ACK: [SRU][I/J/OEM-5.13/OEM-5.14][PATCH 0/1] Fix pci port lost when hotplug dock

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 12/13/21 4:52 AM, Aaron Ma wrote:
> BugLink: https://bugs.launchpad.net/bugs/1954646
> 
> [Impact]
> On Intel Maple Ridge, when hotplug TBT4 dock, PCIe bus show error
> "severity=Uncorrected (Non-Fatal)",
> and failed to probe.
> 
> [Fix]
> Re-enable PCIe port LTR after reset or hotplug, and probe it properly.
> 
> [Test]
> Verified on HW with TBT4 dock. it works fine.
> Also tested Tiger Lake-LP Thunderbolt 4, tbt4 dock works fine.
> Tested on AMD Cezanne, PCIe works fine, it doesn't support thunderbolt.
> 
> [Where problems could occur]
> PCI bus may break.
> 
> Mingchuang Qiao (1):
>    PCI: Re-enable Downstream Port LTR after reset or hotplug
> 
>   drivers/pci/pci.c   | 25 +++++++++++++++++++++++++
>   drivers/pci/pci.h   |  1 +
>   drivers/pci/probe.c | 18 +++++++++++++++---
>   3 files changed, 41 insertions(+), 3 deletions(-)
> 

-- 
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Tim Gardner
Canonical, Inc