linux-kernel - Re: [PATCH v2 0/1] platform/x86: asus-wmi: disable USB0 hub on ROG Ally before suspend

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Date:   Tue, 28 Nov 2023 15:21:10 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     hdegoede@...hat.com, "Luke D. Jones" <luke@...nes.dev>
Cc:     corentin.chary@...il.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/1] platform/x86: asus-wmi: disable USB0 hub on ROG
 Ally before suspend

On Mon, 27 Nov 2023 12:05:20 +1300, Luke D. Jones wrote:

> This is a fix for the ROG Ally not being able to use the N-Key device after a suspend/resume cycle.
> 
> The root of the issue is that ASUS changed the MCU firmware to dfisconnect the USB0 hub when the
> screen is switched off during the s2idle suspend path. I tried many many different tactics to try
> and get this s2idle part to work but it seems there are races between this and other subsystems.
> 
> What has so far been reliable and consistent is a manual call to the CSEE method that is called in
> ACPI by the Microsoft DSM screen off path followed by a short sleep in asus-wmi. The PM prepare
> hook looks to be the earliest possible place. A sleep that is too long ends up with USB subsystem
> registering a disconnect, and thus on resume the device paths change. Too short and it is unreliable.
> 
> [...]


Thank you for your contribution, it has been applied to my local
review-ilpo branch. Note it will show up in the public
platform-drivers-x86/review-ilpo branch only once I've pushed my
local branch there, which might take a while.

The list of commits applied:
[1/1] platform/x86: asus-wmi: disable USB0 hub on ROG Ally before suspend
      commit: e0894ff038d86f30614ec16ec26dacb88c8d2bd4

--
 i.