This says to me that we need 2 new (hub driver) functions
(or 2 variants of one new function):
usb_suspend_device(struct usb_device *dev);
usb_resume_device(struct usb_device *dev); /* or unsuspend ? */
that is similar to usb_reset_device() except for the
command that is sent to the device [new function
sends a SetPortFeature(USB_PORT_FEAT_SUSPEND) or
ClearPortFeature(USB_PORT_FEAT_SUSPEND) to the
device's parent (hub) port] and does not do the
usb_disconnect(&dev);
usb_hub_port_connect_change(parent, 1);
Does that sound right? Matt, would you use this?
~Randy
> -----Original Message-----
> From: Pat LaVarre [mailto:[EMAIL PROTECTED]]
> Sent: Friday, May 05, 2000 5:58 PM
> To: [EMAIL PROTECTED]
> Subject: [linux-usb] Usb Mass resets, distinguished
>
>
> > ... For some reason, detaching and re-attaching my [Usb Mass device]
> > doesn't always reset ... state. I sometimes have to eject the disk
> > and power cycle ...
>
> I hear the typical reset priorities for a Usb Mass device
> from least to greatest are:
>
> suspend (means power cycle if bus-powered)
> class-specific reset
> vendor-specific forms of reset
> port reset (means power cycle if bus-powered)
> power cycle
>
> That these resets are not equivalent is a fact of life,
> driven to more or less prominence by anything that looks like
> a cache: head position, self-powered RAM, speed-matching
> FIFOs, mode pages, defect management, user-level
> write-cacheing, you name it.
>
> That these resets are not equally effective is a mark of
> imperfection wherever that's true. To my eye, the demos most
> likely to provoke action are demos of forms of reset that can
> be demoed ineffective either in the latest idProduct for an
> idVendor or across more than one idProduct of an idVendor ...
> I wonder if anybody has such demos in place?
>
>
> x4402 Pat LaVarre of iOmega [EMAIL PROTECTED]
http://members.aol.com/ppaatt/
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
