openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

EHCI: add delay to bus_resume before accessing ports 

This patch (as870) adds a delay to ehci-hcd's bus_resume routine.
Apparently there are controllers and/or BIOSes out there which need
such a delay to get the ports back into their correct state.  This
fixes Bugzilla #8190.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-03-15 15:54:30 -04:00 committed by Greg Kroah-Hartman
parent eaafbc3a8a
commit e198a31489
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/usb/host/ehci-hub.c
View File

@ -136,6 +136,10 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
/* restore CMD_RUN, framelist size, and irq threshold */
ehci_writel(ehci, ehci->command, &ehci->regs->command);
/* Some controller/firmware combinations need a delay during which
* they set up the port statuses. See Bugzilla #8190. */
mdelay(8);
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {