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| author | Ramneek Mehresh <ramneek.mehresh@freescale.com> | 2013-08-13 09:01:35 (GMT) |
|---|---|---|
| committer | Xie Xiaobo <xiaobo.xie@nxp.com> | 2017-12-12 07:32:41 (GMT) |
| commit | e1e457f4eb95c625e553082195155c339ec8aade (patch) | |
| tree | a2c34fe10395d7b65a4b0dbd7a1eb67bbb96679f /drivers/usb/host/ehci-hub.c | |
| parent | 97310c32bb83a5240cd527478159934d4aa5f78b (diff) | |
| download | linux-e1e457f4eb95c625e553082195155c339ec8aade.tar.xz | |
fsl/usb: Workarourd for USB erratum-A005697
As per USB specification, in the Suspend state, the status bit does
not change until the port is suspended. However, there may be a delay
in suspending a port if there is a transaction currently in progress
on the bus.
In the USBDR controller, the PORTSCx[SUSP] bit changes immediately when
the application sets it and not when the port is actually suspended
Workaround for this issue involves waiting for a minimum of 10ms to
allow the controller to go into SUSPEND state before proceeding ahead
Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
Change-Id: I8d20619d7d62afc12981c2f913c3d3ec735f7e64
Reviewed-on: http://git.am.freescale.net:8181/3996
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Aggrwal Poonam-B10812 <Poonam.Aggrwal@freescale.com>
Reviewed-by: Rivera Jose-B46482 <Jose.G.Rivera@freescale.com>
Diffstat (limited to 'drivers/usb/host/ehci-hub.c')
| -rw-r--r-- | drivers/usb/host/ehci-hub.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index d4a8ec5..6d82575 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -278,6 +278,8 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) { t2 |= PORT_SUSPEND; set_bit(port, &ehci->bus_suspended); + if (ehci_has_fsl_susp_errata(ehci)) + usleep_range(10000, 20000); } /* enable remote wakeup on all ports, if told to do so */ |