Commit f96a4216 authored Jul 30, 2012 by Colin Ian King Committed by Jason Wessel Jul 31, 2012

USB: echi-dbgp: increase the controller wait time to come out of halt.



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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

parent b10d22d6

drivers/usb/early/ehci-dbgp.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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))