linux-kernel - Re: [PATCH V2 3/7] PCI: make pci_flr_wait() generic and rename to pci_dev

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Date:   Tue, 2 Jan 2018 10:47:56 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        linux-arm-msm@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V2 3/7] PCI: make pci_flr_wait() generic and rename to
 pci_dev_wait()

On 12/13/2017 5:43 PM, Bjorn Helgaas wrote:
>> +
>> +	/*
>> +	 * Per PCIe r3.1, sec 6.6.2, a device must complete an FLR within
> I think this should reference the "Advanced Capabilities for
> Conventional PCI" ECN, shouldn't it?  The one I see is dated 13 April
> 2006, updated 27 July 2006, and I don't see a PCI spec that includes
> it.

I'll add reference to PCI spec as well. Any other comments on the series?

> 
>> +	 * 100ms, but may silently discard requests while the FLR is in
>> +	 * progress.  Wait 100ms before trying to access the device.
>> +	 */
>> +	msleep(100);
>> +
>> +	return pci_dev_wait(dev, "AF_FLR", PCIE_RESET_READY_POLL_MS);
> CRS is not applicable to conventional PCI.  The ECN mentions waiting
> 100ms.  I don't see anything about polling after that, but I guess it
> probably doesn't hurt anything.

ok, I'll keep it as it is.

> 
>>  }


-- 
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.