netdev - Re: [PATCH resend] Renesas Ethernet AVB driver

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Date:	Tue, 14 Apr 2015 07:27:29 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, devicetree@...r.kernel.org,
	galak@...eaurora.org, netdev@...r.kernel.org,
	linux-sh@...r.kernel.org,
	Mitsuhiro Kimura <mitsuhiro.kimura.kc@...esas.com>,
	masaru.nagai.vx@...esas.com
Subject: Re: [PATCH resend] Renesas Ethernet AVB driver

On Mon, Apr 13, 2015 at 11:23:26PM +0300, Sergei Shtylyov wrote:
> >>This is a bit hacky.  Can't your driver make sure that the HW is ready?
> 
> >    Will look into this. Perhaps it's a remainder from when the PTP driver was
> >separate...
> 
>    No, we enter this mode upon closing the Ethernet device and when
> the ring DMA sizes are changed. Seems unavoidable...
> 
> >>>+    if (ravb_read(priv->ndev, CSR) & CSR_OPS_CONFIG)
> >>>+        return true;
> >>>+    else
> >>>+        return false;

It is surely avoidable.  The driver knows (or should know) whether or
not the hardware has been configured or not.

Thanks,
Richard
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