linux-kernel - Re: [PATCH v3 0/3] ahci: add ports-implemented dt bindings

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Message-ID: <20160401144406.GS7822@mtj.duckdns.org>
Date:	Fri, 1 Apr 2016 10:44:06 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	linux-ide@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Andy Gross <andy.gross@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, jmaggard10@...il.com
Subject: Re: [PATCH v3 0/3] ahci: add ports-implemented dt bindings

On Fri, Apr 01, 2016 at 08:52:55AM +0100, Srinivas Kandagatla wrote:
> On some SOCs PORTS_IMPL register value is never programmed by the BIOS
> and left at zero value. Which means that no sata ports are available for
> software. AHCI driver used to cope up with this by fabricating the
> port_map if the PORTS_IMPL register is read zero, but recent patch [1]
> broke this workaround as zero value was valid for nvme disks.
> 
> This patch adds ports-implemented dt bindings as workaround for this issue
> in a way that DT can dictate the port_map incase where the SOCs does not
> program it already.

Applied all three patches to libata/for-4.6-fixes w/ stable cc'd.

Thanks.

-- 
tejun