From 5f4b4f2fed3ab8590c8c06b78642f8c1467acacf Mon Sep 17 00:00:00 2001 From: Vincent Palatin Date: Mon, 5 Dec 2011 14:52:22 -0800 Subject: [PATCH] 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 --- drivers/usb/host/ehci-hcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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 */ -- 2.25.1