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    SubjectRE: [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems
    Date
    > -----Original Message-----
    > From: Keith Busch <kbusch@kernel.org>
    > Sent: Tuesday, July 30, 2019 2:20 PM
    > To: Kai-Heng Feng
    > Cc: Limonciello, Mario; rjw@rjwysocki.net; keith.busch@intel.com; hch@lst.de;
    > sagi@grimberg.me; linux-nvme@lists.infradead.org; linux-pm@vger.kernel.org;
    > linux-kernel@vger.kernel.org; rajatja@google.com
    > Subject: Re: [Regression] Commit "nvme/pci: Use host managed power state for
    > suspend" has problems
    >
    >
    > [EXTERNAL EMAIL]
    >
    > 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 think if a quirk goes in for Rafael's SSD it would have to be a quirk specific to this
    device and FW version per the findings on KH checking the same device with the
    older FW version.

    >
    > 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.

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