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authorMauro Carvalho Chehab <mchehab@infradead.org>2008-02-08 15:44:25 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-02-18 11:15:17 -0300
commit3687e1e67e4920a202d53cc24678fb34fcda8fc5 (patch)
tree690923e60041a813ffbe4c03a9c0822ecb0402b8 /crypto/Makefile
parent92ea42f442c4895e38f525a097d7d8ce2a55b9b9 (diff)
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>
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