret;
384	}
385
386	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
387	drm_connector_attach_encoder(connector, encoder);
388
389	return 0;
390}
391
392static void exynos_vidi_mode_set(struct drm_encoder *encoder,
393			       struct drm_display_mode *mode,
394			       struct drm_display_mode *adjusted_mode)
395{
396}
397
398static void exynos_vidi_enable(struct drm_encoder *encoder)
399{
400}
401
402static void exynos_vidi_disable(struct drm_encoder *encoder)
403{
404}
405
406static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
407	.mode_set = exynos_vidi_mode_set,
408	.enable = exynos_vidi_enable,
409	.disable = exynos_vidi_disable,
410};
411
412static int vidi_bind(struct device *dev, struct device *master, void *data)
413{
414	struct vidi_context *ctx = dev_get_drvdata(dev);
415	struct drm_device *drm_dev = data;
416	struct exynos_drm_private *priv = drm_dev->dev_private;
417	struct drm_encoder *encoder = &ctx->encoder;
418	struct exynos_drm_plane *exynos_plane;
419	struct exynos_drm_plane_config plane_config = { 0 };
420	unsigned int i;
421	int ret;
422
423	ctx->drm_dev = drm_dev;
424	if (priv)
425		priv->vidi_dev = dev;
426
427	plane_config.pixel_formats = formats;
428	plane_config.num_pixel_formats = ARRAY_SIZE(formats);
429
430	for (i = 0; i < WINDOWS_NR; i++) {
431		plane_config.zpos = i;
432		plane_config.type = vidi_win_types[i];
433
434		ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
435					&plane_config);
436		if (ret)
437			return ret;
438	}
439
440	exynos_plane = &ctx->planes[DEFAULT_WIN];
441	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
442			EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
443	if (IS_ERR(ctx->crtc)) {
444		DRM_DEV_ERROR(dev, "failed to create crtc.\n");
445		return PTR_ERR(ctx->crtc);
446	}
447
448	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
449
450	drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
451
452	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
453	if (ret < 0)
454		return ret;
455
456	ret = vidi_create_connector(encoder);
457	if (ret) {
458		DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n",
459			      ret);
460		drm_encoder_cleanup(encoder);
461		return ret;
462	}
463
464	return 0;
465}
466
467
468static void vidi_unbind(struct device *dev, struct device *master, void *data)
469{
470	struct vidi_context *ctx = dev_get_drvdata(dev);
471	struct drm_device *drm_dev = data;
472	struct exynos_drm_private *priv = drm_dev->dev_private;
473
474	timer_delete_sync(&ctx->timer);
475	if (priv)
476		priv->vidi_dev = NULL;
477}
478
479static const struct component_ops vidi_component_ops = {
480	.bind	= vidi_bind,
481	.unbind = vidi_unbind,
482};
483
484static int vidi_probe(struct platform_device *pdev)
485{
486	struct vidi_context *ctx;
487	struct device *dev = &pdev->dev;
488
489	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
490	if (!ctx)
491		return -ENOMEM;
492
493	ctx->dev = dev;
494
495	timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);
496
497	mutex_init(&ctx->lock);
498
499	platform_set_drvdata(pdev, ctx);
500
501	return component_add(dev, &vidi_component_ops);
502}
503
504static void vidi_remove(struct platform_device *pdev)
505{
506	struct vidi_context *ctx = platform_get_drvdata(pdev);
507
508	mutex_lock(&ctx->lock);
509
510	drm_edid_free(ctx->raw_edid);
511	ctx->raw_edid = NULL;
512
513	mutex_unlock(&ctx->lock);
514
515	component_del(&pdev->dev, &vidi_component_ops);
516}
517
518struct platform_driver vidi_driver = {
519	.probe		= vidi_probe,
520	.remove		= vidi_remove,
521	.driver		= {
522		.name	= "exynos-drm-vidi",
523		.dev_groups = vidi_groups,
524	},
525};