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xhci: add support for suspend/resume

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The OS can ask the xhci controller to save and restore its
internal state, which is used by the OS when the system is
suspended and resumed.

This patch handles writes to the save + restore bits in the
command register.  Only thing it does is updating the
restore error bit in the status register to signal an error
on restore.  The guest OS should do a full reinitialization
after resume then.

This is the minimal patch which gets S3 going with xhci.
Implementing full save/restore support is TBD.

https://bugzilla.redhat.com/show_bug.cgi?id=1012365

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-11-08 11:43:20 +01:00
parent de9de157fb
commit f1f8bc218a
1 changed files with 8 additions and 0 deletions
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8
hw/usb/hcd-xhci.c
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@ -3025,6 +3025,14 @@ static void xhci_oper_write(void *ptr, hwaddr reg,
} else if (!(val & USBCMD_RS) && (xhci->usbcmd & USBCMD_RS)) {
xhci_stop(xhci);
}
if (val & USBCMD_CSS) {
/* save state */
xhci->usbsts &= ~USBSTS_SRE;
}
if (val & USBCMD_CRS) {
/* restore state */
xhci->usbsts |= USBSTS_SRE;
}
xhci->usbcmd = val & 0xc0f;
xhci_mfwrap_update(xhci);
if (val & USBCMD_HCRST) {