netdev - Re: [PATCH] gianfar: Fix setup of RX time stamping

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Date:	Wed, 16 Jun 2010 14:40:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	cbouatmailru@...il.com
Cc:	Manfred.Rudigier@...cron.at, richard.cochran@...cron.at,
	netdev@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH] gianfar: Fix setup of RX time stamping

From: Anton Vorontsov <cbouatmailru@...il.com>
Date: Fri, 11 Jun 2010 16:20:23 +0400

> On Fri, Jun 11, 2010 at 01:49:05PM +0200, Manfred Rudigier wrote:
>> Previously the RCTRL_TS_ENABLE bit was set unconditionally. However, if
>> the RCTRL_TS_ENABLE is set without TMR_CTRL[TE], the driver does not work
>> properly on some boards (Anton had problems with the MPC8313ERDB and
>> MPC8568EMDS).
>> 
>> With this patch the bit will only be set if requested from user space
>> with the SIOCSHWTSTAMP ioctl command, meaning that time stamping is
>> disabled during normal operation. Users who are not interested in time
>> stamps will not experience problems with buggy CPU revisions or
>> performance drops any more.
>> 
>> The setting of TMR_CTRL[TE] is still up to the user. This is considered
>> safe because users wanting HW timestamps must initialize the eTSEC clock
>> first anyway, e.g. with the recently submitted PTP clock driver.
>> 
>> Signed-off-by: Manfred Rudigier <manfred.rudigier@...cron.at>
>> ---
> 
> Looks OK. I tested that it doesn't break anything, but I didn't
> test the timestamping functionality. So
> 
> Reviewed-by: Anton Vorontsov <cbouatmailru@...il.com>

Applied, thanks guys.
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