linux-kernel - RE: [PATCH] nvme/pci: Use host managed power state for suspend

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Date:   Mon, 13 May 2019 14:24:41 +0000
From:   <Mario.Limonciello@...l.com>
To:     <keith.busch@...el.com>, <hch@....de>, <sagi@...mberg.me>,
        <linux-nvme@...ts.infradead.org>
CC:     <rafael@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <kai.heng.feng@...onical.com>
Subject: RE: [PATCH] nvme/pci: Use host managed power state for suspend

> > Cc: Mario Limonciello <Mario.Limonciello@...l.com>
> > Cc: Kai Heng Feng <kai.heng.feng@...onical.com>
> > Signed-off-by: Keith Busch <keith.busch@...el.com>
> > ---
> > Disclaimer: I've tested only on emulation faking support for the feature.
> 
> Thanks for sharing.  I'll arrange some testing with this with storage partners early
> next week.
> 

I've received the result that from one of my partners this patch doesn't work properly
and the platform doesn't go into a lower power state.  (The patch submitted by KH/me
did work on said system to get it into a lower power state for them).

This was not a disk with HMB, but with regard to the HMB I believe it needs to be
removed during s0ix so that there isn't any mistake that SSD thinks it can access HMB
memory in s0ix.