linux-kernel - Re: [PATCH v12 3/4] PHY: add APM X-Gene SoC 15Gbps Multi-purpose PHY driver

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Date:	Thu, 27 Feb 2014 13:02:59 -0600
From:	Felipe Balbi <balbi@...com>
To:	Loc Ho <lho@....com>
CC:	<kishon@...com>, <tj@...nel.org>, <olof@...om.net>,
	<arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <ddutile@...hat.com>,
	<jcm@...hat.com>, <patches@....com>, Tuan Phan <tphan@....com>,
	Suman Tripathi <stripathi@....com>
Subject: Re: [PATCH v12 3/4] PHY: add APM X-Gene SoC 15Gbps Multi-purpose PHY
 driver

Hi,

On Thu, Feb 27, 2014 at 11:14:07AM -0700, Loc Ho wrote:
> +/*
> + * This function is used to configure the PHY to operation as either SATA Gen1
> + * or Gen2 speed.
> + */
> +static void xgene_phy_sata_force_gen(struct xgene_phy_ctx *ctx,
> +				     int lane, int gen)

why do you need to *force* the generation ? Is this because of some
silicon errata ? It almost seems like this should be done through link
negotiation between both link partners.

-- 
balbi

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