linux-kernel - Re: [PATCH v2] nvme: Favor D3cold for suspend if NVMe device supports it

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Date:   Mon, 19 Apr 2021 14:57:46 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Alex Deucher <alexander.deucher@....com>,
        Prike Liang <Prike.Liang@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] nvme: Favor D3cold for suspend if NVMe device supports it

On Mon, Apr 19, 2021 at 2:50 PM Christoph Hellwig <hch@....de> wrote:
>
> On Fri, Apr 16, 2021 at 05:13:44PM +0800, Kai-Heng Feng wrote:
> > On AMD platforms that use s2idle, NVMe timeouts on s2idle resume,
> > because their SMU FW may cut off NVMe power during sleep.
>
> We're already have a discussion on a proper quirk for thse broken
> platforms on the linux-nvme list, please take part in that discussion.

Thanks. I didn't notice v5 was sent the to mailing list.
As of now, AMD folks are also reviewing this, and I believe this
approach is less quirky.

Kai-Heng