Xen devel - Dec 2006 - [PATCH]UHC should not generate interrupt when USB device returns NAK

This patch adds support for USB mouse/tablet status check and restricts
Universal Host Controller interrupt generating when receiving NAK in
interrupt transfer.

According to usb spec, USB mouse/tablet device returns NAK to host
controller if its status does not alter in interrupt transfer.
And UHC should leave a TD active when receiving NAK and execute this
incompleted TD in a subseqent frame. 
UHC only generates an interrupt on complete after the TD with ICO bit=1
is completed.

This patch obliges UHC & USB mouse/tablet to behave consistently with
spec.


Signed-off-by: Xinmei Huang <xinmei.huang@intel.com>

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

This patch adds support for USB mouse/tablet status check and restricts
Universal Host Controller interrupt generating when received NAK in
interrupt transfer.

According to usb spec, USB mouse/tablet device returns NAK to host
controller if its status does not alter in interrupt transfer.
And UHC should leave a TD active when receiving NAK and execute this
incompleted TD in a subseqent frame. 
UHC only generates an interrupt on complete after the TD with ICO bit=1
is completed.

This patch obliges UHC & USB mouse/tablet to behave consistently with
spec.


Signed-off-by: Xinmei Huang <xinmei.huang@intel.com>


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel