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| author | Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> | 2015-09-18 14:16:57 +0530 |
|---|---|---|
| committer | Alexey Kardashevskiy <aik@ozlabs.ru> | 2015-10-06 12:50:31 +1100 |
| commit | 2a37eb9a6a0c02622ee17c17b6de14362999737d (patch) | |
| tree | 3c65c1c6467911cd6c50fc037b6c707513773c65 /lib/libusb/usb-xhci.c | |
| parent | 41c2c5df4f582f2ffab0d5cfe34264f7eb9d0962 (diff) | |
| download | SLOF-2a37eb9a6a0c02622ee17c17b6de14362999737d.zip SLOF-2a37eb9a6a0c02622ee17c17b6de14362999737d.tar.gz SLOF-2a37eb9a6a0c02622ee17c17b6de14362999737d.tar.bz2 | |
usb-xhci: add delay in shutdown path
QEMU implementation of XHCI doesn't implement halt properly. There might
be ongoing activities and active DMAs, introduce 50ms delay during
shutdown path.
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Diffstat (limited to 'lib/libusb/usb-xhci.c')
| -rw-r--r-- | lib/libusb/usb-xhci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/libusb/usb-xhci.c b/lib/libusb/usb-xhci.c index aa8a066..c4ee387 100644 --- a/lib/libusb/usb-xhci.c +++ b/lib/libusb/usb-xhci.c @@ -870,6 +870,18 @@ static bool xhci_hcd_exit(struct xhci_hcd *xhcd) SLOF_dma_map_out(xhcd->dcbaap_dma, (void *)xhcd->dcbaap, XHCI_DCBAAP_MAX_SIZE); SLOF_dma_free((void *)xhcd->dcbaap, XHCI_DCBAAP_MAX_SIZE); } + + /* + * QEMU implementation of XHCI doesn't implement halt + * properly. It basically says that it's halted immediately + * but doesn't actually terminate ongoing activities and + * DMAs. This needs to be fixed in QEMU. + * + * For now, wait for 50ms grace time till qemu stops using + * this device. + */ + SLOF_msleep(50); + return true; } |