linux-kernel - Re: [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems

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Message-ID: <20190730191934.GD13948@localhost.localdomain>
Date:   Tue, 30 Jul 2019 13:19:34 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     Mario.Limonciello@...l.com, rjw@...ysocki.net,
        keith.busch@...el.com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, rajatja@...gle.com
Subject: Re: [Regression] Commit "nvme/pci: Use host managed power state for
 suspend" has problems

On Wed, Jul 31, 2019 at 02:50:01AM +0800, Kai-Heng Feng wrote:
> 
> Just did a quick test, this patch regress SK Hynix BC501, the SoC stays at
> PC3 once the patch is applied.

Okay, I'm afraid device/platform quirks may be required unless there are
any other ideas out there.

I'm not a big fan of adding more params to this driver. Those are
global to the module, so that couldn't really handle a platform with
two different devices that want different behavior.