linux-kernel - Re: [PATCH] cpsw: Fix interrupt storm among other things

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Date:	Wed, 30 Jan 2013 19:33:31 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
CC:	"Bedia, Vaibhav" <vaibhav.bedia@...com>,
	Richard Cochran <richardcochran@...il.com>,
	"Porter, Matt" <mporter@...com>,
	"Maupin, Chase" <chase.maupin@...com>,
	"Kridner, Jason" <jdk@...com>, Tony Lindgren <tony@...mide.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpsw: Fix interrupt storm among other things

On 1/30/2013 7:25 PM, Pantelis Antoniou wrote:
> Hi Mugunthan,
>
> On Jan 30, 2013, at 3:53 PM, Mugunthan V N wrote:
>
>> On 1/30/2013 7:21 PM, Pantelis Antoniou wrote:
>>> Hi Vaibhav,
>>>
>>> On Jan 30, 2013, at 3:47 PM, Bedia, Vaibhav wrote:
>>>
>>>> Hi Antoniou,
>>>>
>>>> On Wed, Jan 30, 2013 at 19:07:19, Pantelis Antoniou wrote:
>>>>> Hi Vaibhav,
>>>>>
>>>>> On Jan 30, 2013, at 3:29 PM, Bedia, Vaibhav wrote:
>>>>>
>>>>>> On Wed, Jan 30, 2013 at 18:14:30, Pantelis Antoniou wrote:
>>>>>>> Hi Vaibhav,
>>>>>>>
>>>>>>> On Jan 30, 2013, at 2:38 PM, Bedia, Vaibhav wrote:
>>>>>>>
>>>>>>>> On Wed, Jan 30, 2013 at 16:38:50, Pantelis Antoniou wrote:
>>>>>>>> [...]
>>>>>>>>> TBH I haven't found a simple way to print out the silicon revision number.
>>>>>>>>> Anyone on the list know a quick and dirty method?
>>>>>>>>>
>>>>>>>> You can dump the DEVICE_ID register @ 0x44e10600.
>>>>>>>> Bits 31:28 should be 0 for PG1.0 and 1 for PG2.0.
>>>>>>>>
>>>>>>> Thanks this works perfectly:
>>>>>>>
>>>>>>> original-bone:
>>>>>>> root@...glebone:~# devmem2 0x44e10600 w
>>>>>>> Read at address  0x44E10600 (0xb6ff4600): 0x0B94402E
>>>>>>>
>>>>>>> bone-black:
>>>>>>> root@...glebone:~# devmem2 0x44e10600 w
>>>>>>> Read at address  0x44E10600 (0xb6fcc600): 0x1B94402E
>>>>>>>
>>>>>> I just re-read the mail-chain and I am confused here.
>>>>>> So the patch in question is meant for Bone-A4 which has
>>>>>> PG1.0?
>>>>>>
>>>>> It is a general bug fix. The problem was discovered only on
>>>>> the bone black which has PG2.0 silicon. The driver has been
>>>>> tested and it works on the original bone with PG1.0 as well.
>>>>>
>>>> But Mugunthan mentioned that he doesn't see this on an EVM
>>>> with PG2.0 silicon... is there any board dependency here?
>>>>
>>> I don't know, but I doubt it. How about we wait for Mugunthan to
>>> send us what are the DEVICE_ID contents for his board.
>>>
>>>> Regards,
>>>> Vaibhav
>>> Regards
>>>
>>> -- Pantelis
>>>
>> This is the device ID which i have
>>
>> [root@...go /]# devmem 0x44e10600
>> 0x1B94402E
>>
> No clue what's the difference of the black with the EVM, and why this happens.
> The fix is valid anyway.
>
>> Regards
>> Mugunthan V N
> Regards
>
> -- Pantelis
>
I will try to run overnight ethernet test in EVM and will update by 
tomorrow.

Regards
Mugunthan V N
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