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1995 lines
51 KiB
1995 lines
51 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* udlfb.c -- Framebuffer driver for DisplayLink USB controller |
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* |
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* Copyright (C) 2009 Roberto De Ioris <[email protected]> |
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* Copyright (C) 2009 Jaya Kumar <[email protected]> |
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* Copyright (C) 2009 Bernie Thompson <[email protected]> |
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* |
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* Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, |
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* usb-skeleton by GregKH. |
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* |
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* Device-specific portions based on information from Displaylink, with work |
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* from Florian Echtler, Henrik Bjerregaard Pedersen, and others. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/usb.h> |
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#include <linux/uaccess.h> |
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#include <linux/mm.h> |
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#include <linux/fb.h> |
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#include <linux/vmalloc.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <asm/unaligned.h> |
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#include <video/udlfb.h> |
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#include "edid.h" |
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static const struct fb_fix_screeninfo dlfb_fix = { |
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.id = "udlfb", |
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.type = FB_TYPE_PACKED_PIXELS, |
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.visual = FB_VISUAL_TRUECOLOR, |
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.xpanstep = 0, |
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.ypanstep = 0, |
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.ywrapstep = 0, |
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.accel = FB_ACCEL_NONE, |
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}; |
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static const u32 udlfb_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST | |
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FBINFO_VIRTFB | |
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FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | |
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FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; |
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|
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/* |
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* There are many DisplayLink-based graphics products, all with unique PIDs. |
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* So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) |
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* We also require a match on SubClass (0x00) and Protocol (0x00), |
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* which is compatible with all known USB 2.0 era graphics chips and firmware, |
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* but allows DisplayLink to increment those for any future incompatible chips |
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*/ |
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static const struct usb_device_id id_table[] = { |
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{.idVendor = 0x17e9, |
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.bInterfaceClass = 0xff, |
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.bInterfaceSubClass = 0x00, |
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.bInterfaceProtocol = 0x00, |
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.match_flags = USB_DEVICE_ID_MATCH_VENDOR | |
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USB_DEVICE_ID_MATCH_INT_CLASS | |
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USB_DEVICE_ID_MATCH_INT_SUBCLASS | |
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USB_DEVICE_ID_MATCH_INT_PROTOCOL, |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(usb, id_table); |
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|
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/* module options */ |
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static bool console = true; /* Allow fbcon to open framebuffer */ |
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static bool fb_defio = true; /* Detect mmap writes using page faults */ |
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static bool shadow = true; /* Optionally disable shadow framebuffer */ |
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static int pixel_limit; /* Optionally force a pixel resolution limit */ |
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struct dlfb_deferred_free { |
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struct list_head list; |
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void *mem; |
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}; |
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static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len); |
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/* dlfb keeps a list of urbs for efficient bulk transfers */ |
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static void dlfb_urb_completion(struct urb *urb); |
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static struct urb *dlfb_get_urb(struct dlfb_data *dlfb); |
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static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len); |
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static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size); |
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static void dlfb_free_urb_list(struct dlfb_data *dlfb); |
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/* |
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* All DisplayLink bulk operations start with 0xAF, followed by specific code |
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* All operations are written to buffers which then later get sent to device |
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*/ |
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static char *dlfb_set_register(char *buf, u8 reg, u8 val) |
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{ |
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*buf++ = 0xAF; |
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*buf++ = 0x20; |
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*buf++ = reg; |
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*buf++ = val; |
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return buf; |
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} |
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static char *dlfb_vidreg_lock(char *buf) |
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{ |
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return dlfb_set_register(buf, 0xFF, 0x00); |
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} |
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static char *dlfb_vidreg_unlock(char *buf) |
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{ |
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return dlfb_set_register(buf, 0xFF, 0xFF); |
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} |
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/* |
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* Map FB_BLANK_* to DisplayLink register |
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* DLReg FB_BLANK_* |
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* ----- ----------------------------- |
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* 0x00 FB_BLANK_UNBLANK (0) |
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* 0x01 FB_BLANK (1) |
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* 0x03 FB_BLANK_VSYNC_SUSPEND (2) |
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* 0x05 FB_BLANK_HSYNC_SUSPEND (3) |
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* 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back |
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*/ |
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static char *dlfb_blanking(char *buf, int fb_blank) |
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{ |
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u8 reg; |
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switch (fb_blank) { |
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case FB_BLANK_POWERDOWN: |
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reg = 0x07; |
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break; |
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case FB_BLANK_HSYNC_SUSPEND: |
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reg = 0x05; |
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break; |
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case FB_BLANK_VSYNC_SUSPEND: |
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reg = 0x03; |
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break; |
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case FB_BLANK_NORMAL: |
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reg = 0x01; |
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break; |
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default: |
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reg = 0x00; |
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} |
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buf = dlfb_set_register(buf, 0x1F, reg); |
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return buf; |
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} |
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static char *dlfb_set_color_depth(char *buf, u8 selection) |
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{ |
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return dlfb_set_register(buf, 0x00, selection); |
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} |
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static char *dlfb_set_base16bpp(char *wrptr, u32 base) |
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{ |
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/* the base pointer is 16 bits wide, 0x20 is hi byte. */ |
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wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); |
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wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); |
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return dlfb_set_register(wrptr, 0x22, base); |
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} |
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/* |
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* DisplayLink HW has separate 16bpp and 8bpp framebuffers. |
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* In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer |
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*/ |
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static char *dlfb_set_base8bpp(char *wrptr, u32 base) |
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{ |
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wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); |
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wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); |
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return dlfb_set_register(wrptr, 0x28, base); |
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} |
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static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) |
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{ |
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wrptr = dlfb_set_register(wrptr, reg, value >> 8); |
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return dlfb_set_register(wrptr, reg+1, value); |
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} |
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/* |
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* This is kind of weird because the controller takes some |
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* register values in a different byte order than other registers. |
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*/ |
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static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) |
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{ |
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wrptr = dlfb_set_register(wrptr, reg, value); |
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return dlfb_set_register(wrptr, reg+1, value >> 8); |
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} |
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/* |
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* LFSR is linear feedback shift register. The reason we have this is |
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* because the display controller needs to minimize the clock depth of |
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* various counters used in the display path. So this code reverses the |
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* provided value into the lfsr16 value by counting backwards to get |
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* the value that needs to be set in the hardware comparator to get the |
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* same actual count. This makes sense once you read above a couple of |
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* times and think about it from a hardware perspective. |
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*/ |
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static u16 dlfb_lfsr16(u16 actual_count) |
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{ |
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u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ |
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while (actual_count--) { |
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lv = ((lv << 1) | |
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(((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) |
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& 0xFFFF; |
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} |
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return (u16) lv; |
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} |
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/* |
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* This does LFSR conversion on the value that is to be written. |
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* See LFSR explanation above for more detail. |
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*/ |
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static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) |
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{ |
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return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); |
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} |
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/* |
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* This takes a standard fbdev screeninfo struct and all of its monitor mode |
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* details and converts them into the DisplayLink equivalent register commands. |
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*/ |
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static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) |
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{ |
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u16 xds, yds; |
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u16 xde, yde; |
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u16 yec; |
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/* x display start */ |
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xds = var->left_margin + var->hsync_len; |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); |
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/* x display end */ |
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xde = xds + var->xres; |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); |
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/* y display start */ |
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yds = var->upper_margin + var->vsync_len; |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); |
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/* y display end */ |
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yde = yds + var->yres; |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); |
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/* x end count is active + blanking - 1 */ |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, |
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xde + var->right_margin - 1); |
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/* libdlo hardcodes hsync start to 1 */ |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); |
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/* hsync end is width of sync pulse + 1 */ |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); |
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/* hpixels is active pixels */ |
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wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); |
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/* yendcount is vertical active + vertical blanking */ |
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yec = var->yres + var->upper_margin + var->lower_margin + |
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var->vsync_len; |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); |
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/* libdlo hardcodes vsync start to 0 */ |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); |
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/* vsync end is width of vsync pulse */ |
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wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); |
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/* vpixels is active pixels */ |
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wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); |
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/* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ |
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wrptr = dlfb_set_register_16be(wrptr, 0x1B, |
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200*1000*1000/var->pixclock); |
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return wrptr; |
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} |
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/* |
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* This takes a standard fbdev screeninfo struct that was fetched or prepared |
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* and then generates the appropriate command sequence that then drives the |
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* display controller. |
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*/ |
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static int dlfb_set_video_mode(struct dlfb_data *dlfb, |
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struct fb_var_screeninfo *var) |
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{ |
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char *buf; |
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char *wrptr; |
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int retval; |
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int writesize; |
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struct urb *urb; |
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if (!atomic_read(&dlfb->usb_active)) |
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return -EPERM; |
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urb = dlfb_get_urb(dlfb); |
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if (!urb) |
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return -ENOMEM; |
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buf = (char *) urb->transfer_buffer; |
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/* |
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* This first section has to do with setting the base address on the |
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* controller * associated with the display. There are 2 base |
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* pointers, currently, we only * use the 16 bpp segment. |
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*/ |
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wrptr = dlfb_vidreg_lock(buf); |
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wrptr = dlfb_set_color_depth(wrptr, 0x00); |
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/* set base for 16bpp segment to 0 */ |
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wrptr = dlfb_set_base16bpp(wrptr, 0); |
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/* set base for 8bpp segment to end of fb */ |
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wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len); |
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wrptr = dlfb_set_vid_cmds(wrptr, var); |
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wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); |
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wrptr = dlfb_vidreg_unlock(wrptr); |
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writesize = wrptr - buf; |
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retval = dlfb_submit_urb(dlfb, urb, writesize); |
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dlfb->blank_mode = FB_BLANK_UNBLANK; |
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return retval; |
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} |
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static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) |
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{ |
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unsigned long start = vma->vm_start; |
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unsigned long size = vma->vm_end - vma->vm_start; |
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
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unsigned long page, pos; |
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if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) |
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return -EINVAL; |
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if (size > info->fix.smem_len) |
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return -EINVAL; |
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if (offset > info->fix.smem_len - size) |
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return -EINVAL; |
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pos = (unsigned long)info->fix.smem_start + offset; |
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dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n", |
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pos, size); |
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while (size > 0) { |
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page = vmalloc_to_pfn((void *)pos); |
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if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) |
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return -EAGAIN; |
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start += PAGE_SIZE; |
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pos += PAGE_SIZE; |
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if (size > PAGE_SIZE) |
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size -= PAGE_SIZE; |
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else |
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size = 0; |
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} |
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return 0; |
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} |
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/* |
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* Trims identical data from front and back of line |
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* Sets new front buffer address and width |
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* And returns byte count of identical pixels |
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* Assumes CPU natural alignment (unsigned long) |
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* for back and front buffer ptrs and width |
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*/ |
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static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) |
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{ |
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int j, k; |
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const unsigned long *back = (const unsigned long *) bback; |
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const unsigned long *front = (const unsigned long *) *bfront; |
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const int width = *width_bytes / sizeof(unsigned long); |
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int identical = width; |
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int start = width; |
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int end = width; |
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for (j = 0; j < width; j++) { |
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if (back[j] != front[j]) { |
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start = j; |
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break; |
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} |
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} |
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for (k = width - 1; k > j; k--) { |
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if (back[k] != front[k]) { |
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end = k+1; |
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break; |
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} |
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} |
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identical = start + (width - end); |
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*bfront = (u8 *) &front[start]; |
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*width_bytes = (end - start) * sizeof(unsigned long); |
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return identical * sizeof(unsigned long); |
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} |
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/* |
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* Render a command stream for an encoded horizontal line segment of pixels. |
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* |
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* A command buffer holds several commands. |
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* It always begins with a fresh command header |
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* (the protocol doesn't require this, but we enforce it to allow |
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* multiple buffers to be potentially encoded and sent in parallel). |
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* A single command encodes one contiguous horizontal line of pixels |
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* |
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* The function relies on the client to do all allocation, so that |
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* rendering can be done directly to output buffers (e.g. USB URBs). |
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* The function fills the supplied command buffer, providing information |
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* on where it left off, so the client may call in again with additional |
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* buffers if the line will take several buffers to complete. |
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* |
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* A single command can transmit a maximum of 256 pixels, |
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* regardless of the compression ratio (protocol design limit). |
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* To the hardware, 0 for a size byte means 256 |
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* |
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* Rather than 256 pixel commands which are either rl or raw encoded, |
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* the rlx command simply assumes alternating raw and rl spans within one cmd. |
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* This has a slightly larger header overhead, but produces more even results. |
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* It also processes all data (read and write) in a single pass. |
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* Performance benchmarks of common cases show it having just slightly better |
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* compression than 256 pixel raw or rle commands, with similar CPU consumpion. |
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* But for very rl friendly data, will compress not quite as well. |
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*/ |
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static void dlfb_compress_hline( |
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const uint16_t **pixel_start_ptr, |
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const uint16_t *const pixel_end, |
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uint32_t *device_address_ptr, |
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uint8_t **command_buffer_ptr, |
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const uint8_t *const cmd_buffer_end, |
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unsigned long back_buffer_offset, |
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int *ident_ptr) |
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{ |
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const uint16_t *pixel = *pixel_start_ptr; |
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uint32_t dev_addr = *device_address_ptr; |
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uint8_t *cmd = *command_buffer_ptr; |
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while ((pixel_end > pixel) && |
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(cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { |
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uint8_t *raw_pixels_count_byte = NULL; |
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uint8_t *cmd_pixels_count_byte = NULL; |
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const uint16_t *raw_pixel_start = NULL; |
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const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; |
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|
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if (back_buffer_offset && |
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*pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) { |
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pixel++; |
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dev_addr += BPP; |
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(*ident_ptr)++; |
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continue; |
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} |
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*cmd++ = 0xAF; |
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*cmd++ = 0x6B; |
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*cmd++ = dev_addr >> 16; |
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*cmd++ = dev_addr >> 8; |
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*cmd++ = dev_addr; |
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cmd_pixels_count_byte = cmd++; /* we'll know this later */ |
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cmd_pixel_start = pixel; |
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raw_pixels_count_byte = cmd++; /* we'll know this later */ |
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raw_pixel_start = pixel; |
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cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL, |
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(unsigned long)(pixel_end - pixel), |
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(unsigned long)(cmd_buffer_end - 1 - cmd) / BPP); |
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|
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if (back_buffer_offset) { |
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/* note: the framebuffer may change under us, so we must test for underflow */ |
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while (cmd_pixel_end - 1 > pixel && |
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*(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset)) |
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cmd_pixel_end--; |
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} |
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|
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while (pixel < cmd_pixel_end) { |
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const uint16_t * const repeating_pixel = pixel; |
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u16 pixel_value = *pixel; |
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|
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put_unaligned_be16(pixel_value, cmd); |
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if (back_buffer_offset) |
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*(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; |
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cmd += 2; |
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pixel++; |
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|
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if (unlikely((pixel < cmd_pixel_end) && |
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(*pixel == pixel_value))) { |
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/* go back and fill in raw pixel count */ |
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*raw_pixels_count_byte = ((repeating_pixel - |
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raw_pixel_start) + 1) & 0xFF; |
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|
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do { |
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if (back_buffer_offset) |
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*(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; |
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pixel++; |
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} while ((pixel < cmd_pixel_end) && |
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(*pixel == pixel_value)); |
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|
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/* immediately after raw data is repeat byte */ |
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*cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; |
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|
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/* Then start another raw pixel span */ |
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raw_pixel_start = pixel; |
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raw_pixels_count_byte = cmd++; |
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} |
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} |
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if (pixel > raw_pixel_start) { |
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/* finalize last RAW span */ |
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*raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; |
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} else { |
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/* undo unused byte */ |
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cmd--; |
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} |
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*cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; |
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dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start; |
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} |
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if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) { |
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/* Fill leftover bytes with no-ops */ |
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if (cmd_buffer_end > cmd) |
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memset(cmd, 0xAF, cmd_buffer_end - cmd); |
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cmd = (uint8_t *) cmd_buffer_end; |
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} |
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*command_buffer_ptr = cmd; |
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*pixel_start_ptr = pixel; |
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*device_address_ptr = dev_addr; |
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} |
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|
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/* |
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* There are 3 copies of every pixel: The front buffer that the fbdev |
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* client renders to, the actual framebuffer across the USB bus in hardware |
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* (that we can only write to, slowly, and can never read), and (optionally) |
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* our shadow copy that tracks what's been sent to that hardware buffer. |
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*/ |
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static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr, |
|
const char *front, char **urb_buf_ptr, |
|
u32 byte_offset, u32 byte_width, |
|
int *ident_ptr, int *sent_ptr) |
|
{ |
|
const u8 *line_start, *line_end, *next_pixel; |
|
u32 dev_addr = dlfb->base16 + byte_offset; |
|
struct urb *urb = *urb_ptr; |
|
u8 *cmd = *urb_buf_ptr; |
|
u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; |
|
unsigned long back_buffer_offset = 0; |
|
|
|
line_start = (u8 *) (front + byte_offset); |
|
next_pixel = line_start; |
|
line_end = next_pixel + byte_width; |
|
|
|
if (dlfb->backing_buffer) { |
|
int offset; |
|
const u8 *back_start = (u8 *) (dlfb->backing_buffer |
|
+ byte_offset); |
|
|
|
back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start; |
|
|
|
*ident_ptr += dlfb_trim_hline(back_start, &next_pixel, |
|
&byte_width); |
|
|
|
offset = next_pixel - line_start; |
|
line_end = next_pixel + byte_width; |
|
dev_addr += offset; |
|
back_start += offset; |
|
line_start += offset; |
|
} |
|
|
|
while (next_pixel < line_end) { |
|
|
|
dlfb_compress_hline((const uint16_t **) &next_pixel, |
|
(const uint16_t *) line_end, &dev_addr, |
|
(u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset, |
|
ident_ptr); |
|
|
|
if (cmd >= cmd_end) { |
|
int len = cmd - (u8 *) urb->transfer_buffer; |
|
if (dlfb_submit_urb(dlfb, urb, len)) |
|
return 1; /* lost pixels is set */ |
|
*sent_ptr += len; |
|
urb = dlfb_get_urb(dlfb); |
|
if (!urb) |
|
return 1; /* lost_pixels is set */ |
|
*urb_ptr = urb; |
|
cmd = urb->transfer_buffer; |
|
cmd_end = &cmd[urb->transfer_buffer_length]; |
|
} |
|
} |
|
|
|
*urb_buf_ptr = cmd; |
|
|
|
return 0; |
|
} |
|
|
|
static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) |
|
{ |
|
int i, ret; |
|
char *cmd; |
|
cycles_t start_cycles, end_cycles; |
|
int bytes_sent = 0; |
|
int bytes_identical = 0; |
|
struct urb *urb; |
|
int aligned_x; |
|
|
|
start_cycles = get_cycles(); |
|
|
|
mutex_lock(&dlfb->render_mutex); |
|
|
|
aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); |
|
width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); |
|
x = aligned_x; |
|
|
|
if ((width <= 0) || |
|
(x + width > dlfb->info->var.xres) || |
|
(y + height > dlfb->info->var.yres)) { |
|
ret = -EINVAL; |
|
goto unlock_ret; |
|
} |
|
|
|
if (!atomic_read(&dlfb->usb_active)) { |
|
ret = 0; |
|
goto unlock_ret; |
|
} |
|
|
|
urb = dlfb_get_urb(dlfb); |
|
if (!urb) { |
|
ret = 0; |
|
goto unlock_ret; |
|
} |
|
cmd = urb->transfer_buffer; |
|
|
|
for (i = y; i < y + height ; i++) { |
|
const int line_offset = dlfb->info->fix.line_length * i; |
|
const int byte_offset = line_offset + (x * BPP); |
|
|
|
if (dlfb_render_hline(dlfb, &urb, |
|
(char *) dlfb->info->fix.smem_start, |
|
&cmd, byte_offset, width * BPP, |
|
&bytes_identical, &bytes_sent)) |
|
goto error; |
|
} |
|
|
|
if (cmd > (char *) urb->transfer_buffer) { |
|
int len; |
|
if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) |
|
*cmd++ = 0xAF; |
|
/* Send partial buffer remaining before exiting */ |
|
len = cmd - (char *) urb->transfer_buffer; |
|
dlfb_submit_urb(dlfb, urb, len); |
|
bytes_sent += len; |
|
} else |
|
dlfb_urb_completion(urb); |
|
|
|
error: |
|
atomic_add(bytes_sent, &dlfb->bytes_sent); |
|
atomic_add(bytes_identical, &dlfb->bytes_identical); |
|
atomic_add(width*height*2, &dlfb->bytes_rendered); |
|
end_cycles = get_cycles(); |
|
atomic_add(((unsigned int) ((end_cycles - start_cycles) |
|
>> 10)), /* Kcycles */ |
|
&dlfb->cpu_kcycles_used); |
|
|
|
ret = 0; |
|
|
|
unlock_ret: |
|
mutex_unlock(&dlfb->render_mutex); |
|
return ret; |
|
} |
|
|
|
static void dlfb_init_damage(struct dlfb_data *dlfb) |
|
{ |
|
dlfb->damage_x = INT_MAX; |
|
dlfb->damage_x2 = 0; |
|
dlfb->damage_y = INT_MAX; |
|
dlfb->damage_y2 = 0; |
|
} |
|
|
|
static void dlfb_damage_work(struct work_struct *w) |
|
{ |
|
struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work); |
|
int x, x2, y, y2; |
|
|
|
spin_lock_irq(&dlfb->damage_lock); |
|
x = dlfb->damage_x; |
|
x2 = dlfb->damage_x2; |
|
y = dlfb->damage_y; |
|
y2 = dlfb->damage_y2; |
|
dlfb_init_damage(dlfb); |
|
spin_unlock_irq(&dlfb->damage_lock); |
|
|
|
if (x < x2 && y < y2) |
|
dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y); |
|
} |
|
|
|
static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) |
|
{ |
|
unsigned long flags; |
|
int x2 = x + width; |
|
int y2 = y + height; |
|
|
|
if (x >= x2 || y >= y2) |
|
return; |
|
|
|
spin_lock_irqsave(&dlfb->damage_lock, flags); |
|
dlfb->damage_x = min(x, dlfb->damage_x); |
|
dlfb->damage_x2 = max(x2, dlfb->damage_x2); |
|
dlfb->damage_y = min(y, dlfb->damage_y); |
|
dlfb->damage_y2 = max(y2, dlfb->damage_y2); |
|
spin_unlock_irqrestore(&dlfb->damage_lock, flags); |
|
|
|
schedule_work(&dlfb->damage_work); |
|
} |
|
|
|
/* |
|
* Path triggered by usermode clients who write to filesystem |
|
* e.g. cat filename > /dev/fb1 |
|
* Not used by X Windows or text-mode console. But useful for testing. |
|
* Slow because of extra copy and we must assume all pixels dirty. |
|
*/ |
|
static ssize_t dlfb_ops_write(struct fb_info *info, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
ssize_t result; |
|
struct dlfb_data *dlfb = info->par; |
|
u32 offset = (u32) *ppos; |
|
|
|
result = fb_sys_write(info, buf, count, ppos); |
|
|
|
if (result > 0) { |
|
int start = max((int)(offset / info->fix.line_length), 0); |
|
int lines = min((u32)((result / info->fix.line_length) + 1), |
|
(u32)info->var.yres); |
|
|
|
dlfb_handle_damage(dlfb, 0, start, info->var.xres, |
|
lines); |
|
} |
|
|
|
return result; |
|
} |
|
|
|
/* hardware has native COPY command (see libdlo), but not worth it for fbcon */ |
|
static void dlfb_ops_copyarea(struct fb_info *info, |
|
const struct fb_copyarea *area) |
|
{ |
|
|
|
struct dlfb_data *dlfb = info->par; |
|
|
|
sys_copyarea(info, area); |
|
|
|
dlfb_offload_damage(dlfb, area->dx, area->dy, |
|
area->width, area->height); |
|
} |
|
|
|
static void dlfb_ops_imageblit(struct fb_info *info, |
|
const struct fb_image *image) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
|
|
sys_imageblit(info, image); |
|
|
|
dlfb_offload_damage(dlfb, image->dx, image->dy, |
|
image->width, image->height); |
|
} |
|
|
|
static void dlfb_ops_fillrect(struct fb_info *info, |
|
const struct fb_fillrect *rect) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
|
|
sys_fillrect(info, rect); |
|
|
|
dlfb_offload_damage(dlfb, rect->dx, rect->dy, rect->width, |
|
rect->height); |
|
} |
|
|
|
/* |
|
* NOTE: fb_defio.c is holding info->fbdefio.mutex |
|
* Touching ANY framebuffer memory that triggers a page fault |
|
* in fb_defio will cause a deadlock, when it also tries to |
|
* grab the same mutex. |
|
*/ |
|
static void dlfb_dpy_deferred_io(struct fb_info *info, |
|
struct list_head *pagelist) |
|
{ |
|
struct page *cur; |
|
struct fb_deferred_io *fbdefio = info->fbdefio; |
|
struct dlfb_data *dlfb = info->par; |
|
struct urb *urb; |
|
char *cmd; |
|
cycles_t start_cycles, end_cycles; |
|
int bytes_sent = 0; |
|
int bytes_identical = 0; |
|
int bytes_rendered = 0; |
|
|
|
mutex_lock(&dlfb->render_mutex); |
|
|
|
if (!fb_defio) |
|
goto unlock_ret; |
|
|
|
if (!atomic_read(&dlfb->usb_active)) |
|
goto unlock_ret; |
|
|
|
start_cycles = get_cycles(); |
|
|
|
urb = dlfb_get_urb(dlfb); |
|
if (!urb) |
|
goto unlock_ret; |
|
|
|
cmd = urb->transfer_buffer; |
|
|
|
/* walk the written page list and render each to device */ |
|
list_for_each_entry(cur, &fbdefio->pagelist, lru) { |
|
|
|
if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start, |
|
&cmd, cur->index << PAGE_SHIFT, |
|
PAGE_SIZE, &bytes_identical, &bytes_sent)) |
|
goto error; |
|
bytes_rendered += PAGE_SIZE; |
|
} |
|
|
|
if (cmd > (char *) urb->transfer_buffer) { |
|
int len; |
|
if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) |
|
*cmd++ = 0xAF; |
|
/* Send partial buffer remaining before exiting */ |
|
len = cmd - (char *) urb->transfer_buffer; |
|
dlfb_submit_urb(dlfb, urb, len); |
|
bytes_sent += len; |
|
} else |
|
dlfb_urb_completion(urb); |
|
|
|
error: |
|
atomic_add(bytes_sent, &dlfb->bytes_sent); |
|
atomic_add(bytes_identical, &dlfb->bytes_identical); |
|
atomic_add(bytes_rendered, &dlfb->bytes_rendered); |
|
end_cycles = get_cycles(); |
|
atomic_add(((unsigned int) ((end_cycles - start_cycles) |
|
>> 10)), /* Kcycles */ |
|
&dlfb->cpu_kcycles_used); |
|
unlock_ret: |
|
mutex_unlock(&dlfb->render_mutex); |
|
} |
|
|
|
static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len) |
|
{ |
|
int i, ret; |
|
char *rbuf; |
|
|
|
rbuf = kmalloc(2, GFP_KERNEL); |
|
if (!rbuf) |
|
return 0; |
|
|
|
for (i = 0; i < len; i++) { |
|
ret = usb_control_msg(dlfb->udev, |
|
usb_rcvctrlpipe(dlfb->udev, 0), 0x02, |
|
(0x80 | (0x02 << 5)), i << 8, 0xA1, |
|
rbuf, 2, USB_CTRL_GET_TIMEOUT); |
|
if (ret < 2) { |
|
dev_err(&dlfb->udev->dev, |
|
"Read EDID byte %d failed: %d\n", i, ret); |
|
i--; |
|
break; |
|
} |
|
edid[i] = rbuf[1]; |
|
} |
|
|
|
kfree(rbuf); |
|
|
|
return i; |
|
} |
|
|
|
static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
|
|
struct dlfb_data *dlfb = info->par; |
|
|
|
if (!atomic_read(&dlfb->usb_active)) |
|
return 0; |
|
|
|
/* TODO: Update X server to get this from sysfs instead */ |
|
if (cmd == DLFB_IOCTL_RETURN_EDID) { |
|
void __user *edid = (void __user *)arg; |
|
if (copy_to_user(edid, dlfb->edid, dlfb->edid_size)) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
/* TODO: Help propose a standard fb.h ioctl to report mmap damage */ |
|
if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { |
|
struct dloarea area; |
|
|
|
if (copy_from_user(&area, (void __user *)arg, |
|
sizeof(struct dloarea))) |
|
return -EFAULT; |
|
|
|
/* |
|
* If we have a damage-aware client, turn fb_defio "off" |
|
* To avoid perf imact of unnecessary page fault handling. |
|
* Done by resetting the delay for this fb_info to a very |
|
* long period. Pages will become writable and stay that way. |
|
* Reset to normal value when all clients have closed this fb. |
|
*/ |
|
if (info->fbdefio) |
|
info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE; |
|
|
|
if (area.x < 0) |
|
area.x = 0; |
|
|
|
if (area.x > info->var.xres) |
|
area.x = info->var.xres; |
|
|
|
if (area.y < 0) |
|
area.y = 0; |
|
|
|
if (area.y > info->var.yres) |
|
area.y = info->var.yres; |
|
|
|
dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* taken from vesafb */ |
|
static int |
|
dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, |
|
unsigned blue, unsigned transp, struct fb_info *info) |
|
{ |
|
int err = 0; |
|
|
|
if (regno >= info->cmap.len) |
|
return 1; |
|
|
|
if (regno < 16) { |
|
if (info->var.red.offset == 10) { |
|
/* 1:5:5:5 */ |
|
((u32 *) (info->pseudo_palette))[regno] = |
|
((red & 0xf800) >> 1) | |
|
((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); |
|
} else { |
|
/* 0:5:6:5 */ |
|
((u32 *) (info->pseudo_palette))[regno] = |
|
((red & 0xf800)) | |
|
((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); |
|
} |
|
} |
|
|
|
return err; |
|
} |
|
|
|
/* |
|
* It's common for several clients to have framebuffer open simultaneously. |
|
* e.g. both fbcon and X. Makes things interesting. |
|
* Assumes caller is holding info->lock (for open and release at least) |
|
*/ |
|
static int dlfb_ops_open(struct fb_info *info, int user) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
|
|
/* |
|
* fbcon aggressively connects to first framebuffer it finds, |
|
* preventing other clients (X) from working properly. Usually |
|
* not what the user wants. Fail by default with option to enable. |
|
*/ |
|
if ((user == 0) && (!console)) |
|
return -EBUSY; |
|
|
|
/* If the USB device is gone, we don't accept new opens */ |
|
if (dlfb->virtualized) |
|
return -ENODEV; |
|
|
|
dlfb->fb_count++; |
|
|
|
if (fb_defio && (info->fbdefio == NULL)) { |
|
/* enable defio at last moment if not disabled by client */ |
|
|
|
struct fb_deferred_io *fbdefio; |
|
|
|
fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); |
|
|
|
if (fbdefio) { |
|
fbdefio->delay = DL_DEFIO_WRITE_DELAY; |
|
fbdefio->deferred_io = dlfb_dpy_deferred_io; |
|
} |
|
|
|
info->fbdefio = fbdefio; |
|
fb_deferred_io_init(info); |
|
} |
|
|
|
dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n", |
|
user, info, dlfb->fb_count); |
|
|
|
return 0; |
|
} |
|
|
|
static void dlfb_ops_destroy(struct fb_info *info) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
|
|
cancel_work_sync(&dlfb->damage_work); |
|
|
|
mutex_destroy(&dlfb->render_mutex); |
|
|
|
if (info->cmap.len != 0) |
|
fb_dealloc_cmap(&info->cmap); |
|
if (info->monspecs.modedb) |
|
fb_destroy_modedb(info->monspecs.modedb); |
|
vfree(info->screen_base); |
|
|
|
fb_destroy_modelist(&info->modelist); |
|
|
|
while (!list_empty(&dlfb->deferred_free)) { |
|
struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list); |
|
list_del(&d->list); |
|
vfree(d->mem); |
|
kfree(d); |
|
} |
|
vfree(dlfb->backing_buffer); |
|
kfree(dlfb->edid); |
|
dlfb_free_urb_list(dlfb); |
|
usb_put_dev(dlfb->udev); |
|
kfree(dlfb); |
|
|
|
/* Assume info structure is freed after this point */ |
|
framebuffer_release(info); |
|
} |
|
|
|
/* |
|
* Assumes caller is holding info->lock mutex (for open and release at least) |
|
*/ |
|
static int dlfb_ops_release(struct fb_info *info, int user) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
|
|
dlfb->fb_count--; |
|
|
|
if ((dlfb->fb_count == 0) && (info->fbdefio)) { |
|
fb_deferred_io_cleanup(info); |
|
kfree(info->fbdefio); |
|
info->fbdefio = NULL; |
|
} |
|
|
|
dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Check whether a video mode is supported by the DisplayLink chip |
|
* We start from monitor's modes, so don't need to filter that here |
|
*/ |
|
static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb) |
|
{ |
|
if (mode->xres * mode->yres > dlfb->sku_pixel_limit) |
|
return 0; |
|
|
|
return 1; |
|
} |
|
|
|
static void dlfb_var_color_format(struct fb_var_screeninfo *var) |
|
{ |
|
const struct fb_bitfield red = { 11, 5, 0 }; |
|
const struct fb_bitfield green = { 5, 6, 0 }; |
|
const struct fb_bitfield blue = { 0, 5, 0 }; |
|
|
|
var->bits_per_pixel = 16; |
|
var->red = red; |
|
var->green = green; |
|
var->blue = blue; |
|
} |
|
|
|
static int dlfb_ops_check_var(struct fb_var_screeninfo *var, |
|
struct fb_info *info) |
|
{ |
|
struct fb_videomode mode; |
|
struct dlfb_data *dlfb = info->par; |
|
|
|
/* set device-specific elements of var unrelated to mode */ |
|
dlfb_var_color_format(var); |
|
|
|
fb_var_to_videomode(&mode, var); |
|
|
|
if (!dlfb_is_valid_mode(&mode, dlfb)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static int dlfb_ops_set_par(struct fb_info *info) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
int result; |
|
u16 *pix_framebuffer; |
|
int i; |
|
struct fb_var_screeninfo fvs; |
|
u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8); |
|
|
|
/* clear the activate field because it causes spurious miscompares */ |
|
fvs = info->var; |
|
fvs.activate = 0; |
|
fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN; |
|
|
|
if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo))) |
|
return 0; |
|
|
|
result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length); |
|
if (result) |
|
return result; |
|
|
|
result = dlfb_set_video_mode(dlfb, &info->var); |
|
|
|
if (result) |
|
return result; |
|
|
|
dlfb->current_mode = fvs; |
|
info->fix.line_length = line_length; |
|
|
|
if (dlfb->fb_count == 0) { |
|
|
|
/* paint greenscreen */ |
|
|
|
pix_framebuffer = (u16 *) info->screen_base; |
|
for (i = 0; i < info->fix.smem_len / 2; i++) |
|
pix_framebuffer[i] = 0x37e6; |
|
} |
|
|
|
dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres); |
|
|
|
return 0; |
|
} |
|
|
|
/* To fonzi the jukebox (e.g. make blanking changes take effect) */ |
|
static char *dlfb_dummy_render(char *buf) |
|
{ |
|
*buf++ = 0xAF; |
|
*buf++ = 0x6A; /* copy */ |
|
*buf++ = 0x00; /* from address*/ |
|
*buf++ = 0x00; |
|
*buf++ = 0x00; |
|
*buf++ = 0x01; /* one pixel */ |
|
*buf++ = 0x00; /* to address */ |
|
*buf++ = 0x00; |
|
*buf++ = 0x00; |
|
return buf; |
|
} |
|
|
|
/* |
|
* In order to come back from full DPMS off, we need to set the mode again |
|
*/ |
|
static int dlfb_ops_blank(int blank_mode, struct fb_info *info) |
|
{ |
|
struct dlfb_data *dlfb = info->par; |
|
char *bufptr; |
|
struct urb *urb; |
|
|
|
dev_dbg(info->dev, "blank, mode %d --> %d\n", |
|
dlfb->blank_mode, blank_mode); |
|
|
|
if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) && |
|
(blank_mode != FB_BLANK_POWERDOWN)) { |
|
|
|
/* returning from powerdown requires a fresh modeset */ |
|
dlfb_set_video_mode(dlfb, &info->var); |
|
} |
|
|
|
urb = dlfb_get_urb(dlfb); |
|
if (!urb) |
|
return 0; |
|
|
|
bufptr = (char *) urb->transfer_buffer; |
|
bufptr = dlfb_vidreg_lock(bufptr); |
|
bufptr = dlfb_blanking(bufptr, blank_mode); |
|
bufptr = dlfb_vidreg_unlock(bufptr); |
|
|
|
/* seems like a render op is needed to have blank change take effect */ |
|
bufptr = dlfb_dummy_render(bufptr); |
|
|
|
dlfb_submit_urb(dlfb, urb, bufptr - |
|
(char *) urb->transfer_buffer); |
|
|
|
dlfb->blank_mode = blank_mode; |
|
|
|
return 0; |
|
} |
|
|
|
static const struct fb_ops dlfb_ops = { |
|
.owner = THIS_MODULE, |
|
.fb_read = fb_sys_read, |
|
.fb_write = dlfb_ops_write, |
|
.fb_setcolreg = dlfb_ops_setcolreg, |
|
.fb_fillrect = dlfb_ops_fillrect, |
|
.fb_copyarea = dlfb_ops_copyarea, |
|
.fb_imageblit = dlfb_ops_imageblit, |
|
.fb_mmap = dlfb_ops_mmap, |
|
.fb_ioctl = dlfb_ops_ioctl, |
|
.fb_open = dlfb_ops_open, |
|
.fb_release = dlfb_ops_release, |
|
.fb_blank = dlfb_ops_blank, |
|
.fb_check_var = dlfb_ops_check_var, |
|
.fb_set_par = dlfb_ops_set_par, |
|
.fb_destroy = dlfb_ops_destroy, |
|
}; |
|
|
|
|
|
static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem) |
|
{ |
|
struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL); |
|
if (!d) |
|
return; |
|
d->mem = mem; |
|
list_add(&d->list, &dlfb->deferred_free); |
|
} |
|
|
|
/* |
|
* Assumes &info->lock held by caller |
|
* Assumes no active clients have framebuffer open |
|
*/ |
|
static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len) |
|
{ |
|
u32 old_len = info->fix.smem_len; |
|
const void *old_fb = (const void __force *)info->screen_base; |
|
unsigned char *new_fb; |
|
unsigned char *new_back = NULL; |
|
|
|
new_len = PAGE_ALIGN(new_len); |
|
|
|
if (new_len > old_len) { |
|
/* |
|
* Alloc system memory for virtual framebuffer |
|
*/ |
|
new_fb = vmalloc(new_len); |
|
if (!new_fb) { |
|
dev_err(info->dev, "Virtual framebuffer alloc failed\n"); |
|
return -ENOMEM; |
|
} |
|
memset(new_fb, 0xff, new_len); |
|
|
|
if (info->screen_base) { |
|
memcpy(new_fb, old_fb, old_len); |
|
dlfb_deferred_vfree(dlfb, (void __force *)info->screen_base); |
|
} |
|
|
|
info->screen_base = (char __iomem *)new_fb; |
|
info->fix.smem_len = new_len; |
|
info->fix.smem_start = (unsigned long) new_fb; |
|
info->flags = udlfb_info_flags; |
|
|
|
/* |
|
* Second framebuffer copy to mirror the framebuffer state |
|
* on the physical USB device. We can function without this. |
|
* But with imperfect damage info we may send pixels over USB |
|
* that were, in fact, unchanged - wasting limited USB bandwidth |
|
*/ |
|
if (shadow) |
|
new_back = vzalloc(new_len); |
|
if (!new_back) |
|
dev_info(info->dev, |
|
"No shadow/backing buffer allocated\n"); |
|
else { |
|
dlfb_deferred_vfree(dlfb, dlfb->backing_buffer); |
|
dlfb->backing_buffer = new_back; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
/* |
|
* 1) Get EDID from hw, or use sw default |
|
* 2) Parse into various fb_info structs |
|
* 3) Allocate virtual framebuffer memory to back highest res mode |
|
* |
|
* Parses EDID into three places used by various parts of fbdev: |
|
* fb_var_screeninfo contains the timing of the monitor's preferred mode |
|
* fb_info.monspecs is full parsed EDID info, including monspecs.modedb |
|
* fb_info.modelist is a linked list of all monitor & VESA modes which work |
|
* |
|
* If EDID is not readable/valid, then modelist is all VESA modes, |
|
* monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode |
|
* Returns 0 if successful |
|
*/ |
|
static int dlfb_setup_modes(struct dlfb_data *dlfb, |
|
struct fb_info *info, |
|
char *default_edid, size_t default_edid_size) |
|
{ |
|
char *edid; |
|
int i, result = 0, tries = 3; |
|
struct device *dev = info->device; |
|
struct fb_videomode *mode; |
|
const struct fb_videomode *default_vmode = NULL; |
|
|
|
if (info->dev) { |
|
/* only use mutex if info has been registered */ |
|
mutex_lock(&info->lock); |
|
/* parent device is used otherwise */ |
|
dev = info->dev; |
|
} |
|
|
|
edid = kmalloc(EDID_LENGTH, GFP_KERNEL); |
|
if (!edid) { |
|
result = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
fb_destroy_modelist(&info->modelist); |
|
memset(&info->monspecs, 0, sizeof(info->monspecs)); |
|
|
|
/* |
|
* Try to (re)read EDID from hardware first |
|
* EDID data may return, but not parse as valid |
|
* Try again a few times, in case of e.g. analog cable noise |
|
*/ |
|
while (tries--) { |
|
|
|
i = dlfb_get_edid(dlfb, edid, EDID_LENGTH); |
|
|
|
if (i >= EDID_LENGTH) |
|
fb_edid_to_monspecs(edid, &info->monspecs); |
|
|
|
if (info->monspecs.modedb_len > 0) { |
|
dlfb->edid = edid; |
|
dlfb->edid_size = i; |
|
break; |
|
} |
|
} |
|
|
|
/* If that fails, use a previously returned EDID if available */ |
|
if (info->monspecs.modedb_len == 0) { |
|
dev_err(dev, "Unable to get valid EDID from device/display\n"); |
|
|
|
if (dlfb->edid) { |
|
fb_edid_to_monspecs(dlfb->edid, &info->monspecs); |
|
if (info->monspecs.modedb_len > 0) |
|
dev_err(dev, "Using previously queried EDID\n"); |
|
} |
|
} |
|
|
|
/* If that fails, use the default EDID we were handed */ |
|
if (info->monspecs.modedb_len == 0) { |
|
if (default_edid_size >= EDID_LENGTH) { |
|
fb_edid_to_monspecs(default_edid, &info->monspecs); |
|
if (info->monspecs.modedb_len > 0) { |
|
memcpy(edid, default_edid, default_edid_size); |
|
dlfb->edid = edid; |
|
dlfb->edid_size = default_edid_size; |
|
dev_err(dev, "Using default/backup EDID\n"); |
|
} |
|
} |
|
} |
|
|
|
/* If we've got modes, let's pick a best default mode */ |
|
if (info->monspecs.modedb_len > 0) { |
|
|
|
for (i = 0; i < info->monspecs.modedb_len; i++) { |
|
mode = &info->monspecs.modedb[i]; |
|
if (dlfb_is_valid_mode(mode, dlfb)) { |
|
fb_add_videomode(mode, &info->modelist); |
|
} else { |
|
dev_dbg(dev, "Specified mode %dx%d too big\n", |
|
mode->xres, mode->yres); |
|
if (i == 0) |
|
/* if we've removed top/best mode */ |
|
info->monspecs.misc |
|
&= ~FB_MISC_1ST_DETAIL; |
|
} |
|
} |
|
|
|
default_vmode = fb_find_best_display(&info->monspecs, |
|
&info->modelist); |
|
} |
|
|
|
/* If everything else has failed, fall back to safe default mode */ |
|
if (default_vmode == NULL) { |
|
|
|
struct fb_videomode fb_vmode = {0}; |
|
|
|
/* |
|
* Add the standard VESA modes to our modelist |
|
* Since we don't have EDID, there may be modes that |
|
* overspec monitor and/or are incorrect aspect ratio, etc. |
|
* But at least the user has a chance to choose |
|
*/ |
|
for (i = 0; i < VESA_MODEDB_SIZE; i++) { |
|
mode = (struct fb_videomode *)&vesa_modes[i]; |
|
if (dlfb_is_valid_mode(mode, dlfb)) |
|
fb_add_videomode(mode, &info->modelist); |
|
else |
|
dev_dbg(dev, "VESA mode %dx%d too big\n", |
|
mode->xres, mode->yres); |
|
} |
|
|
|
/* |
|
* default to resolution safe for projectors |
|
* (since they are most common case without EDID) |
|
*/ |
|
fb_vmode.xres = 800; |
|
fb_vmode.yres = 600; |
|
fb_vmode.refresh = 60; |
|
default_vmode = fb_find_nearest_mode(&fb_vmode, |
|
&info->modelist); |
|
} |
|
|
|
/* If we have good mode and no active clients*/ |
|
if ((default_vmode != NULL) && (dlfb->fb_count == 0)) { |
|
|
|
fb_videomode_to_var(&info->var, default_vmode); |
|
dlfb_var_color_format(&info->var); |
|
|
|
/* |
|
* with mode size info, we can now alloc our framebuffer. |
|
*/ |
|
memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); |
|
} else |
|
result = -EINVAL; |
|
|
|
error: |
|
if (edid && (dlfb->edid != edid)) |
|
kfree(edid); |
|
|
|
if (info->dev) |
|
mutex_unlock(&info->lock); |
|
|
|
return result; |
|
} |
|
|
|
static ssize_t metrics_bytes_rendered_show(struct device *fbdev, |
|
struct device_attribute *a, char *buf) { |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
return snprintf(buf, PAGE_SIZE, "%u\n", |
|
atomic_read(&dlfb->bytes_rendered)); |
|
} |
|
|
|
static ssize_t metrics_bytes_identical_show(struct device *fbdev, |
|
struct device_attribute *a, char *buf) { |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
return snprintf(buf, PAGE_SIZE, "%u\n", |
|
atomic_read(&dlfb->bytes_identical)); |
|
} |
|
|
|
static ssize_t metrics_bytes_sent_show(struct device *fbdev, |
|
struct device_attribute *a, char *buf) { |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
return snprintf(buf, PAGE_SIZE, "%u\n", |
|
atomic_read(&dlfb->bytes_sent)); |
|
} |
|
|
|
static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, |
|
struct device_attribute *a, char *buf) { |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
return snprintf(buf, PAGE_SIZE, "%u\n", |
|
atomic_read(&dlfb->cpu_kcycles_used)); |
|
} |
|
|
|
static ssize_t edid_show( |
|
struct file *filp, |
|
struct kobject *kobj, struct bin_attribute *a, |
|
char *buf, loff_t off, size_t count) { |
|
struct device *fbdev = kobj_to_dev(kobj); |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
|
|
if (dlfb->edid == NULL) |
|
return 0; |
|
|
|
if ((off >= dlfb->edid_size) || (count > dlfb->edid_size)) |
|
return 0; |
|
|
|
if (off + count > dlfb->edid_size) |
|
count = dlfb->edid_size - off; |
|
|
|
memcpy(buf, dlfb->edid, count); |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t edid_store( |
|
struct file *filp, |
|
struct kobject *kobj, struct bin_attribute *a, |
|
char *src, loff_t src_off, size_t src_size) { |
|
struct device *fbdev = kobj_to_dev(kobj); |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
int ret; |
|
|
|
/* We only support write of entire EDID at once, no offset*/ |
|
if ((src_size != EDID_LENGTH) || (src_off != 0)) |
|
return -EINVAL; |
|
|
|
ret = dlfb_setup_modes(dlfb, fb_info, src, src_size); |
|
if (ret) |
|
return ret; |
|
|
|
if (!dlfb->edid || memcmp(src, dlfb->edid, src_size)) |
|
return -EINVAL; |
|
|
|
ret = dlfb_ops_set_par(fb_info); |
|
if (ret) |
|
return ret; |
|
|
|
return src_size; |
|
} |
|
|
|
static ssize_t metrics_reset_store(struct device *fbdev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct fb_info *fb_info = dev_get_drvdata(fbdev); |
|
struct dlfb_data *dlfb = fb_info->par; |
|
|
|
atomic_set(&dlfb->bytes_rendered, 0); |
|
atomic_set(&dlfb->bytes_identical, 0); |
|
atomic_set(&dlfb->bytes_sent, 0); |
|
atomic_set(&dlfb->cpu_kcycles_used, 0); |
|
|
|
return count; |
|
} |
|
|
|
static const struct bin_attribute edid_attr = { |
|
.attr.name = "edid", |
|
.attr.mode = 0666, |
|
.size = EDID_LENGTH, |
|
.read = edid_show, |
|
.write = edid_store |
|
}; |
|
|
|
static const struct device_attribute fb_device_attrs[] = { |
|
__ATTR_RO(metrics_bytes_rendered), |
|
__ATTR_RO(metrics_bytes_identical), |
|
__ATTR_RO(metrics_bytes_sent), |
|
__ATTR_RO(metrics_cpu_kcycles_used), |
|
__ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), |
|
}; |
|
|
|
/* |
|
* This is necessary before we can communicate with the display controller. |
|
*/ |
|
static int dlfb_select_std_channel(struct dlfb_data *dlfb) |
|
{ |
|
int ret; |
|
void *buf; |
|
static const u8 set_def_chn[] = { |
|
0x57, 0xCD, 0xDC, 0xA7, |
|
0x1C, 0x88, 0x5E, 0x15, |
|
0x60, 0xFE, 0xC6, 0x97, |
|
0x16, 0x3D, 0x47, 0xF2 }; |
|
|
|
buf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL); |
|
|
|
if (!buf) |
|
return -ENOMEM; |
|
|
|
ret = usb_control_msg(dlfb->udev, usb_sndctrlpipe(dlfb->udev, 0), |
|
NR_USB_REQUEST_CHANNEL, |
|
(USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, |
|
buf, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT); |
|
|
|
kfree(buf); |
|
|
|
return ret; |
|
} |
|
|
|
static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb, |
|
struct usb_interface *intf) |
|
{ |
|
char *desc; |
|
char *buf; |
|
char *desc_end; |
|
int total_len; |
|
|
|
buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); |
|
if (!buf) |
|
return false; |
|
desc = buf; |
|
|
|
total_len = usb_get_descriptor(interface_to_usbdev(intf), |
|
0x5f, /* vendor specific */ |
|
0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); |
|
|
|
/* if not found, look in configuration descriptor */ |
|
if (total_len < 0) { |
|
if (0 == usb_get_extra_descriptor(intf->cur_altsetting, |
|
0x5f, &desc)) |
|
total_len = (int) desc[0]; |
|
} |
|
|
|
if (total_len > 5) { |
|
dev_info(&intf->dev, |
|
"vendor descriptor length: %d data: %11ph\n", |
|
total_len, desc); |
|
|
|
if ((desc[0] != total_len) || /* descriptor length */ |
|
(desc[1] != 0x5f) || /* vendor descriptor type */ |
|
(desc[2] != 0x01) || /* version (2 bytes) */ |
|
(desc[3] != 0x00) || |
|
(desc[4] != total_len - 2)) /* length after type */ |
|
goto unrecognized; |
|
|
|
desc_end = desc + total_len; |
|
desc += 5; /* the fixed header we've already parsed */ |
|
|
|
while (desc < desc_end) { |
|
u8 length; |
|
u16 key; |
|
|
|
key = *desc++; |
|
key |= (u16)*desc++ << 8; |
|
length = *desc++; |
|
|
|
switch (key) { |
|
case 0x0200: { /* max_area */ |
|
u32 max_area = *desc++; |
|
max_area |= (u32)*desc++ << 8; |
|
max_area |= (u32)*desc++ << 16; |
|
max_area |= (u32)*desc++ << 24; |
|
dev_warn(&intf->dev, |
|
"DL chip limited to %d pixel modes\n", |
|
max_area); |
|
dlfb->sku_pixel_limit = max_area; |
|
break; |
|
} |
|
default: |
|
break; |
|
} |
|
desc += length; |
|
} |
|
} else { |
|
dev_info(&intf->dev, "vendor descriptor not available (%d)\n", |
|
total_len); |
|
} |
|
|
|
goto success; |
|
|
|
unrecognized: |
|
/* allow udlfb to load for now even if firmware unrecognized */ |
|
dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n"); |
|
|
|
success: |
|
kfree(buf); |
|
return true; |
|
} |
|
|
|
static int dlfb_usb_probe(struct usb_interface *intf, |
|
const struct usb_device_id *id) |
|
{ |
|
int i; |
|
const struct device_attribute *attr; |
|
struct dlfb_data *dlfb; |
|
struct fb_info *info; |
|
int retval = -ENOMEM; |
|
struct usb_device *usbdev = interface_to_usbdev(intf); |
|
|
|
/* usb initialization */ |
|
dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL); |
|
if (!dlfb) { |
|
dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__); |
|
return -ENOMEM; |
|
} |
|
|
|
INIT_LIST_HEAD(&dlfb->deferred_free); |
|
|
|
dlfb->udev = usb_get_dev(usbdev); |
|
usb_set_intfdata(intf, dlfb); |
|
|
|
dev_dbg(&intf->dev, "console enable=%d\n", console); |
|
dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio); |
|
dev_dbg(&intf->dev, "shadow enable=%d\n", shadow); |
|
|
|
dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */ |
|
|
|
if (!dlfb_parse_vendor_descriptor(dlfb, intf)) { |
|
dev_err(&intf->dev, |
|
"firmware not recognized, incompatible device?\n"); |
|
goto error; |
|
} |
|
|
|
if (pixel_limit) { |
|
dev_warn(&intf->dev, |
|
"DL chip limit of %d overridden to %d\n", |
|
dlfb->sku_pixel_limit, pixel_limit); |
|
dlfb->sku_pixel_limit = pixel_limit; |
|
} |
|
|
|
|
|
/* allocates framebuffer driver structure, not framebuffer memory */ |
|
info = framebuffer_alloc(0, &dlfb->udev->dev); |
|
if (!info) |
|
goto error; |
|
|
|
dlfb->info = info; |
|
info->par = dlfb; |
|
info->pseudo_palette = dlfb->pseudo_palette; |
|
dlfb->ops = dlfb_ops; |
|
info->fbops = &dlfb->ops; |
|
|
|
mutex_init(&dlfb->render_mutex); |
|
dlfb_init_damage(dlfb); |
|
spin_lock_init(&dlfb->damage_lock); |
|
INIT_WORK(&dlfb->damage_work, dlfb_damage_work); |
|
|
|
INIT_LIST_HEAD(&info->modelist); |
|
|
|
if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) { |
|
retval = -ENOMEM; |
|
dev_err(&intf->dev, "unable to allocate urb list\n"); |
|
goto error; |
|
} |
|
|
|
/* We don't register a new USB class. Our client interface is dlfbev */ |
|
|
|
retval = fb_alloc_cmap(&info->cmap, 256, 0); |
|
if (retval < 0) { |
|
dev_err(info->device, "cmap allocation failed: %d\n", retval); |
|
goto error; |
|
} |
|
|
|
retval = dlfb_setup_modes(dlfb, info, NULL, 0); |
|
if (retval != 0) { |
|
dev_err(info->device, |
|
"unable to find common mode for display and adapter\n"); |
|
goto error; |
|
} |
|
|
|
/* ready to begin using device */ |
|
|
|
atomic_set(&dlfb->usb_active, 1); |
|
dlfb_select_std_channel(dlfb); |
|
|
|
dlfb_ops_check_var(&info->var, info); |
|
retval = dlfb_ops_set_par(info); |
|
if (retval) |
|
goto error; |
|
|
|
retval = register_framebuffer(info); |
|
if (retval < 0) { |
|
dev_err(info->device, "unable to register framebuffer: %d\n", |
|
retval); |
|
goto error; |
|
} |
|
|
|
for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { |
|
attr = &fb_device_attrs[i]; |
|
retval = device_create_file(info->dev, attr); |
|
if (retval) |
|
dev_warn(info->device, |
|
"failed to create '%s' attribute: %d\n", |
|
attr->attr.name, retval); |
|
} |
|
|
|
retval = device_create_bin_file(info->dev, &edid_attr); |
|
if (retval) |
|
dev_warn(info->device, "failed to create '%s' attribute: %d\n", |
|
edid_attr.attr.name, retval); |
|
|
|
dev_info(info->device, |
|
"%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n", |
|
dev_name(info->dev), info->var.xres, info->var.yres, |
|
((dlfb->backing_buffer) ? |
|
info->fix.smem_len * 2 : info->fix.smem_len) >> 10); |
|
return 0; |
|
|
|
error: |
|
if (dlfb->info) { |
|
dlfb_ops_destroy(dlfb->info); |
|
} else { |
|
usb_put_dev(dlfb->udev); |
|
kfree(dlfb); |
|
} |
|
return retval; |
|
} |
|
|
|
static void dlfb_usb_disconnect(struct usb_interface *intf) |
|
{ |
|
struct dlfb_data *dlfb; |
|
struct fb_info *info; |
|
int i; |
|
|
|
dlfb = usb_get_intfdata(intf); |
|
info = dlfb->info; |
|
|
|
dev_dbg(&intf->dev, "USB disconnect starting\n"); |
|
|
|
/* we virtualize until all fb clients release. Then we free */ |
|
dlfb->virtualized = true; |
|
|
|
/* When non-active we'll update virtual framebuffer, but no new urbs */ |
|
atomic_set(&dlfb->usb_active, 0); |
|
|
|
/* this function will wait for all in-flight urbs to complete */ |
|
dlfb_free_urb_list(dlfb); |
|
|
|
/* remove udlfb's sysfs interfaces */ |
|
for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) |
|
device_remove_file(info->dev, &fb_device_attrs[i]); |
|
device_remove_bin_file(info->dev, &edid_attr); |
|
|
|
unregister_framebuffer(info); |
|
} |
|
|
|
static struct usb_driver dlfb_driver = { |
|
.name = "udlfb", |
|
.probe = dlfb_usb_probe, |
|
.disconnect = dlfb_usb_disconnect, |
|
.id_table = id_table, |
|
}; |
|
|
|
module_usb_driver(dlfb_driver); |
|
|
|
static void dlfb_urb_completion(struct urb *urb) |
|
{ |
|
struct urb_node *unode = urb->context; |
|
struct dlfb_data *dlfb = unode->dlfb; |
|
unsigned long flags; |
|
|
|
switch (urb->status) { |
|
case 0: |
|
/* success */ |
|
break; |
|
case -ECONNRESET: |
|
case -ENOENT: |
|
case -ESHUTDOWN: |
|
/* sync/async unlink faults aren't errors */ |
|
break; |
|
default: |
|
dev_err(&dlfb->udev->dev, |
|
"%s - nonzero write bulk status received: %d\n", |
|
__func__, urb->status); |
|
atomic_set(&dlfb->lost_pixels, 1); |
|
break; |
|
} |
|
|
|
urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */ |
|
|
|
spin_lock_irqsave(&dlfb->urbs.lock, flags); |
|
list_add_tail(&unode->entry, &dlfb->urbs.list); |
|
dlfb->urbs.available++; |
|
spin_unlock_irqrestore(&dlfb->urbs.lock, flags); |
|
|
|
up(&dlfb->urbs.limit_sem); |
|
} |
|
|
|
static void dlfb_free_urb_list(struct dlfb_data *dlfb) |
|
{ |
|
int count = dlfb->urbs.count; |
|
struct list_head *node; |
|
struct urb_node *unode; |
|
struct urb *urb; |
|
|
|
/* keep waiting and freeing, until we've got 'em all */ |
|
while (count--) { |
|
down(&dlfb->urbs.limit_sem); |
|
|
|
spin_lock_irq(&dlfb->urbs.lock); |
|
|
|
node = dlfb->urbs.list.next; /* have reserved one with sem */ |
|
list_del_init(node); |
|
|
|
spin_unlock_irq(&dlfb->urbs.lock); |
|
|
|
unode = list_entry(node, struct urb_node, entry); |
|
urb = unode->urb; |
|
|
|
/* Free each separately allocated piece */ |
|
usb_free_coherent(urb->dev, dlfb->urbs.size, |
|
urb->transfer_buffer, urb->transfer_dma); |
|
usb_free_urb(urb); |
|
kfree(node); |
|
} |
|
|
|
dlfb->urbs.count = 0; |
|
} |
|
|
|
static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) |
|
{ |
|
struct urb *urb; |
|
struct urb_node *unode; |
|
char *buf; |
|
size_t wanted_size = count * size; |
|
|
|
spin_lock_init(&dlfb->urbs.lock); |
|
|
|
retry: |
|
dlfb->urbs.size = size; |
|
INIT_LIST_HEAD(&dlfb->urbs.list); |
|
|
|
sema_init(&dlfb->urbs.limit_sem, 0); |
|
dlfb->urbs.count = 0; |
|
dlfb->urbs.available = 0; |
|
|
|
while (dlfb->urbs.count * size < wanted_size) { |
|
unode = kzalloc(sizeof(*unode), GFP_KERNEL); |
|
if (!unode) |
|
break; |
|
unode->dlfb = dlfb; |
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!urb) { |
|
kfree(unode); |
|
break; |
|
} |
|
unode->urb = urb; |
|
|
|
buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, |
|
&urb->transfer_dma); |
|
if (!buf) { |
|
kfree(unode); |
|
usb_free_urb(urb); |
|
if (size > PAGE_SIZE) { |
|
size /= 2; |
|
dlfb_free_urb_list(dlfb); |
|
goto retry; |
|
} |
|
break; |
|
} |
|
|
|
/* urb->transfer_buffer_length set to actual before submit */ |
|
usb_fill_bulk_urb(urb, dlfb->udev, usb_sndbulkpipe(dlfb->udev, 1), |
|
buf, size, dlfb_urb_completion, unode); |
|
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
|
|
|
list_add_tail(&unode->entry, &dlfb->urbs.list); |
|
|
|
up(&dlfb->urbs.limit_sem); |
|
dlfb->urbs.count++; |
|
dlfb->urbs.available++; |
|
} |
|
|
|
return dlfb->urbs.count; |
|
} |
|
|
|
static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) |
|
{ |
|
int ret; |
|
struct list_head *entry; |
|
struct urb_node *unode; |
|
|
|
/* Wait for an in-flight buffer to complete and get re-queued */ |
|
ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); |
|
if (ret) { |
|
atomic_set(&dlfb->lost_pixels, 1); |
|
dev_warn(&dlfb->udev->dev, |
|
"wait for urb interrupted: %d available: %d\n", |
|
ret, dlfb->urbs.available); |
|
return NULL; |
|
} |
|
|
|
spin_lock_irq(&dlfb->urbs.lock); |
|
|
|
BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ |
|
entry = dlfb->urbs.list.next; |
|
list_del_init(entry); |
|
dlfb->urbs.available--; |
|
|
|
spin_unlock_irq(&dlfb->urbs.lock); |
|
|
|
unode = list_entry(entry, struct urb_node, entry); |
|
return unode->urb; |
|
} |
|
|
|
static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len) |
|
{ |
|
int ret; |
|
|
|
BUG_ON(len > dlfb->urbs.size); |
|
|
|
urb->transfer_buffer_length = len; /* set to actual payload len */ |
|
ret = usb_submit_urb(urb, GFP_KERNEL); |
|
if (ret) { |
|
dlfb_urb_completion(urb); /* because no one else will */ |
|
atomic_set(&dlfb->lost_pixels, 1); |
|
dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret); |
|
} |
|
return ret; |
|
} |
|
|
|
module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
|
MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); |
|
|
|
module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
|
MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); |
|
|
|
module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
|
MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); |
|
|
|
module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); |
|
MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); |
|
|
|
MODULE_AUTHOR("Roberto De Ioris <[email protected]>, " |
|
"Jaya Kumar <[email protected]>, " |
|
"Bernie Thompson <[email protected]>"); |
|
MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
|