netdev - Re: macb: zynq: why is SG disabled?

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Date:	Thu, 2 Jul 2015 09:48:34 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>,
	"Cyrille Pitchen" <cyrille.pitchen@...el.com>,
	Nicolae Rosia <nicolae.rosia@...tsign.ro>,
	Michal Simek <michals@...inx.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: macb: zynq: why is SG disabled?

Le 02/07/2015 04:33, Punnaiah Choudary Kalluri a écrit :
> Hi Nicolae and Cyrille,
> 
>    SG feature was not tested for Zynq using macb driver but tested it using the
>  emacps Driver in Xilinx tree (this driver is deprecated recently)
> 
> We will test and enable this feature in driver for Zynq.

Ok, fine: we will be glad to merge patches that would enable this
feature on Zynq.

Bye,


>> -----Original Message-----
>> From: Cyrille Pitchen [mailto:cyrille.pitchen@...el.com]
>> Sent: Wednesday, July 01, 2015 10:34 PM
>> To: Nicolae Rosia; Michal Simek; Punnaiah Choudary Kalluri;
>> netdev@...r.kernel.org; Nicolas Ferre; linux-arm-kernel@...ts.infradead.org
>> Subject: Re: macb: zynq: why is SG disabled?
>>
>> Le 01/07/2015 17:14, Nicolae Rosia a écrit :
>>> Hello,
>>>
>>> After reading the GEM part of Zynq7000 Technical Reference Manual [0], I
>> think that SG should be supported.
>>> Is there a reason why SG is disabled in macb for Zynq?
>>>
>>> Best regards,
>>> Nicolae Rosia
>>
>> Hi Nicolae,
>>
>> when the scatter-gather patch was introduced, the feature was enabled only
>> on tested boards to avoid regressions on other boards.
>> So SG is enabled on sama5d4x and sama5d2x SoCs. SG is disabled on purpose
>> on sama5d3x.
>>
>> For Zynq, I think the feature is still disabled just because it has never been
>> tested.
>>
>> Best regards,
>>
>> Cyrille
> 


-- 
Nicolas Ferre
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