linux-kernel - Re: [PATCH v4 2/2] PCI/DPC: Disable DPC service when link is in L2/L3 ready, L2 and L3 state

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Message-ID: <0d4e8764-b1ae-ae59-06ff-d5b705891da4@linux.intel.com>
Date:   Sun, 17 Apr 2022 19:41:00 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>, bhelgaas@...gle.com
Cc:     mika.westerberg@...ux.intel.com, koba.ko@...onical.com,
        baolu.lu@...ux.intel.com, Russell Currey <ruscur@...sell.cc>,
        Oliver O'Halloran <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] PCI/DPC: Disable DPC service when link is in L2/L3
 ready, L2 and L3 state



On 4/8/22 8:31 AM, Kai-Heng Feng wrote:
> On Intel Alder Lake platforms, Thunderbolt entering D3cold can cause
> some errors reported by AER:
> [   30.100211] pcieport 0000:00:1d.0: AER: Uncorrected (Non-Fatal) error received: 0000:00:1d.0
> [   30.100251] pcieport 0000:00:1d.0: PCIe Bus Error: severity=Uncorrected (Non-Fatal), type=Transaction Layer, (Requester ID)
> [   30.100256] pcieport 0000:00:1d.0:   device [8086:7ab0] error status/mask=00100000/00004000
> [   30.100262] pcieport 0000:00:1d.0:    [20] UnsupReq               (First)
> [   30.100267] pcieport 0000:00:1d.0: AER:   TLP Header: 34000000 08000052 00000000 00000000
> [   30.100372] thunderbolt 0000:0a:00.0: AER: can't recover (no error_detected callback)
> [   30.100401] xhci_hcd 0000:3e:00.0: AER: can't recover (no error_detected callback)
> [   30.100427] pcieport 0000:00:1d.0: AER: device recovery failed
> 
> Since AER is disabled in previous patch for a Link in L2/L3 Ready, L2
> and L3, also disable DPC here as DPC depends on AER to work.
> 
> Bugzilla:https://bugzilla.kernel.org/show_bug.cgi?id=215453
> Reviewed-by: Mika Westerberg<mika.westerberg@...ux.intel.com>
> Signed-off-by: Kai-Heng Feng<kai.heng.feng@...onical.com>

Reviewed-by: Kuppuswamy Sathyanarayanan 
<sathyanarayanan.kuppuswamy@...ux.intel.com>
-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer