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Subject: Re: [PATCH v3] PCI: Reprogram bridge prefetch registers on resume
To:     Bjorn Helgaas <helgaas@kernel.org>
Cc:     Daniel Drake <drake@endlessm.com>,
        Linux PCI <linux-pci@vger.kernel.org>,
        Linux Upstreaming Team <linux@endlessm.com>,
        nouveau@lists.freedesktop.org, Linux PM <linux-pm@vger.kernel.org>,
        Peter Wu <peter@lekensteyn.nl>, kherbst@redhat.com,
        andy.shevchenko@linux.intel.com,
        "Wysocki, Rafael J" <rafael.j.wysocki@intel.com>,
        Keith Busch <keith.busch@intel.com>,
        Jon Derrick <jonathan.derrick@intel.com>,
        David Miller <davem@davemloft.net>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        netdev <netdev@vger.kernel.org>, nic_swsd@realtek.com,
        rchang@marvell.com, Linux Kernel <linux-kernel@vger.kernel.org>
References: <20180913033745.11178-1-drake@endlessm.com>
 <20180918213244.GE13616@bhelgaas-glaptop.roam.corp.google.com>
 <20180927205247.GA18434@bhelgaas-glaptop.roam.corp.google.com>
 <3f8efcd6-7cd2-b41a-d984-28c9e1740d6c@rockbox.org>
 <CAD8Lp47uL3DQTBiVTduO1+Cg8px4CDpv26qVJsgT+RJ4WZx9oA@mail.gmail.com>
 <7b0a5388-5b3a-a6e0-347f-94f87fc2e540@rockbox.org>
 <20181002200350.GC120535@bhelgaas-glaptop.roam.corp.google.com>
From:   Thomas Martitz <kugel@rockbox.org>
Organization: Rockbox
Message-ID: <0b3bc158-b836-7b44-ef09-7c124f479c58@rockbox.org>
Date:   Tue, 2 Oct 2018 23:26:35 +0200
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Am 02.10.18 um 22:03 schrieb Bjorn Helgaas:
> Hi Thomas,
> 
> On Mon, Oct 01, 2018 at 04:25:06PM +0200, Thomas Martitz wrote:
>> Am 01.10.18 um 06:57 schrieb Daniel Drake:
>>> On Sun, Sep 30, 2018 at 5:07 AM Thomas Martitz <kugel@rockbox.org> wrote:
>>>> The latest iteration does not work on my HP system. The GPU fails to
>>>> power up just like the unpatched kernel.
>>>
>>> That's weird, I would not expect a behaviour change in the latest
>>> patch. pci_restore_config_dword() has some debug messages, could you
>>> please make them visible and show logs again?
>>> Also remind us of the PCI device address of the parent bridge (lspci -vt)
>>
>> I'll follow up with more the requested information on bugzilla
>> (Link: https://bugzilla.kernel.org/show_bug.cgi?id=201069).
>>
>> On a quick re-check, it seems to depend on if I used the eGPU before
>> the initial suspend. If I run glxgears (with DRI_PRIME=1) before suspend it
>> seems fine.
> 
> Does the patch ([1]) make things *worse* compared to v4.19-rc5?
> 

No, certainly not. It does look like a different issue since resuming now
works at least if I used the eGPU in some way before suspend 
(DRI_PRIME=1 glxgears seems to be enough, I assume glxinfo would work as 
well).

Without the patch resuming the eGPU does not work whatsoever.

Please ship the patch. I'll hopefully sort this other issue out.

Best regards.