1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright 2020 Noralf Trønnes
4 */
5
6 #include <linux/lz4.h>
7 #include <linux/usb.h>
8 #include <linux/vmalloc.h>
9 #include <linux/workqueue.h>
10
11 #include <drm/drm_atomic.h>
12 #include <drm/drm_connector.h>
13 #include <drm/drm_damage_helper.h>
14 #include <drm/drm_drv.h>
15 #include <drm/drm_format_helper.h>
16 #include <drm/drm_fourcc.h>
17 #include <drm/drm_framebuffer.h>
18 #include <drm/drm_gem.h>
19 #include <drm/drm_gem_atomic_helper.h>
20 #include <drm/drm_gem_framebuffer_helper.h>
21 #include <drm/drm_print.h>
22 #include <drm/drm_rect.h>
23 #include <drm/drm_simple_kms_helper.h>
24 #include <drm/gud.h>
25
26 #include "gud_internal.h"
27
28 /*
29 * Some userspace rendering loops run all displays in the same loop.
30 * This means that a fast display will have to wait for a slow one.
31 * Such users might want to enable this module parameter.
32 */
33 static bool gud_async_flush;
34 module_param_named(async_flush, gud_async_flush, bool, 0644);
35 MODULE_PARM_DESC(async_flush, "Enable asynchronous flushing [default=0]");
36
37 /*
38 * FIXME: The driver is probably broken on Big Endian machines.
39 * See discussion:
40 * https://lore.kernel.org/dri-devel/CAKb7UvihLX0hgBOP3VBG7O+atwZcUVCPVuBdfmDMpg0NjXe-cQ@mail.gmail.com/
41 */
42
gud_is_big_endian(void)43 static bool gud_is_big_endian(void)
44 {
45 #if defined(__BIG_ENDIAN)
46 return true;
47 #else
48 return false;
49 #endif
50 }
51
gud_xrgb8888_to_r124(u8 * dst,const struct drm_format_info * format,void * src,struct drm_framebuffer * fb,struct drm_rect * rect,struct drm_format_conv_state * fmtcnv_state)52 static size_t gud_xrgb8888_to_r124(u8 *dst, const struct drm_format_info *format,
53 void *src, struct drm_framebuffer *fb,
54 struct drm_rect *rect,
55 struct drm_format_conv_state *fmtcnv_state)
56 {
57 unsigned int block_width = drm_format_info_block_width(format, 0);
58 unsigned int bits_per_pixel = 8 / block_width;
59 unsigned int x, y, width, height;
60 u8 pix, *pix8, *block = dst; /* Assign to silence compiler warning */
61 struct iosys_map dst_map, vmap;
62 size_t len;
63 void *buf;
64
65 WARN_ON_ONCE(format->char_per_block[0] != 1);
66
67 /* Start on a byte boundary */
68 rect->x1 = ALIGN_DOWN(rect->x1, block_width);
69 width = drm_rect_width(rect);
70 height = drm_rect_height(rect);
71 len = drm_format_info_min_pitch(format, 0, width) * height;
72
73 buf = kmalloc(width * height, GFP_KERNEL);
74 if (!buf)
75 return 0;
76
77 iosys_map_set_vaddr(&dst_map, buf);
78 iosys_map_set_vaddr(&vmap, src);
79 drm_fb_xrgb8888_to_gray8(&dst_map, NULL, &vmap, fb, rect, fmtcnv_state);
80 pix8 = buf;
81
82 for (y = 0; y < height; y++) {
83 for (x = 0; x < width; x++) {
84 unsigned int pixpos = x % block_width; /* within byte from the left */
85 unsigned int pixshift = (block_width - pixpos - 1) * bits_per_pixel;
86
87 if (!pixpos) {
88 block = dst++;
89 *block = 0;
90 }
91
92 pix = (*pix8++) >> (8 - bits_per_pixel);
93 *block |= pix << pixshift;
94 }
95 }
96
97 kfree(buf);
98
99 return len;
100 }
101
gud_xrgb8888_to_color(u8 * dst,const struct drm_format_info * format,void * src,struct drm_framebuffer * fb,struct drm_rect * rect)102 static size_t gud_xrgb8888_to_color(u8 *dst, const struct drm_format_info *format,
103 void *src, struct drm_framebuffer *fb,
104 struct drm_rect *rect)
105 {
106 unsigned int block_width = drm_format_info_block_width(format, 0);
107 unsigned int bits_per_pixel = 8 / block_width;
108 u8 r, g, b, pix, *block = dst; /* Assign to silence compiler warning */
109 unsigned int x, y, width;
110 __le32 *sbuf32;
111 u32 pix32;
112 size_t len;
113
114 /* Start on a byte boundary */
115 rect->x1 = ALIGN_DOWN(rect->x1, block_width);
116 width = drm_rect_width(rect);
117 len = drm_format_info_min_pitch(format, 0, width) * drm_rect_height(rect);
118
119 for (y = rect->y1; y < rect->y2; y++) {
120 sbuf32 = src + (y * fb->pitches[0]);
121 sbuf32 += rect->x1;
122
123 for (x = 0; x < width; x++) {
124 unsigned int pixpos = x % block_width; /* within byte from the left */
125 unsigned int pixshift = (block_width - pixpos - 1) * bits_per_pixel;
126
127 if (!pixpos) {
128 block = dst++;
129 *block = 0;
130 }
131
132 pix32 = le32_to_cpu(*sbuf32++);
133 r = pix32 >> 16;
134 g = pix32 >> 8;
135 b = pix32;
136
137 switch (format->format) {
138 case GUD_DRM_FORMAT_XRGB1111:
139 pix = ((r >> 7) << 2) | ((g >> 7) << 1) | (b >> 7);
140 break;
141 default:
142 WARN_ON_ONCE(1);
143 return len;
144 }
145
146 *block |= pix << pixshift;
147 }
148 }
149
150 return len;
151 }
152
gud_prep_flush(struct gud_device * gdrm,struct drm_framebuffer * fb,const struct iosys_map * src,bool cached_reads,const struct drm_format_info * format,struct drm_rect * rect,struct gud_set_buffer_req * req,struct drm_format_conv_state * fmtcnv_state)153 static int gud_prep_flush(struct gud_device *gdrm, struct drm_framebuffer *fb,
154 const struct iosys_map *src, bool cached_reads,
155 const struct drm_format_info *format, struct drm_rect *rect,
156 struct gud_set_buffer_req *req,
157 struct drm_format_conv_state *fmtcnv_state)
158 {
159 u8 compression = gdrm->compression;
160 struct iosys_map dst;
161 void *vaddr, *buf;
162 size_t pitch, len;
163
164 pitch = drm_format_info_min_pitch(format, 0, drm_rect_width(rect));
165 len = pitch * drm_rect_height(rect);
166 if (len > gdrm->bulk_len)
167 return -E2BIG;
168
169 vaddr = src[0].vaddr;
170 retry:
171 if (compression)
172 buf = gdrm->compress_buf;
173 else
174 buf = gdrm->bulk_buf;
175 iosys_map_set_vaddr(&dst, buf);
176
177 /*
178 * Imported buffers are assumed to be write-combined and thus uncached
179 * with slow reads (at least on ARM).
180 */
181 if (format != fb->format) {
182 if (format->format == GUD_DRM_FORMAT_R1) {
183 len = gud_xrgb8888_to_r124(buf, format, vaddr, fb, rect, fmtcnv_state);
184 if (!len)
185 return -ENOMEM;
186 } else if (format->format == DRM_FORMAT_R8) {
187 drm_fb_xrgb8888_to_gray8(&dst, NULL, src, fb, rect, fmtcnv_state);
188 } else if (format->format == DRM_FORMAT_RGB332) {
189 drm_fb_xrgb8888_to_rgb332(&dst, NULL, src, fb, rect, fmtcnv_state);
190 } else if (format->format == DRM_FORMAT_RGB565) {
191 drm_fb_xrgb8888_to_rgb565(&dst, NULL, src, fb, rect, fmtcnv_state,
192 gud_is_big_endian());
193 } else if (format->format == DRM_FORMAT_RGB888) {
194 drm_fb_xrgb8888_to_rgb888(&dst, NULL, src, fb, rect, fmtcnv_state);
195 } else {
196 len = gud_xrgb8888_to_color(buf, format, vaddr, fb, rect);
197 }
198 } else if (gud_is_big_endian() && format->cpp[0] > 1) {
199 drm_fb_swab(&dst, NULL, src, fb, rect, cached_reads, fmtcnv_state);
200 } else if (compression && cached_reads && pitch == fb->pitches[0]) {
201 /* can compress directly from the framebuffer */
202 buf = vaddr + rect->y1 * pitch;
203 } else {
204 drm_fb_memcpy(&dst, NULL, src, fb, rect);
205 }
206
207 memset(req, 0, sizeof(*req));
208 req->x = cpu_to_le32(rect->x1);
209 req->y = cpu_to_le32(rect->y1);
210 req->width = cpu_to_le32(drm_rect_width(rect));
211 req->height = cpu_to_le32(drm_rect_height(rect));
212 req->length = cpu_to_le32(len);
213
214 if (compression & GUD_COMPRESSION_LZ4) {
215 int complen;
216
217 complen = LZ4_compress_default(buf, gdrm->bulk_buf, len, len, gdrm->lz4_comp_mem);
218 if (complen <= 0) {
219 compression = 0;
220 goto retry;
221 }
222
223 req->compression = GUD_COMPRESSION_LZ4;
224 req->compressed_length = cpu_to_le32(complen);
225 }
226
227 return 0;
228 }
229
230 struct gud_usb_bulk_context {
231 struct timer_list timer;
232 struct usb_sg_request sgr;
233 };
234
gud_usb_bulk_timeout(struct timer_list * t)235 static void gud_usb_bulk_timeout(struct timer_list *t)
236 {
237 struct gud_usb_bulk_context *ctx = from_timer(ctx, t, timer);
238
239 usb_sg_cancel(&ctx->sgr);
240 }
241
gud_usb_bulk(struct gud_device * gdrm,size_t len)242 static int gud_usb_bulk(struct gud_device *gdrm, size_t len)
243 {
244 struct gud_usb_bulk_context ctx;
245 int ret;
246
247 ret = usb_sg_init(&ctx.sgr, gud_to_usb_device(gdrm), gdrm->bulk_pipe, 0,
248 gdrm->bulk_sgt.sgl, gdrm->bulk_sgt.nents, len, GFP_KERNEL);
249 if (ret)
250 return ret;
251
252 timer_setup_on_stack(&ctx.timer, gud_usb_bulk_timeout, 0);
253 mod_timer(&ctx.timer, jiffies + msecs_to_jiffies(3000));
254
255 usb_sg_wait(&ctx.sgr);
256
257 if (!del_timer_sync(&ctx.timer))
258 ret = -ETIMEDOUT;
259 else if (ctx.sgr.status < 0)
260 ret = ctx.sgr.status;
261 else if (ctx.sgr.bytes != len)
262 ret = -EIO;
263
264 destroy_timer_on_stack(&ctx.timer);
265
266 return ret;
267 }
268
gud_flush_rect(struct gud_device * gdrm,struct drm_framebuffer * fb,const struct iosys_map * src,bool cached_reads,const struct drm_format_info * format,struct drm_rect * rect,struct drm_format_conv_state * fmtcnv_state)269 static int gud_flush_rect(struct gud_device *gdrm, struct drm_framebuffer *fb,
270 const struct iosys_map *src, bool cached_reads,
271 const struct drm_format_info *format, struct drm_rect *rect,
272 struct drm_format_conv_state *fmtcnv_state)
273 {
274 struct gud_set_buffer_req req;
275 size_t len, trlen;
276 int ret;
277
278 drm_dbg(&gdrm->drm, "Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect));
279
280 ret = gud_prep_flush(gdrm, fb, src, cached_reads, format, rect, &req, fmtcnv_state);
281 if (ret)
282 return ret;
283
284 len = le32_to_cpu(req.length);
285
286 if (req.compression)
287 trlen = le32_to_cpu(req.compressed_length);
288 else
289 trlen = len;
290
291 gdrm->stats_length += len;
292 /* Did it wrap around? */
293 if (gdrm->stats_length <= len && gdrm->stats_actual_length) {
294 gdrm->stats_length = len;
295 gdrm->stats_actual_length = 0;
296 }
297 gdrm->stats_actual_length += trlen;
298
299 if (!(gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE) || gdrm->prev_flush_failed) {
300 ret = gud_usb_set(gdrm, GUD_REQ_SET_BUFFER, 0, &req, sizeof(req));
301 if (ret)
302 return ret;
303 }
304
305 ret = gud_usb_bulk(gdrm, trlen);
306 if (ret)
307 gdrm->stats_num_errors++;
308
309 return ret;
310 }
311
gud_clear_damage(struct gud_device * gdrm)312 void gud_clear_damage(struct gud_device *gdrm)
313 {
314 gdrm->damage.x1 = INT_MAX;
315 gdrm->damage.y1 = INT_MAX;
316 gdrm->damage.x2 = 0;
317 gdrm->damage.y2 = 0;
318 }
319
gud_flush_damage(struct gud_device * gdrm,struct drm_framebuffer * fb,const struct iosys_map * src,bool cached_reads,struct drm_rect * damage)320 static void gud_flush_damage(struct gud_device *gdrm, struct drm_framebuffer *fb,
321 const struct iosys_map *src, bool cached_reads,
322 struct drm_rect *damage)
323 {
324 struct drm_format_conv_state fmtcnv_state = DRM_FORMAT_CONV_STATE_INIT;
325 const struct drm_format_info *format;
326 unsigned int i, lines;
327 size_t pitch;
328 int ret;
329
330 format = fb->format;
331 if (format->format == DRM_FORMAT_XRGB8888 && gdrm->xrgb8888_emulation_format)
332 format = gdrm->xrgb8888_emulation_format;
333
334 /* Split update if it's too big */
335 pitch = drm_format_info_min_pitch(format, 0, drm_rect_width(damage));
336 lines = drm_rect_height(damage);
337
338 if (gdrm->bulk_len < lines * pitch)
339 lines = gdrm->bulk_len / pitch;
340
341 for (i = 0; i < DIV_ROUND_UP(drm_rect_height(damage), lines); i++) {
342 struct drm_rect rect = *damage;
343
344 rect.y1 += i * lines;
345 rect.y2 = min_t(u32, rect.y1 + lines, damage->y2);
346
347 ret = gud_flush_rect(gdrm, fb, src, cached_reads, format, &rect, &fmtcnv_state);
348 if (ret) {
349 if (ret != -ENODEV && ret != -ECONNRESET &&
350 ret != -ESHUTDOWN && ret != -EPROTO)
351 dev_err_ratelimited(fb->dev->dev,
352 "Failed to flush framebuffer: error=%d\n", ret);
353 gdrm->prev_flush_failed = true;
354 break;
355 }
356 }
357
358 drm_format_conv_state_release(&fmtcnv_state);
359 }
360
gud_flush_work(struct work_struct * work)361 void gud_flush_work(struct work_struct *work)
362 {
363 struct gud_device *gdrm = container_of(work, struct gud_device, work);
364 struct iosys_map shadow_map;
365 struct drm_framebuffer *fb;
366 struct drm_rect damage;
367 int idx;
368
369 if (!drm_dev_enter(&gdrm->drm, &idx))
370 return;
371
372 mutex_lock(&gdrm->damage_lock);
373 fb = gdrm->fb;
374 gdrm->fb = NULL;
375 iosys_map_set_vaddr(&shadow_map, gdrm->shadow_buf);
376 damage = gdrm->damage;
377 gud_clear_damage(gdrm);
378 mutex_unlock(&gdrm->damage_lock);
379
380 if (!fb)
381 goto out;
382
383 gud_flush_damage(gdrm, fb, &shadow_map, true, &damage);
384
385 drm_framebuffer_put(fb);
386 out:
387 drm_dev_exit(idx);
388 }
389
gud_fb_queue_damage(struct gud_device * gdrm,struct drm_framebuffer * fb,const struct iosys_map * src,struct drm_rect * damage)390 static int gud_fb_queue_damage(struct gud_device *gdrm, struct drm_framebuffer *fb,
391 const struct iosys_map *src, struct drm_rect *damage)
392 {
393 struct drm_framebuffer *old_fb = NULL;
394 struct iosys_map shadow_map;
395
396 mutex_lock(&gdrm->damage_lock);
397
398 if (!gdrm->shadow_buf) {
399 gdrm->shadow_buf = vcalloc(fb->pitches[0], fb->height);
400 if (!gdrm->shadow_buf) {
401 mutex_unlock(&gdrm->damage_lock);
402 return -ENOMEM;
403 }
404 }
405
406 iosys_map_set_vaddr(&shadow_map, gdrm->shadow_buf);
407 iosys_map_incr(&shadow_map, drm_fb_clip_offset(fb->pitches[0], fb->format, damage));
408 drm_fb_memcpy(&shadow_map, fb->pitches, src, fb, damage);
409
410 if (fb != gdrm->fb) {
411 old_fb = gdrm->fb;
412 drm_framebuffer_get(fb);
413 gdrm->fb = fb;
414 }
415
416 gdrm->damage.x1 = min(gdrm->damage.x1, damage->x1);
417 gdrm->damage.y1 = min(gdrm->damage.y1, damage->y1);
418 gdrm->damage.x2 = max(gdrm->damage.x2, damage->x2);
419 gdrm->damage.y2 = max(gdrm->damage.y2, damage->y2);
420
421 mutex_unlock(&gdrm->damage_lock);
422
423 queue_work(system_long_wq, &gdrm->work);
424
425 if (old_fb)
426 drm_framebuffer_put(old_fb);
427
428 return 0;
429 }
430
gud_fb_handle_damage(struct gud_device * gdrm,struct drm_framebuffer * fb,const struct iosys_map * src,struct drm_rect * damage)431 static void gud_fb_handle_damage(struct gud_device *gdrm, struct drm_framebuffer *fb,
432 const struct iosys_map *src, struct drm_rect *damage)
433 {
434 int ret;
435
436 if (gdrm->flags & GUD_DISPLAY_FLAG_FULL_UPDATE)
437 drm_rect_init(damage, 0, 0, fb->width, fb->height);
438
439 if (gud_async_flush) {
440 ret = gud_fb_queue_damage(gdrm, fb, src, damage);
441 if (ret != -ENOMEM)
442 return;
443 }
444
445 /* Imported buffers are assumed to be WriteCombined with uncached reads */
446 gud_flush_damage(gdrm, fb, src, !fb->obj[0]->import_attach, damage);
447 }
448
gud_pipe_check(struct drm_simple_display_pipe * pipe,struct drm_plane_state * new_plane_state,struct drm_crtc_state * new_crtc_state)449 int gud_pipe_check(struct drm_simple_display_pipe *pipe,
450 struct drm_plane_state *new_plane_state,
451 struct drm_crtc_state *new_crtc_state)
452 {
453 struct gud_device *gdrm = to_gud_device(pipe->crtc.dev);
454 struct drm_plane_state *old_plane_state = pipe->plane.state;
455 const struct drm_display_mode *mode = &new_crtc_state->mode;
456 struct drm_atomic_state *state = new_plane_state->state;
457 struct drm_framebuffer *old_fb = old_plane_state->fb;
458 struct drm_connector_state *connector_state = NULL;
459 struct drm_framebuffer *fb = new_plane_state->fb;
460 const struct drm_format_info *format = fb->format;
461 struct drm_connector *connector;
462 unsigned int i, num_properties;
463 struct gud_state_req *req;
464 int idx, ret;
465 size_t len;
466
467 if (WARN_ON_ONCE(!fb))
468 return -EINVAL;
469
470 if (old_plane_state->rotation != new_plane_state->rotation)
471 new_crtc_state->mode_changed = true;
472
473 if (old_fb && old_fb->format != format)
474 new_crtc_state->mode_changed = true;
475
476 if (!new_crtc_state->mode_changed && !new_crtc_state->connectors_changed)
477 return 0;
478
479 /* Only one connector is supported */
480 if (hweight32(new_crtc_state->connector_mask) != 1)
481 return -EINVAL;
482
483 if (format->format == DRM_FORMAT_XRGB8888 && gdrm->xrgb8888_emulation_format)
484 format = gdrm->xrgb8888_emulation_format;
485
486 for_each_new_connector_in_state(state, connector, connector_state, i) {
487 if (connector_state->crtc)
488 break;
489 }
490
491 /*
492 * DRM_IOCTL_MODE_OBJ_SETPROPERTY on the rotation property will not have
493 * the connector included in the state.
494 */
495 if (!connector_state) {
496 struct drm_connector_list_iter conn_iter;
497
498 drm_connector_list_iter_begin(pipe->crtc.dev, &conn_iter);
499 drm_for_each_connector_iter(connector, &conn_iter) {
500 if (connector->state->crtc) {
501 connector_state = connector->state;
502 break;
503 }
504 }
505 drm_connector_list_iter_end(&conn_iter);
506 }
507
508 if (WARN_ON_ONCE(!connector_state))
509 return -ENOENT;
510
511 len = struct_size(req, properties,
512 size_add(GUD_PROPERTIES_MAX_NUM, GUD_CONNECTOR_PROPERTIES_MAX_NUM));
513 req = kzalloc(len, GFP_KERNEL);
514 if (!req)
515 return -ENOMEM;
516
517 gud_from_display_mode(&req->mode, mode);
518
519 req->format = gud_from_fourcc(format->format);
520 if (WARN_ON_ONCE(!req->format)) {
521 ret = -EINVAL;
522 goto out;
523 }
524
525 req->connector = drm_connector_index(connector_state->connector);
526
527 ret = gud_connector_fill_properties(connector_state, req->properties);
528 if (ret < 0)
529 goto out;
530
531 num_properties = ret;
532 for (i = 0; i < gdrm->num_properties; i++) {
533 u16 prop = gdrm->properties[i];
534 u64 val;
535
536 switch (prop) {
537 case GUD_PROPERTY_ROTATION:
538 /* DRM UAPI matches the protocol so use value directly */
539 val = new_plane_state->rotation;
540 break;
541 default:
542 WARN_ON_ONCE(1);
543 ret = -EINVAL;
544 goto out;
545 }
546
547 req->properties[num_properties + i].prop = cpu_to_le16(prop);
548 req->properties[num_properties + i].val = cpu_to_le64(val);
549 num_properties++;
550 }
551
552 if (drm_dev_enter(fb->dev, &idx)) {
553 len = struct_size(req, properties, num_properties);
554 ret = gud_usb_set(gdrm, GUD_REQ_SET_STATE_CHECK, 0, req, len);
555 drm_dev_exit(idx);
556 } else {
557 ret = -ENODEV;
558 }
559 out:
560 kfree(req);
561
562 return ret;
563 }
564
gud_pipe_update(struct drm_simple_display_pipe * pipe,struct drm_plane_state * old_state)565 void gud_pipe_update(struct drm_simple_display_pipe *pipe,
566 struct drm_plane_state *old_state)
567 {
568 struct drm_device *drm = pipe->crtc.dev;
569 struct gud_device *gdrm = to_gud_device(drm);
570 struct drm_plane_state *state = pipe->plane.state;
571 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
572 struct drm_framebuffer *fb = state->fb;
573 struct drm_crtc *crtc = &pipe->crtc;
574 struct drm_rect damage;
575 int ret, idx;
576
577 if (crtc->state->mode_changed || !crtc->state->enable) {
578 cancel_work_sync(&gdrm->work);
579 mutex_lock(&gdrm->damage_lock);
580 if (gdrm->fb) {
581 drm_framebuffer_put(gdrm->fb);
582 gdrm->fb = NULL;
583 }
584 gud_clear_damage(gdrm);
585 vfree(gdrm->shadow_buf);
586 gdrm->shadow_buf = NULL;
587 mutex_unlock(&gdrm->damage_lock);
588 }
589
590 if (!drm_dev_enter(drm, &idx))
591 return;
592
593 if (!old_state->fb)
594 gud_usb_set_u8(gdrm, GUD_REQ_SET_CONTROLLER_ENABLE, 1);
595
596 if (fb && (crtc->state->mode_changed || crtc->state->connectors_changed))
597 gud_usb_set(gdrm, GUD_REQ_SET_STATE_COMMIT, 0, NULL, 0);
598
599 if (crtc->state->active_changed)
600 gud_usb_set_u8(gdrm, GUD_REQ_SET_DISPLAY_ENABLE, crtc->state->active);
601
602 if (!fb)
603 goto ctrl_disable;
604
605 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
606 if (ret)
607 goto ctrl_disable;
608
609 if (drm_atomic_helper_damage_merged(old_state, state, &damage))
610 gud_fb_handle_damage(gdrm, fb, &shadow_plane_state->data[0], &damage);
611
612 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
613
614 ctrl_disable:
615 if (!crtc->state->enable)
616 gud_usb_set_u8(gdrm, GUD_REQ_SET_CONTROLLER_ENABLE, 0);
617
618 drm_dev_exit(idx);
619 }
620