linux-kernel - Re: [PATCH v2] PCI: Avoid putting some root ports into D3 on some Ryzen chips

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Message-ID: <7a9353d3-b9db-4499-a054-c7050bc7b4d5@tuxedocomputers.com>
Date: Tue, 17 Dec 2024 16:58:39 +0100
From: Werner Sembach <wse@...edocomputers.com>
To: Mario Limonciello <mario.limonciello@....com>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: ggo@...edocomputers.com, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PCI: Avoid putting some root ports into D3 on some
 Ryzen chips

Am 17.12.24 um 15:11 schrieb Mario Limonciello:
> On 12/17/2024 08:07, Werner Sembach wrote:
>
>>> '''
>>> Platform may hang resuming.  Upgrade your firmware or add pcie_port_pm=off 
>>> to kernel command line if you have problems
>>> '''
>> Yes, full log attached (kernel 6.13-rc3 one time without sudo one time with 
>> sudo)
>
> Yes; I see it in your log.
>
>>> "quirk: disabling D3cold for suspend"
>> On the fixed BIOS I see that line. On the unfixed BIOS it aborts the 
>> functions at "if (pm_suspend_target_state == PM_SUSPEND_ON)". Skipping the 
>> check on the unfixed BIOS it still hangs on resume.
>>>
>>> I'm /suspecting/ you do see it, but you're having problems with another root 
>>> port.
>>>
>>> I mentioned this in my previous iterations of patches that eventually landed 
>>> on that quirk, but Windows and Linux handle root ports differently at 
>>> suspend time and that could be why it's exposing your BIOS bug.
>>>
>>> If you can please narrow down which root ports actually need the quirk for 
>>> your side (feel free to do a similar style to 7d08f21f8c630) I think we 
>>> could land on something more narrow and upstreamable.
>>>
>>> At a minimum what you're doing today is covering both Rembrandt and Phoenix 
>>> and it should only apply to Phoenix.
>>
>> I also try to find out how many devices where actually shipped with this very 
>> first BIOS version.
>
> OK.

Ok found out that the initial bios actually works, then there is one in between 
bios where it doesn't and the next one it works again.

So i need to find out if the the in between bios was actually shipped, if not, 
this issue is actually void.