linux-kernel - Re: [REGRESSION] Suspend to RAM does not work anymore with k3-am62-ti-ipc-firmware.dtsi

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Message-ID: <e7aba180-5064-4b1e-a011-8e48c5cf3083@ti.com>
Date: Thu, 23 Oct 2025 13:55:39 +0530
From: Beleswar Prasad Padhi <b-padhi@...com>
To: Hiago De Franco <hiagofranco@...il.com>, Andrew Davis <afd@...com>,
        "Nagalla, Hari" <hnagalla@...com>
CC: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <u-kumar1@...com>,
        <jm@...com>, <d-gole@...com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        Robert Nelson <robertcnelson@...il.com>,
        João Paulo Gonçalves <joao.goncalves@...adex.com>,
        Emanuele Ghidoli <emanuele.ghidoli@...adex.com>,
        Francesco Dolcini
	<francesco.dolcini@...adex.com>,
        Matthias Schiffer
	<matthias.schiffer@...tq-group.com>,
        Logan Bristol
	<logan.bristol@...xas.edu>,
        Josua Mayer <josua@...id-run.com>, John Ma
	<jma@...tec.com>,
        Nathan Morrisson <nmorrisson@...tec.com>,
        Garrett Giordano
	<ggiordano@...tec.com>,
        Matt McKee <mmckee@...tec.com>, Wadim Egorov
	<w.egorov@...tec.de>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        "Stefan Eichenberger" <stefan.eichenberger@...adex.com>,
        Hiago De Franco
	<hiago.franco@...adex.com>,
        Diogo Ivo <diogo.ivo@...mens.com>,
        Li Hua Qian
	<huaqian.li@...mens.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Baocheng Su
	<baocheng.su@...mens.com>,
        Benedikt Niedermayr
	<benedikt.niedermayr@...mens.com>,
        <regressions@...ts.linux.dev>
Subject: Re: [REGRESSION] Suspend to RAM does not work anymore with
 k3-am62-ti-ipc-firmware.dtsi


On 21/10/25 14:33, Beleswar Prasad Padhi wrote:
> Hi Hiago,
>
> On 20/10/25 19:47, Hiago De Franco wrote:
>> Hello all,
>>
>> After commit 1d6161617c10 (“arm64: dts: ti: k3-am62-ti-ipc-firmware:
>> Refactor IPC cfg into new dtsi”), suspend-to-RAM stopped working on
>> AM62x.
>
> The above commit is only refactoring changes and should not
> cause any trouble. I think the commit you are interested in
> should be: a49f991e740f ("arm64: dts: ti: k3-am62-verdin:
> Add missing cfg for TI IPC Firmware").
>

<snip>

>
>> Do you have suggestions on how best to fix this in the driver, or should
>> we consider reverting the DTS change until suspend-to-RAM works again?
>
> List of suggestions/solutions in order of preference:
> 1. If no intention to enable IPC on rprocs:
>       Do _not_ include k3-am62-ti-ipc-firmware.dtsi
> 2. If intention is to enable IPC on rprocs:
>       Make sure rproc firmware is available in rootfs.
>       rproc would boot up and consume the mbox
>       msg, suspend would be successful. Tested this
>       on TI AM62x-sk with commit 1d6161617c, works
> 3. Add support in mbox driver to flush the pending
>     queues.


Posted a RFC version for #3:
https://lore.kernel.org/all/20251022102015.1345696-1-b-padhi@ti.com/

It still has open questions regarding scenarios with
FIFO firewalling and supporting existing OMAP SoCs
which could restore context upon resume.

Cc: Andrew, Hari

Thanks,
Beleswar