redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
hifive-unleashed-5.1
Colin Ian King 2012-07-30 16:06:42 +01:00 committed by Jason Wessel
parent b10d22d6e8
commit f96a4216e8
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/early/ehci-dbgp.c
View File

@ -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))