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

[Sathyanarayanan Kuppuswamy]

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 at linux.intel.com>
> Signed-off-by: Kai-Heng Feng<kai.heng.feng at canonical.com>

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