Re: Tracking down severe regression in 5.3-rc4/5.4 for TU116 - assistance needed

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On 2019-12-20 07:05, Mika Westerberg wrote:
> On Thu, Dec 19, 2019 at 03:38:10PM -0500, Ilia Mirkin wrote:
>> Let's add Mika and Rafael, as they were responsible for that commit.
>> Mika/Rafael - any ideas? The commit in question is
>>
>> 0617bdede5114a0002298b12cd0ca2b0cfd0395d
> 
> This seems to be
> 
>   Revert "PCI: Add missing link delays required by the PCIe spec"
> 
> Can you try v5.5-rcX without any additional changes? It should include
> the same fix done bit differently (trying to avoid breaking systems
> which caused us to revert the previous one):
> 
>   4827d63891b6 PCI/PM: Add pcie_wait_for_link_delay()
>   ad9001f2f411 PCI/PM: Add missing link delays required by the PCIe spec

Thanks Mika, it looks very promising.
kernel-core-5.5.0-0.rc2.git0.1.fc32.x86_64 boots up without the
aforementioned errors and I can operate normally. I will play more with
5.5 before closing the issue, but at the moment it seems to be fixed.

Before I started digging which commits introduced regression I tested my
system with (then) latest stable kernel-5.4.2-300, but I see your
changes are only in the 5.5 line :).

Big thanks Ilia for your help to pinpoint the problematic commit.

Marcin
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