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[Xen-devel] [PATCH]UHC should not generate interrupt when USB device ret
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| Subject: | [Xen-devel] [PATCH]UHC should not generate interrupt when USB device returns NAK |
| From: | "Huang, Xinmei" <xinmei.huang@xxxxxxxxx> |
| Date: | Tue, 5 Dec 2006 12:48:34 +0800 |
| Delivery-date: | Mon, 04 Dec 2006 20:50:37 -0800 |
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| Thread-topic: | [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@xxxxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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