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

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Message-ID: <538CE4CA.4090301@cogentembedded.com>
Date:	Tue, 03 Jun 2014 00:55:38 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Miller <davem@...emloft.net>
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

On 06/03/2014 12:49 AM, David Miller wrote:

>>     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.

    I rather thought about not writing when the register is not implemented.
I'll probably look into this when I have time.

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

    I probably misspoke -- all the Gigabit controllers already have it set, 
it's just that some 100 MBbps ones have it set, but most don't.

WBR, Sergei

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