From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Ferre <nicolas.ferre@atmel.com>
Subject: Re: macb: zynq: why is SG disabled?
Date: Thu, 2 Jul 2015 09:48:34 +0200
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To: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@xilinx.com>,
	"Cyrille Pitchen" <cyrille.pitchen@atmel.com>,
	Nicolae Rosia <nicolae.rosia@certsign.ro>,
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Le 02/07/2015 04:33, Punnaiah Choudary Kalluri a =E9crit :
> Hi Nicolae and Cyrille,
>=20
>    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)
>=20
> 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@atmel.com]
>> Sent: Wednesday, July 01, 2015 10:34 PM
>> To: Nicolae Rosia; Michal Simek; Punnaiah Choudary Kalluri;
>> netdev@vger.kernel.org; Nicolas Ferre; linux-arm-kernel@lists.infrad=
ead.org
>> Subject: Re: macb: zynq: why is SG disabled?
>>
>> Le 01/07/2015 17:14, Nicolae Rosia a =E9crit :
>>> 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 enable=
d only
>> on tested boards to avoid regressions on other boards.
>> So SG is enabled on sama5d4x and sama5d2x SoCs. SG is disabled on pu=
rpose
>> on sama5d3x.
>>
>> For Zynq, I think the feature is still disabled just because it has =
never been
>> tested.
>>
>> Best regards,
>>
>> Cyrille
>=20


--=20
Nicolas Ferre