linux-kernel - Re: [Patch v3 0/4] Add support for downstream port reset(DPR)

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Message-ID: <cc53d5e2-b9ef-2c48-6c94-0b279f11263f@amd.com>
Date: Wed, 10 Jan 2024 20:59:51 +0530
From: Sanath S <sanaths2@....com>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Sanath S <Sanath.S@....com>
Cc: mario.limonciello@....com, andreas.noever@...il.com,
 michael.jamet@...el.com, YehezkelShB@...il.com, linux-usb@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [Patch v3 0/4] Add support for downstream port reset(DPR)


On 1/10/2024 8:01 PM, Mika Westerberg wrote:
> Hi,
>
> On Sat, Jan 06, 2024 at 10:27:19PM +0530, Sanath S wrote:
>> Tunnels created by boot firmware results in incorrect PCI resource
>> allocation, which results in failure of extending daisy chain.
>> This series aims to resolve inconsistent tunnels or paths created
>> by boot firmware.
>>
>> Before:
>>             +-03.1-[04-62]----00.0-[05-07]--+-02.0-[06]----00.0
>>             |                               \-04.0-[07]--
>> After:
>>             +-03.1-[04-62]----00.0-[05-62]--+-02.0-[06]----00.0
>>             |                               \-04.0-[07-62]--
>>
>> This series also aligns with windows behaviour of performing a teardown
>> of tunnels and resetting the downstream ports using DPR during the init
>> sequence.
>>
>> Changes since V3:
>>   - Remove discover_tunnel() api before resetting DPR.
>>   - Add lane and protocol adapters reset in tb_switch_reset()
>>   - Addition of tb_lc_reset_port() for TBT1, TBT2 and TBT3 routers.
>>   - Addition of tb_path_deactivate_hop() api to help suppport path
>>     reset of given hop index.
>>   - Addition on new patch to store and indicate host router reset
>>     status of USB4 v2
>>
>> Changes since V2:
>>   - Perform DPR only for USB4 routers.
>>   - Update kernel-doc and return value to -EOPNOTSUPP.
>>   - Limit delay range to 10-15ms.
>>
>> Sanath S (4):
>>    thunderbolt: Introduce usb4_port_reset() and tb_lc_reset_port()
>>    thunderbolt: Extend tb_switch_reset() to support lane and protocol
>>      adapter reset
>>    thunderbolt: Store host router reset status in nhi_probe()
>>    thunderbolt: Teardown tunnels and reset downstream ports created by
>>      boot firmware
> Thanks for the series!
>
> I will give this a try on our end too to make sure there are no issues.
> If things look good I will queue these for v6.9 after v6.8-rc1 is
> released.

Thanks Mika :)
Looking forward for results at your end.