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Mauro Carvalho Chehab 3687e1e67e V4L/DVB (7179): Allow more than one em28xx board 
em28xx driver is capable of handling more than one usb device. However, isoc
transfers require a large amount of data to be transfered.

Before this patch, just one em28xx board were enough to allocate more than 50%
URBs:

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480 MxCh= 8
B:  Alloc=480/800 us (60%), #Int=  0, #Iso=  2
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1

So, only one board could use an USB host at the same time. After the patch, it
is possible to use more than one em28xx at the same time, on the same usb host,
if the image size is slower or equal to 345600, since those images will
require about 30% of the URBs:

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480 MxCh= 8
B:  Alloc=232/800 us (29%), #Int=  0, #Iso=  2
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1

So, in thesis, after the patch, it would be possible to use up to 3 boards by
each usb host, if the devices are generating small images.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
 		2008-02-18 11:15:17 -03:00
..
acorn/char
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acpi Merge branches 'release', 'dmi', 'idle' and 'misc' into release 2008-02-14 02:44:28 -05:00
amba
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ata ata: fix sparse warning in pata_acpi.c 2008-02-15 13:51:33 -05:00
atm
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auxdisplay
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base Driver core: Revert "Fix Firmware class name collision" 2008-02-07 11:31:46 -08:00
block Fix compile of swim3 as module 2008-02-14 20:58:04 -08:00
bluetooth hci_ldisc: fix null pointer deref 2008-02-12 17:54:16 -08:00
cdrom Merge branch 'for-2.6.25' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-02-07 09:02:26 -08:00
char [POWERPC] hvc_rtas_init() must be __init 2008-02-14 22:11:02 +11:00
clocksource
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connector
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cpufreq [CPUFREQ] fix configuration help message 2008-02-06 22:57:58 -05:00
cpuidle ACPI, cpuidle: Clarify C-state description in sysfs 2008-02-14 00:09:55 -05:00
crypto
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dca DCA: convert struct class_device to struct device. 2008-02-08 15:33:33 -08:00
dio dio: ARRAY_SIZE() cleanup 2008-02-05 09:44:23 -08:00
dma async_tx: replace 'int_en' with operation preparation flags 2008-02-06 10:12:18 -07:00
edac drivers/edac/i3000: document type promotion 2008-02-07 08:42:23 -08:00
eisa
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firewire
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firmware SMBIOS/DMI: add type 41 = Onboard Devices Extended Information 2008-02-08 09:22:37 -08:00
gpio gpio: handle pca953{4,5,6,7,8} too 2008-02-06 10:41:15 -08:00
hid HID: add USB IDs for MacBook 3rd generation 2008-02-13 17:08:04 +01:00
hwmon hwmon: (lm80) Add individual alarm files 2008-02-07 20:39:45 -05:00
i2c hwmon: Discard useless I2C driver IDs 2008-02-07 20:39:44 -05:00
ide ide: remove stale comment from ide-lib.c 2008-02-11 00:32:15 +01:00
ieee1394
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infiniband RDMA/cma: Do not issue MRA if user rejects connection request 2008-02-14 15:30:41 -08:00
input mn10300: add the MN10300/AM33 architecture to the kernel 2008-02-08 09:22:30 -08:00
isdn isdn: fix section mismatch warning for ISACVer 2008-02-09 23:29:28 -08:00
leds PWM LED driver 2008-02-08 09:22:38 -08:00
lguest lguest: accept guest _PAGE_PWT page table entries 2008-02-09 23:24:09 +01:00
macintosh Fix compile of swim3 as module 2008-02-14 20:58:04 -08:00
mca
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md d_path: Make d_path() use a struct path 2008-02-14 21:17:09 -08:00
media V4L/DVB (7179): Allow more than one em28xx board 2008-02-18 11:15:17 -03:00
memstick drivers/memstick/host/tifm_ms.c breakage 2008-02-13 08:16:35 -08:00
message [SCSI] mpt fusion: Request I/O resources only when required 2008-02-11 10:20:54 -06:00
mfd ASIC3 driver 2008-02-07 08:42:23 -08:00
misc thinkpad_acpi: static 2008-02-14 01:01:28 -05:00
mmc mmc: extend ricoh_mmc to support Ricoh RL5c476 2008-02-08 09:02:47 +01:00
mtd Introduce path_put() 2008-02-14 21:13:33 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-02-15 07:33:07 -08:00
nubus nubus: kill drivers/nubus/nubus_syms.c 2008-02-05 09:44:23 -08:00
of [POWERPC] Create and hook up of_platform_device_shutdown 2008-02-06 16:29:59 +11:00
oprofile d_path: Make get_dcookie() use a struct path argument 2008-02-14 21:17:08 -08:00
parisc iommu sg merging: parisc: make iommu respect the segment size limits 2008-02-05 09:44:10 -08:00
parport parport: section fixup 2008-02-13 16:21:19 -08:00
pci mn10300: add the MN10300/AM33 architecture to the kernel 2008-02-08 09:22:30 -08:00
pcmcia ide: introduce HAVE_IDE 2008-02-09 10:46:40 +01:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-02-14 21:29:46 -08:00
power Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-02-07 09:45:58 -08:00
ps3 [POWERPC] PS3: Update sys-manager button events 2008-02-14 22:11:01 +11:00
rapidio
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rtc rtc-r9701.c: silence compiler warning 2008-02-09 23:27:01 -08:00
s390 claw/lcs/netiucv: check s390dbf level before sprints 2008-02-11 11:14:50 -05:00
sbus
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scsi [SCSI] gdth: update deprecated pci_find_device 2008-02-13 09:33:10 -06:00
serial serial: sh-sci: Fix up SH-5 build. 2008-02-14 14:22:12 +09:00
sh maple: improve detection of attached peripherals 2008-02-14 14:22:11 +09:00
sn
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spi spi: remove more dev->power.power_state usage 2008-02-06 10:41:11 -08:00
ssb drivers/ssb/: Spelling fixes 2008-02-03 17:30:25 +02:00
tc
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telephony
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thermal ACPI: thermal: syntax, spelling, kernel-doc 2008-02-07 23:48:04 -05:00
uio uio: nopage 2008-02-06 10:41:07 -08:00
usb d_path: Make d_path() use a struct path 2008-02-14 21:17:09 -08:00
video mn10300: add the MN10300/AM33 architecture to the kernel 2008-02-08 09:22:30 -08:00
virtio virtio: add missing #include <linux/delay.h> 2008-02-06 10:41:21 -08:00
w1 DS1WM: decouple host IRQ and INTR active state settings 2008-02-07 08:42:06 -08:00
watchdog drivers/watchdog/: Spelling fixes 2008-02-03 17:32:52 +02:00
xen
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zorro
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Kconfig memstick: initial commit for Sony MemoryStick support 2008-02-09 11:08:34 -08:00
Makefile memstick: initial commit for Sony MemoryStick support 2008-02-09 11:08:34 -08:00