linux-kernel - Re: [PATCH] PCI: pciehp: Do not turn off slot if presence comes up after link

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Date:   Thu, 14 Feb 2019 19:26:28 +0000
From:   <Alex_Gagniuc@...lteam.com>
To:     <lukas@...ner.de>
Cc:     <mr.nuke.me@...il.com>, <bhelgaas@...gle.com>,
        <Austin.Bolen@...l.com>, <keith.busch@...el.com>,
        <Shyam.Iyer@...l.com>, <gustavo@...eddedor.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: pciehp: Do not turn off slot if presence comes up
 after link

On 2/14/19 1:01 AM, Lukas Wunner wrote:
> On Wed, Feb 13, 2019 at 06:55:46PM +0000, Alex_Gagniuc@...lteam.com wrote:
>> On 2/13/19 2:36 AM, Lukas Wunner wrote:
>>>> (*) A bit hypothetical: There is no hardware yet implementing the ECN.
>>>
>>> Hm, this contradicts Austin Bolen's e-mail of Jan 25 that "Yes, this
>>> platform disables in-band presence" (when asked whether your host
>>> controller already adheres to the ECN).
>>
>> Both statements are true. The hardware does indeed disable in-band
>> presence, in a rudimentary way that is not compliant with the ECN -- it
>> doesn't implement the bits required by the ECN.
> 
> Ugh, can a BIOS update make those machines compliant to the ECN

No, that is not possible, I'm told.

> or do we need a quirk specifically for them?

We might have to.

> It should match the spec, which I have no access to.

I am as irritated as you that the spec is not readily available for 
public viewing.

Cheers,
Alex