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Diffstat (limited to 'drivers/usb/host/uhci-hub.c')
| -rw-r--r-- | drivers/usb/host/uhci-hub.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c index 4c45ba8390f..ddb19cbf4b7 100644 --- a/drivers/usb/host/uhci-hub.c +++ b/drivers/usb/host/uhci-hub.c @@ -33,6 +33,22 @@ static __u8 root_hub_hub_des[] = /* status change bits: nonzero writes will clear */ #define RWC_BITS (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC) +/* A port that either is connected or has a changed-bit set will prevent + * us from AUTO_STOPPING. + */ +static int any_ports_active(struct uhci_hcd *uhci) +{ + int port; + + for (port = 0; port < uhci->rh_numports; ++port) { + if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & + (USBPORTSC_CCS | RWC_BITS)) || + test_bit(port, &uhci->port_c_suspend)) + return 1; + } + return 0; +} + static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf) { struct uhci_hcd *uhci = hcd_to_uhci(hcd); |