From: Christoph Hellwig <hch@lst.de>
To: Janne Grunau <j@jannau.net>
Cc: Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>,
Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
Alyssa Rosenzweig <alyssa@rosenzweig.io>,
Eric Curtin <ecurtin@redhat.com>,
asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] nvme-apple: Reset controller during shutdown
Date: Wed, 18 Jan 2023 06:24:50 +0100 [thread overview]
Message-ID: <20230118052450.GA24742@lst.de> (raw)
In-Reply-To: <20230114-apple-nvme-suspend-fixes-v6.2-v2-1-9157bf633dba@jannau.net>
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.
*/
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next parent reply other threads:[~2023-01-18 5:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230114-apple-nvme-suspend-fixes-v6.2-v2-0-9157bf633dba@jannau.net>
[not found] ` <20230114-apple-nvme-suspend-fixes-v6.2-v2-1-9157bf633dba@jannau.net>
2023-01-18 5:24 ` Christoph Hellwig [this message]
2023-01-19 6:14 ` [PATCH v2 1/2] nvme-apple: Reset controller during shutdown Christoph Hellwig
2023-01-19 7:58 ` Hector Martin "marcan"
2023-01-19 8:08 ` Christoph Hellwig
2023-01-19 8:12 ` Janne Grunau
2023-01-19 7:48 ` Janne Grunau
2023-01-18 5:25 ` [PATCH v2 0/2] nvme-apple: Fix suspend-resume regression Christoph Hellwig
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