Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 21 Oct 2019 16:21:12 +0300
From:   Mika Westerberg <mika.westerberg@intel.com>
To:     Karol Herbst <kherbst@redhat.com>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lyude Paul <lyude@redhat.com>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Linux PCI <linux-pci@vger.kernel.org>,
        Linux PM <linux-pm@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        nouveau <nouveau@lists.freedesktop.org>
Subject: Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges
Message-ID: <20191021132112.GH2819@lahna.fi.intel.com>
References: <20191016144449.24646-1-kherbst@redhat.com>
 <20191021114017.GY2819@lahna.fi.intel.com>
 <CACO55tt2iGcySugTAb1khEYpiGoq6Os3upG5fGq+0PbE2gyyeQ@mail.gmail.com>
 <20191021120611.GB2819@lahna.fi.intel.com>
 <CACO55tvYEvPHwFLDmLOQ_BCiNw7ZRA7dun9P=KdLb4bvYTtrcg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CACO55tvYEvPHwFLDmLOQ_BCiNw7ZRA7dun9P=KdLb4bvYTtrcg@mail.gmail.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
User-Agent: Mutt/1.12.1 (2019-06-15)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Oct 21, 2019 at 03:02:23PM +0200, Karol Herbst wrote:
> > No, just block runtime PM from the device in nouveau driver.
> 
> but that's not what the patch does. It only skips the PCI PM reg
> write, but still let the ACPI method be invoked to put the device into
> D3cold

Oh, indeed it does. I did not realize that.

Which makes me wonder whether ACPI _OFF() expects the device to be in D0
for some reason.