linux-kernel - Re: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset

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Message-ID: <20180420145521.GB30433@ziepe.ca>
Date:   Fri, 20 Apr 2018 08:55:21 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Sinan Kaya <okaya@...eaurora.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "sulrich@...eaurora.org" <sulrich@...eaurora.org>,
        "timur@...eaurora.org" <timur@...eaurora.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        "open list:HFI1 DRIVER" <linux-rdma@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset

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