linux-kernel - Query related to shutting down NVMe during system suspend

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Message-ID: <65b836cd-8d5d-b9c2-eb8f-2ee3ef46112b@nvidia.com>
Date:   Tue, 1 Feb 2022 21:52:28 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <rafael.j.wysocki@...el.com>, <keith.busch@...el.com>, <hch@....de>
CC:     <bhelgaas@...gle.com>, <mmaddireddy@...dia.com>,
        <kthota@...dia.com>, <sagar.tv@...il.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Query related to shutting down NVMe during system suspend

Hi Rafael & Christoph,
My query is regarding the comment and the code that follows after it at
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/nvme/host/pci.c?h=v5.17-rc2#n3243
What I understood from it is that, there is an underlying assumption
that the power to the devices is not removed during the suspend call.
In the case of device-tree based platforms like Tegra194, power is
indeed removed to the devices during suspend-resume process. Hence, the
NVMe devices need to be taken through the shutdown path irrespective of
whether the ASPM states are enabled or not.
I would like to hear from you the best method to follow to achieve this.

Thanks & Regards,
Vidya Sagar