RE: [PATCH 3/7] usb: ehci: add freescale imx28 special write register method

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> 
> On Thu, Dec 05, 2013 at 03:20:51PM +0800, Peter Chen wrote:
> > According to Freescale imx28 Errata, "ENGR119653 USB: ARM to USB
> > register error issue", All USB register write operations must
> > use the ARM SWP instruction. So, we implement a special ehci_write
> > for imx28.
> >
> > Discussion for it at below:
> > http://marc.info/?l=linux-usb&m=137996395529294&w=2
> >
> > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> > Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> > Tested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> > ---
> >  drivers/usb/host/ehci.h |   18 +++++++++++++++++-
> >  1 files changed, 17 insertions(+), 1 deletions(-)
> 
> How is this a regression that needs to be fixed in 3.13-final?
> 

Without this patchset, there is lots of usb errors at i.mx28.
It was reported at: http://marc.info/?l=linux-usb&m=137996395529294&w=2.


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