linux-kernel - Re: [PATCH] spi: bcm2835: do not unregister controller in shutdown handler

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Message-ID: <YVs5gT1rj9HiAW5p@sirena.org.uk>
Date:   Mon, 4 Oct 2021 18:27:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Lino Sanfilippo <LinoSanfilippo@....de>, rjui@...adcom.com,
        sbranden@...adcom.com, bcm-kernel-feedback-list@...adcom.com,
        nsaenz@...nel.org, linux-spi@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        p.rosenberger@...bus.com, linux-integrity@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] spi: bcm2835: do not unregister controller in shutdown
 handler

On Mon, Oct 04, 2021 at 02:13:01PM -0300, Jason Gunthorpe wrote:

> I'm kind of surprised a scheme like this didn't involve a FW call
> after Linux is done with the CPUs to quiet all the HW and let it
> sleep, I've built things that way before at least.

That's a *lot* of code to put in firmware if you can't physically power
most of the system down.

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