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") ).
--
Thanks,
Sasha
