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[174.3.196.123]) by smtp.gmail.com with ESMTPSA id e87sm12536986pfd.136.2018.04.20.07.55.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Apr 2018 07:55:22 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.86_2) (envelope-from ) id 1f9XRZ-000877-9N; Fri, 20 Apr 2018 08:55:21 -0600 Date: Fri, 20 Apr 2018 08:55:21 -0600 From: Jason Gunthorpe To: "Deucher, Alexander" Cc: Bjorn Helgaas , Sinan Kaya , Bjorn Helgaas , "linux-pci@vger.kernel.org" , "sulrich@codeaurora.org" , "timur@codeaurora.org" , "linux-arm-msm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Mike Marciniszyn , Dennis Dalessandro , Doug Ledford , "open list:HFI1 DRIVER" , open list Subject: Re: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset Message-ID: <20180420145521.GB30433@ziepe.ca> References: <1524167784-5911-1-git-send-email-okaya@codeaurora.org> <20180419202632.GE14063@ziepe.ca> <20180419214722.GO28657@bhelgaas-glaptop.roam.corp.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 19, 2018 at 10:11:27PM +0000, Deucher, Alexander wrote: > My understanding was that some platfoms only bring up the link in > gen 1 mode for compatibility reasons. TBH, I'm not that familiar > with how the links come up on different platforms. Then the platform firmware or platform's linux PCI root complex driver should perform speed negotiation. Something like that shouldn't be a driver problem to solve. The driver should only be involved if it has to alter the device (eg new device firmware or something).. Jason