summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-12-10 00:59:08 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-02 23:53:11 +0100
commit34fb562a436ca50e13c05e7584c9d62f151052bf (patch)
tree43638f312ee6f5de4157bb397a503bdf5952f35a
parentUSB: xhci: Refactor test for vendor-specific completion codes. (diff)
downloadlinux-34fb562a436ca50e13c05e7584c9d62f151052bf.tar.xz
linux-34fb562a436ca50e13c05e7584c9d62f151052bf.zip
USB: xhci: Refactor code to clear port change bits.
Refactor the code to clear the port change bits in the port status register. All port status change bits are write one to clear. Remove a redundant port status read that was supposed to unblock any posted writes. We read the port after the write to get the updated status for debugging, so the port read after that is unnecessary. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/host/xhci-hub.c47
1 files changed, 32 insertions, 15 deletions
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index eac5b53aa9e7..5850e8bc30de 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -129,6 +129,36 @@ static u32 xhci_port_state_to_neutral(u32 state)
return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
}
+static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
+ u16 wIndex, u32 __iomem *addr, u32 port_status)
+{
+ char *port_change_bit;
+ u32 status;
+
+ switch (wValue) {
+ case USB_PORT_FEAT_C_RESET:
+ status = PORT_RC;
+ port_change_bit = "reset";
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ status = PORT_CSC;
+ port_change_bit = "connect";
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ status = PORT_OCC;
+ port_change_bit = "over-current";
+ break;
+ default:
+ /* Should never happen */
+ return;
+ }
+ /* Change bits are all write 1 to clear */
+ xhci_writel(xhci, port_status | status, addr);
+ port_status = xhci_readl(xhci, addr);
+ xhci_dbg(xhci, "clear port %s change, actual port %d status = 0x%x\n",
+ port_change_bit, wIndex, port_status);
+}
+
int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
{
@@ -138,7 +168,6 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u32 temp, status;
int retval = 0;
u32 __iomem *addr;
- char *port_change_bit;
ports = HCS_MAX_PORTS(xhci->hcs_params1);
@@ -229,26 +258,14 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
temp = xhci_port_state_to_neutral(temp);
switch (wValue) {
case USB_PORT_FEAT_C_RESET:
- status = PORT_RC;
- port_change_bit = "reset";
- break;
case USB_PORT_FEAT_C_CONNECTION:
- status = PORT_CSC;
- port_change_bit = "connect";
- break;
case USB_PORT_FEAT_C_OVER_CURRENT:
- status = PORT_OCC;
- port_change_bit = "over-current";
+ xhci_clear_port_change_bit(xhci, wValue, wIndex,
+ addr, temp);
break;
default:
goto error;
}
- /* Change bits are all write 1 to clear */
- xhci_writel(xhci, temp | status, addr);
- temp = xhci_readl(xhci, addr);
- xhci_dbg(xhci, "clear port %s change, actual port %d status = 0x%x\n",
- port_change_bit, wIndex, temp);
- temp = xhci_readl(xhci, addr); /* unblock any posted writes */
break;
default:
error: