diff options
| author | Gerd Hoffmann <kraxel@redhat.com> | 2013-11-08 11:43:20 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2013-11-12 09:29:33 +0100 |
| commit | 7ce2bc5345772a22c675f510234a9b9b2c83c329 (patch) | |
| tree | a412fb7b5bee5962e06c83705c96968104941a18 | |
| parent | ffcc3fa2de9501331732a285a3d0d169c017d65a (diff) | |
usb: handle suspend in xhci
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>
| -rw-r--r-- | hw/usb/hcd-xhci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 835f65ed8..d84d51031 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -3016,6 +3016,14 @@ 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) { |