Lines Matching +full:keep +full:- +full:power +full:- +full:in +full:- +full:suspend
5 27-Dec-2002
8 USB 2.0-capable host controller hardware. The USB 2.0 standard is
11 - "High Speed" 480 Mbit/sec (60 MByte/sec)
12 - "Full Speed" 12 Mbit/sec (1.5 MByte/sec)
13 - "Low Speed" 1.5 Mbit/sec
23 (TT) in the hub, which turns low or full speed transactions into
27 of EHCI from (in alphabetical order): Intel, NEC, Philips, and VIA.
31 While usb-storage devices have been available since mid-2001 (working
34 appear to be on hold until more systems come with USB 2.0 built-in.
36 more typical in the second half of 2002.
39 other changes to the Linux-USB core APIs, including the hub driver,
43 - David Brownell
56 --------------
60 transaction translators (TTs) in USB 2.0 hubs. But you may find bugs.
72 ---------------
84 There are some issues with power management; suspend/resume doesn't
99 # modprobe ehci-hcd
103 # rmmod ehci-hcd
106 "ohci-hcd" or "uhci-hcd". In case of any trouble with the EHCI driver,
114 Log2 of default interrupt delay, in microframes. The default
120 debugging support, you'll see three files in the "sysfs" directory for
127 usb-storage doing disk I/O; watch the request queues!)
138 but they may want to check for "usb_device->speed == USB_SPEED_HIGH".
141 Also, some values in device descriptors (such as polling intervals for
146 transaction translators are in use; some drivers have been seen to behave
161 good to keep in mind that bulk transfers are always in 512 byte packets,
163 microframes fit in a USB 1.1 frame; a microframe is 1 msec/8 = 125 usec.
171 --------------------
194 default ehci-hcd driver uses the minimum latency, which means that if
196 it completed in less than 250 usec (depending on transfer size).
199 --------------------
201 To get even 20 MByte/sec transfer rates, Linux-USB device drivers will
202 need to keep the EHCI queue full. That means issuing large requests,
206 In typical situations, a usb_bulk_msg() loop writing out 4 KB chunks is
217 In the Linux 2.5 kernels, new usb_sg_*() api calls have been defined; they