1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Red Hat
4 *
5 * based in parts on udlfb.c:
6 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
7 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
8 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
9 */
10
11 #include <drm/drm.h>
12 #include <drm/drm_print.h>
13 #include <drm/drm_probe_helper.h>
14
15 #include "udl_drv.h"
16
17 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
18 #define BULK_SIZE 512
19
20 #define NR_USB_REQUEST_CHANNEL 0x12
21
22 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
23 #define WRITES_IN_FLIGHT (4)
24 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
25
26 #define GET_URB_TIMEOUT HZ
27 #define FREE_URB_TIMEOUT (HZ*2)
28
udl_parse_vendor_descriptor(struct drm_device * dev,struct usb_device * usbdev)29 static int udl_parse_vendor_descriptor(struct drm_device *dev,
30 struct usb_device *usbdev)
31 {
32 struct udl_device *udl = to_udl(dev);
33 char *desc;
34 char *buf;
35 char *desc_end;
36
37 u8 total_len = 0;
38
39 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
40 if (!buf)
41 return false;
42 desc = buf;
43
44 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
45 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
46 if (total_len > 5) {
47 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
48 total_len, desc);
49
50 if ((desc[0] != total_len) || /* descriptor length */
51 (desc[1] != 0x5f) || /* vendor descriptor type */
52 (desc[2] != 0x01) || /* version (2 bytes) */
53 (desc[3] != 0x00) ||
54 (desc[4] != total_len - 2)) /* length after type */
55 goto unrecognized;
56
57 desc_end = desc + total_len;
58 desc += 5; /* the fixed header we've already parsed */
59
60 while (desc < desc_end) {
61 u8 length;
62 u16 key;
63
64 key = le16_to_cpu(*((u16 *) desc));
65 desc += sizeof(u16);
66 length = *desc;
67 desc++;
68
69 switch (key) {
70 case 0x0200: { /* max_area */
71 u32 max_area;
72 max_area = le32_to_cpu(*((u32 *)desc));
73 DRM_DEBUG("DL chip limited to %d pixel modes\n",
74 max_area);
75 udl->sku_pixel_limit = max_area;
76 break;
77 }
78 default:
79 break;
80 }
81 desc += length;
82 }
83 }
84
85 goto success;
86
87 unrecognized:
88 /* allow udlfb to load for now even if firmware unrecognized */
89 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
90
91 success:
92 kfree(buf);
93 return true;
94 }
95
96 /*
97 * Need to ensure a channel is selected before submitting URBs
98 */
udl_select_std_channel(struct udl_device * udl)99 static int udl_select_std_channel(struct udl_device *udl)
100 {
101 int ret;
102 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
103 0x1C, 0x88, 0x5E, 0x15,
104 0x60, 0xFE, 0xC6, 0x97,
105 0x16, 0x3D, 0x47, 0xF2};
106 void *sendbuf;
107
108 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
109 if (!sendbuf)
110 return -ENOMEM;
111
112 ret = usb_control_msg(udl->udev,
113 usb_sndctrlpipe(udl->udev, 0),
114 NR_USB_REQUEST_CHANNEL,
115 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
116 sendbuf, sizeof(set_def_chn),
117 USB_CTRL_SET_TIMEOUT);
118 kfree(sendbuf);
119 return ret < 0 ? ret : 0;
120 }
121
udl_release_urb_work(struct work_struct * work)122 static void udl_release_urb_work(struct work_struct *work)
123 {
124 struct urb_node *unode = container_of(work, struct urb_node,
125 release_urb_work.work);
126
127 up(&unode->dev->urbs.limit_sem);
128 }
129
udl_urb_completion(struct urb * urb)130 void udl_urb_completion(struct urb *urb)
131 {
132 struct urb_node *unode = urb->context;
133 struct udl_device *udl = unode->dev;
134 unsigned long flags;
135
136 /* sync/async unlink faults aren't errors */
137 if (urb->status) {
138 if (!(urb->status == -ENOENT ||
139 urb->status == -ECONNRESET ||
140 urb->status == -ESHUTDOWN)) {
141 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
142 __func__, urb->status);
143 }
144 }
145
146 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
147
148 spin_lock_irqsave(&udl->urbs.lock, flags);
149 list_add_tail(&unode->entry, &udl->urbs.list);
150 udl->urbs.available++;
151 spin_unlock_irqrestore(&udl->urbs.lock, flags);
152
153 #if 0
154 /*
155 * When using fb_defio, we deadlock if up() is called
156 * while another is waiting. So queue to another process.
157 */
158 if (fb_defio)
159 schedule_delayed_work(&unode->release_urb_work, 0);
160 else
161 #endif
162 up(&udl->urbs.limit_sem);
163 }
164
udl_free_urb_list(struct drm_device * dev)165 static void udl_free_urb_list(struct drm_device *dev)
166 {
167 struct udl_device *udl = to_udl(dev);
168 int count = udl->urbs.count;
169 struct list_head *node;
170 struct urb_node *unode;
171 struct urb *urb;
172
173 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
174
175 /* keep waiting and freeing, until we've got 'em all */
176 while (count--) {
177 down(&udl->urbs.limit_sem);
178
179 spin_lock_irq(&udl->urbs.lock);
180
181 node = udl->urbs.list.next; /* have reserved one with sem */
182 list_del_init(node);
183
184 spin_unlock_irq(&udl->urbs.lock);
185
186 unode = list_entry(node, struct urb_node, entry);
187 urb = unode->urb;
188
189 /* Free each separately allocated piece */
190 usb_free_coherent(urb->dev, udl->urbs.size,
191 urb->transfer_buffer, urb->transfer_dma);
192 usb_free_urb(urb);
193 kfree(node);
194 }
195 udl->urbs.count = 0;
196 }
197
udl_alloc_urb_list(struct drm_device * dev,int count,size_t size)198 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
199 {
200 struct udl_device *udl = to_udl(dev);
201 struct urb *urb;
202 struct urb_node *unode;
203 char *buf;
204 size_t wanted_size = count * size;
205
206 spin_lock_init(&udl->urbs.lock);
207
208 retry:
209 udl->urbs.size = size;
210 INIT_LIST_HEAD(&udl->urbs.list);
211
212 sema_init(&udl->urbs.limit_sem, 0);
213 udl->urbs.count = 0;
214 udl->urbs.available = 0;
215
216 while (udl->urbs.count * size < wanted_size) {
217 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
218 if (!unode)
219 break;
220 unode->dev = udl;
221
222 INIT_DELAYED_WORK(&unode->release_urb_work,
223 udl_release_urb_work);
224
225 urb = usb_alloc_urb(0, GFP_KERNEL);
226 if (!urb) {
227 kfree(unode);
228 break;
229 }
230 unode->urb = urb;
231
232 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
233 &urb->transfer_dma);
234 if (!buf) {
235 kfree(unode);
236 usb_free_urb(urb);
237 if (size > PAGE_SIZE) {
238 size /= 2;
239 udl_free_urb_list(dev);
240 goto retry;
241 }
242 break;
243 }
244
245 /* urb->transfer_buffer_length set to actual before submit */
246 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
247 buf, size, udl_urb_completion, unode);
248 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
249
250 list_add_tail(&unode->entry, &udl->urbs.list);
251
252 up(&udl->urbs.limit_sem);
253 udl->urbs.count++;
254 udl->urbs.available++;
255 }
256
257 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
258
259 return udl->urbs.count;
260 }
261
udl_get_urb(struct drm_device * dev)262 struct urb *udl_get_urb(struct drm_device *dev)
263 {
264 struct udl_device *udl = to_udl(dev);
265 int ret = 0;
266 struct list_head *entry;
267 struct urb_node *unode;
268 struct urb *urb = NULL;
269
270 /* Wait for an in-flight buffer to complete and get re-queued */
271 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
272 if (ret) {
273 DRM_INFO("wait for urb interrupted: %x available: %d\n",
274 ret, udl->urbs.available);
275 goto error;
276 }
277
278 spin_lock_irq(&udl->urbs.lock);
279
280 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
281 entry = udl->urbs.list.next;
282 list_del_init(entry);
283 udl->urbs.available--;
284
285 spin_unlock_irq(&udl->urbs.lock);
286
287 unode = list_entry(entry, struct urb_node, entry);
288 urb = unode->urb;
289
290 error:
291 return urb;
292 }
293
udl_submit_urb(struct drm_device * dev,struct urb * urb,size_t len)294 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
295 {
296 struct udl_device *udl = to_udl(dev);
297 int ret;
298
299 BUG_ON(len > udl->urbs.size);
300
301 urb->transfer_buffer_length = len; /* set to actual payload len */
302 ret = usb_submit_urb(urb, GFP_ATOMIC);
303 if (ret) {
304 udl_urb_completion(urb); /* because no one else will */
305 DRM_ERROR("usb_submit_urb error %x\n", ret);
306 }
307 return ret;
308 }
309
udl_init(struct udl_device * udl)310 int udl_init(struct udl_device *udl)
311 {
312 struct drm_device *dev = &udl->drm;
313 int ret = -ENOMEM;
314
315 DRM_DEBUG("\n");
316
317 udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
318 if (!udl->dmadev)
319 drm_warn(dev, "buffer sharing not supported"); /* not an error */
320
321 mutex_init(&udl->gem_lock);
322
323 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
324 ret = -ENODEV;
325 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
326 goto err;
327 }
328
329 if (udl_select_std_channel(udl))
330 DRM_ERROR("Selecting channel failed\n");
331
332 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
333 DRM_ERROR("udl_alloc_urb_list failed\n");
334 goto err;
335 }
336
337 DRM_DEBUG("\n");
338 ret = udl_modeset_init(dev);
339 if (ret)
340 goto err;
341
342 drm_kms_helper_poll_init(dev);
343
344 return 0;
345
346 err:
347 if (udl->urbs.count)
348 udl_free_urb_list(dev);
349 put_device(udl->dmadev);
350 DRM_ERROR("%d\n", ret);
351 return ret;
352 }
353
udl_drop_usb(struct drm_device * dev)354 int udl_drop_usb(struct drm_device *dev)
355 {
356 struct udl_device *udl = to_udl(dev);
357
358 udl_free_urb_list(dev);
359 put_device(udl->dmadev);
360 udl->dmadev = NULL;
361
362 return 0;
363 }
364