linux-kernel - Re: [PATCH v2] ahci: disable DEVSLP for Intel Valleyview

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Message-ID: <20140424142658.GA14460@htj.dyndns.org>
Date:	Thu, 24 Apr 2014 10:26:58 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Subject: Re: [PATCH v2] ahci: disable DEVSLP for Intel Valleyview

On Tue, Apr 15, 2014 at 10:27:11PM -0700, Jacob Pan wrote:
> On Intel Valleyview SoC, SATA device sleep is not reliable. When
> DEVSLP is attempted on certain SSDs, port_devslp write would fail
> and result in malfunction of AHCI controller. AHCI controller may
> be not shown in PCI enumeration after reset. Complete power source
> removal may be required to recover from this failure. So we blacklist
> this device and override host device reported capabilities such that
> device LPM will only attempt slumber but not DEVSLP.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Acked-by: Dan Williams <dan.j.williams@...el.com>

Applied to libata/for-3.15-fixes.

Thanks.

-- 
tejun
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