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path: root/drivers/usb/host
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-rw-r--r--drivers/usb/host/ehci-hub.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 27291f50265..71aeca019e8 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -647,9 +647,24 @@ static int ehci_hub_control (
status |= 1 << USB_PORT_FEAT_C_CONNECTION;
if (temp & PORT_PEC)
status |= 1 << USB_PORT_FEAT_C_ENABLE;
- if ((temp & PORT_OCC) && !ignore_oc)
+
+ if ((temp & PORT_OCC) && !ignore_oc){
status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
+ /*
+ * Hubs should disable port power on over-current.
+ * However, not all EHCI implementations do this
+ * automatically, even if they _do_ support per-port
+ * power switching; they're allowed to just limit the
+ * current. khubd will turn the power back on.
+ */
+ if (HCS_PPC (ehci->hcs_params)){
+ ehci_writel(ehci,
+ temp & ~(PORT_RWC_BITS | PORT_POWER),
+ status_reg);
+ }
+ }
+
/* whoever resumes must GetPortStatus to complete it!! */
if (temp & PORT_RESUME) {