linux-kernel - Re: [PATCH 0/2] Fix some hotplug event issues

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Message-ID: <6283792d-3c91-0ec2-6f2b-edd647d0de67@amd.com>
Date:   Wed, 21 Sep 2022 10:48:17 -0500
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-usb@...r.kernel.org,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>, sanju.mehta@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Fix some hotplug event issues

On 9/21/2022 10:45, Greg KH wrote:
> On Wed, Sep 21, 2022 at 09:54:31AM -0500, Mario Limonciello wrote:
>> On AMD Pink Sardine it's been observed that if another CM has run before
>> the Linux CM that some registers may not match expectations which leads
>> to a non-functional hotplug for PCIe devices.
>>
>> Explicitly set these registers that have been observed to cause problems
>> with hotplug to the defaults of the USB4 spec.
>>
>> Mario Limonciello (2):
>>    thunderbolt: Explicitly reset plug events delay back to USB4 spec
>>      value
>>    thunderbolt: Explicitly enable lane adapter hotplug events at startup
>>
>>   drivers/thunderbolt/switch.c  |  5 +++++
>>   drivers/thunderbolt/tb.h      |  1 +
>>   drivers/thunderbolt/tb_regs.h |  1 +
>>   drivers/thunderbolt/usb4.c    | 19 +++++++++++++++++++
>>   4 files changed, 26 insertions(+)
> 
> Any specific reason these were not tagged for stable backports?
> 
> thanks,
> 
> greg k-h


No; no particular reason.  If Mika agrees with them, I think they are 
good candidates to include for stable too.  If I respin them, I'll tag 
accordingly.  If Mika picks them up as v1 I think he can add the tag 
when committing them.