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authorVincent Palatin <vpalatin@chromium.org>2011-12-05 14:52:22 -0800
committerRemy Bohmer <linux@bohmer.net>2011-12-11 14:42:57 +0100
commit5f4b4f2fed3ab8590c8c06b78642f8c1467acacf (patch)
treecca588fe85801f3edfefd897a8c67a5880c240bb
parent1af9f9633759a5f60e8b8bd4fcdb17a3d1aece5f (diff)
ehci: speed up initialization
According to EHCI specification v1.0, the controller should stabilize the power on a port at most 20 ms after the port power bit transition. So, we put this setting in the virtual descriptor corresponding field, (bPwrOn2PwrGood = 10 => 10 x 2ms = 20ms), this saves about 500ms at each controller initialization/enumeration. Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
-rw-r--r--drivers/usb/host/ehci-hcd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index b4c9db8464..1cee158b01 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -52,7 +52,7 @@ static struct descriptor {
0x29, /* bDescriptorType: hub descriptor */
2, /* bNrPorts -- runtime modified */
0, /* wHubCharacteristics */
- 0xff, /* bPwrOn2PwrGood */
+ 10, /* bPwrOn2PwrGood */
0, /* bHubCntrCurrent */
{}, /* Device removable */
{} /* at most 7 ports! XXX */