]> git.ipfire.org Git - thirdparty/kernel/stable.git/blob - drivers/gpu/drm/udl/udl_main.c
drm/udl: add a release method and delay modeset teardown
[thirdparty/kernel/stable.git] / drivers / gpu / drm / udl / udl_main.c
1 /*
2 * Copyright (C) 2012 Red Hat
3 *
4 * based in parts on udlfb.c:
5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13 #include <drm/drmP.h>
14 #include <drm/drm_crtc_helper.h>
15 #include <drm/drm_probe_helper.h>
16 #include "udl_drv.h"
17
18 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
19 #define BULK_SIZE 512
20
21 #define NR_USB_REQUEST_CHANNEL 0x12
22
23 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
24 #define WRITES_IN_FLIGHT (4)
25 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
26
27 #define GET_URB_TIMEOUT HZ
28 #define FREE_URB_TIMEOUT (HZ*2)
29
30 static int udl_parse_vendor_descriptor(struct drm_device *dev,
31 struct usb_device *usbdev)
32 {
33 struct udl_device *udl = dev->dev_private;
34 char *desc;
35 char *buf;
36 char *desc_end;
37
38 u8 total_len = 0;
39
40 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
41 if (!buf)
42 return false;
43 desc = buf;
44
45 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
46 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
47 if (total_len > 5) {
48 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
49 total_len, desc);
50
51 if ((desc[0] != total_len) || /* descriptor length */
52 (desc[1] != 0x5f) || /* vendor descriptor type */
53 (desc[2] != 0x01) || /* version (2 bytes) */
54 (desc[3] != 0x00) ||
55 (desc[4] != total_len - 2)) /* length after type */
56 goto unrecognized;
57
58 desc_end = desc + total_len;
59 desc += 5; /* the fixed header we've already parsed */
60
61 while (desc < desc_end) {
62 u8 length;
63 u16 key;
64
65 key = le16_to_cpu(*((u16 *) desc));
66 desc += sizeof(u16);
67 length = *desc;
68 desc++;
69
70 switch (key) {
71 case 0x0200: { /* max_area */
72 u32 max_area;
73 max_area = le32_to_cpu(*((u32 *)desc));
74 DRM_DEBUG("DL chip limited to %d pixel modes\n",
75 max_area);
76 udl->sku_pixel_limit = max_area;
77 break;
78 }
79 default:
80 break;
81 }
82 desc += length;
83 }
84 }
85
86 goto success;
87
88 unrecognized:
89 /* allow udlfb to load for now even if firmware unrecognized */
90 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
91
92 success:
93 kfree(buf);
94 return true;
95 }
96
97 /*
98 * Need to ensure a channel is selected before submitting URBs
99 */
100 static int udl_select_std_channel(struct udl_device *udl)
101 {
102 int ret;
103 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
104 0x1C, 0x88, 0x5E, 0x15,
105 0x60, 0xFE, 0xC6, 0x97,
106 0x16, 0x3D, 0x47, 0xF2};
107 void *sendbuf;
108
109 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
110 if (!sendbuf)
111 return -ENOMEM;
112
113 ret = usb_control_msg(udl->udev,
114 usb_sndctrlpipe(udl->udev, 0),
115 NR_USB_REQUEST_CHANNEL,
116 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
117 sendbuf, sizeof(set_def_chn),
118 USB_CTRL_SET_TIMEOUT);
119 kfree(sendbuf);
120 return ret < 0 ? ret : 0;
121 }
122
123 static void udl_release_urb_work(struct work_struct *work)
124 {
125 struct urb_node *unode = container_of(work, struct urb_node,
126 release_urb_work.work);
127
128 up(&unode->dev->urbs.limit_sem);
129 }
130
131 void udl_urb_completion(struct urb *urb)
132 {
133 struct urb_node *unode = urb->context;
134 struct udl_device *udl = unode->dev;
135 unsigned long flags;
136
137 /* sync/async unlink faults aren't errors */
138 if (urb->status) {
139 if (!(urb->status == -ENOENT ||
140 urb->status == -ECONNRESET ||
141 urb->status == -ESHUTDOWN)) {
142 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
143 __func__, urb->status);
144 atomic_set(&udl->lost_pixels, 1);
145 }
146 }
147
148 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
149
150 spin_lock_irqsave(&udl->urbs.lock, flags);
151 list_add_tail(&unode->entry, &udl->urbs.list);
152 udl->urbs.available++;
153 spin_unlock_irqrestore(&udl->urbs.lock, flags);
154
155 #if 0
156 /*
157 * When using fb_defio, we deadlock if up() is called
158 * while another is waiting. So queue to another process.
159 */
160 if (fb_defio)
161 schedule_delayed_work(&unode->release_urb_work, 0);
162 else
163 #endif
164 up(&udl->urbs.limit_sem);
165 }
166
167 static void udl_free_urb_list(struct drm_device *dev)
168 {
169 struct udl_device *udl = dev->dev_private;
170 int count = udl->urbs.count;
171 struct list_head *node;
172 struct urb_node *unode;
173 struct urb *urb;
174
175 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
176
177 /* keep waiting and freeing, until we've got 'em all */
178 while (count--) {
179 down(&udl->urbs.limit_sem);
180
181 spin_lock_irq(&udl->urbs.lock);
182
183 node = udl->urbs.list.next; /* have reserved one with sem */
184 list_del_init(node);
185
186 spin_unlock_irq(&udl->urbs.lock);
187
188 unode = list_entry(node, struct urb_node, entry);
189 urb = unode->urb;
190
191 /* Free each separately allocated piece */
192 usb_free_coherent(urb->dev, udl->urbs.size,
193 urb->transfer_buffer, urb->transfer_dma);
194 usb_free_urb(urb);
195 kfree(node);
196 }
197 udl->urbs.count = 0;
198 }
199
200 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
201 {
202 struct udl_device *udl = dev->dev_private;
203 struct urb *urb;
204 struct urb_node *unode;
205 char *buf;
206 size_t wanted_size = count * size;
207
208 spin_lock_init(&udl->urbs.lock);
209
210 retry:
211 udl->urbs.size = size;
212 INIT_LIST_HEAD(&udl->urbs.list);
213
214 sema_init(&udl->urbs.limit_sem, 0);
215 udl->urbs.count = 0;
216 udl->urbs.available = 0;
217
218 while (udl->urbs.count * size < wanted_size) {
219 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
220 if (!unode)
221 break;
222 unode->dev = udl;
223
224 INIT_DELAYED_WORK(&unode->release_urb_work,
225 udl_release_urb_work);
226
227 urb = usb_alloc_urb(0, GFP_KERNEL);
228 if (!urb) {
229 kfree(unode);
230 break;
231 }
232 unode->urb = urb;
233
234 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
235 &urb->transfer_dma);
236 if (!buf) {
237 kfree(unode);
238 usb_free_urb(urb);
239 if (size > PAGE_SIZE) {
240 size /= 2;
241 udl_free_urb_list(dev);
242 goto retry;
243 }
244 break;
245 }
246
247 /* urb->transfer_buffer_length set to actual before submit */
248 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
249 buf, size, udl_urb_completion, unode);
250 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
251
252 list_add_tail(&unode->entry, &udl->urbs.list);
253
254 up(&udl->urbs.limit_sem);
255 udl->urbs.count++;
256 udl->urbs.available++;
257 }
258
259 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
260
261 return udl->urbs.count;
262 }
263
264 struct urb *udl_get_urb(struct drm_device *dev)
265 {
266 struct udl_device *udl = dev->dev_private;
267 int ret = 0;
268 struct list_head *entry;
269 struct urb_node *unode;
270 struct urb *urb = NULL;
271
272 /* Wait for an in-flight buffer to complete and get re-queued */
273 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
274 if (ret) {
275 atomic_set(&udl->lost_pixels, 1);
276 DRM_INFO("wait for urb interrupted: %x available: %d\n",
277 ret, udl->urbs.available);
278 goto error;
279 }
280
281 spin_lock_irq(&udl->urbs.lock);
282
283 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
284 entry = udl->urbs.list.next;
285 list_del_init(entry);
286 udl->urbs.available--;
287
288 spin_unlock_irq(&udl->urbs.lock);
289
290 unode = list_entry(entry, struct urb_node, entry);
291 urb = unode->urb;
292
293 error:
294 return urb;
295 }
296
297 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
298 {
299 struct udl_device *udl = dev->dev_private;
300 int ret;
301
302 BUG_ON(len > udl->urbs.size);
303
304 urb->transfer_buffer_length = len; /* set to actual payload len */
305 ret = usb_submit_urb(urb, GFP_ATOMIC);
306 if (ret) {
307 udl_urb_completion(urb); /* because no one else will */
308 atomic_set(&udl->lost_pixels, 1);
309 DRM_ERROR("usb_submit_urb error %x\n", ret);
310 }
311 return ret;
312 }
313
314 int udl_driver_load(struct drm_device *dev, unsigned long flags)
315 {
316 struct usb_device *udev = (void*)flags;
317 struct udl_device *udl;
318 int ret = -ENOMEM;
319
320 DRM_DEBUG("\n");
321 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
322 if (!udl)
323 return -ENOMEM;
324
325 udl->udev = udev;
326 udl->ddev = dev;
327 dev->dev_private = udl;
328
329 mutex_init(&udl->gem_lock);
330
331 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
332 ret = -ENODEV;
333 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
334 goto err;
335 }
336
337 if (udl_select_std_channel(udl))
338 DRM_ERROR("Selecting channel failed\n");
339
340 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
341 DRM_ERROR("udl_alloc_urb_list failed\n");
342 goto err;
343 }
344
345 DRM_DEBUG("\n");
346 ret = udl_modeset_init(dev);
347 if (ret)
348 goto err;
349
350 ret = udl_fbdev_init(dev);
351 if (ret)
352 goto err;
353
354 drm_kms_helper_poll_init(dev);
355
356 return 0;
357
358 err:
359 if (udl->urbs.count)
360 udl_free_urb_list(dev);
361 kfree(udl);
362 DRM_ERROR("%d\n", ret);
363 return ret;
364 }
365
366 int udl_drop_usb(struct drm_device *dev)
367 {
368 udl_free_urb_list(dev);
369 return 0;
370 }
371
372 void udl_driver_unload(struct drm_device *dev)
373 {
374 struct udl_device *udl = dev->dev_private;
375
376 drm_kms_helper_poll_fini(dev);
377
378 if (udl->urbs.count)
379 udl_free_urb_list(dev);
380
381 udl_fbdev_cleanup(dev);
382 kfree(udl);
383 }
384
385 void udl_driver_release(struct drm_device *dev)
386 {
387 udl_modeset_cleanup(dev);
388 drm_dev_fini(dev);
389 kfree(dev);
390 }