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| author |   Changming Huang <jerry.huang@nxp.com> | 2016-11-29 13:45:38 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-12-05 15:13:58 +0100 |
| commit | 9d4b82706357f2eb23f45309227fc94d11eea255 (patch) | |
| tree | 6cfe74d0824423d75256a71587bec8d73e24b032 /drivers/usb/host/fsl-mph-dr-of.c | |
| parent | usb: hub: Wait for connection to be reestablished after port reset (diff) | |
| download | linux-dev-9d4b82706357f2eb23f45309227fc94d11eea255.tar.xz linux-dev-9d4b82706357f2eb23f45309227fc94d11eea255.zip | |
fsl/usb: Workarourd for USB erratum-A005697
The EHCI specification states the following in the SUSP bit description:
In the Suspend state, the port is sensitive to resume detection.
Note that the bit status does not change until the port is suspended and
that there may be a delay in suspending a port if there is a transaction
currently in progress on the USB.
However, in NXP USBDR controller, the PORTSCx[SUSP] bit changes immediately
when the application sets it and not when the port is actually suspended.
So the application must wait for at least 10 milliseconds after a port
indicates that it is suspended, to make sure this port has entered
suspended state before initiating this port resume using the Force Port
Resume bit. This bit is for NXP controller, not EHCI compatible.
Signed-off-by: Changming Huang <jerry.huang@nxp.com>
Signed-off-by: Ramneek Mehresh <ramneek.mehresh@nxp.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/fsl-mph-dr-of.c')
| -rw-r--r-- | drivers/usb/host/fsl-mph-dr-of.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/fsl-mph-dr-of.c b/drivers/usb/host/fsl-mph-dr-of.c index f07ccb25bc24..e90ddb530765 100644 --- a/drivers/usb/host/fsl-mph-dr-of.c +++ b/drivers/usb/host/fsl-mph-dr-of.c @@ -226,6 +226,8 @@ static int fsl_usb2_mph_dr_of_probe(struct platform_device *ofdev) of_property_read_bool(np, "fsl,usb-erratum-a007792"); pdata->has_fsl_erratum_a005275 = of_property_read_bool(np, "fsl,usb-erratum-a005275"); + pdata->has_fsl_erratum_a005697 = + of_property_read_bool(np, "fsl,usb_erratum-a005697"); /* * Determine whether phy_clk_valid needs to be checked |