On Mon, Nov 25, 2019 at 12:55:29PM -0500, Sasha Levin wrote:
> On Mon, Nov 18, 2019 at 04:23:54PM +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
> >
> > The patch below does not apply to the 4.4-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@xxxxxxxxxxxxxxx>.
> >
> > thanks,
> >
> > greg k-h
> >
> > ------------------ original commit in Linus's tree ------------------
> >
> > > From a9c3c4c597704b3a1a2b9bef990e7d8a881f6533 Mon Sep 17 00:00:00 2001
> > From: James Erwin <james.erwin@xxxxxxxxx>
> > Date: Fri, 1 Nov 2019 15:20:59 -0400
> > Subject: [PATCH] IB/hfi1: Ensure full Gen3 speed in a Gen4 system
> >
> > If an hfi1 card is inserted in a Gen4 systems, the driver will avoid the
> > gen3 speed bump and the card will operate at half speed.
> >
> > This is because the driver avoids the gen3 speed bump when the parent bus
> > speed isn't identical to gen3, 8.0GT/s. This is not compatible with gen4
> > and newer speeds.
> >
> > Fix by relaxing the test to explicitly look for the lower capability
> > speeds which inherently allows for gen4 and all future speeds.
> >
> > Fixes: 7724105686e7 ("IB/hfi1: add driver files")
> > Link: https://lore.kernel.org/r/20191101192059.106248.1699.stgit@xxxxxxxxxxxxxxxxxxxx
> > Cc: <stable@xxxxxxxxxxxxxxx>
> > Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
> > Reviewed-by: Kaike Wan <kaike.wan@xxxxxxxxx>
> > Signed-off-by: James Erwin <james.erwin@xxxxxxxxx>
> > Signed-off-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
> > Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
> > Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
>
> I've fixed it up and queued for 4.4 (missing bf400235f392
> ("staging/rdma/hfi1: Avoid using upstream component if it is not
> accessible") ).
Great, thanks for doing that.
greg k-h
