netdev - Re: [PATCH] net/macb: fix ISR clear-on-write behavior only for some SoC

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Date:	Tue, 04 Jun 2013 08:15:45 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
CC:	Hein Tibosch <hein_tibosch@...oo.es>, netdev@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	michal.simek@...inx.com, linux-kernel@...r.kernel.org,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	s.trumtrar@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
	Sören Brinkmann <soren.brinkmann@...inx.com>
Subject: Re: [PATCH] net/macb: fix ISR clear-on-write behavior only for some
 SoC

On 05/14/2013 07:52 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 08:58 Tue 14 May     , Hein Tibosch wrote:
>> On 5/14/2013 12:05 AM, Jean-Christophe PLAGNIOL-VILLARD wrote:
>>> On May 14, 2013, at 12:05 AM, Nicolas Ferre <nicolas.ferre@...el.com> wrote:
>>>
>>>> Commit 749a2b6 (net/macb: clear tx/rx completion flags in ISR)
>>>> introduces clear-on-write on ISR register. This behavior is not always
>>>> implemented when using Cadence MACB/GEM and is breaking other platforms.
>>>> We are using a new Device Tree compatibility string and a capability
>>>> property to actually activate this clear-on-write behavior on ISR.
>>>>
>>>> Reported-by: Hein Tibosch <hein_tibosch@...oo.es>
>>>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
>>> can we detect it via the IP?
>>
>> This was my first proposal, have it based on the value of MACB's
>> register 'MID' (offset 0x00fc, lower 16 bits).
>> On avr32 it reads: 0x0000010D, on Zynq it reports 0x00000119
>>
>> So for the moment, CAPS_ISR_CLEAR_ON_WRITE could be set if the revision
>> equals to 0x00000119?
> so no it will not work
> 
> as the gem on sama5 is 00020119
> 
> so version 0x119 too
> 
> nico 
> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>

Was this added to any queue or branch?
I would like to enable macb for zynq and not sure if "cdns,zynq-7000-gem"
compatible string goes to mainline.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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