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

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commit f96a4216e8 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@canonical.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2012-07-30 16:06:42 +01:00 committed by Greg Kroah-Hartman
parent 4e98953723
commit aeaab8a0fe
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/early/ehci-dbgp.c
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@ -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))