linux-kernel - Re: [PATCH V7 1/3] PCI: limit FLR wait time to 100ms maximum

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Message-ID: <51e4468b-1c58-b95a-f5a0-07dec5825483@codeaurora.org>
Date:   Wed, 2 Aug 2017 16:32:26 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        alex.williamson@...hat.com, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 1/3] PCI: limit FLR wait time to 100ms maximum

On 8/2/2017 4:27 PM, Bjorn Helgaas wrote:
> I haven't worked through all the details of what 6.6.2 says, but I
> think it uses 100ms in the context of the *minimum* time software must
> wait between initiating an FLR and initializing the function

Here is what spec says in 6.6.2

"After an FLR has been initiated by writing a 1b to the Initiate Function Level Reset bit,
the Function must complete the FLR within 100 ms."

I interpret this as maximum.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.