linux-kernel - Re: [PATCH V2] PCI/ASPM: reconfigure ASPM following hotplug for POLICY

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Date:   Wed, 1 Mar 2017 12:58:08 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     "Patel, Mayurkumar" <mayurkumar.patel@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "timur@...eaurora.org" <timur@...eaurora.org>,
        "cov@...eaurora.org" <cov@...eaurora.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] PCI/ASPM: reconfigure ASPM following hotplug for
 POLICY_DEFAULT

Hi Bjorn,

On 2/28/2017 1:57 PM, Patel, Mayurkumar wrote:
>> I was trying to figure out when to use saved values vs. the values in
>> registers by looking at the enable_cnt.
>> enable_cnt is 0 during boot on my system.
> enable_cnt for the root port on my system is set to 1 for "root port" already without saving
> any ASPM related settings. 
> 
> 

What would be the best way to figure out when to save power-on values from
the registers?

-- 
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.