Date: Fri, 15 Oct 2010 00:46:46 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Subject: Possible solution for USB EHCI IRQ problems Message-ID: <201010150046.46203.hselasky@c2i.net>
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Hi, Anyone out there experiencing so-called EHCI-hangs, can try applying the following patch by hand: http://p4web.freebsd.org/@@184749?ac=10 ==== //depot/projects/usb/src/sys/dev/usb/controller/ehci.c#62 (text+ko) ==== @@ -1589,6 +1589,10 @@ usb_callout_reset(&sc->sc_tmo_pcd, hz, (void *)&ehci_pcd_enable, sc); } + /* if there was a doorbell, clear the doorbell busy flag */ + if (status & EHCI_STS_IAA) + sc->sc_flags &= ~EHCI_SCFLG_IAADBUSY; + status &= ~(EHCI_STS_INT | EHCI_STS_ERRINT | EHCI_STS_PCD | EHCI_STS_IAA); if (status != 0) { @@ -2313,7 +2317,7 @@ * XXX Certain nVidia chipsets choke when using the IAAD * feature too frequently. */ - if (sc->sc_flags & EHCI_SCFLG_IAADBUG) + if (sc->sc_flags & (EHCI_SCFLG_IAADBUG | EHCI_SCFLG_IAADBUSY)) return; /* XXX Performance quirk: Some Host Controllers have a too low @@ -2321,8 +2325,10 @@ * Controller after queueing the BULK transfer. */ temp = EOREAD4(sc, EHCI_USBCMD); - if (!(temp & EHCI_CMD_IAAD)) + if (!(temp & EHCI_CMD_IAAD)) { EOWRITE4(sc, EHCI_USBCMD, temp | EHCI_CMD_IAAD); + sc->sc_flags |= EHCI_SCFLG_IAADBUSY; + } } struct usb_pipe_methods ehci_device_bulk_methods = ==== //depot/projects/usb/src/sys/dev/usb/controller/ehci.h#20 (text+ko) ==== @@ -347,6 +347,7 @@ #define EHCI_SCFLG_TT 0x0020 /* transaction translator present */ #define EHCI_SCFLG_LOSTINTRBUG 0x0040 /* workaround for VIA / ATI chipsets */ #define EHCI_SCFLG_IAADBUG 0x0080 /* workaround for nVidia chipsets */ +#define EHCI_SCFLG_IAADBUSY 0x0100 /* doorbell is busy */ uint8_t sc_offs; /* offset to operational registers */ uint8_t sc_doorbell_disable; /* set on doorbell failure */ --HPS
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