netdev - Re: [PATCH v2] sh_eth: use RNC mode for R8A7790/R87791

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Message-Id: <20140602.134915.1162774321657125992.davem@davemloft.net>
Date:	Mon, 02 Jun 2014 13:49:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	sergei.shtylyov@...entembedded.com
Cc:	ben.dooks@...ethink.co.uk, linux-kernel@...ethink.co.uk,
	netdev@...r.kernel.org, nobuhiro.iwamatsu.yj@...esas.com,
	magnus.damn@...nsource.se, horms@...ge.net.au,
	yoshihiro.shimoda.uh@...esas.com, cm-hiep@...so.co.jp
Subject: Re: [PATCH v2] sh_eth: use RNC mode for R8A7790/R87791

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Date: Mon, 02 Jun 2014 23:33:47 +0400

>    Looks like the early SH2/3 SoCs didn't implement the whole register.
> Despite that, sh_eth_dev_init() always writes to this register... :-/
> So far, the RMCR.RNC bit was mostly set for the Gigabit-capable
> controllers, however that rule wasn't strictly followed. Well, this
> driver is still a mess, and it's hard to deal with it without the
> necessary documentation.

Why don't we therefore:

1) Skip the register write if the per-chip value is zero.

2) Add the RNC bit to all of the gigabit capable controllers.
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