linux-kernel - Re: [PATCH] nvme-pci: disable write zeroes for SK Hynix BC901

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Date:   Tue, 28 Nov 2023 13:57:18 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Jim.Lin" <jim.chihjung.lin@...il.com>
Cc:     kbusch@...nel.org, axboe@...nel.dk, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jim.lin@...iconmotion.com, cj.chen@...iconmotion.com,
        david.yeh@...iconmotion.com, hardaway.tseng@...com
Subject: Re: [PATCH] nvme-pci: disable write zeroes for SK Hynix BC901

On Tue, Nov 28, 2023 at 10:57:37AM +0800, Jim.Lin wrote:
> SK Hynix BC901 drive write zero will cause Chromebook takes more than 20 mins to switch to developer mode
> "disable write zeroes" can fix this issue and Sk Hynix has been verified.

Did you test this on an upstream kernel with

ommit 1b96f862ecccb3e6f950eba584bebf22955cecc5
Author: Christoph Hellwig <hch@....de>
Date:   Sun Oct 30 16:50:15 2022 +0100

    nvme: implement the DEAC bit for the Write Zeroes command

included?  Or in ther words, does this drive not implement DEAC
or does it not work properly?  What are the chances of actually
fixing the fimware to work properly?  Also WZSL limit does the
drive report?