linux-kernel - Re: [PATCH v2 1/2] nvme-apple: Reset controller during shutdown

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Date:   Wed, 18 Jan 2023 06:24:50 +0100
From:   Christoph Hellwig <hch@....de>
To:     Janne Grunau <j@...nau.net>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Eric Curtin <ecurtin@...hat.com>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] nvme-apple: Reset controller during shutdown

On Tue, Jan 17, 2023 at 07:25:00PM +0100, Janne Grunau wrote:
> +		/*
> +		 * Always reset the NVMe controller on shutdown. The reset is
> +		 * required to shutdown the co-processor cleanly.
> +		 */

Hmm.  This comment doesn't seem to match the discussion we had last
week.  Which would be:

		/*
		 * NVMe requires a reset before setting up a controller to
		 * ensure it is in a clean state.  For NVMe PCIe this is
		 * done in the setup path to be able to deal with controllers
		 * in any kind of state.  For for Apple devices, the firmware
		 * will not be available at that time and the reset will
		 * time out.  Thus reset after shutting the NVMe controller
		 * down and before shutting the firmware down.
		 */