From: Tejun Heo <tj@kernel.org>
To: David Milburn <dmilburn@redhat.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: [PATCH] libata: sata_down_spd_limit should return if driver has not recorded sstatus speed
Date: Mon, 4 Dec 2017 13:57:36 -0800 [thread overview]
Message-ID: <20171204215736.GO2421075@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <1510697845-58071-1-git-send-email-dmilburn@redhat.com>
On Tue, Nov 14, 2017 at 04:17:25PM -0600, David Milburn wrote:
> During hotplug, it is possible for 6Gbps link speed to
> be limited all the way down to 1.5 Gbps which may lead
> to a slower link speed when drive is re-connected.
>
> This behavior has been seen on a Intel Lewisburg SATA
> controller (8086:a1d2) with HGST HUH728080ALE600 drive
> where SATA link speed was limited to 1.5 Gbps and
> when re-connected the link came up 3.0 Gbps.
>
> This patch was retested on above configuration and
> showed the hotplugged link to come back online at max
> speed (6Gbps). I did not see the downgrade when testing
> on Intel C600/X79, but retested patched linux-4.14-rc5
> kernel and didn't see any side effects from this
> change. Also, successfully retested hotplug on port
> multiplier 3Gbps link.
>
> Signed-off-by: David Milburn <dmilburn@redhat.com>
Applied to libata/for-4.15-fixes.
Thanks.
--
tejun
prev parent reply other threads:[~2017-12-04 21:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-14 22:17 [PATCH] libata: sata_down_spd_limit should return if driver has not recorded sstatus speed David Milburn
2017-11-27 19:19 ` Tejun Heo
2017-11-27 20:54 ` David Milburn
2017-12-04 21:57 ` Tejun Heo [this message]
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