linux-kernel - Re: [PATCH 15/15] hisi_sas: send three identify before phy up

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Message-ID: <6aff1701-555e-7ebd-e503-73659c68702e@suse.de>
Date:   Wed, 14 Sep 2016 14:52:08 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linuxarm@...wei.com, zhangfei.gao@...aro.org, xuwei5@...ilicon.com,
        john.garry2@...l.dcu.ie, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        NengLong Zhao <zhaonenglong@...ilicon.com>
Subject: Re: [PATCH 15/15] hisi_sas: send three identify before phy up

On 09/06/2016 05:36 PM, John Garry wrote:
> When the v2 hw is attached with many disks through
> an expander, there may be OOB reset resulting in a PHY
> going down after the speed is negotiated (very low
> probability).
> 
> This issue is resolved by modifying the link control
> registers to send three identify frames before the PHY
> is ready (according to 6.10.3.3.2 in SAS 3.0 spec) and
> close ready when the PHY is down.
> 
> Signed-off-by: NengLong Zhao <zhaonenglong@...ilicon.com>
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 20 ++++++++++++++++----
>  1 file changed, 16 insertions(+), 4 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)