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

Michal Simek monstr at monstr.eu
Tue Jun 4 02:15:45 EDT 2013

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 at atmel.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 at yahoo.es>
>>>> Signed-off-by: Nicolas Ferre <nicolas.ferre at atmel.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 at jcrosoft.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.


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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