linux-kernel - Re: [PATCH 4/5] sata, highbank: set tx

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Message-ID: <51F2C220.5040407@gmail.com>
Date:	Fri, 26 Jul 2013 13:38:24 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Mark Rutland <mark.rutland@....com>
CC:	Mark Langsdorf <mark.langsdorf@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"tj@...nel.org" <tj@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>
Subject: Re: [PATCH 4/5] sata, highbank: set tx_atten override bits

On 07/26/2013 11:22 AM, Mark Rutland wrote:
> On Fri, Jul 26, 2013 at 04:11:57PM +0100, Mark Langsdorf wrote:
>> Some board designs do not drive the SATA transmit lines within the
>> specification. The ECME can provide override settings, on a per board
>> basis, to bring the transmit lines within spec. Read those settings
>> from the DTB and program them in.
> 
> How variable is the use of this property going to be? Would it instead
> be possible to decide that this was necessary, and choose the
> appropriate values based on a compatible property?

It is based on compliance testing of the particular board design. Basing
on a compatible property would not work in this case.

Rob

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