linux-kernel - Re: [PATCH] arm64: dts: mediatek: mt8186: Move wakeup to MTU3 to get working suspend

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Message-ID: <55c07154-8917-4273-9e91-39433474bbf2@collabora.com>
Date: Thu, 7 Nov 2024 12:04:09 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>, Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Cc: kernel@...labora.com, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, Wojciech Macek <wmacek@...gle.com>
Subject: Re: [PATCH] arm64: dts: mediatek: mt8186: Move wakeup to MTU3 to get
 working suspend

Il 06/11/24 22:01, Nícolas F. R. A. Prado ha scritto:
> The current DT has the wakeup-source and mediatek,syscon-wakeup
> properties in the XHCI nodes, which configures USB wakeup after powering
> down the XHCI hardware block. However, since the XHCI controller is
> behind an MTU3 (USB3 DRD controller), the MTU3 only gets powered down
> after USB wakeup has been configured, causing the system to detect a
> wakeup, and results in broken suspend support as the system resumes
> immediately.
> 
> Move the wakeup properties to the MTU3 nodes so that USB wakeup is only
> enabled after the MTU3 has powered down.
> 
> With this change in place, it is possible to suspend and resume, and
> also to wakeup through USB, as tested on the Google Steelix (Lenovo 300e
> Yoga Chromebook Gen 4).
> 
> Fixes: f6c3e61c5486 ("arm64: dts: mediatek: mt8186: Add MTU3 nodes")
> Reported-by: Wojciech Macek <wmacek@...gle.com>
> Suggested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>