linux-kernel - [ 109/122] USB: echi-dbgp: increase the controller wait time to come out of halt.

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Date:	Tue,  7 Aug 2012 15:26:37 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Colin Ian King <colin.king@...onical.com>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: [ 109/122] USB: echi-dbgp: increase the controller wait time to come out of halt.

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit f96a4216e85050c0a9d41a41ecb0ae9d8e39b509 upstream.

The default 10 microsecond delay for the controller to come out of
halt in dbgp_ehci_startup is too short, so increase it to 1 millisecond.

This is based on emperical testing on various USB debug ports on
modern machines such as a Lenovo X220i and an Ivybridge development
platform that needed to wait ~450-950 microseconds.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/early/ehci-dbgp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/early/ehci-dbgp.c
+++ b/drivers/usb/early/ehci-dbgp.c
@@ -450,7 +450,7 @@ static int dbgp_ehci_startup(void)
 	writel(FLAG_CF, &ehci_regs->configured_flag);
 
 	/* Wait until the controller is no longer halted */
-	loop = 10;
+	loop = 1000;
 	do {
 		status = readl(&ehci_regs->status);
 		if (!(status & STS_HALT))


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