1 // SPDX-License-Identifier: GPL-2.0-only
3 * udlfb.c -- Framebuffer driver for DisplayLink USB controller
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>
9 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
10 * usb-skeleton by GregKH.
12 * Device-specific portions based on information from Displaylink, with work
13 * from Florian Echtler, Henrik Bjerregaard Pedersen, and others.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/usb.h>
20 #include <linux/uaccess.h>
23 #include <linux/vmalloc.h>
24 #include <linux/slab.h>
25 #include <linux/delay.h>
26 #include <asm/unaligned.h>
27 #include <video/udlfb.h>
30 static const struct fb_fix_screeninfo dlfb_fix = {
32 .type = FB_TYPE_PACKED_PIXELS,
33 .visual = FB_VISUAL_TRUECOLOR,
37 .accel = FB_ACCEL_NONE,
40 static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
42 FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
43 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
46 * There are many DisplayLink-based graphics products, all with unique PIDs.
47 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
48 * We also require a match on SubClass (0x00) and Protocol (0x00),
49 * which is compatible with all known USB 2.0 era graphics chips and firmware,
50 * but allows DisplayLink to increment those for any future incompatible chips
52 static const struct usb_device_id id_table[] = {
54 .bInterfaceClass = 0xff,
55 .bInterfaceSubClass = 0x00,
56 .bInterfaceProtocol = 0x00,
57 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
58 USB_DEVICE_ID_MATCH_INT_CLASS |
59 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
60 USB_DEVICE_ID_MATCH_INT_PROTOCOL,
64 MODULE_DEVICE_TABLE(usb, id_table);
67 static bool console = true; /* Allow fbcon to open framebuffer */
68 static bool fb_defio = true; /* Detect mmap writes using page faults */
69 static bool shadow = true; /* Optionally disable shadow framebuffer */
70 static int pixel_limit; /* Optionally force a pixel resolution limit */
72 struct dlfb_deferred_free {
73 struct list_head list;
77 static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len);
79 /* dlfb keeps a list of urbs for efficient bulk transfers */
80 static void dlfb_urb_completion(struct urb *urb);
81 static struct urb *dlfb_get_urb(struct dlfb_data *dlfb);
82 static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len);
83 static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size);
84 static void dlfb_free_urb_list(struct dlfb_data *dlfb);
87 * All DisplayLink bulk operations start with 0xAF, followed by specific code
88 * All operations are written to buffers which then later get sent to device
90 static char *dlfb_set_register(char *buf, u8 reg, u8 val)
99 static char *dlfb_vidreg_lock(char *buf)
101 return dlfb_set_register(buf, 0xFF, 0x00);
104 static char *dlfb_vidreg_unlock(char *buf)
106 return dlfb_set_register(buf, 0xFF, 0xFF);
110 * Map FB_BLANK_* to DisplayLink register
112 * ----- -----------------------------
113 * 0x00 FB_BLANK_UNBLANK (0)
115 * 0x03 FB_BLANK_VSYNC_SUSPEND (2)
116 * 0x05 FB_BLANK_HSYNC_SUSPEND (3)
117 * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back
119 static char *dlfb_blanking(char *buf, int fb_blank)
124 case FB_BLANK_POWERDOWN:
127 case FB_BLANK_HSYNC_SUSPEND:
130 case FB_BLANK_VSYNC_SUSPEND:
133 case FB_BLANK_NORMAL:
140 buf = dlfb_set_register(buf, 0x1F, reg);
145 static char *dlfb_set_color_depth(char *buf, u8 selection)
147 return dlfb_set_register(buf, 0x00, selection);
150 static char *dlfb_set_base16bpp(char *wrptr, u32 base)
152 /* the base pointer is 16 bits wide, 0x20 is hi byte. */
153 wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);
154 wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);
155 return dlfb_set_register(wrptr, 0x22, base);
159 * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
160 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
162 static char *dlfb_set_base8bpp(char *wrptr, u32 base)
164 wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
165 wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);
166 return dlfb_set_register(wrptr, 0x28, base);
169 static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)
171 wrptr = dlfb_set_register(wrptr, reg, value >> 8);
172 return dlfb_set_register(wrptr, reg+1, value);
176 * This is kind of weird because the controller takes some
177 * register values in a different byte order than other registers.
179 static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
181 wrptr = dlfb_set_register(wrptr, reg, value);
182 return dlfb_set_register(wrptr, reg+1, value >> 8);
186 * LFSR is linear feedback shift register. The reason we have this is
187 * because the display controller needs to minimize the clock depth of
188 * various counters used in the display path. So this code reverses the
189 * provided value into the lfsr16 value by counting backwards to get
190 * the value that needs to be set in the hardware comparator to get the
191 * same actual count. This makes sense once you read above a couple of
192 * times and think about it from a hardware perspective.
194 static u16 dlfb_lfsr16(u16 actual_count)
196 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
198 while (actual_count--) {
200 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))
208 * This does LFSR conversion on the value that is to be written.
209 * See LFSR explanation above for more detail.
211 static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
213 return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
217 * This takes a standard fbdev screeninfo struct and all of its monitor mode
218 * details and converts them into the DisplayLink equivalent register commands.
220 static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)
226 /* x display start */
227 xds = var->left_margin + var->hsync_len;
228 wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
230 xde = xds + var->xres;
231 wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
233 /* y display start */
234 yds = var->upper_margin + var->vsync_len;
235 wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
237 yde = yds + var->yres;
238 wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
240 /* x end count is active + blanking - 1 */
241 wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
242 xde + var->right_margin - 1);
244 /* libdlo hardcodes hsync start to 1 */
245 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
247 /* hsync end is width of sync pulse + 1 */
248 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
250 /* hpixels is active pixels */
251 wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);
253 /* yendcount is vertical active + vertical blanking */
254 yec = var->yres + var->upper_margin + var->lower_margin +
256 wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
258 /* libdlo hardcodes vsync start to 0 */
259 wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
261 /* vsync end is width of vsync pulse */
262 wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);
264 /* vpixels is active pixels */
265 wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);
267 /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */
268 wrptr = dlfb_set_register_16be(wrptr, 0x1B,
269 200*1000*1000/var->pixclock);
275 * This takes a standard fbdev screeninfo struct that was fetched or prepared
276 * and then generates the appropriate command sequence that then drives the
277 * display controller.
279 static int dlfb_set_video_mode(struct dlfb_data *dlfb,
280 struct fb_var_screeninfo *var)
288 if (!atomic_read(&dlfb->usb_active))
291 urb = dlfb_get_urb(dlfb);
295 buf = (char *) urb->transfer_buffer;
298 * This first section has to do with setting the base address on the
299 * controller * associated with the display. There are 2 base
300 * pointers, currently, we only * use the 16 bpp segment.
302 wrptr = dlfb_vidreg_lock(buf);
303 wrptr = dlfb_set_color_depth(wrptr, 0x00);
304 /* set base for 16bpp segment to 0 */
305 wrptr = dlfb_set_base16bpp(wrptr, 0);
306 /* set base for 8bpp segment to end of fb */
307 wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len);
309 wrptr = dlfb_set_vid_cmds(wrptr, var);
310 wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);
311 wrptr = dlfb_vidreg_unlock(wrptr);
313 writesize = wrptr - buf;
315 retval = dlfb_submit_urb(dlfb, urb, writesize);
317 dlfb->blank_mode = FB_BLANK_UNBLANK;
322 static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
324 unsigned long start = vma->vm_start;
325 unsigned long size = vma->vm_end - vma->vm_start;
326 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
327 unsigned long page, pos;
329 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
331 if (size > info->fix.smem_len)
333 if (offset > info->fix.smem_len - size)
336 pos = (unsigned long)info->fix.smem_start + offset;
338 dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n",
342 page = vmalloc_to_pfn((void *)pos);
343 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
348 if (size > PAGE_SIZE)
358 * Trims identical data from front and back of line
359 * Sets new front buffer address and width
360 * And returns byte count of identical pixels
361 * Assumes CPU natural alignment (unsigned long)
362 * for back and front buffer ptrs and width
364 static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)
367 const unsigned long *back = (const unsigned long *) bback;
368 const unsigned long *front = (const unsigned long *) *bfront;
369 const int width = *width_bytes / sizeof(unsigned long);
370 int identical = width;
374 for (j = 0; j < width; j++) {
375 if (back[j] != front[j]) {
381 for (k = width - 1; k > j; k--) {
382 if (back[k] != front[k]) {
388 identical = start + (width - end);
389 *bfront = (u8 *) &front[start];
390 *width_bytes = (end - start) * sizeof(unsigned long);
392 return identical * sizeof(unsigned long);
396 * Render a command stream for an encoded horizontal line segment of pixels.
398 * A command buffer holds several commands.
399 * It always begins with a fresh command header
400 * (the protocol doesn't require this, but we enforce it to allow
401 * multiple buffers to be potentially encoded and sent in parallel).
402 * A single command encodes one contiguous horizontal line of pixels
404 * The function relies on the client to do all allocation, so that
405 * rendering can be done directly to output buffers (e.g. USB URBs).
406 * The function fills the supplied command buffer, providing information
407 * on where it left off, so the client may call in again with additional
408 * buffers if the line will take several buffers to complete.
410 * A single command can transmit a maximum of 256 pixels,
411 * regardless of the compression ratio (protocol design limit).
412 * To the hardware, 0 for a size byte means 256
414 * Rather than 256 pixel commands which are either rl or raw encoded,
415 * the rlx command simply assumes alternating raw and rl spans within one cmd.
416 * This has a slightly larger header overhead, but produces more even results.
417 * It also processes all data (read and write) in a single pass.
418 * Performance benchmarks of common cases show it having just slightly better
419 * compression than 256 pixel raw or rle commands, with similar CPU consumpion.
420 * But for very rl friendly data, will compress not quite as well.
422 static void dlfb_compress_hline(
423 const uint16_t **pixel_start_ptr,
424 const uint16_t *const pixel_end,
425 uint32_t *device_address_ptr,
426 uint8_t **command_buffer_ptr,
427 const uint8_t *const cmd_buffer_end,
428 unsigned long back_buffer_offset,
431 const uint16_t *pixel = *pixel_start_ptr;
432 uint32_t dev_addr = *device_address_ptr;
433 uint8_t *cmd = *command_buffer_ptr;
435 while ((pixel_end > pixel) &&
436 (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
437 uint8_t *raw_pixels_count_byte = NULL;
438 uint8_t *cmd_pixels_count_byte = NULL;
439 const uint16_t *raw_pixel_start = NULL;
440 const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL;
442 if (back_buffer_offset &&
443 *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) {
452 *cmd++ = dev_addr >> 16;
453 *cmd++ = dev_addr >> 8;
456 cmd_pixels_count_byte = cmd++; /* we'll know this later */
457 cmd_pixel_start = pixel;
459 raw_pixels_count_byte = cmd++; /* we'll know this later */
460 raw_pixel_start = pixel;
462 cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL,
463 (unsigned long)(pixel_end - pixel),
464 (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP);
466 if (back_buffer_offset) {
467 /* note: the framebuffer may change under us, so we must test for underflow */
468 while (cmd_pixel_end - 1 > pixel &&
469 *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset))
473 while (pixel < cmd_pixel_end) {
474 const uint16_t * const repeating_pixel = pixel;
475 u16 pixel_value = *pixel;
477 put_unaligned_be16(pixel_value, cmd);
478 if (back_buffer_offset)
479 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value;
483 if (unlikely((pixel < cmd_pixel_end) &&
484 (*pixel == pixel_value))) {
485 /* go back and fill in raw pixel count */
486 *raw_pixels_count_byte = ((repeating_pixel -
487 raw_pixel_start) + 1) & 0xFF;
490 if (back_buffer_offset)
491 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value;
493 } while ((pixel < cmd_pixel_end) &&
494 (*pixel == pixel_value));
496 /* immediately after raw data is repeat byte */
497 *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF;
499 /* Then start another raw pixel span */
500 raw_pixel_start = pixel;
501 raw_pixels_count_byte = cmd++;
505 if (pixel > raw_pixel_start) {
506 /* finalize last RAW span */
507 *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;
509 /* undo unused byte */
513 *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;
514 dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start;
517 if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) {
518 /* Fill leftover bytes with no-ops */
519 if (cmd_buffer_end > cmd)
520 memset(cmd, 0xAF, cmd_buffer_end - cmd);
521 cmd = (uint8_t *) cmd_buffer_end;
524 *command_buffer_ptr = cmd;
525 *pixel_start_ptr = pixel;
526 *device_address_ptr = dev_addr;
530 * There are 3 copies of every pixel: The front buffer that the fbdev
531 * client renders to, the actual framebuffer across the USB bus in hardware
532 * (that we can only write to, slowly, and can never read), and (optionally)
533 * our shadow copy that tracks what's been sent to that hardware buffer.
535 static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr,
536 const char *front, char **urb_buf_ptr,
537 u32 byte_offset, u32 byte_width,
538 int *ident_ptr, int *sent_ptr)
540 const u8 *line_start, *line_end, *next_pixel;
541 u32 dev_addr = dlfb->base16 + byte_offset;
542 struct urb *urb = *urb_ptr;
543 u8 *cmd = *urb_buf_ptr;
544 u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;
545 unsigned long back_buffer_offset = 0;
547 line_start = (u8 *) (front + byte_offset);
548 next_pixel = line_start;
549 line_end = next_pixel + byte_width;
551 if (dlfb->backing_buffer) {
553 const u8 *back_start = (u8 *) (dlfb->backing_buffer
556 back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start;
558 *ident_ptr += dlfb_trim_hline(back_start, &next_pixel,
561 offset = next_pixel - line_start;
562 line_end = next_pixel + byte_width;
564 back_start += offset;
565 line_start += offset;
568 while (next_pixel < line_end) {
570 dlfb_compress_hline((const uint16_t **) &next_pixel,
571 (const uint16_t *) line_end, &dev_addr,
572 (u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset,
575 if (cmd >= cmd_end) {
576 int len = cmd - (u8 *) urb->transfer_buffer;
577 if (dlfb_submit_urb(dlfb, urb, len))
578 return 1; /* lost pixels is set */
580 urb = dlfb_get_urb(dlfb);
582 return 1; /* lost_pixels is set */
584 cmd = urb->transfer_buffer;
585 cmd_end = &cmd[urb->transfer_buffer_length];
594 static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)
598 cycles_t start_cycles, end_cycles;
600 int bytes_identical = 0;
604 start_cycles = get_cycles();
606 mutex_lock(&dlfb->render_mutex);
608 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
609 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
613 (x + width > dlfb->info->var.xres) ||
614 (y + height > dlfb->info->var.yres)) {
619 if (!atomic_read(&dlfb->usb_active)) {
624 urb = dlfb_get_urb(dlfb);
629 cmd = urb->transfer_buffer;
631 for (i = y; i < y + height ; i++) {
632 const int line_offset = dlfb->info->fix.line_length * i;
633 const int byte_offset = line_offset + (x * BPP);
635 if (dlfb_render_hline(dlfb, &urb,
636 (char *) dlfb->info->fix.smem_start,
637 &cmd, byte_offset, width * BPP,
638 &bytes_identical, &bytes_sent))
642 if (cmd > (char *) urb->transfer_buffer) {
644 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
646 /* Send partial buffer remaining before exiting */
647 len = cmd - (char *) urb->transfer_buffer;
648 dlfb_submit_urb(dlfb, urb, len);
651 dlfb_urb_completion(urb);
654 atomic_add(bytes_sent, &dlfb->bytes_sent);
655 atomic_add(bytes_identical, &dlfb->bytes_identical);
656 atomic_add(width*height*2, &dlfb->bytes_rendered);
657 end_cycles = get_cycles();
658 atomic_add(((unsigned int) ((end_cycles - start_cycles)
659 >> 10)), /* Kcycles */
660 &dlfb->cpu_kcycles_used);
665 mutex_unlock(&dlfb->render_mutex);
669 static void dlfb_init_damage(struct dlfb_data *dlfb)
671 dlfb->damage_x = INT_MAX;
673 dlfb->damage_y = INT_MAX;
677 static void dlfb_damage_work(struct work_struct *w)
679 struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work);
682 spin_lock_irq(&dlfb->damage_lock);
684 x2 = dlfb->damage_x2;
686 y2 = dlfb->damage_y2;
687 dlfb_init_damage(dlfb);
688 spin_unlock_irq(&dlfb->damage_lock);
690 if (x < x2 && y < y2)
691 dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y);
694 static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)
700 if (x >= x2 || y >= y2)
703 spin_lock_irqsave(&dlfb->damage_lock, flags);
704 dlfb->damage_x = min(x, dlfb->damage_x);
705 dlfb->damage_x2 = max(x2, dlfb->damage_x2);
706 dlfb->damage_y = min(y, dlfb->damage_y);
707 dlfb->damage_y2 = max(y2, dlfb->damage_y2);
708 spin_unlock_irqrestore(&dlfb->damage_lock, flags);
710 schedule_work(&dlfb->damage_work);
714 * Path triggered by usermode clients who write to filesystem
715 * e.g. cat filename > /dev/fb1
716 * Not used by X Windows or text-mode console. But useful for testing.
717 * Slow because of extra copy and we must assume all pixels dirty.
719 static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf,
720 size_t count, loff_t *ppos)
723 struct dlfb_data *dlfb = info->par;
724 u32 offset = (u32) *ppos;
726 result = fb_sys_write(info, buf, count, ppos);
729 int start = max((int)(offset / info->fix.line_length), 0);
730 int lines = min((u32)((result / info->fix.line_length) + 1),
731 (u32)info->var.yres);
733 dlfb_handle_damage(dlfb, 0, start, info->var.xres,
740 /* hardware has native COPY command (see libdlo), but not worth it for fbcon */
741 static void dlfb_ops_copyarea(struct fb_info *info,
742 const struct fb_copyarea *area)
745 struct dlfb_data *dlfb = info->par;
747 sys_copyarea(info, area);
749 dlfb_offload_damage(dlfb, area->dx, area->dy,
750 area->width, area->height);
753 static void dlfb_ops_imageblit(struct fb_info *info,
754 const struct fb_image *image)
756 struct dlfb_data *dlfb = info->par;
758 sys_imageblit(info, image);
760 dlfb_offload_damage(dlfb, image->dx, image->dy,
761 image->width, image->height);
764 static void dlfb_ops_fillrect(struct fb_info *info,
765 const struct fb_fillrect *rect)
767 struct dlfb_data *dlfb = info->par;
769 sys_fillrect(info, rect);
771 dlfb_offload_damage(dlfb, rect->dx, rect->dy, rect->width,
776 * NOTE: fb_defio.c is holding info->fbdefio.mutex
777 * Touching ANY framebuffer memory that triggers a page fault
778 * in fb_defio will cause a deadlock, when it also tries to
779 * grab the same mutex.
781 static void dlfb_dpy_deferred_io(struct fb_info *info,
782 struct list_head *pagelist)
785 struct fb_deferred_io *fbdefio = info->fbdefio;
786 struct dlfb_data *dlfb = info->par;
789 cycles_t start_cycles, end_cycles;
791 int bytes_identical = 0;
792 int bytes_rendered = 0;
794 mutex_lock(&dlfb->render_mutex);
799 if (!atomic_read(&dlfb->usb_active))
802 start_cycles = get_cycles();
804 urb = dlfb_get_urb(dlfb);
808 cmd = urb->transfer_buffer;
810 /* walk the written page list and render each to device */
811 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
813 if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start,
814 &cmd, cur->index << PAGE_SHIFT,
815 PAGE_SIZE, &bytes_identical, &bytes_sent))
817 bytes_rendered += PAGE_SIZE;
820 if (cmd > (char *) urb->transfer_buffer) {
822 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
824 /* Send partial buffer remaining before exiting */
825 len = cmd - (char *) urb->transfer_buffer;
826 dlfb_submit_urb(dlfb, urb, len);
829 dlfb_urb_completion(urb);
832 atomic_add(bytes_sent, &dlfb->bytes_sent);
833 atomic_add(bytes_identical, &dlfb->bytes_identical);
834 atomic_add(bytes_rendered, &dlfb->bytes_rendered);
835 end_cycles = get_cycles();
836 atomic_add(((unsigned int) ((end_cycles - start_cycles)
837 >> 10)), /* Kcycles */
838 &dlfb->cpu_kcycles_used);
840 mutex_unlock(&dlfb->render_mutex);
843 static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len)
848 rbuf = kmalloc(2, GFP_KERNEL);
852 for (i = 0; i < len; i++) {
853 ret = usb_control_msg(dlfb->udev,
854 usb_rcvctrlpipe(dlfb->udev, 0), 0x02,
855 (0x80 | (0x02 << 5)), i << 8, 0xA1,
856 rbuf, 2, USB_CTRL_GET_TIMEOUT);
858 dev_err(&dlfb->udev->dev,
859 "Read EDID byte %d failed: %d\n", i, ret);
871 static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
875 struct dlfb_data *dlfb = info->par;
877 if (!atomic_read(&dlfb->usb_active))
880 /* TODO: Update X server to get this from sysfs instead */
881 if (cmd == DLFB_IOCTL_RETURN_EDID) {
882 void __user *edid = (void __user *)arg;
883 if (copy_to_user(edid, dlfb->edid, dlfb->edid_size))
888 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
889 if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {
892 if (copy_from_user(&area, (void __user *)arg,
893 sizeof(struct dloarea)))
897 * If we have a damage-aware client, turn fb_defio "off"
898 * To avoid perf imact of unnecessary page fault handling.
899 * Done by resetting the delay for this fb_info to a very
900 * long period. Pages will become writable and stay that way.
901 * Reset to normal value when all clients have closed this fb.
904 info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;
909 if (area.x > info->var.xres)
910 area.x = info->var.xres;
915 if (area.y > info->var.yres)
916 area.y = info->var.yres;
918 dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h);
924 /* taken from vesafb */
926 dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
927 unsigned blue, unsigned transp, struct fb_info *info)
931 if (regno >= info->cmap.len)
935 if (info->var.red.offset == 10) {
937 ((u32 *) (info->pseudo_palette))[regno] =
938 ((red & 0xf800) >> 1) |
939 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
942 ((u32 *) (info->pseudo_palette))[regno] =
944 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
952 * It's common for several clients to have framebuffer open simultaneously.
953 * e.g. both fbcon and X. Makes things interesting.
954 * Assumes caller is holding info->lock (for open and release at least)
956 static int dlfb_ops_open(struct fb_info *info, int user)
958 struct dlfb_data *dlfb = info->par;
961 * fbcon aggressively connects to first framebuffer it finds,
962 * preventing other clients (X) from working properly. Usually
963 * not what the user wants. Fail by default with option to enable.
965 if ((user == 0) && (!console))
968 /* If the USB device is gone, we don't accept new opens */
969 if (dlfb->virtualized)
974 if (fb_defio && (info->fbdefio == NULL)) {
975 /* enable defio at last moment if not disabled by client */
977 struct fb_deferred_io *fbdefio;
979 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
982 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
983 fbdefio->deferred_io = dlfb_dpy_deferred_io;
986 info->fbdefio = fbdefio;
987 fb_deferred_io_init(info);
990 dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n",
991 user, info, dlfb->fb_count);
996 static void dlfb_ops_destroy(struct fb_info *info)
998 struct dlfb_data *dlfb = info->par;
1000 cancel_work_sync(&dlfb->damage_work);
1002 mutex_destroy(&dlfb->render_mutex);
1004 if (info->cmap.len != 0)
1005 fb_dealloc_cmap(&info->cmap);
1006 if (info->monspecs.modedb)
1007 fb_destroy_modedb(info->monspecs.modedb);
1008 vfree(info->screen_base);
1010 fb_destroy_modelist(&info->modelist);
1012 while (!list_empty(&dlfb->deferred_free)) {
1013 struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list);
1018 vfree(dlfb->backing_buffer);
1020 dlfb_free_urb_list(dlfb);
1021 usb_put_dev(dlfb->udev);
1024 /* Assume info structure is freed after this point */
1025 framebuffer_release(info);
1029 * Assumes caller is holding info->lock mutex (for open and release at least)
1031 static int dlfb_ops_release(struct fb_info *info, int user)
1033 struct dlfb_data *dlfb = info->par;
1037 if ((dlfb->fb_count == 0) && (info->fbdefio)) {
1038 fb_deferred_io_cleanup(info);
1039 kfree(info->fbdefio);
1040 info->fbdefio = NULL;
1043 dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count);
1049 * Check whether a video mode is supported by the DisplayLink chip
1050 * We start from monitor's modes, so don't need to filter that here
1052 static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb)
1054 if (mode->xres * mode->yres > dlfb->sku_pixel_limit)
1060 static void dlfb_var_color_format(struct fb_var_screeninfo *var)
1062 const struct fb_bitfield red = { 11, 5, 0 };
1063 const struct fb_bitfield green = { 5, 6, 0 };
1064 const struct fb_bitfield blue = { 0, 5, 0 };
1066 var->bits_per_pixel = 16;
1072 static int dlfb_ops_check_var(struct fb_var_screeninfo *var,
1073 struct fb_info *info)
1075 struct fb_videomode mode;
1076 struct dlfb_data *dlfb = info->par;
1078 /* set device-specific elements of var unrelated to mode */
1079 dlfb_var_color_format(var);
1081 fb_var_to_videomode(&mode, var);
1083 if (!dlfb_is_valid_mode(&mode, dlfb))
1089 static int dlfb_ops_set_par(struct fb_info *info)
1091 struct dlfb_data *dlfb = info->par;
1093 u16 *pix_framebuffer;
1095 struct fb_var_screeninfo fvs;
1096 u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8);
1098 /* clear the activate field because it causes spurious miscompares */
1101 fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN;
1103 if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo)))
1106 result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length);
1110 result = dlfb_set_video_mode(dlfb, &info->var);
1115 dlfb->current_mode = fvs;
1116 info->fix.line_length = line_length;
1118 if (dlfb->fb_count == 0) {
1120 /* paint greenscreen */
1122 pix_framebuffer = (u16 *) info->screen_base;
1123 for (i = 0; i < info->fix.smem_len / 2; i++)
1124 pix_framebuffer[i] = 0x37e6;
1127 dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres);
1132 /* To fonzi the jukebox (e.g. make blanking changes take effect) */
1133 static char *dlfb_dummy_render(char *buf)
1136 *buf++ = 0x6A; /* copy */
1137 *buf++ = 0x00; /* from address*/
1140 *buf++ = 0x01; /* one pixel */
1141 *buf++ = 0x00; /* to address */
1148 * In order to come back from full DPMS off, we need to set the mode again
1150 static int dlfb_ops_blank(int blank_mode, struct fb_info *info)
1152 struct dlfb_data *dlfb = info->par;
1156 dev_dbg(info->dev, "blank, mode %d --> %d\n",
1157 dlfb->blank_mode, blank_mode);
1159 if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) &&
1160 (blank_mode != FB_BLANK_POWERDOWN)) {
1162 /* returning from powerdown requires a fresh modeset */
1163 dlfb_set_video_mode(dlfb, &info->var);
1166 urb = dlfb_get_urb(dlfb);
1170 bufptr = (char *) urb->transfer_buffer;
1171 bufptr = dlfb_vidreg_lock(bufptr);
1172 bufptr = dlfb_blanking(bufptr, blank_mode);
1173 bufptr = dlfb_vidreg_unlock(bufptr);
1175 /* seems like a render op is needed to have blank change take effect */
1176 bufptr = dlfb_dummy_render(bufptr);
1178 dlfb_submit_urb(dlfb, urb, bufptr -
1179 (char *) urb->transfer_buffer);
1181 dlfb->blank_mode = blank_mode;
1186 static const struct fb_ops dlfb_ops = {
1187 .owner = THIS_MODULE,
1188 .fb_read = fb_sys_read,
1189 .fb_write = dlfb_ops_write,
1190 .fb_setcolreg = dlfb_ops_setcolreg,
1191 .fb_fillrect = dlfb_ops_fillrect,
1192 .fb_copyarea = dlfb_ops_copyarea,
1193 .fb_imageblit = dlfb_ops_imageblit,
1194 .fb_mmap = dlfb_ops_mmap,
1195 .fb_ioctl = dlfb_ops_ioctl,
1196 .fb_open = dlfb_ops_open,
1197 .fb_release = dlfb_ops_release,
1198 .fb_blank = dlfb_ops_blank,
1199 .fb_check_var = dlfb_ops_check_var,
1200 .fb_set_par = dlfb_ops_set_par,
1201 .fb_destroy = dlfb_ops_destroy,
1205 static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem)
1207 struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL);
1211 list_add(&d->list, &dlfb->deferred_free);
1215 * Assumes &info->lock held by caller
1216 * Assumes no active clients have framebuffer open
1218 static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len)
1220 u32 old_len = info->fix.smem_len;
1221 const void *old_fb = (const void __force *)info->screen_base;
1222 unsigned char *new_fb;
1223 unsigned char *new_back = NULL;
1225 new_len = PAGE_ALIGN(new_len);
1227 if (new_len > old_len) {
1229 * Alloc system memory for virtual framebuffer
1231 new_fb = vmalloc(new_len);
1233 dev_err(info->dev, "Virtual framebuffer alloc failed\n");
1236 memset(new_fb, 0xff, new_len);
1238 if (info->screen_base) {
1239 memcpy(new_fb, old_fb, old_len);
1240 dlfb_deferred_vfree(dlfb, (void __force *)info->screen_base);
1243 info->screen_base = (char __iomem *)new_fb;
1244 info->fix.smem_len = new_len;
1245 info->fix.smem_start = (unsigned long) new_fb;
1246 info->flags = udlfb_info_flags;
1249 * Second framebuffer copy to mirror the framebuffer state
1250 * on the physical USB device. We can function without this.
1251 * But with imperfect damage info we may send pixels over USB
1252 * that were, in fact, unchanged - wasting limited USB bandwidth
1255 new_back = vzalloc(new_len);
1258 "No shadow/backing buffer allocated\n");
1260 dlfb_deferred_vfree(dlfb, dlfb->backing_buffer);
1261 dlfb->backing_buffer = new_back;
1268 * 1) Get EDID from hw, or use sw default
1269 * 2) Parse into various fb_info structs
1270 * 3) Allocate virtual framebuffer memory to back highest res mode
1272 * Parses EDID into three places used by various parts of fbdev:
1273 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1274 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1275 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1277 * If EDID is not readable/valid, then modelist is all VESA modes,
1278 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1279 * Returns 0 if successful
1281 static int dlfb_setup_modes(struct dlfb_data *dlfb,
1282 struct fb_info *info,
1283 char *default_edid, size_t default_edid_size)
1286 int i, result = 0, tries = 3;
1287 struct device *dev = info->device;
1288 struct fb_videomode *mode;
1289 const struct fb_videomode *default_vmode = NULL;
1292 /* only use mutex if info has been registered */
1293 mutex_lock(&info->lock);
1294 /* parent device is used otherwise */
1298 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1304 fb_destroy_modelist(&info->modelist);
1305 memset(&info->monspecs, 0, sizeof(info->monspecs));
1308 * Try to (re)read EDID from hardware first
1309 * EDID data may return, but not parse as valid
1310 * Try again a few times, in case of e.g. analog cable noise
1314 i = dlfb_get_edid(dlfb, edid, EDID_LENGTH);
1316 if (i >= EDID_LENGTH)
1317 fb_edid_to_monspecs(edid, &info->monspecs);
1319 if (info->monspecs.modedb_len > 0) {
1321 dlfb->edid_size = i;
1326 /* If that fails, use a previously returned EDID if available */
1327 if (info->monspecs.modedb_len == 0) {
1328 dev_err(dev, "Unable to get valid EDID from device/display\n");
1331 fb_edid_to_monspecs(dlfb->edid, &info->monspecs);
1332 if (info->monspecs.modedb_len > 0)
1333 dev_err(dev, "Using previously queried EDID\n");
1337 /* If that fails, use the default EDID we were handed */
1338 if (info->monspecs.modedb_len == 0) {
1339 if (default_edid_size >= EDID_LENGTH) {
1340 fb_edid_to_monspecs(default_edid, &info->monspecs);
1341 if (info->monspecs.modedb_len > 0) {
1342 memcpy(edid, default_edid, default_edid_size);
1344 dlfb->edid_size = default_edid_size;
1345 dev_err(dev, "Using default/backup EDID\n");
1350 /* If we've got modes, let's pick a best default mode */
1351 if (info->monspecs.modedb_len > 0) {
1353 for (i = 0; i < info->monspecs.modedb_len; i++) {
1354 mode = &info->monspecs.modedb[i];
1355 if (dlfb_is_valid_mode(mode, dlfb)) {
1356 fb_add_videomode(mode, &info->modelist);
1358 dev_dbg(dev, "Specified mode %dx%d too big\n",
1359 mode->xres, mode->yres);
1361 /* if we've removed top/best mode */
1363 &= ~FB_MISC_1ST_DETAIL;
1367 default_vmode = fb_find_best_display(&info->monspecs,
1371 /* If everything else has failed, fall back to safe default mode */
1372 if (default_vmode == NULL) {
1374 struct fb_videomode fb_vmode = {0};
1377 * Add the standard VESA modes to our modelist
1378 * Since we don't have EDID, there may be modes that
1379 * overspec monitor and/or are incorrect aspect ratio, etc.
1380 * But at least the user has a chance to choose
1382 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1383 mode = (struct fb_videomode *)&vesa_modes[i];
1384 if (dlfb_is_valid_mode(mode, dlfb))
1385 fb_add_videomode(mode, &info->modelist);
1387 dev_dbg(dev, "VESA mode %dx%d too big\n",
1388 mode->xres, mode->yres);
1392 * default to resolution safe for projectors
1393 * (since they are most common case without EDID)
1395 fb_vmode.xres = 800;
1396 fb_vmode.yres = 600;
1397 fb_vmode.refresh = 60;
1398 default_vmode = fb_find_nearest_mode(&fb_vmode,
1402 /* If we have good mode and no active clients*/
1403 if ((default_vmode != NULL) && (dlfb->fb_count == 0)) {
1405 fb_videomode_to_var(&info->var, default_vmode);
1406 dlfb_var_color_format(&info->var);
1409 * with mode size info, we can now alloc our framebuffer.
1411 memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix));
1416 if (edid && (dlfb->edid != edid))
1420 mutex_unlock(&info->lock);
1425 static ssize_t metrics_bytes_rendered_show(struct device *fbdev,
1426 struct device_attribute *a, char *buf) {
1427 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1428 struct dlfb_data *dlfb = fb_info->par;
1429 return snprintf(buf, PAGE_SIZE, "%u\n",
1430 atomic_read(&dlfb->bytes_rendered));
1433 static ssize_t metrics_bytes_identical_show(struct device *fbdev,
1434 struct device_attribute *a, char *buf) {
1435 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1436 struct dlfb_data *dlfb = fb_info->par;
1437 return snprintf(buf, PAGE_SIZE, "%u\n",
1438 atomic_read(&dlfb->bytes_identical));
1441 static ssize_t metrics_bytes_sent_show(struct device *fbdev,
1442 struct device_attribute *a, char *buf) {
1443 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1444 struct dlfb_data *dlfb = fb_info->par;
1445 return snprintf(buf, PAGE_SIZE, "%u\n",
1446 atomic_read(&dlfb->bytes_sent));
1449 static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev,
1450 struct device_attribute *a, char *buf) {
1451 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1452 struct dlfb_data *dlfb = fb_info->par;
1453 return snprintf(buf, PAGE_SIZE, "%u\n",
1454 atomic_read(&dlfb->cpu_kcycles_used));
1457 static ssize_t edid_show(
1459 struct kobject *kobj, struct bin_attribute *a,
1460 char *buf, loff_t off, size_t count) {
1461 struct device *fbdev = kobj_to_dev(kobj);
1462 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1463 struct dlfb_data *dlfb = fb_info->par;
1465 if (dlfb->edid == NULL)
1468 if ((off >= dlfb->edid_size) || (count > dlfb->edid_size))
1471 if (off + count > dlfb->edid_size)
1472 count = dlfb->edid_size - off;
1474 memcpy(buf, dlfb->edid, count);
1479 static ssize_t edid_store(
1481 struct kobject *kobj, struct bin_attribute *a,
1482 char *src, loff_t src_off, size_t src_size) {
1483 struct device *fbdev = kobj_to_dev(kobj);
1484 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1485 struct dlfb_data *dlfb = fb_info->par;
1488 /* We only support write of entire EDID at once, no offset*/
1489 if ((src_size != EDID_LENGTH) || (src_off != 0))
1492 ret = dlfb_setup_modes(dlfb, fb_info, src, src_size);
1496 if (!dlfb->edid || memcmp(src, dlfb->edid, src_size))
1499 ret = dlfb_ops_set_par(fb_info);
1506 static ssize_t metrics_reset_store(struct device *fbdev,
1507 struct device_attribute *attr,
1508 const char *buf, size_t count)
1510 struct fb_info *fb_info = dev_get_drvdata(fbdev);
1511 struct dlfb_data *dlfb = fb_info->par;
1513 atomic_set(&dlfb->bytes_rendered, 0);
1514 atomic_set(&dlfb->bytes_identical, 0);
1515 atomic_set(&dlfb->bytes_sent, 0);
1516 atomic_set(&dlfb->cpu_kcycles_used, 0);
1521 static const struct bin_attribute edid_attr = {
1522 .attr.name = "edid",
1524 .size = EDID_LENGTH,
1529 static const struct device_attribute fb_device_attrs[] = {
1530 __ATTR_RO(metrics_bytes_rendered),
1531 __ATTR_RO(metrics_bytes_identical),
1532 __ATTR_RO(metrics_bytes_sent),
1533 __ATTR_RO(metrics_cpu_kcycles_used),
1534 __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store),
1538 * This is necessary before we can communicate with the display controller.
1540 static int dlfb_select_std_channel(struct dlfb_data *dlfb)
1544 static const u8 set_def_chn[] = {
1545 0x57, 0xCD, 0xDC, 0xA7,
1546 0x1C, 0x88, 0x5E, 0x15,
1547 0x60, 0xFE, 0xC6, 0x97,
1548 0x16, 0x3D, 0x47, 0xF2 };
1550 buf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
1555 ret = usb_control_msg(dlfb->udev, usb_sndctrlpipe(dlfb->udev, 0),
1556 NR_USB_REQUEST_CHANNEL,
1557 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
1558 buf, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT);
1565 static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb,
1566 struct usb_interface *intf)
1573 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
1578 total_len = usb_get_descriptor(interface_to_usbdev(intf),
1579 0x5f, /* vendor specific */
1580 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
1582 /* if not found, look in configuration descriptor */
1583 if (total_len < 0) {
1584 if (0 == usb_get_extra_descriptor(intf->cur_altsetting,
1586 total_len = (int) desc[0];
1589 if (total_len > 5) {
1590 dev_info(&intf->dev,
1591 "vendor descriptor length: %d data: %11ph\n",
1594 if ((desc[0] != total_len) || /* descriptor length */
1595 (desc[1] != 0x5f) || /* vendor descriptor type */
1596 (desc[2] != 0x01) || /* version (2 bytes) */
1597 (desc[3] != 0x00) ||
1598 (desc[4] != total_len - 2)) /* length after type */
1601 desc_end = desc + total_len;
1602 desc += 5; /* the fixed header we've already parsed */
1604 while (desc < desc_end) {
1609 key |= (u16)*desc++ << 8;
1613 case 0x0200: { /* max_area */
1614 u32 max_area = *desc++;
1615 max_area |= (u32)*desc++ << 8;
1616 max_area |= (u32)*desc++ << 16;
1617 max_area |= (u32)*desc++ << 24;
1618 dev_warn(&intf->dev,
1619 "DL chip limited to %d pixel modes\n",
1621 dlfb->sku_pixel_limit = max_area;
1630 dev_info(&intf->dev, "vendor descriptor not available (%d)\n",
1637 /* allow udlfb to load for now even if firmware unrecognized */
1638 dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n");
1645 static int dlfb_usb_probe(struct usb_interface *intf,
1646 const struct usb_device_id *id)
1649 const struct device_attribute *attr;
1650 struct dlfb_data *dlfb;
1651 struct fb_info *info;
1652 int retval = -ENOMEM;
1653 struct usb_device *usbdev = interface_to_usbdev(intf);
1655 /* usb initialization */
1656 dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL);
1658 dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__);
1662 INIT_LIST_HEAD(&dlfb->deferred_free);
1664 dlfb->udev = usb_get_dev(usbdev);
1665 usb_set_intfdata(intf, dlfb);
1667 dev_dbg(&intf->dev, "console enable=%d\n", console);
1668 dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio);
1669 dev_dbg(&intf->dev, "shadow enable=%d\n", shadow);
1671 dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */
1673 if (!dlfb_parse_vendor_descriptor(dlfb, intf)) {
1675 "firmware not recognized, incompatible device?\n");
1680 dev_warn(&intf->dev,
1681 "DL chip limit of %d overridden to %d\n",
1682 dlfb->sku_pixel_limit, pixel_limit);
1683 dlfb->sku_pixel_limit = pixel_limit;
1687 /* allocates framebuffer driver structure, not framebuffer memory */
1688 info = framebuffer_alloc(0, &dlfb->udev->dev);
1694 info->pseudo_palette = dlfb->pseudo_palette;
1695 dlfb->ops = dlfb_ops;
1696 info->fbops = &dlfb->ops;
1698 mutex_init(&dlfb->render_mutex);
1699 dlfb_init_damage(dlfb);
1700 spin_lock_init(&dlfb->damage_lock);
1701 INIT_WORK(&dlfb->damage_work, dlfb_damage_work);
1703 INIT_LIST_HEAD(&info->modelist);
1705 if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1707 dev_err(&intf->dev, "unable to allocate urb list\n");
1711 /* We don't register a new USB class. Our client interface is dlfbev */
1713 retval = fb_alloc_cmap(&info->cmap, 256, 0);
1715 dev_err(info->device, "cmap allocation failed: %d\n", retval);
1719 retval = dlfb_setup_modes(dlfb, info, NULL, 0);
1721 dev_err(info->device,
1722 "unable to find common mode for display and adapter\n");
1726 /* ready to begin using device */
1728 atomic_set(&dlfb->usb_active, 1);
1729 dlfb_select_std_channel(dlfb);
1731 dlfb_ops_check_var(&info->var, info);
1732 retval = dlfb_ops_set_par(info);
1736 retval = register_framebuffer(info);
1738 dev_err(info->device, "unable to register framebuffer: %d\n",
1743 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {
1744 attr = &fb_device_attrs[i];
1745 retval = device_create_file(info->dev, attr);
1747 dev_warn(info->device,
1748 "failed to create '%s' attribute: %d\n",
1749 attr->attr.name, retval);
1752 retval = device_create_bin_file(info->dev, &edid_attr);
1754 dev_warn(info->device, "failed to create '%s' attribute: %d\n",
1755 edid_attr.attr.name, retval);
1757 dev_info(info->device,
1758 "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n",
1759 dev_name(info->dev), info->var.xres, info->var.yres,
1760 ((dlfb->backing_buffer) ?
1761 info->fix.smem_len * 2 : info->fix.smem_len) >> 10);
1766 dlfb_ops_destroy(dlfb->info);
1768 usb_put_dev(dlfb->udev);
1774 static void dlfb_usb_disconnect(struct usb_interface *intf)
1776 struct dlfb_data *dlfb;
1777 struct fb_info *info;
1780 dlfb = usb_get_intfdata(intf);
1783 dev_dbg(&intf->dev, "USB disconnect starting\n");
1785 /* we virtualize until all fb clients release. Then we free */
1786 dlfb->virtualized = true;
1788 /* When non-active we'll update virtual framebuffer, but no new urbs */
1789 atomic_set(&dlfb->usb_active, 0);
1791 /* this function will wait for all in-flight urbs to complete */
1792 dlfb_free_urb_list(dlfb);
1794 /* remove udlfb's sysfs interfaces */
1795 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
1796 device_remove_file(info->dev, &fb_device_attrs[i]);
1797 device_remove_bin_file(info->dev, &edid_attr);
1799 unregister_framebuffer(info);
1802 static struct usb_driver dlfb_driver = {
1804 .probe = dlfb_usb_probe,
1805 .disconnect = dlfb_usb_disconnect,
1806 .id_table = id_table,
1809 module_usb_driver(dlfb_driver);
1811 static void dlfb_urb_completion(struct urb *urb)
1813 struct urb_node *unode = urb->context;
1814 struct dlfb_data *dlfb = unode->dlfb;
1815 unsigned long flags;
1817 switch (urb->status) {
1824 /* sync/async unlink faults aren't errors */
1827 dev_err(&dlfb->udev->dev,
1828 "%s - nonzero write bulk status received: %d\n",
1829 __func__, urb->status);
1830 atomic_set(&dlfb->lost_pixels, 1);
1834 urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */
1836 spin_lock_irqsave(&dlfb->urbs.lock, flags);
1837 list_add_tail(&unode->entry, &dlfb->urbs.list);
1838 dlfb->urbs.available++;
1839 spin_unlock_irqrestore(&dlfb->urbs.lock, flags);
1841 up(&dlfb->urbs.limit_sem);
1844 static void dlfb_free_urb_list(struct dlfb_data *dlfb)
1846 int count = dlfb->urbs.count;
1847 struct list_head *node;
1848 struct urb_node *unode;
1851 /* keep waiting and freeing, until we've got 'em all */
1853 down(&dlfb->urbs.limit_sem);
1855 spin_lock_irq(&dlfb->urbs.lock);
1857 node = dlfb->urbs.list.next; /* have reserved one with sem */
1858 list_del_init(node);
1860 spin_unlock_irq(&dlfb->urbs.lock);
1862 unode = list_entry(node, struct urb_node, entry);
1865 /* Free each separately allocated piece */
1866 usb_free_coherent(urb->dev, dlfb->urbs.size,
1867 urb->transfer_buffer, urb->transfer_dma);
1872 dlfb->urbs.count = 0;
1875 static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size)
1878 struct urb_node *unode;
1880 size_t wanted_size = count * size;
1882 spin_lock_init(&dlfb->urbs.lock);
1885 dlfb->urbs.size = size;
1886 INIT_LIST_HEAD(&dlfb->urbs.list);
1888 sema_init(&dlfb->urbs.limit_sem, 0);
1889 dlfb->urbs.count = 0;
1890 dlfb->urbs.available = 0;
1892 while (dlfb->urbs.count * size < wanted_size) {
1893 unode = kzalloc(sizeof(*unode), GFP_KERNEL);
1898 urb = usb_alloc_urb(0, GFP_KERNEL);
1905 buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL,
1906 &urb->transfer_dma);
1910 if (size > PAGE_SIZE) {
1912 dlfb_free_urb_list(dlfb);
1918 /* urb->transfer_buffer_length set to actual before submit */
1919 usb_fill_bulk_urb(urb, dlfb->udev, usb_sndbulkpipe(dlfb->udev, 1),
1920 buf, size, dlfb_urb_completion, unode);
1921 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1923 list_add_tail(&unode->entry, &dlfb->urbs.list);
1925 up(&dlfb->urbs.limit_sem);
1927 dlfb->urbs.available++;
1930 return dlfb->urbs.count;
1933 static struct urb *dlfb_get_urb(struct dlfb_data *dlfb)
1936 struct list_head *entry;
1937 struct urb_node *unode;
1939 /* Wait for an in-flight buffer to complete and get re-queued */
1940 ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT);
1942 atomic_set(&dlfb->lost_pixels, 1);
1943 dev_warn(&dlfb->udev->dev,
1944 "wait for urb interrupted: %d available: %d\n",
1945 ret, dlfb->urbs.available);
1949 spin_lock_irq(&dlfb->urbs.lock);
1951 BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */
1952 entry = dlfb->urbs.list.next;
1953 list_del_init(entry);
1954 dlfb->urbs.available--;
1956 spin_unlock_irq(&dlfb->urbs.lock);
1958 unode = list_entry(entry, struct urb_node, entry);
1962 static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len)
1966 BUG_ON(len > dlfb->urbs.size);
1968 urb->transfer_buffer_length = len; /* set to actual payload len */
1969 ret = usb_submit_urb(urb, GFP_KERNEL);
1971 dlfb_urb_completion(urb); /* because no one else will */
1972 atomic_set(&dlfb->lost_pixels, 1);
1973 dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret);
1978 module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1979 MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer");
1981 module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1982 MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes");
1984 module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1985 MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf");
1987 module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1988 MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)");
1990 MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, "
1991 "Jaya Kumar <jayakumar.lkml@gmail.com>, "
1992 "Bernie Thompson <bernie@plugable.com>");
1993 MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver");
1994 MODULE_LICENSE("GPL");