linux-kernel - Re: [PATCH 1/2] PCI: Add a helper to check Power Resource Requirements

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Message-Id: <0379E973-651A-442C-AF74-51702388F55D@canonical.com>
Date:   Wed, 28 Aug 2019 00:58:28 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     bhelgaas@...gle.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/2] PCI: Add a helper to check Power Resource
 Requirements _PR3 existence

at 23:25, Takashi Iwai <tiwai@...e.de> wrote:

> On Tue, 27 Aug 2019 15:47:55 +0200,
> Kai-Heng Feng wrote:
>> A driver may want to know the existence of _PR3, to choose different
>> runtime suspend behavior. A user will be add in next patch.
>>
>> This is mostly the same as nouveau_pr3_present().
>
> Then it'd be nice to clean up the nouveau part, too?

nouveau_pr3_present() may call pci_d3cold_disable(), and my intention is to  
only check the presence of _PR3 (i.e. a dGPU) without touching anything.

Kai-Heng

>
>
> thanks,
>
> Takashi