linux-kernel - Re: [PATCH 2/3] PCI: dwc: qcom: Set suspend

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Message-ID: <20220518084356.GA6933@lst.de>
Date:   Wed, 18 May 2022 10:43:56 +0200
From:   Christoph Hellwig <hch@....de>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        bhelgaas@...gle.com, lorenzo.pieralisi@....com, kbusch@...nel.org,
        hch@....de, linux-nvme@...ts.infradead.org,
        linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, svarbanov@...sol.com,
        bjorn.andersson@...aro.org, axboe@...com,
        quic_vbadigan@...cinc.com, quic_krichai@...cinc.com,
        quic_nitirawa@...cinc.com, vidyas@...dia.com, sagi@...mberg.me
Subject: Re: [PATCH 2/3] PCI: dwc: qcom: Set suspend_poweroff flag for
 SC7280

On Mon, May 16, 2022 at 03:19:50PM -0500, Bjorn Helgaas wrote:
> No doubt "power ... will be taken off during system suspend" is true,
> but this isn't very informative.  Is this a property of SC7280?  A
> choice made by the SC7280 driver?  Why is this not applicable to other
> systems?

This is really braindamage inflicted by microsoft with the StorageD3
property on ACPI systems.  It is in general a really, really bad idea
as it saves a little power but massively wears out the flash.  It seems
like Chromebooks and DT just want to keep up with the Jones.

Which is a reminder that we should probably integrate the StorageD3
handling into this framework.