netdev - Re: [PATCH 1/2] sh_eth: fix handling of no LINK signal

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Date:	Sun, 31 Mar 2013 19:44:42 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sergei.shtylyov@...entembedded.com
Cc:	netdev@...r.kernel.org, nobuhiro.iwamatsu.yj@...esas.com,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH 1/2] sh_eth: fix handling of no LINK signal

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Date: Sun, 31 Mar 2013 23:50:07 +0400

> The code handling the absent LINK signal (or the absent PSR register -- which
> reflects the state of this signal) is quite naive and has probably never really
> worked.  It's probably enough to say that this code is executed only on the LINK
> change interrupt (sic!) but even if we actually have the signal and choose to
> ignore it (it might be connected to PHY's link/activity LED output as on the
> Renesas BOCK-W board), sh_eth_adjust_link() on which this code relies to update
> 'mdp->link' gets executed later than the LINK change interrupt where it is
> checked, and so RX/TX never get enabled via ECMR register.
> 
> So, ignore the LINK changed interrupt iff LINK signal is absent (or just chosen
> not to be used) or PSR register is absent, and enable/disable RX/TX directly in
> sh_eth_adjust_link() in this case. 
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Applied.
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