Re: [PATCH 1/6] usb: dwc3: Support Synopsys USB 3.1 IP

[Felipe Balbi <balbi@ti.com>]

[-- Attachment #1: Type: text/plain, Size: 1862 bytes --]

Hi,

On Fri, Oct 02, 2015 at 07:16:05PM +0000, John Youn wrote:
> >>>> From now, any check based on a revision (for STARS, workarounds, and
> >>>> new features) should take into consideration how it applies to both
> >>>> the 3.1/3.0 IP and make the check accordingly.
> >>>>
> >>>> Cc: <stable@vger.kernel.org> # v3.18+
> >>>
> >>> I really fail to how any of these patches in this series apply for stable. Care
> >>> to explain ?
> >>
> >> We have some prototyping products that are stuck on 3.18 stable
> >> kernels and will continue to ship with that for some time. We'd
> >> like to run the USB 3.1 controller on those platforms. Without
> >> these version id and version number updates dwc3 will not work
> >> with the USB 3.1 IP.
> >>
> >> I think the plan is to update those platforms to 4.2 eventually.
> >> So even then it will still need this patch.
> >>
> >> Also it will help out any customers stuck on earlier kernels.
> >>
> >> How would you advise we handle this, with the version id and
> >> number changes?
> > 
> > I have a feeling the answer to that will be that you will need to backport your
> > own patches :-( Or upgrade to the latest kernel around once your patches get
> > merged.
> > 
> > Would you care to explain why upgrading the kernel is so complex for this
> > prototyping solution ? I suppose you're not using HAPS as a PCIe card on a
> > common desktop PC, then ?
> 
> I don't know the technical reasons why. One platform is ARM based
> and using the 3.18 Linaro stable kernel. Another uses our ARC
> platform which is also on 3.18.
> 
> We're trying to avoid the situation where where we have to ship
> patches or maintain a separate kernel tree.
> 
> Do you have any objections to these going into stable?

I'm not the one you need to convince. That would be Greg :-)

--
balbi

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 819 bytes --]